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

St. Louis, Missouri Weather

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

St. Louis weather forecast — hour by hour, 7-day outlook, NOAA radar

St. Louis, MO
Sunday, August 2 at 9:59 AM
70
°
Overcast
Feels like
71°
Humidity
89%
Wind
11 mph
Sunrise
1:03 AM
Sunset
3:10 PM
St. Louis, MO
Hour by hour · 24h
24-Hour ForecastSt. Louis, MO: 24-hour forecast. Temperatures range from 66 to 81 degrees Fahrenheit.
L 66°H 81°
St. Louis, MO
7-day forecast
  1. Today
    Aug 2
    Overcast
    —
    —
    81°67°—
  2. Monday
    Aug 3
    Clear
    —
    —
    87°66°+6°
  3. Tuesday
    Aug 4
    Clear
    —
    —
    91°68°+4°
  4. Wednesday
    Aug 5
    Overcast
    —
    —
    94°69°+3°
  5. Thursday
    Aug 6
    T-storm w/ Hail
    32%
    —
    98°77°+4°
  6. Friday
    Aug 7
    Drizzle
    25%
    0.06″
    98°74°0°
  7. Saturday
    Aug 8
    Light Drizzle
    15%
    —
    102°73°+4°
St. Louis, MO
Next 24 hours · Mild now
62°73°84°12p6p12a6anow 67°high 81°low 66°
St. Louis, MO
Anemometer · 24h winds · from true
NESW
From · True
NNW
345° · veering 74°
Direction
NNW
345°
Sustained
11
mph
Gust
23
mph
Peak 24h
31
avg 10 mph
Beaufort · 3 · GENTLE 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 10 mph · pk 31 mph @ 11:00p
01020MPHB1B2B3B4B5-21h-18h-15h-12h-9h-6h-3h-24hNOWpk 222SUSTGUST
−24h−18h−12h−6hnow
Light breeze veering 74° from the nnw.
St. Louis, MO
Barometer · 24h pressure · mb
STORMRAINCHANGEFAIRDRY9901000101010201030
Pressure · mb
993.7
+1.7 mb in 3h · rising · 29.34 inHg
Now
993.7
mb
3h
+1.7
mb
12h
+3.8
mb
24h
+5.8
mb
Regime · STORM
STORM
RAIN
CHANGE
FAIR
DRY
24h · Pressure · mb
range 987–994
9809859909951000STORM|RAIN-21h-18h-15h-12h-9h-6h-3h-24hNOW992.9987.1992.9
The low is filling — pressure climbing out of storm territory.
St. Louis, MO
Air quality
31
AQI
Good
→0 in 6h▲Peak ~42 @ 9 PM

AQI 31 (Good), driven by PM2.5. AQI flat over the last 6 hours (within ±3 points). PM2.5 at 10.8 µg/m³, PM10 at 11.0 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
10.8μg/m³
PM 10Good
11μg/m³
NO₂Good
4μg/m³
OzoneModerate
78μg/m³
UV IndexLow
2.0

What's driving it

Ozone × UV × Sky

Ozone at AQI 37 now. With UV 4.0 peaking around 1 PM under partly cloudy skies, surface ozone likely climbs to AQI 14.

Present
AQI 37
UV peak
4.0 at 1 PM
Sky at peak
partly cloudy
Projected peak
AQI 14

PM × Wind × Precip

PM2.5 at 10.8 µg/m³, PM10 at 11.0 µg/m³ — typical background levels with no transport signature.

PM2.5/PM10
0.98
Wind
breezy
Recent rain
0h 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/m³340
St. Louis, MO
Sky cover · visibility · 24h
Cloud cover
98%
OVERCAST
100%0%−24h−18h−12h−6hnow
Visibility
30.0mi
UNLIMITED
34 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
14:59 UTC · St. Louis, MO · 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
14:59 UTC · St. Louis, MO · NOAA NESDIS / STAR · 5-min cadence · up to 10000 px
St. Louis, MO
Satellite · infrared · animated
St. Louis, MO
Loading IR frames…
IR · cloud-top temp© RainViewer · Carto
St. Louis, MO
Almanac · Sunday, August 2
Red sky at night, sailor's delight.
Civil dawn
5:35 AM
Sunrise
1:03 AM
Daylight
14h 07m
Sunset
3:10 PM
Civil dusk
8:41 PM
Planting note
Sow fall peas. Start kale and collard seedlings for fall.
St. Louis, MO
The moon
Waning Gibbous
84% illuminated
Moonrise
9:44 PM
Moonset
10:06 AM
In sign
♓︎ Pisces
St. Louis, MO
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 →

St. Louis at a glance

  • Today vs. normal: 6°F above the seasonal normal for this latitude
  • Last frost: April 8 (climatological average for this latitude)
  • Microseason: Aug 1–5
  • Planting window: Sow fall peas. Start kale and collard seedlings for fall.

16-Day Forecast — St. Louis

  1. Sun81°67°6%
  2. Mon87°66°0%
  3. Tue91°68°0%
  4. Wed94°69°5%
  5. Thu98°77°32%
  6. Fri98°74°25%
  7. Sat102°73°15%
  8. Sun101°79°10%
  9. Mon102°78°7%
  10. Tue103°78°13%
  11. Wed102°79°17%
  12. Thu106°73°25%
  13. Fri106°75°27%
  14. Sat94°82°35%
  15. Sun100°76°24%
  16. Mon101°75°20%

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

Live wind & temperature near St. Louis

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.

