Weather StoryAlmanac, microseasons, and the day's weather story.

Chattanooga, Tennessee Weather

Dusk arrives one minute earlier each night. Day 43 of summer. Read this microseason across nine climate regions →

Chattanooga weather forecast — hour by hour, 7-day outlook, NOAA radar

Chattanooga, TN
Sunday, August 2 at 10:58 AM
77
°
Overcast
Feels like
83°
Humidity
86%
Wind
7 mph
Sunrise
2:51 AM
Sunset
4:43 PM
Chattanooga, TN
Hour by hour · 24h
24-Hour ForecastChattanooga, TN: 24-hour forecast. Temperatures range from 69 to 83 degrees Fahrenheit.
L 69°H 83°
Chattanooga, TN
7-day forecast
  1. Today
    Aug 2
    Light Drizzle
    57%
    0.01″
    83°72°—
  2. Monday
    Aug 3
    Overcast
    21%
    —
    82°69°-1°
  3. Tuesday
    Aug 4
    T-storm w/ Hail
    60%
    —
    89°68°+7°
  4. Wednesday
    Aug 5
    Thunderstorm
    61%
    —
    87°69°-2°
  5. Thursday
    Aug 6
    Light Showers
    26%
    —
    95°69°+8°
  6. Friday
    Aug 7
    Overcast
    44%
    —
    95°70°0°
  7. Saturday
    Aug 8
    Light Drizzle
    50%
    0.05″
    93°72°-2°
Chattanooga, TN
Next 24 hours · Mild now
66°76°86°12p6p12a6anow 75°high 83°low 69°
Chattanooga, TN
Anemometer · 24h winds · from true
NESW
From · True
WSW
254° · veering 55°
Direction
WSW
254°
Sustained
7
mph
Gust
14
mph
Peak 24h
19
avg 5 mph
Beaufort · 2 · LIGHT BRZ
0
CALM
<1
1
LIGHT AIR
1–3
2
LIGHT BRZ
4–7
3
GENTLE BRZ
8–12
4
MOD BRZ
13–18
5
FRESH BRZ
19–24
6
STRONG BRZ
25–31
7
NEAR GALE
32–38
24h · sust vs gust · mph
avg 5 mph · pk 19 mph @ 4:00p
01020MPHB1B2B3B4B5-21h-18h-15h-12h-9h-6h-3h-24hNOWpk 164SUSTGUST
−24h−18h−12h−6hnow
Light breeze veering 55° from the wsw.
Chattanooga, TN
Barometer · 24h pressure · mb
STORMRAINCHANGEFAIRDRY9901000101010201030
Pressure · mb
982.9
+1.9 mb in 3h · rising · 29.03 inHg
Now
982.9
mb
3h
+1.9
mb
12h
+2.2
mb
24h
-1.9
mb
Regime · STORM
STORM
RAIN
CHANGE
FAIR
DRY
24h · Pressure · mb
range 981–986
975980985990-21h-18h-15h-12h-9h-6h-3h-24hNOW985.8980.9983.9
The low is filling — pressure climbing out of storm territory.
Chattanooga, TN
Air quality
27
AQI
Good
↓-13 in 6h▲Peak ~37 @ 9 PM

AQI 27 (Good), driven by PM2.5. AQI down 13 over the last 6 hours (gradual decline). PM2.5 at 7.5 µg/m³, PM10 at 7.6 µg/m³ — typical background levels with no transport signature.

OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion during the projected peak around 9 PM.

PM 2.5DRIVERGood
7.5μg/m³
PM 10Good
8μg/m³
NO₂Good
2μg/m³
OzoneModerate
69μg/m³
UV IndexModerate
2.8

What's driving it

Ozone × UV × Sky

Ozone at AQI 33 now. With UV 4.0 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 17.

Present
AQI 33
UV peak
4.0 at 1 PM
Sky at peak
clear
Projected peak
AQI 17

PM × Wind × Precip

PM2.5 at 7.5 µg/m³, PM10 at 7.6 µg/m³ — typical background levels with no transport signature.

PM2.5/PM10
0.99
Wind
light
Recent rain
1h in last 6h
Pattern
background

Trends

Seven days of AQI and PM2.5.

Hourly air-quality data from the Copernicus Atmosphere Monitoring Service, charted across the past and next several days. Dashed lines mark the AQI breakpoints at 50 (Good → Moderate) and 100 (Moderate → Unhealthy for Sensitive Groups).

