Chattanooga, Tennessee Weather
Thunder quiets the land. Day 93 of summer. Read this microseason across nine climate regions →
Chattanooga weather forecast — hour by hour, 7-day outlook, NOAA radar
Conditions updated 10:21 AM EDT · Open-Meteo
- TodaySep 21Heavy Rain later47%0.60″96°71°—
- TuesdaySep 22Overcast25%—87°71°-9°
- WednesdaySep 23Showers55%—82°67°-5°
- ThursdaySep 24Drizzle26%—79°63°-3°
- FridaySep 25Light Drizzle——80°62°+1°
- SaturdaySep 26Overcast——81°62°+1°
- SundaySep 27Overcast——82°65°+1°
Air quality now AQI 55 · Moderate
AQI 55 (Moderate), driven by PM2.5. AQI projected to climb to 66 over the next 6 hours. PM2.5 at 10.0 µg/m³ (AQI 53) with a 0.97 fine-to-coarse ratio and 2 mph wind — combustion smoke trapped in stagnant air, not road dust.
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion during the projected peak around 7 PM.
What's driving it
Ozone × UV × Sky
Ozone at AQI 45 now. With UV 3.0 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 18.
- Present
- AQI 45
- UV peak
- 3.0 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 18
PM × Wind × Precip
PM2.5 at 10.0 µg/m³ (AQI 53) with a 0.97 fine-to-coarse ratio and 2 mph wind — combustion smoke trapped in stagnant air, not road dust.
- PM2.5/PM10
- 0.97
- 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).
September dries up ditches or breaks down bridges.
- Moonrise
- 4:59 PM
- Moonset
- 2:16 AM
- In sign
- ♑︎ Capricorn
Thunder quiets the land
Read this microseason across nine climate regions →
All 72 microseasons on the year wheel →
Chattanooga at a glance
- Today vs. normal: Today averages 84°F (high 96°F, low 71°F), 13°F above the 71°F normal for Sep 21
- Last frost: March 24 (1991–2020 median, NOAA station 6 km away)
- Microseason: Sep 21–25
- Planting calendar: September — harvest tomatoes, peppers, beans, summer squash, winter squash
16-Day Forecast — Chattanooga
- Mon96°71°47%
- Tue87°71°25%
- Wed82°67°55%
- Thu79°63°26%
- Fri80°62°8%
- Sat81°62°3%
- Sun82°65°4%
- Mon84°64°7%
- Tue84°62°12%
- Wed84°63°24%
- Thu85°66°15%
- Fri82°65°20%
- Sat85°68°13%
- Sun73°69°13%
- Mon68°57°25%
- Tue70°49°36%
Forecast data from Open-Meteo (CC BY 4.0).
Live wind & temperature near Chattanooga
Interactive wind and temperature map centered on Chattanooga — it loads in your browser. Open the full weather map.
Right now in the garden
Late season
As of September 21, the first frost (around November 9) is about 7 weeks away. Frost-tender plants keep producing until then. This city's planting calendar for September: harvest tomatoes, peppers, beans, summer squash, and winter squash.
SPC Convective Outlook
Storm Prediction Center — Chattanooga
SPC has placed Chattanooga in the Marginal Risk category for severe thunderstorms today.
- TODAYMRGLMarginal Risk
- TOMORROWMRGLMarginal Risk
- DAY 3NONENo severe risk
Isolated severe storms possible. Limited threat for hail or damaging wind.
Source: NOAA / NWS Storm Prediction Center categorical convective outlook.
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
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.
Planting calendar
| Month | Plant | Harvest |
|---|---|---|
| March | lettuce, peas, spinach, radishes | radishes |
| April | lettuce, spinach, radishes, tomatoes, peppers, beans, squash | lettuce, spinach, radishes |
| May | tomatoes, peppers, beans, squash | lettuce, peas, spinach, radishes |
| June | beans, squash | lettuce, peas, beans, summer squash, garlic |
| July | tomatoes, peppers, beans, squash | tomatoes, peppers, beans, summer squash |
| August | beans, squash, fall brassicas, carrots | tomatoes, peppers, beans, summer squash, winter squash |
| September | — | tomatoes, peppers, beans, summer squash, winter squash |
| October | garlic (overwinter) | tomatoes, peppers, beans, summer squash, winter squash |
| November | — | tomatoes, peppers, beans, summer squash, winter squash, fall brassicas, carrots |
| December | — | fall brassicas, carrots |
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).
| Month | Mean temp | Precip |
|---|---|---|
| January | 39° | 5.1″ |
| February | 42° | 4.5″ |
| March | 50° | 5.3″ |
| April | 59° | 4.6″ |
| May | 67° | 3.6″ |
| June | 76° | 3.5″ |
| July | 79° | 4.1″ |
| August | 78° | 4.3″ |
| September | 73° | 2.8″ |
| October | 63° | 2.4″ |
| November | 50° | 4.1″ |
| December | 42° | 5.4″ |
Regional context
Similar climates Ridgeside, TN, Red Bank, TN, East Ridge, TN
Drawing on modelled 1991-2020 normals (EC_Earth3P_HR model via Open-Meteo), Chattanooga's January averages 39°F and July 79°F — 40°F apart — while precipitation totals roughly 49.8 inches.
Chattanooga's precipitation spreads evenly across the seasons: December peaks at 5.4 inches, while October holds 2.4 inches — no season 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 March 24, 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 November 9 as Chattanooga's overnight lows return below freezing. In about half of years, Chattanooga's last freeze comes after March 24.
Similar climates: Ridgeside, TN, Red Bank, TN, East Ridge, TN, Harrison, TN, Walden, TN.
Frequently asked
- When does it freeze in Chattanooga?
- Chattanooga's last spring frost lands near March 24, and in Chattanooga the first fall frost follows around November 9.
- 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 March 24, start frost-hardy crops in Chattanooga; tomatoes and basil belong a fortnight later.
- 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.
Chattanooga sits at 35.1°N; its climate zone is humid subtropical (Köppen approximation).
ZIP codes in Chattanooga
- 37343
- 37351
- 37401
- 37402
- 37403
- 37404
- 37405
- 37406
- 37407
- 37408
- 37409
- 37410
- 37411
- 37412
- 37414
- 37415
- 37416
- 37419
- 37421
- 37424
- 37450