Sun & seasons in St. Louis

St. Louis sits in St. Louis County, where the year’s longest day runs 14h 52m of daylight and its shortest just 9h 28m — a swing of +5h 24m between the June and December solstices. Clocks spring forward on Sunday, March 8, 2026 and fall back on Sunday, November 1, 2026.

Kansas City, the state’s largest city, lies about 234 miles to the W. The nearest town St. Louis tracks is O'Fallon, roughly 27 miles to the WNW.

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——
March——
Aprillettuce, peas, spinach, radishes—
Maylettuce, peas, spinach, radishes, tomatoes, peppers, beans, squashlettuce, peas, radishes
Junetomatoes, peppers, beans, squashlettuce, peas, radishes
Julytomatoes, peppers, beans, squashtomatoes, beans, summer squash
August—tomatoes, beans, summer squash
Septemberfall brassicas, garlic (overwinter), carrotstomatoes, beans, summer squash
Octoberfall brassicas, garlic (overwinter), carrotswinter squash, tomatoes (last)
November——
December——

A year in weather

July is St. Louis's warmest stretch (~81°F) and January its coldest (~31°F); precipitation crests in May at 4.4 inches and ebbs in January to 2.1 inches.

MonthMean tempPrecipRainy days
January31°2.1″13
February35°2.3″12
March45°4.0″16
April57°4.3″15
May66°4.4″17
June75°4.2″15
July81°2.7″13
August80°2.9″13
September72°2.6″11
October60°2.8″11
November45°3.6″13
December34°3.0″12

Regional context

St. Louis's climate, from NOAA NCEI 1991-2020 station normals, pairs 31°F Januarys with 81°F Julys — a 50°F swing. About 39.1 inches of precipitation falls over roughly 161 days a year.

St. Louis's precipitation spreads evenly: May peaks at 4.4 inches on 17.2 wet days, while January holds 2.1 inches over 12.7 — no month dominates St. Louis's rain calendar. That even rhythm groups St. Louis with places like Wellston, MO, Hillsdale, MO and Uplands Park, MO.

By mid-April the frosts ease in St. Louis, opening the season for peas, lettuce, spinach, and radishes. In St. Louis, warm-season transplants — tomatoes, peppers, basil — wait two weeks past St. Louis's frost date. It shuts near mid-November, when freezes return to St. Louis and tender plants need cover. In St. Louis, low spots run 4-7°F colder than nearby slopes, nudging St. Louis's frost dates a week.

Similar climates: Wellston, MO, Hillsdale, MO, Uplands Park, MO, Pine Lawn, MO, Velda Village Hills, MO.

Naturalist notes

Late May brings the peak blooming period for native elderberry shrubs throughout the St. Louis area.

Ruby-throated hummingbirds typically arrive in St. Louis during the first week of May as spring migration reaches its peak.

Frequently asked

When does it freeze in St. Louis?
St. Louis's last spring frost lands near mid-April, and in St. Louis the first fall frost follows around mid-November.
What is the rainy season in St. Louis?
St. Louis sees its heaviest rain in May (around 4.4 inches), part of roughly 39 inches a year.
What is the warmest month in St. Louis?
St. Louis peaks in July, when the mean runs near 81°F.
What is the coldest month in St. Louis?
January is St. Louis's coldest month, averaging about 31°F.
When can I start a vegetable garden in St. Louis?
Hardy spring crops go in near mid-April in St. Louis; tender peppers and squash wait 10–14 days.
How many rainy days does St. Louis get?
St. Louis averages about 161 days with measurable rain or snow each year.
What hardiness zone is St. Louis?
Because St. Louis bottoms near 31°F in January, that winter low sets St. Louis's USDA zone — verify by ZIP.
What is the 10-day forecast for St. Louis?
St. Louis'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 St. Louis?
See this week's day-by-day rain chances for St. Louis in the daily forecast above, and the next 24 hours in the hourly chart.
What is the weather like right now in St. Louis?
Current conditions for St. Louis and the next 24 hours — temperature, precipitation chance, and wind by the hour — are in the hourly forecast chart above.
How often is the St. Louis forecast updated?
The St. Louis forecast on this page is built from Open-Meteo weather-model data and refreshes regularly through the day.
When are sunrise and sunset in St. Louis?
Today's sunrise and sunset times for St. Louis 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 St. Louis?
The next few days in St. Louis's forecast are the most reliable; accuracy declines beyond about a week as weather-model uncertainty grows.

Climate

In St. Louis, Missouri, the humid subtropical climate runs from about 31°F in January to 81°F in July, a 50°F seasonal range.

In a typical year St. Louis records about 39 inches of precipitation on around 161 days.

From 38.6°N, St. Louis sees a 50°F seasonal swing that governs St. Louis's planting and frost windows.

All cities in Missouri →

ZIP codes in St. Louis

  • 63110
  • 63111
  • 63112
  • 63113
  • 63115
  • 63116
  • 63118
  • 63120
  • 63107
  • 63106
  • 63104
  • 63103
  • 63102
  • 63101
  • 63109
  • 63108
  • 63155
  • 63139
  • 63137
  • 63143
  • 63147
  • 63150
  • 63156
  • 63157
  • 63158
  • 63160
  • 63163
  • 63164
  • 63166
  • 63169
  • 63177
  • 63178
  • 63179
  • 63180
  • 63188
  • 63197

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.