7-DAY AQI TREND50100SUNMONTUEWEDTHUFRISATSUN7-DAY PM2.5 TREND · μg/m³370
Chattanooga, TN
Sky cover · visibility · 24h
Cloud cover
100%
OVERCAST
100%0%−24h−18h−12h−6hnow
Visibility
32.4mi
UNLIMITED
57 mi0 mi−24h−18h−12h−6hnow
Earth · GOES-19 ABI
Full Disk · Visible · GeoColor
GOES-19 full disk Visible · GeoColor
True-color daytime, blue/IR sandwich at night
14:58 UTC · Chattanooga, TN · NOAA NESDIS / STAR · up to 10848 px
Continental US · GOES-19 ABI
CONUS Sector · Visible · GeoColor
GOES-19 CONUS Visible · GeoColor
Daytime true-color, blue-light/IR sandwich at night
14:58 UTC · Chattanooga, TN · NOAA NESDIS / STAR · 5-min cadence · up to 10000 px
Chattanooga, TN
Satellite · infrared · animated
Chattanooga, TN
Loading IR frames…
IR · cloud-top temp© RainViewer · Carto
Chattanooga, TN
Almanac · Sunday, August 2
Red sky at night, sailor's delight.
Civil dawn
6:24 AM
Sunrise
2:51 AM
Daylight
13h 52m
Sunset
4:43 PM
Civil dusk
9:12 PM
Planting note
Sow fall peas. Start kale and collard seedlings for fall.
Chattanooga, TN
The moon
Waning Gibbous
84% illuminated
Moonrise
10:23 PM
Moonset
10:45 AM
In sign
♓︎ Pisces
Chattanooga, TN
Microseason
Aug 1–5

Dusk arrives one minute earlier each night

celestial
Jan 159% of the yearDec 31

Read this microseason across nine climate regions →

Chattanooga at a glance

  • Today vs. normal: 10°F above the seasonal normal for this latitude
  • Last frost: March 17 (climatological average for this latitude)
  • Microseason: Aug 1–5
  • Planting window: Sow fall peas. Start kale and collard seedlings for fall.

ZIP codes: 37402, 37403, 37404, 37405, 37406, 37407, 37408, 37409 +8 more

16-Day Forecast — Chattanooga

  1. Sun83°72°57%
  2. Mon82°69°21%
  3. Tue89°68°60%
  4. Wed87°69°61%
  5. Thu95°69°26%
  6. Fri95°70°44%
  7. Sat93°72°50%
  8. Sun94°71°42%
  9. Mon95°74°37%
  10. Tue96°74°29%
  11. Wed97°75°35%
  12. Thu97°76°33%
  13. Fri96°76°39%
  14. Sat98°72°26%
  15. Sun98°71°30%
  16. Mon94°72°30%

Forecast data from Open-Meteo (CC BY 4.0).

Live wind & temperature near Chattanooga

Right now in the garden

Peak growing season

As of August 2, the growing season is at its peak — frost is months away. Continue succession-planting beans and summer squash. Start fall brassicas (broccoli, cabbage, kale) from seed indoors for transplanting in late summer.

SPC Convective Outlook

Storm Prediction Center — Chattanooga

SPC includes Chattanooga in the general thunderstorm area today — no severe risk, but storms are possible.

  • TODAYTSTMGeneral Thunderstorms
  • TOMORROWTSTMGeneral Thunderstorms
  • DAY 3TSTMGeneral Thunderstorms

Thunderstorms possible. Not severe, but capable of producing lightning and brief heavy rain.

Source: NOAA / NWS Storm Prediction Center categorical convective outlook. Outlooks are re-issued multiple times per day; this page reflects the most recent SPC polygons covering the city’s coordinates.

Sun & seasons in Chattanooga

Chattanooga sits in Hamilton County, where the year’s longest day runs 14h 31m of daylight and its shortest just 9h 48m — a swing of +4h 44m between the June and December solstices. Clocks spring forward on Sunday, March 8, 2026 and fall back on Sunday, November 1, 2026.

Nashville, the state’s largest city, lies about 115 miles to the NW. The nearest town Chattanooga tracks is Kahite, roughly 67 miles to the ENE.

Air quality in Chattanooga’s county has held roughly steady since 2020; its cleanest year on record was 2025 (median AQI 44). See the full air-quality history for Chattanooga.

