Jacksonville weather in September
In September, Jacksonville sees average daytime highs of 86°F and overnight lows near 72°F, with 4.8 in of rain across 15.9 wet days and about 12.2 hours of daylight. It is the 4th-warmest and 4th-wettest month of the year here.
Highs ease over the month, from about 88°F in the first days to 84°F by the end. The sky is clear or mostly clear about 24% of the time in September, and the air most often feels oppressive.
Daylight stretches from about 12 h 36 min at the start of September to 11 h 42 min by month's end. Set against the rest of the year, September is Jacksonville's 9th-clearest and 9th-windiest month. For the whole year in context, see Jacksonville's year-round climate.
- Daytime high
- 86°
- 4th warmest
- Overnight low
- 72°
- 9th coldest
- Rainfall
- 4.8 in
- 15.9 wet days
- Daylight
- 12 h 12 min
- 6:16 AM – 6:26 PM
- Cloud cover
- 63%
- 9th clearest
- Wind
- 6 mph
- 9th windiest
- Solar energy
- 4.55 kWh/m²
- Travel score
- 4.2
- out of 10
Jacksonville is city in Duval County, and largest city in State of Florida, United States.
- Density
- 446/km²
- people per km²
- Founded
- 1791
Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.
Temperature in September
Highs ease over the month, from about 88°F in the first days to 84°F by the end.
A typical September day in Jacksonville reaches about 86°F in the afternoon and slips back to 72°F overnight — a 14°F spread between the day's warmth and the night's chill. On most days the high lands between 81°F and 91°F. Set against its neighbours, September runs about 3°F cooler than August and about 6°F warmer than October.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°F) | 88 | 88 | 88 | 88 | 87 | 87 | 87 | 87 | 87 | 87 | 87 | 87 | 87 | 87 | 86 | 86 | 86 | 86 | 86 | 86 | 85 | 85 | 85 | 85 | 85 | 85 | 84 | 84 | 84 | 84 |
| Avg low (°F) | 74 | 73 | 73 | 73 | 73 | 73 | 73 | 73 | 73 | 73 | 72 | 72 | 72 | 72 | 72 | 72 | 71 | 71 | 71 | 71 | 71 | 71 | 70 | 70 | 70 | 70 | 69 | 69 | 69 | 69 |
| Avg high (°F) | Avg low (°F) | |
|---|---|---|
| 1 | 88 | 74 |
| 2 | 88 | 73 |
| 3 | 88 | 73 |
| 4 | 88 | 73 |
| 5 | 87 | 73 |
| 6 | 87 | 73 |
| 7 | 87 | 73 |
| 8 | 87 | 73 |
| 9 | 87 | 73 |
| 10 | 87 | 73 |
| 11 | 87 | 72 |
| 12 | 87 | 72 |
| 13 | 87 | 72 |
| 14 | 87 | 72 |
| 15 | 86 | 72 |
| 16 | 86 | 72 |
| 17 | 86 | 71 |
| 18 | 86 | 71 |
| 19 | 86 | 71 |
| 20 | 86 | 71 |
| 21 | 85 | 71 |
| 22 | 85 | 71 |
| 23 | 85 | 70 |
| 24 | 85 | 70 |
| 25 | 85 | 70 |
| 26 | 85 | 70 |
| 27 | 84 | 69 |
| 28 | 84 | 69 |
| 29 | 84 | 69 |
| 30 | 84 | 69 |
How September really feels in Jacksonville
Once humidity and wind are folded in, September averages 22 days that feel above 90°F and 0 that feel at or below 32°F — the comfort signal a plain temperature reading hides.
The story in September is heat — humidity pushes the afternoon "feels like" well above the raw temperature.
