Chattanooga weather in September: Chattanooga, Tennessee: normal highs, lows, rain and records for September
Chattanooga in September has a normal high of 84°F and a normal low of 64°F, a daily mean of 74°F, falling from 88°F on the 1st to 80°F by the 30th. Measurable precipitation falls on 8 days in a normal September, 4.23 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 29°C and low of 18°C, 107 mm of precipitation in September.
- NOAA stationChattanooga Airport
- Station IDUSW00013882
- Location35.03°N 85.20°W
- Elevation671 ft (205 m)
- From the center4 miles
- Population191,496
- Jan 51° 32°
- Feb 56° 36°
- Mar 64° 42°
- Apr 74° 50°
- May 81° 59°
- Jun 88° 67°
- Jul 91° 71°
- Aug 90° 70°
- Sep 84° 64°
- Oct 74° 51°
- Nov 62° 40°
- Dec 53° 35°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Chattanooga in September?
The normal high is 84°F and the normal low 64°F, for a daily mean of 73.9°F. September is 6.1°F cooler than August and 11.2°F warmer than October. September is the 4th warmest month of the year in Chattanooga and the 8th wettest. Across the month the normal high falls 8°F, from 88°F on September 1 to 80°F on September 30. From one year to the next September's mean temperature typically moves about 2.7°F either way (NOAA's standard deviation), so roughly two Septembers in three average between 71°F and 77°F.
Bars above: each day's normal high to low. Columns below: the chance of 0.01 inch or more of precipitation that day, on a scale of 0 to 100% (highest 28%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 88°F | 68°F | 28% | 19% |
| September 8 | 86°F | 66°F | 27% | 18% |
| September 15 | 85°F | 64°F | 26% | 18% |
| September 22 | 83°F | 62°F | 26% | 17% |
| September 30 | 80°F | 58°F | 26% | 17% |
Every day of September: normal high, low and chance of precipitation (warmest afternoon September 1, coldest night September 30)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| September 1 | 88°F | 68°F | 28% | 19% | 13 h |
| September 2 | 88°F | 68°F | 28% | 19% | 12 h 50 min |
| September 3 | 88°F | 68°F | 28% | 19% | 12 h 50 min |
| September 4 | 87°F | 67°F | 28% | 19% | 12 h 50 min |
| September 5 | 87°F | 67°F | 28% | 18% | 12 h 50 min |
| September 6 | 87°F | 67°F | 27% | 18% | 12 h 50 min |
| September 7 | 87°F | 66°F | 27% | 18% | 12 h 40 min |
| September 8 | 86°F | 66°F | 27% | 18% | 12 h 40 min |
| September 9 | 86°F | 66°F | 27% | 18% | 12 h 40 min |
| September 10 | 86°F | 66°F | 27% | 18% | 12 h 40 min |
| September 11 | 86°F | 65°F | 27% | 18% | 12 h 40 min |
| September 12 | 85°F | 65°F | 26% | 18% | 12 h 30 min |
| September 13 | 85°F | 65°F | 26% | 18% | 12 h 30 min |
| September 14 | 85°F | 64°F | 26% | 18% | 12 h 30 min |
| September 15 | 85°F | 64°F | 26% | 18% | 12 h 30 min |
| September 16 | 84°F | 64°F | 26% | 18% | 12 h 20 min |
| September 17 | 84°F | 63°F | 26% | 18% | 12 h 20 min |
| September 18 | 84°F | 63°F | 26% | 18% | 12 h 20 min |
| September 19 | 84°F | 63°F | 26% | 17% | 12 h 20 min |
| September 20 | 83°F | 62°F | 26% | 17% | 12 h 20 min |
| September 21 | 83°F | 62°F | 26% | 18% | 12 h 10 min |
| September 22 | 83°F | 62°F | 26% | 17% | 12 h 10 min |
| September 23 | 82°F | 61°F | 26% | 17% | 12 h 10 min |
| September 24 | 82°F | 61°F | 26% | 17% | 12 h 10 min |
| September 25 | 82°F | 60°F | 26% | 17% | 12 h 10 min |
| September 26 | 81°F | 60°F | 26% | 17% | 12 h |
| September 27 | 81°F | 60°F | 26% | 17% | 12 h |
| September 28 | 81°F | 59°F | 26% | 17% | 12 h |
| September 29 | 80°F | 59°F | 26% | 17% | 12 h |
| September 30 | 80°F | 58°F | 26% | 17% | 11 h 50 min |
- Normal high
- 84°FSeptember average
- Normal low
- 64°FSeptember average
- Precipitation
- 4.23 inmonth total
- Days with precipitation
- 80.01 inch or more
- Days at 90°F or more
- 7
- Daylight
- 13 h to 11 h 50 minSeptember 1 to September 30
- Days at 70°F or more
- 29
- Days at 80°F or more
- 23
- Sunshine
- 78%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00013882; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Chattanooga in September?
On a given September day the chance of 0.01 inch or more is 27% on average, highest around September 1 (28%). In all, 4.23 in falls on 8 days of a normal September, 1 of them with an inch or more.
In a normal September in Chattanooga, 7 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00013882.
How humid and windy is Chattanooga in September?
At 3 p.m. the normal temperature is 78°F with 48% relative humidity and a dew point of 56°F; at 6 a.m. it is 60°F with 89% humidity. The wind averages 4.1 mph, most often from the north-northwest in the afternoon.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 60°F | 57°F | 89% | 2.0 mph | 53% |
| 9 a.m. | 66°F | 58°F | 77% | 4.4 mph | 52% |
| noon | 74°F | 57°F | 55% | 6.1 mph | 47% |
| 3 p.m. | 78°F | 56°F | 48% | 6.9 mph | 44% |
| 6 p.m. | 75°F | 57°F | 52% | 6.1 mph | 52% |
| 9 p.m. | 67°F | 59°F | 75% | 2.9 mph | 62% |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00013882. Hourly normals exist only for NOAA's first-order stations; a dash where NOAA publishes no value for that hour (the sky at some hours).
What are the records for September in Chattanooga?
The warmest September temperature on Chattanooga's official record (since 1879) is 104°F, on September 7, 1925; the coldest is 36°F, on September 30, 1967. The wettest September brought 14.18 in (1977).
The September mean against the 1991-2020 normal of 73.9°F: 2021 72.8°F (−1.1), 2022 73.1°F (−0.8), 2023 75.3°F (+1.4), 2024 75.9°F (+2.0), 2025 75.0°F (+1.1), 2026 80.7°F (+6.8). 4 of 6 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 72.8°F | −1.1°F | 6.67 in |
| 2022 | 73.1°F | −0.8°F | 3.08 in |
| 2023 | 75.3°F | +1.4°F | 0.13 in |
| 2024 | 75.9°F | +2.0°F | 5.76 in |
| 2025 | 75.0°F | +1.1°F | 1.70 in |
| 2026 | 80.7°F | +6.8°F | 0.68 in |
Source: records: ACIS, NWS threaded record CHAthr; recent months: ACIS, station USW00013882. Records and recent months use complete months only.
How does September in Chattanooga compare across Tennessee?
Across the 116 places PlainClimate covers in Tennessee, September normal highs run from 74°F in Roan Mountain to 86°F in Memphis; Chattanooga's is 84°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.
Other months and places
- Chattanooga in August90°F by day, 70°F at night
- Chattanooga in October74°F by day, 51°F at night
- Chattanooga through the yearEvery month, frost dates, records and recent years
- Tennessee in SeptemberThe statewide normal and the warmest and coolest places
- Memphis: Tennessee's warmest Septembernormal high 86°F