Mobile weather in September: Mobile, Alabama: normal highs, lows, rain and records for September
Mobile in September has a normal high of 88°F and a normal low of 69°F, a daily mean of 78°F, falling from 90°F on the 1st to 85°F by the 30th. Measurable precipitation falls on 9 days in a normal September, 5.30 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 31°C and low of 20°C, 135 mm of precipitation in September.
- NOAA stationMobile Regional Airport
- Station IDUSW00013894
- Location30.68°N 88.24°W
- Elevation208 ft (63 m)
- From the center8 miles
- Population201,367
- Jan 62° 41°
- Feb 66° 44°
- Mar 72° 50°
- Apr 78° 56°
- May 85° 64°
- Jun 89° 71°
- Jul 91° 73°
- Aug 91° 73°
- Sep 88° 69°
- Oct 80° 58°
- Nov 70° 48°
- Dec 64° 43°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Mobile in September?
The normal high is 88°F and the normal low 69°F, for a daily mean of 78.1°F. September is 3.8°F cooler than August and 9.1°F warmer than October. September is the 4th warmest month of the year in Mobile and the 9th wettest. Across the month the normal high falls 5°F, from 90°F on September 1 to 85°F on September 30. From one year to the next September's mean temperature typically moves about 1.7°F either way (NOAA's standard deviation), so roughly two Septembers in three average between 76°F and 80°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 36%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 90°F | 72°F | 36% | 25% |
| September 8 | 89°F | 71°F | 33% | 22% |
| September 15 | 88°F | 69°F | 31% | 21% |
| September 22 | 87°F | 67°F | 29% | 19% |
| September 30 | 85°F | 65°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 | 90°F | 72°F | 36% | 25% | 12 h 50 min |
| September 2 | 90°F | 72°F | 36% | 24% | 12 h 50 min |
| September 3 | 90°F | 72°F | 35% | 24% | 12 h 50 min |
| September 4 | 89°F | 71°F | 35% | 24% | 12 h 40 min |
| September 5 | 89°F | 71°F | 35% | 23% | 12 h 40 min |
| September 6 | 89°F | 71°F | 34% | 23% | 12 h 40 min |
| September 7 | 89°F | 71°F | 34% | 23% | 12 h 40 min |
| September 8 | 89°F | 71°F | 33% | 22% | 12 h 40 min |
| September 9 | 89°F | 71°F | 33% | 22% | 12 h 30 min |
| September 10 | 89°F | 70°F | 33% | 22% | 12 h 30 min |
| September 11 | 88°F | 70°F | 32% | 22% | 12 h 30 min |
| September 12 | 88°F | 70°F | 32% | 21% | 12 h 30 min |
| September 13 | 88°F | 70°F | 32% | 21% | 12 h 30 min |
| September 14 | 88°F | 70°F | 31% | 21% | 12 h 30 min |
| September 15 | 88°F | 69°F | 31% | 21% | 12 h 20 min |
| September 16 | 88°F | 69°F | 31% | 21% | 12 h 20 min |
| September 17 | 87°F | 69°F | 31% | 20% | 12 h 20 min |
| September 18 | 87°F | 69°F | 30% | 20% | 12 h 20 min |
| September 19 | 87°F | 68°F | 30% | 20% | 12 h 20 min |
| September 20 | 87°F | 68°F | 30% | 20% | 12 h 10 min |
| September 21 | 87°F | 68°F | 29% | 20% | 12 h 10 min |
| September 22 | 87°F | 67°F | 29% | 19% | 12 h 10 min |
| September 23 | 86°F | 67°F | 29% | 19% | 12 h 10 min |
| September 24 | 86°F | 67°F | 28% | 19% | 12 h 10 min |
| September 25 | 86°F | 66°F | 28% | 18% | 12 h 10 min |
| September 26 | 86°F | 66°F | 27% | 18% | 12 h |
| September 27 | 85°F | 66°F | 27% | 18% | 12 h |
| September 28 | 85°F | 65°F | 27% | 18% | 12 h |
| September 29 | 85°F | 65°F | 26% | 17% | 12 h |
| September 30 | 85°F | 65°F | 26% | 17% | 12 h |
- Normal high
- 88°FSeptember average
- Normal low
- 69°FSeptember average
- Precipitation
- 5.30 inmonth total
- Days with precipitation
- 90.01 inch or more
- Days at 90°F or more
- 12
- Daylight
- 12 h 50 min to 12 hSeptember 1 to September 30
- Days at 70°F or more
- 30
- Days at 80°F or more
- 28
- Sunshine
- 83%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00013894; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Mobile in September?
On a given September day the chance of 0.01 inch or more is 31% on average, highest around September 1 (36%). In all, 5.30 in falls on 9 days of a normal September, 2 of them with an inch or more.
In a normal September in Mobile, 12 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00013894.
How humid and windy is Mobile in September?
At 3 p.m. the normal temperature is 82°F with 52% relative humidity and a dew point of 63°F; at 6 a.m. it is 66°F with 89% humidity. The wind averages 7.0 mph, most often from the northeast in the afternoon.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 66°F | 63°F | 89% | 5.7 mph | 54% |
| 9 a.m. | 76°F | 64°F | 68% | 8.7 mph | 62% |
| noon | 81°F | 63°F | 55% | 9.1 mph | 39% |
| 3 p.m. | 82°F | 63°F | 52% | 9.2 mph | 47% |
| 6 p.m. | 75°F | 65°F | 71% | 6.4 mph | 58% |
| 9 p.m. | 70°F | 65°F | 82% | 5.5 mph | 72% |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00013894. 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 Mobile?
The warmest September temperature on Mobile's official record (since 1872) is 103°F, on September 5, 1925; the coldest is 42°F, on September 29, 1967. The wettest September brought 24.13 in (1998).
The September mean against the 1991-2020 normal of 78.1°F: 2021 76.2°F (−1.9), 2022 78.8°F (+0.7), 2023 81.4°F (+3.3), 2024 80.1°F (+2.0), 2025 78.7°F (+0.6), 2026 81.0°F (+3.0). 5 of 6 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 76.2°F | −1.9°F | 7.88 in |
| 2022 | 78.8°F | +0.7°F | 1.22 in |
| 2023 | 81.4°F | +3.3°F | 2.12 in |
| 2024 | 80.1°F | +2.0°F | 4.85 in |
| 2025 | 78.7°F | +0.6°F | 1.33 in |
| 2026 | 81.0°F | +3.0°F | 3.28 in |
Source: records: ACIS, NWS threaded record MOBthr; recent months: ACIS, station USW00013894. Records and recent months use complete months only.
How does September in Mobile 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; Mobile's is 88°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.