Jacksonville weather by month
How September compares with the rest of the year at a glance. September is the 4th-warmest and 4th-wettest month here — the current month is highlighted below.
| Month | High / Low (°F) | Rainfall (inches) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 65° / 45° | 2.6 | 7.3 | 10.3 | 6.5 |
| Feb | 69° / 48° | 2.5 | 6.9 | 10.9 | 6.8 |
| Mar | 74° / 52° | 3.0 | 7.5 | 11.8 | 7.4 |
| Apr | 80° / 59° | 2.3 | 6.9 | 12.7 | 7.2 |
| May | 85° / 66° | 2.6 | 8.9 | 13.5 | 5.4 |
| Jun | 89° / 72° | 5.1 | 18.9 | 13.9 | 3.4 |
| Jul | 90° / 74° | 4.9 | 20.4 | 13.8 | 2.9 |
| Aug | 89° / 74° | 5.5 | 21.6 | 13.1 | 2.9 |
| Sep | 86° / 72° | 4.8 | 15.9 | 12.2 | 4.2 |
| Oct | 80° / 63° | 2.8 | 9.2 | 11.3 | 6.7 |
| Nov | 73° / 53° | 1.6 | 6 | 10.5 | 7.5 |
| Dec | 67° / 48° | 2.3 | 6.5 | 10.1 | 6.8 |
Cloud cover in September
The sky is clear or mostly clear about 24% of the time in September.
Beyond those clear spells, partly cloudy skies cover about 22% of September, with mostly cloudy or overcast conditions the remaining 54%. Skies tend to open up as the month goes on.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 41 | 41 | 41 | 41 | 41 | 42 | 43 | 44 | 44 | 45 | 46 | 47 | 47 | 47 | 48 | 48 | 49 | 49 | 48 | 48 | 49 | 48 | 49 | 47 | 48 | 47 | 48 | 46 | 47 | 47 |
| Cloudier (%) | 59 | 59 | 59 | 59 | 59 | 58 | 57 | 56 | 56 | 55 | 54 | 53 | 53 | 53 | 52 | 52 | 51 | 51 | 52 | 52 | 51 | 52 | 51 | 53 | 52 | 53 | 52 | 54 | 53 | 53 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 41 | 59 |
| 2 | 41 | 59 |
| 3 | 41 | 59 |
| 4 | 41 | 59 |
| 5 | 41 | 59 |
| 6 | 42 | 58 |
| 7 | 43 | 57 |
| 8 | 44 | 56 |
| 9 | 44 | 56 |
| 10 | 45 | 55 |
| 11 | 46 | 54 |
| 12 | 47 | 53 |
| 13 | 47 | 53 |
| 14 | 47 | 53 |
| 15 | 48 | 52 |
| 16 | 48 | 52 |
| 17 | 49 | 51 |
| 18 | 49 | 51 |
| 19 | 48 | 52 |
| 20 | 48 | 52 |
| 21 | 49 | 51 |
| 22 | 48 | 52 |
| 23 | 49 | 51 |
| 24 | 47 | 53 |
| 25 | 48 | 52 |
| 26 | 47 | 53 |
| 27 | 48 | 52 |
| 28 | 46 | 54 |
| 29 | 47 | 53 |
| 30 | 47 | 53 |
Chance of precipitation in September
Jacksonville gets around 4.8 in of rain over 15.9 wet days in September. The line is the day-by-day chance of measurable precipitation.
Day to day, the chance of measurable rain averages around 53% and peaks near 63% on the wettest days. The odds ease toward the end of the month.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain chance (%) | 63 | 63 | 62 | 61 | 61 | 60 | 59 | 58 | 58 | 57 | 56 | 55 | 55 | 54 | 53 | 53 | 52 | 51 | 51 | 50 | 49 | 49 | 48 | 48 | 47 | 47 | 47 | 46 | 46 | 45 |
| Rain chance (%) | |
|---|---|
| 1 | 63 |
| 2 | 63 |
| 3 | 62 |
| 4 | 61 |
| 5 | 61 |
| 6 | 60 |
| 7 | 59 |
| 8 | 58 |
| 9 | 58 |
| 10 | 57 |
| 11 | 56 |
| 12 | 55 |
| 13 | 55 |
| 14 | 54 |
| 15 | 53 |
| 16 | 53 |
| 17 | 52 |
| 18 | 51 |
| 19 | 51 |
| 20 | 50 |
| 21 | 49 |
| 22 | 49 |
| 23 | 48 |
| 24 | 48 |
| 25 | 47 |
| 26 | 47 |
| 27 | 47 |
| 28 | 46 |
| 29 | 46 |
| 30 | 45 |
Humidity in September
Most of September feels oppressive — the stacked bands show each day's mix of comfort levels, read off the dew point.