January 1–5: Frost quiets the live oaks.January 6–10: Still water thickens with ice.January 11–15: Springs begin to move beneath ice.January 16–20: Cardinal dawn calls grow bolder.January 21–25: Late January thaw pulses.January 26–31: Last freeze locks the land.February 1–5: February's lengthening light.February 6–10: Warming winds thaw the margin.February 11–15: Magnolia blooms break the gray.February 16–20: Mockingbirds resume the dawn chorus.February 21–25: Rain replaces the last snow.February 26–28: Mist clings to greening valleys.March 1–5: The green pulse awakens.March 6–10: Hibernators emerge to call.March 11–15: Dogwood and redbud ignite.March 16–20: Swallowtails emerge from winter silk.March 21–25: Light crowns the dogwood canopy.March 26–31: Redbud cascades over the thaw.April 1–5: Thunder announces the wet season.April 6–10: Barn swallows carve the warming sky.April 11–15: Magnolia blooms and falls in a breath.April 16–20: First rainbows arch over thunderheads.April 21–25: Reeds push through marsh water.April 26–30: Frost retreats; seedlings rise free.May 1–5: Warblers flood the canopy in waves.May 6–10: Tulip poplar lights the forest crown.May 11–15: Shad pulse upstream through rapids.May 16–20: Roses open on the Piedmont edge.May 21–25: Fireflies scout the humid dusk.May 26–31: Frog choruses rise from every wetland.June 1–5: Fireflies pulse through the magnolias.June 6–10: Kudzu climbs deeper into green.June 11–15: Sun climbs to its northern throne.June 16–20: Heat settles and the rain begins.June 21–25: The longest day turns toward shadow.June 26–30: Fireflies drift through Spanish moss.July 1–5: Cicadas claim the scorching afternoon.July 6–10: Thunderheads boil and break at dusk.July 11–15: Thunder builds each drowsy afternoon.July 16–20: Cicadas claim the long noon.July 21–25: Dog days drape the earth in haze.July 26–31: Katydids begin their rasping chorus.August 1–5: Dusk arrives one minute earlier each night.August 6–10: Meteorological summer's turning page.August 11–15: Cool winds gather at the margins.August 16–20: Dog-day cicadas rise.August 21–25: Heat breaks in creek beds.August 26–31: Monarchs gather strength.September 1–5: Harvests begin in earnest.September 6–10: Dew beads on resurrection fern.September 11–15: Raptors trail the thermals.September 16–20: Day and dark find balance.September 21–25: Thunder quiets the land.September 26–30: Insects retreat below.October 1–5: Swamp waters recede.October 6–10: Maples ignite the ridge.October 11–15: Asters crown the meadows.October 16–20: Crickets sing at dusk.October 21–25: Frost paints the garden.October 26–31: Light rains whisper down.November 1–5: Sweetgum Turns Crimson.November 6–10: Camellia Blooms Break Through.November 11–15: Earth Stiffens Underfoot.November 16–20: Bare Limbs Hold the Light.November 21–25: First Frost Grips the High Ground.November 26–30: North Wind Strips the Last Leaves.December 1–5: Darkness Falls Before Dinner.December 6–10: Winter Locks the Land.December 11–15: Wildlife Retreats to Shelter.December 16–20: Ice Edges Deepen Inward.December 21–25: The Sun Begins its Return.December 26–31: The Year Turns in Silence.🌱February 14 — First skunk-cabbage spathes thaw their way up☀️March 20 — Spring equinox — day and night balance🌸April 5 — Cherry blossoms peak in the parks🐦May 10 — Warbler migration peaks along the coast✨May 25 — First fireflies scout the meadows at dusk🌞June 21 — Summer solstice — longest day🦗July 25 — Peak cicada chorus in the afternoons🌊August 18 — Warmest sea-surface temperatures of the year🍂September 22 — Autumn equinox — the slow turn❄️October 25 — First widespread frost in the suburbs🍁November 10 — Peak leaf color across the Hudson Valley🌙December 21 — Winter solstice — longest night

Microseason · August 1–5

Dusk arrives one minute earlier each night

Sunset slides back toward 8 PM; darkness creeps in, signaling summer's decline though heat persists.

Day 214 of 365 · Wedge 43 of 72

The solar year drawn as a wheel of 72 five-day windows. Each wedge is one microseason; the four colored arcs mark winter, spring, summer, and autumn; the small icons sit at notable phenological events. The crimson pointer creeps clockwise as the year turns.

Planting calendar

MonthPlantHarvest
January——
February——
Marchlettuce, peas, spinach, radishes—
Aprillettuce, peas, spinach, radishes, tomatoes, peppers, beans, squash—
Maytomatoes, peppers, beans, squashlettuce, peas, radishes
Junetomatoes, peppers, beans, squashlettuce, peas, radishes
July—tomatoes, beans, summer squash
August—tomatoes, beans, summer squash
September—tomatoes, beans, summer squash
Octoberfall brassicas, garlic (overwinter), carrotswinter squash, tomatoes (last)
Novemberfall brassicas, garlic (overwinter), carrots—
December——

A year in weather

Chattanooga peaks at about 79°F in July and bottoms near 39°F in January; December brings the heaviest rain (5.4 inches) and October the least (2.4 inches).

