Jacksonville in Summer
In summer (June, July and August), Jacksonville sees average daytime highs around 84°F and overnight lows near 66°F, with 10.5 in of rain over about 30 wet days across the season. It is the warmest season of the year and the 2nd-wettest season.
Over the season highs climb from about 79°F in early June to 83°F by late August. The sky is clear or mostly clear about 39% of the time across summer, and the air most often feels muggy.
Summer is Jacksonville's best season of the year to visit on our travel score. For the whole year in context, see Jacksonville's year-round climate.
- Avg daytime high
- 84°F
- warmest season of the year
- Avg overnight low
- 66°F
- Rainfall
- 10.5 in
- 30 wet days
- Avg wind
- 6 mph
- Travel score
- 5.6
- best season of the year
- Months
- Jun · Jul · Aug
Temperature in Jacksonville in Summer
Over the season highs climb from about 79°F in early June to 83°F by late August.
A typical summer day in Jacksonville reaches about 84°F and drops to 66°F overnight. The warmest of the three months is July, the coolest June.
How summer really feels in Jacksonville
Once humidity and wind are folded in, summer brings about 0 days that feel above 90°F and 0 that feel at or below 32°F.
summer sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.
Jacksonville weather by month
How the three summer months (June, July and August) compare with the rest of the year — the season's months are highlighted.
| Month | High / Low (°F) | Rainfall (inches) | Wet days | Snow days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|---|
| Jan | 36° / 21° | 2.3 | 7.7 | 4 | 9.5 | 0.0 |
| Feb | 41° / 24° | 2.2 | 7.2 | 3.4 | 10.4 | 0.3 |
| Mar | 52° / 34° | 3.1 | 10.3 | 1.6 | 11.7 | 2.8 |
| Apr | 64° / 45° | 4.6 | 11.5 | 0.4 | 13 | 5.4 |
| May | 74° / 55° | 4.4 | 13.4 | 0 | 14.2 | 6.2 |
| Jun | 82° / 65° | 4.1 | 11.1 | 0 | 14.8 | 5.8 |
| Jul | 85° / 68° | 3.3 | 9.5 | 0 | 14.5 | 5.3 |
| Aug | 84° / 66° | 3.0 | 9 | 0 | 13.6 | 5.7 |
| Sep | 78° / 58° | 2.9 | 7.5 | 0 | 12.3 | 7.3 |
| Oct | 66° / 46° | 3.0 | 8.3 | 0.1 | 10.9 | 6.3 |
| Nov | 52° / 35° | 3.2 | 8.2 | 0.9 | 9.8 | 2.8 |
| Dec | 40° / 26° | 2.3 | 7.4 | 2.7 | 9.2 | 0.2 |
Cloud cover in Summer
The sky is clear or mostly clear about 39% of the time across summer.
Chance of precipitation in Summer
Jacksonville gets around 10.5 in of rain over 30 wet days across summer. The line is the day-by-day chance of measurable precipitation.
Humidity in Summer
Most of summer feels muggy — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Summer
Winds average 6 mph across summer.
Sunrise & sunset in Summer
Daylight runs from about 14 h 36 min in early June to 13 hours by late August. The lit band spans sunrise to sunset each day.
Solar energy in Summer
Average shortwave solar energy reaching the ground each day across summer, about 6.2 kWh/m².
Is summer a good time to visit Jacksonville?
Our two travel scores rate summer for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
summer is a reasonable time to visit Jacksonville for sightseeing. The water and warmth also suit a beach or pool day.
What to pack for Jacksonville in Summer
From summer's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In summer, Jacksonville sees daytime highs around 84°F and nights near 66°F. Pack light clothes and sun protection. Worth having: rain gear. About 30 days see rain.
UV index in Jacksonville in Summer
Clear-sky midday UV across summer averages around 9 (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 21 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 22 at about 2 (low).
The index reaches 3 or more — the level where the WHO recommends sun protection — in 10 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 2 | 3 | 5 | 6 | 8 | 9 | 9 | 8 | 7 | 4 | 3 | 2 |
| Level | Low | Moderate | Moderate | High | Very high | Very high | Very high | Very high | High | Moderate | Moderate | Low |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 2 | Low |
| Feb | 3 | Moderate |
| Mar | 5 | Moderate |
| Apr | 6 | High |
| May | 8 | Very high |
| Jun | 9 | Very high |
| Jul | 9 | Very high |
| Aug | 8 | Very high |
| Sep | 7 | High |
| Oct | 4 | Moderate |
| Nov | 3 | Moderate |
| Dec | 2 | Low |
Air quality in Jacksonville in Summer
Average fine-particle pollution (PM2.5) through the year — so you can see where summer falls, not just the annual average.
Air quality in Jacksonville is worst in July — around 16 µg/m³ PM2.5 (moderate), about 2.2× the cleanest month (October, 8 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) | 10 | 13 | 12 | 11 | 14 | 14 | 16 | 14 | 11 | 8 | 8 | 9 |
| Level | Good | Moderate | Moderate | Good | Moderate | Moderate | Moderate | Moderate | Good | Good | Good | Good |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 10 | Good |
| Feb | 13 | Moderate |
| Mar | 12 | Moderate |
| Apr | 11 | Good |
| May | 14 | Moderate |
| Jun | 14 | Moderate |
| Jul | 16 | Moderate |
| Aug | 14 | Moderate |
| Sep | 11 | Good |
| Oct | 8 | Good |
| Nov | 8 | Good |
| Dec | 9 | Good |
Where is Jacksonville?
Jacksonville sits at 39.7°N, 90.2°W, 610 ft above sea level, in United States. The nearest listed city is Springfield, 32 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 177 ft around an average of 604 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 243 ft; within 50 miles, only modest variations in elevation — a maximum elevation change of 604 ft.
The land around Jacksonville is covered by trees (32%), grassland (25%) and cropland (23%) within 2 miles, cropland (74%) within 10 miles, and cropland (65%) and trees (27%) 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 (39.7339°, -90.229°, elevation 610 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.