By dew point, September lands in the oppressive band about 62% of days. Sticky, muggy-or-worse air turns up on roughly 90% of them.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dry (%) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 1 | 2 | 2 | 3 | 3 | 3 | 4 | 4 |
| Comfortable (%) | 0 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 2 | 2 | 2 | 2 | 2 | 2 | 3 | 3 | 3 | 4 | 4 | 5 | 5 | 5 | 6 | 6 | 6 |
| Humid (%) | 2 | 3 | 3 | 3 | 4 | 4 | 4 | 5 | 5 | 5 | 5 | 5 | 6 | 6 | 6 | 7 | 7 | 7 | 8 | 8 | 8 | 9 | 10 | 10 | 11 | 12 | 13 | 13 | 14 | 14 |
| Muggy (%) | 12 | 13 | 14 | 15 | 16 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 23 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 23 | 24 | 24 | 24 |
| Oppressive (%) | 73 | 72 | 71 | 70 | 69 | 69 | 69 | 67 | 67 | 66 | 66 | 65 | 64 | 63 | 62 | 61 | 62 | 62 | 61 | 61 | 60 | 59 | 58 | 57 | 55 | 53 | 53 | 52 | 50 | 49 |
| Miserable (%) | 13 | 12 | 11 | 11 | 10 | 10 | 9 | 9 | 8 | 8 | 7 | 7 | 6 | 6 | 6 | 6 | 5 | 5 | 5 | 4 | 4 | 4 | 3 | 3 | 3 | 3 | 3 | 2 | 2 | 2 |
| Dry (%) | Comfortable (%) | Humid (%) | Muggy (%) | Oppressive (%) | Miserable (%) | |
|---|---|---|---|---|---|---|
| 1 | 0 | 0 | 2 | 12 | 73 | 13 |
| 2 | 0 | 0 | 3 | 13 | 72 | 12 |
| 3 | 0 | 1 | 3 | 14 | 71 | 11 |
| 4 | 0 | 1 | 3 | 15 | 70 | 11 |
| 5 | 0 | 1 | 4 | 16 | 69 | 10 |
| 6 | 0 | 1 | 4 | 16 | 69 | 10 |
| 7 | 0 | 1 | 4 | 17 | 69 | 9 |
| 8 | 0 | 1 | 5 | 18 | 67 | 9 |
| 9 | 0 | 1 | 5 | 19 | 67 | 8 |
| 10 | 0 | 1 | 5 | 20 | 66 | 8 |
| 11 | 0 | 1 | 5 | 21 | 66 | 7 |
| 12 | 0 | 1 | 5 | 22 | 65 | 7 |
| 13 | 0 | 1 | 6 | 23 | 64 | 6 |
| 14 | 0 | 2 | 6 | 23 | 63 | 6 |
| 15 | 0 | 2 | 6 | 24 | 62 | 6 |
| 16 | 0 | 2 | 7 | 24 | 61 | 6 |
| 17 | 0 | 2 | 7 | 24 | 62 | 5 |
| 18 | 0 | 2 | 7 | 24 | 62 | 5 |
| 19 | 0 | 2 | 8 | 24 | 61 | 5 |
| 20 | 0 | 3 | 8 | 24 | 61 | 4 |
| 21 | 1 | 3 | 8 | 24 | 60 | 4 |
| 22 | 1 | 3 | 9 | 24 | 59 | 4 |
| 23 | 1 | 4 | 10 | 24 | 58 | 3 |
| 24 | 2 | 4 | 10 | 24 | 57 | 3 |
| 25 | 2 | 5 | 11 | 24 | 55 | 3 |
| 26 | 3 | 5 | 12 | 24 | 53 | 3 |
| 27 | 3 | 5 | 13 | 23 | 53 | 3 |
| 28 | 3 | 6 | 13 | 24 | 52 | 2 |
| 29 | 4 | 6 | 14 | 24 | 50 | 2 |
| 30 | 4 | 6 | 14 | 24 | 49 | 2 |
Wind in September
Winds average 6 mph in September.
