Jacksonville weather in September: Jacksonville, Florida: normal highs, lows, rain and records for September
Jacksonville in September has a normal high of 87°F and a normal low of 71°F, a daily mean of 79°F, falling from 89°F on the 1st to 85°F by the 30th. Measurable precipitation falls on 12 days in a normal September, 7.56 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 31°C and low of 21°C, 192 mm of precipitation in September.
- NOAA stationJacksonville International Airport
- Station IDUSW00013889
- Location30.48°N 81.70°W
- Elevation33 ft (10 m)
- From the center11 miles
- Population1,009,833
- Jan 66° 43°
- Feb 69° 46°
- Mar 74° 51°
- Apr 80° 56°
- May 86° 64°
- Jun 90° 71°
- Jul 92° 73°
- Aug 91° 73°
- Sep 87° 71°
- Oct 81° 62°
- Nov 73° 51°
- Dec 68° 46°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Jacksonville in September?
The normal high is 87°F and the normal low 71°F, for a daily mean of 78.8°F. September is 3.3°F cooler than August and 7.6°F warmer than October. September is the 4th warmest month of the year in Jacksonville and the 2nd wettest. Across the month the normal high falls 4°F, from 89°F on September 1 to 85°F on September 30. From one year to the next September's mean temperature typically moves about 1.3°F either way (NOAA's standard deviation), so roughly two Septembers in three average between 78°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 46%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 89°F | 73°F | 46% | 32% |
| September 8 | 88°F | 72°F | 44% | 31% |
| September 15 | 87°F | 71°F | 42% | 29% |
| September 22 | 86°F | 70°F | 39% | 27% |
| September 30 | 85°F | 67°F | 35% | 23% |
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 | 89°F | 73°F | 46% | 32% | 12 h 50 min |
| September 2 | 89°F | 73°F | 46% | 32% | 12 h 50 min |
| September 3 | 89°F | 72°F | 46% | 32% | 12 h 50 min |
| September 4 | 89°F | 72°F | 45% | 31% | 12 h 40 min |
| September 5 | 89°F | 72°F | 45% | 31% | 12 h 40 min |
| September 6 | 89°F | 72°F | 45% | 31% | 12 h 40 min |
| September 7 | 89°F | 72°F | 45% | 31% | 12 h 40 min |
| September 8 | 88°F | 72°F | 44% | 31% | 12 h 40 min |
| September 9 | 88°F | 72°F | 44% | 31% | 12 h 30 min |
| September 10 | 88°F | 72°F | 44% | 30% | 12 h 30 min |
| September 11 | 88°F | 72°F | 43% | 30% | 12 h 30 min |
| September 12 | 88°F | 71°F | 43% | 30% | 12 h 30 min |
| September 13 | 88°F | 71°F | 43% | 30% | 12 h 30 min |
| September 14 | 88°F | 71°F | 42% | 29% | 12 h 30 min |
| September 15 | 87°F | 71°F | 42% | 29% | 12 h 20 min |
| September 16 | 87°F | 71°F | 41% | 29% | 12 h 20 min |
| September 17 | 87°F | 71°F | 41% | 28% | 12 h 20 min |
| September 18 | 87°F | 70°F | 41% | 28% | 12 h 20 min |
| September 19 | 87°F | 70°F | 40% | 28% | 12 h 20 min |
| September 20 | 87°F | 70°F | 40% | 27% | 12 h 10 min |
| September 21 | 86°F | 70°F | 39% | 27% | 12 h 10 min |
| September 22 | 86°F | 70°F | 39% | 27% | 12 h 10 min |
| September 23 | 86°F | 69°F | 38% | 26% | 12 h 10 min |
| September 24 | 86°F | 69°F | 38% | 26% | 12 h 10 min |
| September 25 | 86°F | 69°F | 37% | 25% | 12 h 10 min |
| September 26 | 86°F | 69°F | 37% | 25% | 12 h |
| September 27 | 85°F | 68°F | 36% | 25% | 12 h |
| September 28 | 85°F | 68°F | 36% | 24% | 12 h |
| September 29 | 85°F | 68°F | 35% | 24% | 12 h |
| September 30 | 85°F | 67°F | 35% | 23% | 12 h |
- Normal high
- 87°FSeptember average
- Normal low
- 71°FSeptember average
- Precipitation
- 7.56 inmonth total
- Days with precipitation
- 120.01 inch or more
- Days at 90°F or more
- 9
- 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
- 78%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00013889; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Jacksonville in September?
On a given September day the chance of 0.01 inch or more is 41% on average, highest around September 1 (46%). In all, 7.56 in falls on 12 days of a normal September, 2 of them with an inch or more.
In a normal September in Jacksonville, 9 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00013889.
How humid and windy is Jacksonville in September?
At 3 p.m. the normal temperature is 82°F with 63% relative humidity and a dew point of 68°F; at 6 a.m. it is 69°F with 94% humidity. The wind averages 6.7 mph, most often from the east-northeast in the afternoon. A dew point of 65°F or more feels muggy to most people.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 69°F | 67°F | 94% | 4.1 mph | 38% |
| 9 a.m. | 76°F | 69°F | 79% | 7.6 mph | 37% |
| noon | 81°F | 68°F | 64% | 9.9 mph | – |
| 3 p.m. | 82°F | 68°F | 63% | 10.7 mph | 22% |
| 6 p.m. | 77°F | 69°F | 76% | 8.2 mph | 34% |
| 9 p.m. | 73°F | 69°F | 88% | 5.1 mph | 45% |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00013889. 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 Jacksonville?
The warmest September temperature on Jacksonville's official record (since 1871) is 99°F, on September 3, 1912; the coldest is 48°F, on September 20, 1981. The wettest September brought 21.79 in (1908).
The September mean against the 1991-2020 normal of 78.8°F: 2021 77.9°F (−0.9), 2022 78.0°F (−0.8), 2023 78.3°F (−0.5), 2024 79.7°F (+0.9), 2025 78.0°F (−0.8), 2026 79.6°F (+0.8). 2 of 6 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 77.9°F | −0.9°F | 5.11 in |
| 2022 | 78.0°F | −0.8°F | 5.53 in |
| 2023 | 78.3°F | −0.5°F | 9.00 in |
| 2024 | 79.7°F | +0.9°F | 13.53 in |
| 2025 | 78.0°F | −0.8°F | 2.74 in |
| 2026 | 79.6°F | +0.8°F | 4.29 in |
Source: records: ACIS, NWS threaded record JAXthr; recent months: ACIS, station USW00013889. Records and recent months use complete months only.
How does September in Jacksonville compare across Florida?
Across the 106 places PlainClimate covers in Florida, September normal highs run from 86°F in Jacksonville Beach to 92°F in Plant City; Jacksonville's is 87°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.
Other months and places
- Jacksonville in August91°F by day, 73°F at night
- Jacksonville in October81°F by day, 62°F at night
- Jacksonville through the yearEvery month, frost dates, records and recent years
- Florida in SeptemberThe statewide normal and the warmest and coolest places
- Plant City: Florida's warmest Septembernormal high 92°F