Jacksonville, FL weather in August
Jacksonville is hot and oppressively humid in August, with rain on most days: highs average 91°F and nights drop to about 73°F. Rain falls on about 15 days. This is the peak of the warm season in Jacksonville. Midday heat is the main thing to plan around.
- Normal high
- 91°F
- Normal low
- 73°F
- Wet days
- 15
- 6.9 in total
- Muggy days
- 31
- dew point 65°F+
How August changes from start to finish
| August 1 | August 31 | |
|---|---|---|
| Normal high | 92°F | 89°F |
| Normal low | 74°F | 73°F |
| Chance of a wet day | 48% | 47% |
| Sunrise / sunset | 6:45 am / 8:20 pm | 7:02 am / 7:51 pm |
| Daylight | 13.6 h | 12.8 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 August day
- 6 am78°Fdew point 73°F
- 9 am83°Fdew point 74°F
- Noon88°Fdew point 72°F
- 3 pm89°Fdew point 72°F
- 6 pm85°Fdew point 72°F
- 9 pm81°Fdew point 73°F
NOAA hourly normals (local standard time) from Jacksonville NAS (7 mi away); average wind 7 mph.
What kind of days to expect
- Comfortable dayshigh 65-80°F and dew point under 60°F0 of 31
- Hot dayshigh 90°F or more20 of 31
- Muggy daysdaily mean dew point 65°F or more31 of 31
- Wet daysat least 0.01 in of rain or melted snow15 of 31
- Notable rainat least 0.10 in10 of 31
- Freezing nightslow 32°F or below0 of 31
Average days per August, counted from daily records for each year 1991-2020.
Rain in August
Normal precipitation is 6.9 in; a dry August brings about 3.6 in and a wet one about 9.0 in (25th and 75th percentiles). About 4 days bring half an inch or more, and about 2 an inch or more.
How August varies from year to year
- Warmest August, 1991-20202011: average high 94°F
- Coolest August1996: average high 87°F
- Wettest August2008: 16.8 in
- Driest August2003: 1.8 in
- Highest reading102°F (August 1, 1999)
- Lowest reading63°F (August 9, 2002)
From the station's daily records with NOAA quality flags removed; most recent date shown when a reading repeats.
August compared with July and September
| July | August | September | |
|---|---|---|---|
| Normal high | 92°F | 91°F | 87°F |
| Normal low | 73°F | 73°F | 71°F |
| Wet days | 14 | 15 | 12 |
| Comfortable days | 0 | 0 | 0 |
| Daylight | 13.9 h | 13.2 h | 12.3 h |
Highs change by -1°F from July and -4°F into September.
Nearby alternatives in August
- Drier: Charleston, SC197 mi · high 86°F · 12 wet days
How Jacksonville ranks in August
- Normal high115th warmest of 378 cities; 11th of 23 in Florida
- Wet days355th driest of 378
- Comfortable days277th most of 341
What to pack for Jacksonville in August
- Light, breathable clothing – highs near 91°F and about 31 muggy days
- A rain jacket or umbrella – rain on about 15 days
Heating and cooling
August has 0 heating degree days and 530 cooling degree days (base 65°F), 13% of the year's total heating and cooling demand.
Questions
How hot is Jacksonville in August?
The normal high is 91°F and the normal low is 73°F. From 1991 to 2020 the hottest August reading was 102°F (August 1, 1999).
Does it rain a lot in Jacksonville in August?
About 15 days in August have at least 0.01 in of precipitation, and the normal total is 6.9 in. The wettest August in 1991-2020 was in 2008 (16.8 in); the driest was in 2003 (1.8 in).
Is August a good time to visit Jacksonville?
August ranks 12th of 12 months on our comfort score for Jacksonville (34 out of 100). It has almost no comfortable days and about 20 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).