Across September, daily wind ranges from about 6 mph on the calmest days to 6 mph at its breeziest. It stays fairly steady from day to day.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wind speed (mph) | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 |
| Feels | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm |
| Wind speed (mph) | Feels | |
|---|---|---|
| 1 | 6 | calm |
| 2 | 6 | calm |
| 3 | 6 | calm |
| 4 | 6 | calm |
| 5 | 6 | calm |
| 6 | 6 | calm |
| 7 | 6 | calm |
| 8 | 6 | calm |
| 9 | 6 | calm |
| 10 | 6 | calm |
| 11 | 6 | calm |
| 12 | 6 | calm |
| 13 | 6 | calm |
| 14 | 6 | calm |
| 15 | 6 | calm |
| 16 | 6 | calm |
| 17 | 6 | calm |
| 18 | 6 | calm |
| 19 | 6 | calm |
| 20 | 6 | calm |
| 21 | 6 | calm |
| 22 | 6 | calm |
| 23 | 6 | calm |
| 24 | 6 | calm |
| 25 | 6 | calm |
| 26 | 6 | calm |
| 27 | 6 | calm |
| 28 | 6 | calm |
| 29 | 6 | calm |
| 30 | 6 | calm |
Sunrise & sunset in September
Daylight runs from about 12 h 36 min at the start of September to 11 h 42 min by month's end. The lit band spans sunrise to sunset each day.
Days shrink by about 54 minutes over September. Sunrise moves from 6:07 AM to 6:24 AM, and sunset from 6:46 PM to 6:08 PM.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 12.6 | 12.6 | 12.6 | 12.6 | 12.5 | 12.5 | 12.5 | 12.4 | 12.4 | 12.4 | 12.3 | 12.3 | 12.3 | 12.2 | 12.2 | 12.2 | 12.1 | 12.1 | 12.1 | 12.1 | 12.0 | 12.0 | 12.0 | 11.9 | 11.9 | 11.9 | 11.8 | 11.8 | 11.8 | 11.7 |
| Sunrise (AM) | 6:07 | 6:08 | 6:08 | 6:09 | 6:09 | 6:10 | 6:10 | 6:11 | 6:12 | 6:12 | 6:13 | 6:13 | 6:14 | 6:14 | 6:15 | 6:16 | 6:16 | 6:17 | 6:17 | 6:18 | 6:18 | 6:19 | 6:20 | 6:20 | 6:21 | 6:21 | 6:22 | 6:22 | 6:23 | 6:24 |
| Sunset (PM) | 6:46 | 6:44 | 6:43 | 6:42 | 6:41 | 6:39 | 6:38 | 6:37 | 6:36 | 6:34 | 6:33 | 6:32 | 6:30 | 6:29 | 6:28 | 6:26 | 6:25 | 6:24 | 6:22 | 6:21 | 6:20 | 6:18 | 6:17 | 6:16 | 6:15 | 6:13 | 6:12 | 6:11 | 6:09 | 6:08 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 12.6 | 6:07 | 6:46 |
| 2 | 12.6 | 6:08 | 6:44 |
| 3 | 12.6 | 6:08 | 6:43 |
| 4 | 12.6 | 6:09 | 6:42 |
| 5 | 12.5 | 6:09 | 6:41 |
| 6 | 12.5 | 6:10 | 6:39 |
| 7 | 12.5 | 6:10 | 6:38 |
| 8 | 12.4 | 6:11 | 6:37 |
| 9 | 12.4 | 6:12 | 6:36 |
| 10 | 12.4 | 6:12 | 6:34 |
| 11 | 12.3 | 6:13 | 6:33 |
| 12 | 12.3 | 6:13 | 6:32 |
| 13 | 12.3 | 6:14 | 6:30 |
| 14 | 12.2 | 6:14 | 6:29 |
| 15 | 12.2 | 6:15 | 6:28 |
| 16 | 12.2 | 6:16 | 6:26 |
| 17 | 12.1 | 6:16 | 6:25 |
| 18 | 12.1 | 6:17 | 6:24 |
| 19 | 12.1 | 6:17 | 6:22 |
| 20 | 12.1 | 6:18 | 6:21 |
| 21 | 12.0 | 6:18 | 6:20 |
| 22 | 12.0 | 6:19 | 6:18 |
