Huntsville weather in September: Huntsville, Alabama: normal highs, lows, rain and records for September
Huntsville in September has a normal high of 87°F and a normal low of 63°F, a daily mean of 75°F, falling from 90°F on the 1st to 82°F by the 30th. Measurable precipitation falls on 7 days in a normal September, 3.49 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 30°C and low of 17°C, 89 mm of precipitation in September.
- NOAA stationHuntsville Intnl Airport
- Station IDUSW00003856
- Location34.64°N 86.79°W
- Elevation624 ft (190 m)
- Population230,402
- Jan 52° 33°
- Feb 57° 36°
- Mar 66° 43°
- Apr 75° 51°
- May 83° 60°
- Jun 89° 68°
- Jul 92° 71°
- Aug 91° 70°
- Sep 87° 63°
- Oct 76° 52°
- Nov 64° 41°
- Dec 55° 36°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Huntsville in September?
The normal high is 87°F and the normal low 63°F, for a daily mean of 74.9°F. September is 5.6°F cooler than August and 11.0°F warmer than October. September is the 4th warmest month of the year in Huntsville and the 12th wettest. Across the month the normal high falls 8°F, from 90°F on September 1 to 82°F on September 30. From one year to the next September's mean temperature typically moves about 2.9°F either way (NOAA's standard deviation), so roughly two Septembers in three average between 72°F and 78°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 26%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 90°F | 68°F | 26% | 16% |
| September 8 | 89°F | 66°F | 25% | 15% |
| September 15 | 87°F | 64°F | 24% | 15% |
| September 22 | 85°F | 61°F | 24% | 15% |
| September 30 | 82°F | 58°F | 24% | 15% |
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 | 90°F | 68°F | 26% | 16% | 13 h |
| September 2 | 90°F | 67°F | 26% | 16% | 12 h 50 min |
| September 3 | 90°F | 67°F | 26% | 16% | 12 h 50 min |
| September 4 | 89°F | 67°F | 25% | 16% | 12 h 50 min |
| September 5 | 89°F | 67°F | 25% | 16% | 12 h 50 min |
| September 6 | 89°F | 66°F | 25% | 15% | 12 h 50 min |
| September 7 | 89°F | 66°F | 25% | 15% | 12 h 40 min |
| September 8 | 89°F | 66°F | 25% | 15% | 12 h 40 min |
| September 9 | 88°F | 66°F | 24% | 15% | 12 h 40 min |
| September 10 | 88°F | 65°F | 24% | 15% | 12 h 40 min |
| September 11 | 88°F | 65°F | 24% | 15% | 12 h 40 min |
| September 12 | 88°F | 65°F | 24% | 15% | 12 h 30 min |
| September 13 | 87°F | 64°F | 24% | 15% | 12 h 30 min |
| September 14 | 87°F | 64°F | 24% | 15% | 12 h 30 min |
| September 15 | 87°F | 64°F | 24% | 15% | 12 h 30 min |
| September 16 | 87°F | 64°F | 24% | 15% | 12 h 20 min |
| September 17 | 86°F | 63°F | 24% | 15% | 12 h 20 min |
| September 18 | 86°F | 63°F | 24% | 15% | 12 h 20 min |
| September 19 | 86°F | 63°F | 24% | 15% | 12 h 20 min |
| September 20 | 85°F | 62°F | 24% | 15% | 12 h 20 min |
| September 21 | 85°F | 62°F | 24% | 15% | 12 h 10 min |
| September 22 | 85°F | 61°F | 24% | 15% | 12 h 10 min |
| September 23 | 85°F | 61°F | 24% | 15% | 12 h 10 min |
| September 24 | 84°F | 61°F | 24% | 15% | 12 h 10 min |
| September 25 | 84°F | 60°F | 24% | 15% | 12 h 10 min |
| September 26 | 84°F | 60°F | 24% | 15% | 12 h |
| September 27 | 83°F | 60°F | 24% | 15% | 12 h |
| September 28 | 83°F | 59°F | 24% | 15% | 12 h |
| September 29 | 83°F | 59°F | 24% | 15% | 12 h |
| September 30 | 82°F | 58°F | 24% | 15% | 11 h 50 min |
- Normal high
- 87°FSeptember average
- Normal low
- 63°FSeptember average
- Precipitation
- 3.49 inmonth total
- Days with precipitation
- 70.01 inch or more
- Days at 90°F or more
- 9
- 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
- 24
- Sunshine
- 80%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00003856; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Huntsville in September?
On a given September day the chance of 0.01 inch or more is 24% on average, highest around September 1 (26%). In all, 3.49 in falls on 7 days of a normal September, 1 of them with an inch or more.
In a normal September in Huntsville, 9 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00003856.
How humid and windy is Huntsville in September?
At 3 p.m. the normal temperature is 79°F with 46% relative humidity and a dew point of 56°F; at 6 a.m. it is 60°F with 89% humidity. The wind averages 6.1 mph, most often from the northeast in the afternoon.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 60°F | 56°F | 89% | 4.4 mph | 57% |
| 9 a.m. | 70°F | 58°F | 66% | 7.5 mph | 58% |
| noon | 77°F | 57°F | 50% | 8.4 mph | 45% |
| 3 p.m. | 79°F | 56°F | 46% | 8.4 mph | 48% |
| 6 p.m. | 71°F | 57°F | 62% | 5.7 mph | 63% |
| 9 p.m. | 65°F | 58°F | 78% | 4.9 mph | 76% |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00003856. 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 Huntsville?
The warmest September temperature on Huntsville's official record (since 1907) is 108°F, on September 7, 1925; the coldest is 37°F, on September 29, 1942. The wettest September brought 12.48 in (1906).
The September mean against the 1991-2020 normal of 74.9°F: 2021 72.6°F (−2.3), 2022 72.8°F (−2.1), 2023 74.8°F (−0.1), 2024 75.8°F (+0.9), 2025 76.1°F (+1.2), 2026 79.5°F (+4.6). 3 of 6 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 72.6°F | −2.3°F | 5.96 in |
| 2022 | 72.8°F | −2.1°F | 3.54 in |
| 2023 | 74.8°F | −0.1°F | 1.19 in |
| 2024 | 75.8°F | +0.9°F | 4.43 in |
| 2025 | 76.1°F | +1.2°F | 2.77 in |
| 2026 | 79.5°F | +4.6°F | 0.27 in |
Source: records: ACIS, NWS threaded record HSVthr; recent months: ACIS, station USW00003856. Records and recent months use complete months only.
How does September in Huntsville compare across Alabama?
Across the 80 places PlainClimate covers in Alabama, September normal highs run from 81°F in Valley Head to 90°F in Eufaula; Huntsville's is 87°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.