MonthMean tempPrecipRainy days
January39°5.1″16
February42°4.5″15
March50°5.3″17
April59°4.6″15
May67°3.6″16
June76°3.5″16
July79°4.1″21
August78°4.3″21
September73°2.8″14
October63°2.4″9
November50°4.1″12
December42°5.4″15

Regional context

Drawing on NOAA NCEI 1991-2020 normals, Chattanooga's January averages 39°F and July 79°F — 40°F apart — while precipitation totals roughly 49.8 inches over some 187 days.

Chattanooga's precipitation spreads evenly: December peaks at 5.4 inches on 15.4 wet days, while October holds 2.4 inches over 9.3 — no month dominates Chattanooga's rain calendar. That lines Chattanooga up with places like Ridgeside, TN, Red Bank, TN and East Ridge, TN, fed by overlapping storm tracks.

Chattanooga's growing window opens around mid-March, once Chattanooga's overnight lows stop freezing — sow peas, lettuce, spinach, and radishes. Warm-soil crops in Chattanooga wait about two weeks past Chattanooga's last frost, once the soil warms. Chattanooga's window closes around mid-December as overnight lows return below freezing. In Chattanooga, low spots run 4-7°F colder than nearby slopes, nudging Chattanooga's frost dates a week.

Similar climates: Ridgeside, TN, Red Bank, TN, East Ridge, TN, Harrison, TN, Walden, TN.

Naturalist notes

By late April, dogwood trees across Chattanooga begin their characteristic white bloom, marking the transition into warmer spring weather.

Ruby-throated hummingbirds typically return to Tennessee feeders in mid-April after their winter migration south.

Frequently asked

When does it freeze in Chattanooga?
Chattanooga's last spring frost lands near mid-March, and in Chattanooga the first fall frost follows around mid-December.
What is the rainy season in Chattanooga?
Rainfall in Chattanooga peaks in December near 5.4 inches, out of about 50 inches annually.
What is the warmest month in Chattanooga?
On average July tops the year in Chattanooga at about 79°F.
What is the coldest month in Chattanooga?
The coldest stretch in Chattanooga falls in January, around 39°F on average.
When can I start a vegetable garden in Chattanooga?
Around mid-March, start frost-hardy crops in Chattanooga; tomatoes and basil belong a fortnight later.
How many rainy days does Chattanooga get?
Chattanooga records around 187 days of measurable precipitation annually.
What hardiness zone is Chattanooga?
Because Chattanooga bottoms near 39°F in January, that winter low sets Chattanooga's USDA zone — verify by ZIP.
What is the 10-day forecast for Chattanooga?
Chattanooga's extended outlook — daily high and low temperatures and precipitation chances for each upcoming day — is in the daily forecast above.
Will it rain this week in Chattanooga?
See this week's day-by-day rain chances for Chattanooga in the daily forecast above, and the next 24 hours in the hourly chart.
What is the weather like right now in Chattanooga?
Current conditions for Chattanooga and the next 24 hours — temperature, precipitation chance, and wind by the hour — are in the hourly forecast chart above.
How often is the Chattanooga forecast updated?
The Chattanooga forecast on this page is built from Open-Meteo weather-model data and refreshes regularly through the day.
When are sunrise and sunset in Chattanooga?
Today's sunrise and sunset times for Chattanooga are in the Almanac section above, along with civil dawn, civil dusk, and day length. Day length is longest near the summer solstice and shortest near the winter solstice.
How accurate is the weather forecast for Chattanooga?
The next few days in Chattanooga's forecast are the most reliable; accuracy declines beyond about a week as weather-model uncertainty grows.

Climate

In Chattanooga, Tennessee, the humid subtropical climate runs from about 39°F in January to 79°F in July, a 40°F seasonal range.

Across the year, Chattanooga collects about 50 inches of precipitation over roughly 187 days with measurable rain or snow.

Chattanooga's 40°F range, set by its 35.1°N position, drives frost timing and what thrives in Chattanooga.

All cities in Tennessee →

Atlanta, GA weather →

ZIP codes in Chattanooga

  • 37415
  • 37416
  • 37410
  • 37411
  • 37419
  • 37409
  • 37421
  • 37408
  • 37403
  • 37402
  • 37407
  • 37405
  • 37406
  • 37404
  • 37343
  • 37450
  • 37351
  • 37401
  • 37414
  • 37424

Climate normals from the Open-Meteo Climate API. Köppen approximation from NOAA NCEI U.S. Climate Regions. See methodology for data sources, editorial rules, and corrections. Maintainer: Brian Tighe.