| 23 | 12.0 | 6:20 | 6:17 |
| 24 | 11.9 | 6:20 | 6:16 |
| 25 | 11.9 | 6:21 | 6:15 |
| 26 | 11.9 | 6:21 | 6:13 |
| 27 | 11.8 | 6:22 | 6:12 |
| 28 | 11.8 | 6:22 | 6:11 |
| 29 | 11.8 | 6:23 | 6:09 |
| 30 | 11.7 | 6:24 | 6:08 |
Solar energy in September
Average shortwave solar energy reaching the ground each day in September, about 4.55 kWh/m².
For context, solar energy here swings from a low near 2.77 kWh/m² to a high of 6.31 kWh/m² in May across the year — September's 4.55 kWh/m² falls in the middle.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solar energy (kWh/m²) | 4.9 | 4.9 | 4.9 | 4.8 | 4.8 | 4.8 | 4.8 | 4.7 | 4.7 | 4.7 | 4.7 | 4.7 | 4.6 | 4.6 | 4.6 | 4.5 | 4.5 | 4.5 | 4.5 | 4.5 | 4.4 | 4.4 | 4.4 | 4.3 | 4.3 | 4.3 | 4.3 | 4.2 | 4.2 | 4.2 |
| Level | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| 1 | 4.9 | Bright |
| 2 | 4.9 | Bright |
| 3 | 4.9 | Bright |
| 4 | 4.8 | Bright |
| 5 | 4.8 | Bright |
| 6 | 4.8 | Bright |
| 7 | 4.8 | Bright |
| 8 | 4.7 | Bright |
| 9 | 4.7 | Bright |
| 10 | 4.7 | Bright |
| 11 | 4.7 | Bright |
| 12 | 4.7 | Bright |
| 13 | 4.6 | Bright |
| 14 | 4.6 | Bright |
| 15 | 4.6 | Bright |
| 16 | 4.5 | Bright |
| 17 | 4.5 | Bright |
| 18 | 4.5 | Bright |
| 19 | 4.5 | Bright |
| 20 | 4.5 | Bright |
| 21 | 4.4 | Bright |
| 22 | 4.4 | Bright |
| 23 | 4.4 | Bright |
| 24 | 4.3 | Bright |
| 25 | 4.3 | Bright |
| 26 | 4.3 | Bright |
| 27 | 4.3 | Bright |
| 28 | 4.2 | Bright |
| 29 | 4.2 | Bright |
| 30 | 4.2 | Bright |
Hazard calendar for Jacksonville
In September, Jacksonville sits inside its atlantic hurricane and rainy season season. The full year is below, with each hazard's peak months called out.
Jacksonville sits in the Atlantic hurricane belt; the season peaks August–October.
Jacksonville's rainy season runs May–October, when most of the year's rain falls.
Is September a good time to visit Jacksonville?
Our two travel scores rate September for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).
September is a reasonable time to visit Jacksonville for sightseeing.
What to pack for Jacksonville in September
From September's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In September, Jacksonville sees daytime highs around 86°F and nights near 72°F. Pack light clothes and rain gear. Worth having: sun protection. About 16 days see rain.
Sea temperature near Jacksonville in September
The nearest coast averages about 82°F in September — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea at the nearest coast (about 17 mi away) is warmest in August at about 82°F and coldest in February near 61°F.
