Jacksonville, FL weather in September
In September, Jacksonville sees highs around 87°F and lows around 71°F: warm and oppressively humid, with frequent rain. There are about 12 days with rain.
- Normal high
- 87°F
- Normal low
- 71°F
- Wet days
- 12
- 7.6 in total
- Muggy days
- 27
- dew point 65°F+
How September changes from start to finish
| September 1 | September 30 | |
|---|---|---|
| Normal high | 89°F | 85°F |
| Normal low | 73°F | 67°F |
| Chance of a wet day | 45% | 36% |
| Sunrise / sunset | 7:03 am / 7:49 pm | 7:19 am / 7:13 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 (Eastern Time).
A typical September day
- 6 am75°Fdew point 71°F
- 9 am80°Fdew point 71°F
- Noon85°Fdew point 70°F
- 3 pm86°Fdew point 70°F
- 6 pm82°Fdew point 70°F
- 9 pm79°Fdew point 71°F
NOAA hourly normals (local standard time) from Jacksonville NAS (7 mi away); average wind 8 mph.
What kind of days to expect
- Comfortable dayshigh 65-80°F and dew point under 60°F0 of 30
- Hot dayshigh 90°F or more9 of 30
- Muggy daysdaily mean dew point 65°F or more27 of 30
- Wet daysat least 0.01 in of rain or melted snow12 of 30
- Notable rainat least 0.10 in8 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 7.6 in; a dry September brings about 5.2 in and a wet one about 9.3 in (25th and 75th percentiles). About 4 days bring half an inch or more, and about 2 an inch or more.
How September varies from year to year
- Warmest September, 1991-20202018: average high 91°F
- Coolest September2001: average high 83°F
- Wettest September2004: 16.3 in
- Driest September2019: 2.4 in
- Highest reading98°F (September 5, 1999)
- Lowest reading52°F (September 30, 2009)
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 | 91°F | 87°F | 81°F |
| Normal low | 73°F | 71°F | 62°F |
| Wet days | 15 | 12 | 8 |
| Comfortable days | 0 | 0 | 7 |
| Daylight | 13.2 h | 12.3 h | 11.4 h |
Highs change by -4°F from August and -6°F into October.
Nearby alternatives in September
- Drier: Tallahassee, FL157 mi · high 89°F · 9 wet days
How Jacksonville ranks in September
- Normal high114th warmest of 378 cities; 22nd of 23 in Florida
- Wet days347th driest of 378
- Comfortable days307th most of 342
What to pack for Jacksonville in September
- Light, breathable clothing – highs near 87°F and about 27 muggy days
- A rain jacket or umbrella – rain on about 12 days
Heating and cooling
September has 0 heating degree days and 416 cooling degree days (base 65°F), 10% of the year's total heating and cooling demand.
Questions
How hot is Jacksonville in September?
The normal high is 87°F and the normal low is 71°F. From 1991 to 2020 the hottest September reading was 98°F (September 5, 1999).
Does it rain a lot in Jacksonville in September?
About 12 days in September have at least 0.01 in of precipitation, and the normal total is 7.6 in. The wettest September in 1991-2020 was in 2004 (16.3 in); the driest was in 2019 (2.4 in).
Is September a good time to visit Jacksonville?
September ranks 9th of 12 months on our comfort score for Jacksonville (41 out of 100). It has almost no comfortable days and about 9 days at 90°F or hotter. The best months are February, March and November.
Where the numbers come from
- Temperature and rain: Jacksonville (USW00013889), 11 mi NNW of the city center, 33 ft . NOAA normals and daily records, 1991-2020.
- Snowfall and snow depth: Jacksonville Beach (USC00084366), 16 mi E of the city center, 10 ft . NOAA normals and daily records, 1991-2020.
- Frost dates and humidity and wind by hour: Jacksonville NAS (USW00093837), 6.9 mi S of the city center, 20 ft . NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: Jacksonville NAS (722065-93837), 6.9 mi S of the city center, 20 ft . Hourly observations, 1991-2020.
- Not available for this location: cloud cover (no station close enough or similar enough in elevation).