Fleming Island weather in August

In August, Fleming Island sees average daytime highs of 89°F and overnight lows near 74°F, with 6.2 in of rain across 22.3 wet days and about 13.1 hours of daylight. It is the 2nd-warmest and 1st-wettest month of the year here.

Day-to-day highs hold fairly steady near 89°F through the month. The sky is clear or mostly clear about 18% of the time in August, and the air most often feels oppressive.

Daylight stretches from about 13 h 30 min at the start of August to 12 h 42 min by month's end. Set against the rest of the year, August is Fleming Island's 12th-clearest and 11th-windiest month. For the whole year in context, see Fleming Island's year-round climate.

Daytime high
89°
2nd warmest
Overnight low
74°
12th coldest
Rainfall
6.2 in
22.3 wet days
Daylight
13 h 06 min
5:58 AM – 7:04 PM
Cloud cover
68%
12th clearest
Wind
5 mph
11th windiest
Solar energy
5.28 kWh/m²
Travel score
3.0
out of 10

Fleming Island is census-designated place in Clay County, Florida.

Density
453/km²
people per km²

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in August

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 89°F through the month.

A typical August day in Fleming Island reaches about 89°F in the afternoon and slips back to 74°F overnight — a 15°F spread between the day's warmth and the night's chill. On most days the high lands between 84°F and 94°F. Set against its neighbours, August runs on par with July and about 3°F warmer than September.

70°80°90°151015202531
Avg high (°F)Avg low (°F)
19074
29074
39074
49074
59074
69074
79074
89074
99074
109074
119074
129074
138974
148974
158974
168974
178974
188974
198974
208974
218974
228974
238974
248974
258974
268974
278874
288874
298874
308874
318874

How August really feels in Fleming Island

Once humidity and wind are folded in, August averages 31 days that feel above 90°F and 0 that feel at or below 32°F — the comfort signal a plain temperature reading hides.

Days feeling ≥ 90°F
31
heat index over the day's high
Days feeling ≤ 32°F
0
wind chill below the day's low

The story in August is heat — humidity pushes the afternoon "feels like" well above the raw temperature.

Fleming Island weather by month

How August compares with the rest of the year at a glance. August is the 2nd-warmest and 1st-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysDaylight (hours)Travel score
Jan66° / 46°2.67.310.36.5
Feb69° / 49°2.46.610.96.8
Mar74° / 53°2.97.311.87.4
Apr79° / 59°2.3712.77.2
May85° / 66°2.99.113.55.5
Jun88° / 72°5.418.813.93.4
Jul90° / 74°5.521.113.72.9
Aug89° / 74°6.222.313.13.0
Sep86° / 72°5.116.512.24.2
Oct80° / 64°2.89.211.36.7
Nov73° / 55°1.6610.57.5
Dec68° / 49°2.26.910.16.8

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 18% of the time in August, the cloudiest month of the year.

Beyond those clear spells, partly cloudy skies cover about 21% of August, with mostly cloudy or overcast conditions the remaining 62%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
13565
23664
33664
43664
53664
63664
73664
83763
93763
103763
113862
123862
133862
143862
153862
163961
173961
183961
194060
204060
214060
224060
234060
244060
254060
264060
274060
284060
293961
303961
313961

Chance of precipitation in August

Any precipitation

Fleming Island gets around 6.2 in of rain over 22.3 wet days in August, the wettest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 71% and peaks near 73% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%80%151015202531
Rain chance (%)
172
272
373
473
573
673
773
873
973
1073
1173
1273
1373
1473
1573
1673
1773
1873
1972
2072
2171
2271
2370
2469
2569
2668
2767
2867
2966
3066
3165

Humidity in August

DryComfortableHumidMuggyOppressiveMiserable

Most of August feels oppressive — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, August lands in the oppressive band about 73% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202531
Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1048016
2048016
3047917
4047818
5047818
6047719
7047620
8047521
9047422
10047323
11047224
12047224
13047125
14047125
15057025
16057025
17057025
18057025
19057124
20067024
21067024
22067123
23067123
24067222
25077122
26077221
27077320
28187120
29187219
30197218
31197317

Wind in August

Winds average 5 mph in August.

