Chattanooga, Tennessee Weather
Fireflies pulse through the magnolias. Day 77 of spring. Read this microseason across nine climate regions →
Chattanooga weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 3Partly Cloudy——82°56°—
- ThursdayJun 4Clear——86°61°+4°
- FridayJun 5Overcast——87°62°+1°
- SaturdayJun 6Overcast——89°62°+2°
- SundayJun 7Overcast17%—89°67°0°
- MondayJun 8Light Drizzle51%0.01″84°67°-5°
- TuesdayJun 9Light Drizzle41%0.01″80°68°-4°
PM2.5 at 11.9 µg/m³ (AQI 56) with a 0.95 fine-to-coarse ratio and 2 mph wind — combustion smoke trapped in calm air, not road dust. AQI flat over the last 6 hours (within ±3 points).
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion.
What's driving it
Ozone × UV × Sky
Ozone at AQI 31 now. With UV 0.0 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 7 by mid-afternoon.
- Present
- AQI 31
- UV peak
- 0.0 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 7
PM × Wind × Precip
PM2.5 at 11.9 µg/m³ (AQI 56) with a 0.95 fine-to-coarse ratio and 2 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.95
- Wind
- calm
- Recent rain
- 0h in last 6h
- Pattern
- stagnant smoke
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).
A summer fog for fair, a winter fog for rain.
- Moonrise
- 3:54 AM
- Moonset
- 1:57 PM
- In sign
- ♑︎ Capricorn
Fireflies pulse through the magnolias
Chattanooga at a glance
- Today vs. normal: 11°F below the seasonal normal for this latitude
- Last frost: March 17 (climatological average for this latitude)
- Microseason: Jun 1–5
- Planting window: Harvest spring lettuce before it bolts. Sow heat-tolerant greens.
Right now in the garden
Peak growing season
As of June 4, 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.
Planting calendar
| Month | Plant | Harvest |
|---|---|---|
| January | — | — |
| February | — | — |
| March | lettuce, peas, spinach, radishes | — |
| April | lettuce, peas, spinach, radishes, tomatoes, peppers, beans, squash | — |
| May | tomatoes, peppers, beans, squash | lettuce, peas, radishes |
| June | tomatoes, peppers, beans, squash | lettuce, peas, radishes |
| July | — | tomatoes, beans, summer squash |
| August | — | tomatoes, beans, summer squash |
| September | — | tomatoes, beans, summer squash |
| October | fall brassicas, garlic (overwinter), carrots | winter squash, tomatoes (last) |
| November | fall brassicas, garlic (overwinter), carrots | — |
| December | — | — |
A year in weather
July brings Chattanooga's warmest temperatures (~81°F mean) while January delivers the coldest (~42°F). Rainfall reaches its peak in March (5.3 inches) and drops to its lowest point in October (3.6 inches).
| Month | Mean temp | Precip | Rainy days |
|---|---|---|---|
| January | 42° | 5.0″ | 7 |
| February | 46° | 5.0″ | 7 |
| March | 53° | 5.3″ | 8 |
| April | 62° | 4.9″ | 8 |
| May | 70° | 3.9″ | 7 |
| June | 77° | 4.2″ | 8 |
| July | 81° | 5.1″ | 8 |
| August | 80° | 3.7″ | 6 |
| September | 74° | 4.2″ | 5 |
| October | 63° | 3.6″ | 5 |
| November | 51° | 4.8″ | 6 |
| December | 44° | 5.3″ | 8 |
Regional context
Chattanooga falls within a humid subtropical climate region — sharing similar temperature ranges, seasonal patterns, and growing conditions with nearby cities in this zone.
Similar climates: Nashville, TN, Memphis, TN, Knoxville, TN, Clarksville, TN, Murfreesboro, 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 typically occurs around mid-March, and the first fall frost arrives around mid-December.
- What is the rainy season in Chattanooga?
- March stands as the wettest month with about 5.3 inches of rain on average; the city receives roughly 55 inches annually.
- What is the warmest month in Chattanooga?
- July typically brings the warmest weather, averaging about 81°F.
- What is the coldest month in Chattanooga?
- January typically delivers the coldest temperatures, averaging about 42°F.
- When can I start a vegetable garden in Chattanooga?
- Cool-season crops (peas, lettuce) can be planted around the last spring frost (mid-March); warm-season crops (tomatoes, peppers) should wait until 1–2 weeks after.
- How many rainy days does Chattanooga get?
- Chattanooga sees about 83 rainy days per year on average.
- What hardiness zone is Chattanooga?
- Chattanooga's USDA hardiness zone depends on its lowest average winter temperature; check the USDA's online lookup with the city ZIP for the current zone designation.
Climate
Chattanooga, Tennessee sits in a humid subtropical climate zone. January temperatures hover near 42°F while July averages 81°F — a 39°F seasonal swing.
Throughout the year, Chattanooga receives about 55 inches of precipitation spread over roughly 83 rainy days.
Climate patterns follow the city's latitude (35.1°N), proximity to large water bodies, and elevation — all factors that determine what grows here, when frost arrives, and daily weather conditions.