It's comfortable for a long swim from Apr 13 to Nov 28 — about 7.6 months when the water holds above 68°F.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°F) | 62 | 61 | 63 | 69 | 75 | 80 | 82 | 82 | 82 | 78 | 70 | 65 |
| Comfort | Cool | Cool | Cool | Refreshing | Refreshing | Warm | Warm | Tropical | Warm | Warm | Refreshing | Cool |
| Sea temperature (°F) | Comfort | |
|---|---|---|
| Jan | 62 | Cool |
| Feb | 61 | Cool |
| Mar | 63 | Cool |
| Apr | 69 | Refreshing |
| May | 75 | Refreshing |
| Jun | 80 | Warm |
| Jul | 82 | Warm |
| Aug | 82 | Tropical |
| Sep | 82 | Warm |
| Oct | 78 | Warm |
| Nov | 70 | Refreshing |
| Dec | 65 | Cool |
UV index in Jacksonville in September
Clear-sky midday UV in September peaks around 8 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Jacksonville peaks around June 22 at about 10 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 19 at about 4 (moderate).
The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 4 | 6 | 7 | 7 | 8 | 11 | 10 | 10 | 8 | 6 | 5 | 3 |
| Level | Moderate | High | High | High | Very high | Extreme | Extreme | Very high | Very high | High | Moderate | Moderate |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 4 | Moderate |
| Feb | 6 | High |
| Mar | 7 | High |
| Apr | 7 | High |
| May | 8 | Very high |
| Jun | 11 | Extreme |
| Jul | 10 | Extreme |
| Aug | 10 | Very high |
| Sep | 8 | Very high |
| Oct | 6 | High |
| Nov | 5 | Moderate |
| Dec | 3 | Moderate |
Air quality in Jacksonville in September
Average fine-particle pollution (PM2.5) through the year — so you can see where September falls, not just the annual average.
Air quality in Jacksonville is worst in July — around 18 µg/m³ PM2.5 (moderate), about 2.4× the cleanest month (December, 7 µg/m³).
Modeled monthly averages (CAMS reanalysis, 2015–2024).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 9 | 13 | 12 | 13 | 14 | 16 | 18 | 16 | 12 | 8 | 8 | 7 |
| Level | Good | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Good | Good | Good | Good |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 9 | Good |
| Feb | 13 | Moderate |
| Mar | 12 | Moderate |
| Apr | 13 | Moderate |
| May | 14 | Moderate |
| Jun | 16 | Moderate |
| Jul | 18 | Moderate |
| Aug | 16 | Moderate |
| Sep | 12 | Good |
| Oct | 8 | Good |
| Nov | 8 | Good |
| Dec | 7 | Good |
Where is Jacksonville?
Jacksonville sits at 30.3°N, 81.7°W, 16 ft above sea level, in United States. The nearest listed city is Fruit Cove, 16 mi away.
Topography around Jacksonville
How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Jacksonville.
Within 2 miles, the terrain around Jacksonville has only modest variations in elevation — a maximum elevation change of 72 ft around an average of 20 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 154 ft; within 50 miles, only modest variations in elevation — a maximum elevation change of 308 ft.
The land around Jacksonville is covered by artificial surfaces (51%) and trees (23%) within 2 miles, trees (49%) and artificial surfaces (23%) within 10 miles, and trees (62%) and water (26%) within 50 miles.
United States travel facts
- Power plugs
- Type A / B
- 120 V · 60 Hz
- Prices
- ≈ 100% of US
- price level, 2025
- GDP per capita
- $90,027
- 2025
- Happiness
- 6.8 / 10
- World Happiness, 2025
- Safe drinking water
- 98%
- of population, 2024
- Homicide rate
- 5.8
- per 100k, 2023
- Road deaths
- 12.7
- per 100k/yr, 2019
- Income group
- High
- World Bank
- Religion
Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.
Data sources
Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Jacksonville (30.3322°, -81.6556°, elevation 16 ft), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. Tropical-cyclone seasons are the published climatological basin seasons (NOAA National Hurricane Center / regional warning centres). Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).