Across August, daily wind ranges from about 5 mph on the calmest days to 5 mph at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (mph)Feels
15calm
25calm
35calm
45calm
55calm
65calm
75calm
85calm
95calm
105calm
115calm
125calm
135calm
145calm
155calm
165calm
175calm
185calm
195calm
205calm
215calm
225calm
235calm
245calm
255calm
265calm
275calm
285calm
295calm
305calm
315calm

Sunrise & sunset in August

DaylightNight

Daylight runs from about 13 h 30 min at the start of August to 12 h 42 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 48 minutes over August. Sunrise moves from 5:49 AM to 6:07 AM, and sunset from 7:17 PM to 6:47 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.55:497:17
213.45:507:16
313.45:507:15
413.45:517:15
513.45:517:14
613.45:527:13
713.35:537:12
813.35:537:11
913.35:547:11
1013.35:547:10
1113.25:557:09
1213.25:567:08
1313.25:567:07
1413.15:577:06
1513.15:577:05
1613.15:587:04
1713.15:597:03
1813.05:597:02
1913.06:007:01
2013.06:007:00
2113.06:016:59
2212.96:026:57
2312.96:026:56
2412.96:036:55
2512.86:036:54
2612.86:046:53
2712.86:056:52
2812.86:056:51
2912.76:066:49
3012.76:066:48
3112.76:076:47

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 5.28 kWh/m².

For context, solar energy here swings from a low near 2.81 kWh/m² to a high of 6.32 kWh/m² in May across the year — August's 5.28 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
15.6Bright
25.6Bright
35.5Bright
45.5Bright
55.5Bright
65.5Bright
75.5Bright
85.5Bright
95.4Bright
105.4Bright
115.4Bright
125.4Bright
135.4Bright
145.4Bright
155.3Bright
165.3Bright
175.3Bright
185.3Bright
195.3Bright
205.2Bright
215.2Bright
225.2Bright
235.2Bright
245.2Bright
255.1Bright
265.1Bright
275.1Bright
285.0Bright
295.0Bright
305.0Bright
315.0Bright
Planning a trip in August

Hazard calendar for Fleming Island

In seasonPeak

In August, Fleming Island sits inside its atlantic hurricane and rainy season season. The full year is below, with each hazard's peak months called out.

Fleming Island sits in the Atlantic hurricane belt; the season peaks August–October.

Fleming Island's rainy season runs May–October, when most of the year's rain falls.

Atlantic hurricane
Rainy season
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is August a good time to visit Fleming Island?

Our two travel scores rate August for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

3.0
Sightseeing
11th-best month of the year
4.7
Beach & pool
9th-best month of the year

August is a weaker month for outdoor sightseeing in Fleming Island.

What to pack for Fleming Island in August

From August's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In August, Fleming Island sees daytime highs around 89°F and nights near 74°F. Pack light clothes and rain gear. Worth having: sun protection. About 22 days see rain.

light clothesrain gearsun protection

Sea temperature near Fleming Island in August

The nearest coast averages about 82°F in August — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 29 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.

60°70°80°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°F)Comfort
Jan62Cool
Feb61Cool
Mar63Cool
Apr69Refreshing
May75Refreshing
Jun80Warm
Jul82Warm
Aug82Tropical
Sep82Warm
Oct78Warm
Nov70Refreshing
Dec65Cool

UV index in Fleming Island in August

LowModerateHighVery highExtreme

Clear-sky midday UV in August peaks around 10 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Fleming Island peaks around June 21 at about 11 (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.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highExtremeVery highHighModerateJun 21UV 11Dec 19UV 4
UV index (midday)Level
Jan4Moderate
Feb6High
Mar7Very high
Apr7High
May9Very high
Jun11Extreme
Jul10Extreme
Aug10Very high
Sep8Very high
Oct6High
Nov5Moderate
Dec4Moderate

Air quality in Fleming Island in August

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where August falls, not just the annual average.

Air quality in Fleming Island 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).

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1618 µg/m³Dec 138 µg/m³
PM2.5 (µg/m³)Level
Jan9Good
Feb13Moderate
Mar12Moderate
Apr13Moderate
May14Moderate
Jun16Moderate
Jul18Moderate
Aug16Moderate
Sep12Good
Oct8Good
Nov8Good
Dec7Good
Location & terrain

Where is Fleming Island?

Fleming Island sits at 30.1°N, 81.7°W, 20 ft above sea level, in United States. The nearest listed city is Lakeside, 3.7 mi away.

Topography around Fleming Island

How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Fleming Island.

Within 2 miles, the terrain around Fleming Island has only modest variations in elevation — a maximum elevation change of 79 ft around an average of 23 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 164 ft; within 50 miles, only modest variations in elevation — a maximum elevation change of 308 ft.

The land around Fleming Island is covered by trees (61%) within 2 miles, trees (59%) within 10 miles, and trees (65%) and water (23%) within 50 miles.

2 miles
79 ft
10 miles
164 ft
50 miles
308 ft
treesgrasslandcroplandartificial surfaceswaterwetland
August weather nearby: Lakeside 3.7 mi · Fruit Cove 5.0 mi · Oakleaf Plantation 8.7 mi · St. Johns 11 mi · Jacksonville 17 mi · Palm Valley 21 mi · Ponte Vedra Beach 22 mi · Jacksonville Beach 24 mi

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
Protestant 47%unaffiliated 23%Roman Catholic 21%Jewish 2%

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 Fleming Island (30.0933°, -81.719°, elevation 20 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).