Mobile, AL weather in September
September in Mobile: hot and oppressively humid, with frequent rain. Highs 89°F, lows 72°F, about 11 wet days.
- Normal high
- 89°F
- Normal low
- 72°F
- Wet days
- 11
- 6.6 in total
- Muggy days
- 24
- dew point 65°F+
How September changes from start to finish
| September 1 | September 30 | |
|---|---|---|
| Normal high | 91°F | 86°F |
| Normal low | 74°F | 68°F |
| Chance of a wet day | 42% | 30% |
| Sunrise / sunset | 6:28 am / 7:15 pm | 6:45 am / 6:39 pm |
| Daylight | 12.8 h | 11.9 h |
Chance of a wet day: average for the first and last 7 days of the month. Times are local clock time (Central Time).
A typical September day
- 6 am70°Fdew point 67°F
- 9 am80°Fdew point 69°F
- Noon85°Fdew point 68°F
- 3 pm85°Fdew point 67°F
- 6 pm79°Fdew point 69°F
- 9 pm74°Fdew point 69°F
NOAA hourly normals (local standard time) from Mobile (12 mi away); average wind 6 mph; clear or few clouds in 43% of daytime hours, mostly cloudy or overcast in 30%.
What kind of days to expect
- Comfortable dayshigh 65-80°F and dew point under 60°F0 of 30
- Beach dayshigh 80-95°F, under 0.05 in of rain, afternoon wind under 15 mph20 of 30
- Hot dayshigh 90°F or more13 of 30
- Muggy daysdaily mean dew point 65°F or more24 of 30
- Wet daysat least 0.01 in of rain or melted snow11 of 30
- Notable rainat least 0.10 in7 of 30
- Freezing nightslow 32°F or below0 of 30
Average days per September, counted from daily records for each year 1991-2020.
Rain in September
Normal precipitation is 6.6 in; a dry September brings about 3.1 in and a wet one about 8.1 in (25th and 75th percentiles). About 3 days bring half an inch or more, and about 2 an inch or more.
How September varies from year to year
- Warmest September, 1991-20202019: average high 94°F
- Coolest September2001: average high 84°F
- Wettest September1998: 24.1 in
- Driest September2019: 0.07 in
- Highest reading101°F (September 4, 2019)
- Lowest reading48°F (September 27, 2001)
From the station's daily records with NOAA quality flags removed; most recent date shown when a reading repeats.
September compared with August and October
| August | September | October | |
|---|---|---|---|
| Normal high | 92°F | 89°F | 81°F |
| Normal low | 75°F | 72°F | 61°F |
| Wet days | 15 | 11 | 7 |
| Comfortable days | 0 | 0 | 10 |
| Daylight | 13.2 h | 12.3 h | 11.4 h |
Highs change by -3°F from August and -8°F into October.
Nearby alternatives in September
- Drier: Montgomery, AL155 mi · high 89°F · 7 wet days
How Mobile ranks in September
- Normal high76th warmest of 378 cities; 2nd of 6 in Alabama
- Wet days332nd driest of 378
- Comfortable days301st most of 342
What to pack for Mobile in September
- Light, breathable clothing – highs near 89°F and about 24 muggy days
- A rain jacket or umbrella – rain on about 11 days
- A swimsuit – about 20 beach days
Heating and cooling
September has 0 heating degree days and 459 cooling degree days (base 65°F), 11% of the year's total heating and cooling demand.
Questions
How hot is Mobile in September?
The normal high is 89°F and the normal low is 72°F. From 1991 to 2020 the hottest September reading was 101°F (September 4, 2019).
Does it rain a lot in Mobile in September?
About 11 days in September have at least 0.01 in of precipitation, and the normal total is 6.6 in. The wettest September in 1991-2020 was in 1998 (24.1 in); the driest was in 2019 (0.07 in).
Is September a good time to visit Mobile?
September ranks 10th of 12 months on our comfort score for Mobile (39 out of 100). It has almost no comfortable days and about 13 days at 90°F or hotter. The best months are March, April and November.
Where the numbers come from
- Temperature and frost dates: Mobile Downtown Airport (USW00013838), 4.9 mi SSW of the city center, 26 ft . NOAA normals and daily records, 1991-2020.
- Rain: Fairhope 2 Ne (USC00012813), 14 mi SE of the city center, 23 ft . NOAA normals and daily records, 1991-2020.
- Snowfall, snow depth, humidity and wind by hour and cloud cover: Mobile (USW00013894), 12 mi W of the city center, 208 ft (199 ft higher than the city). NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: Mobile Downtown Airport (722235-13838), 5.6 mi SSW of the city center, 16 ft . Hourly observations, 1991-2020.