Galveston weather in August

In August, Galveston sees average daytime highs of 85°F and overnight lows near 81°F, with 4.5 in of rain across 13.1 wet days and about 13.1 hours of daylight. It is the 1st-warmest and 5th-wettest month of the year here.

Day-to-day highs hold fairly steady near 85°F through the month. The sky is clear or mostly clear about 42% of the time in August, and the air most often feels miserable.

Daylight stretches from about 13 h 24 min at the start of August to 12 h 36 min by month's end. Set against the rest of the year, August is Galveston's 8th-clearest and 12th-windiest month. For the whole year in context, see Galveston's year-round climate.

Daytime high
85°
1st warmest
Overnight low
81°
12th coldest
Rainfall
4.5 in
13.1 wet days
Daylight
13 h 06 min
5:51 AM – 6:55 PM
Cloud cover
51%
8th clearest
Wind
10 mph
12th windiest
Solar energy
5.96 kWh/m²
Travel score
5.0
out of 10

Galveston is city in and county seat of Galveston County, Texas, United States; port and coastal city.

Density
93/km²
people per km²
Founded
1785

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 85°F through the month.

A typical August day in Galveston reaches about 85°F in the afternoon and slips back to 81°F overnight — a 4°F spread between the day's warmth and the night's chill. On most days the high lands between 83°F and 87°F. Set against its neighbours, August runs on par with July and about 2°F warmer than September.

75°80°85°90°95°151015202531
Avg high (°F)Avg low (°F)
18581
28581
38581
48581
58581
68581
78581
88581
98581
108581
118581
128581
138581
148581
158581
168581
178581
188581
198581
208581
218581
228581
238581
248581
258580
268580
278580
288580
298580
308480
318480

How August really feels in Galveston

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.

Galveston weather by month

How August compares with the rest of the year at a glance. August is the 1st-warmest and 5th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysDaylight (hours)Travel score
Jan60° / 53°4.810.410.34.7
Feb61° / 55°3.58.710.95.2
Mar66° / 61°3.47.911.86.4
Apr72° / 67°3.57.212.77.3
May78° / 74°3.07.613.47.4
Jun83° / 79°4.310.713.86.1
Jul84° / 81°3.711.613.75.4
Aug85° / 81°4.513.113.15.0
Sep83° / 78°6.312.512.25.8
Oct77° / 71°4.78.611.37.4
Nov69° / 62°4.48.210.56.8
Dec62° / 55°4.510.110.25.5

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 42% of the time in August.

Beyond those clear spells, partly cloudy skies cover about 17% of August, with mostly cloudy or overcast conditions the remaining 41%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
16337
26337
36337
46337
56337
66337
76337
86238
96238
106139
116139
126139
136139
146040
155941
165941
175842
185842
195743
205743
215644
225743
235644
245644
255644
265644
275644
285743
295743
305743
315743

Chance of precipitation in August

Any precipitation

Galveston gets around 4.5 in of rain over 13.1 wet days in August. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 43% and peaks near 50% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%151015202531
Rain chance (%)
136
236
336
436
536
636
736
837
937
1038
1138
1239
1340
1441
1542
1643
1744
1845
1946
2046
2147
2248
2348
2449
2549
2650
2750
2850
2950
3050
3150

Humidity in August

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, August lands in the miserable band about 76% of days. Sticky, muggy-or-worse air turns up on roughly 99% of them.

0%25%50%75%100%151015202531
Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
10011485
20011485
30011485
40011485
50011485
60011584
70111583
80111583
90111583
100111682
110111682
120111682
130111781
140111781
150111880
160111880
170121978
180122077
190122176
200122176
210122275
220132373
230132472
240132571
250132769
260142867
270142966
280143065
290153163
300153262
311263259

Wind in August

Winds average 10 mph in August, the calmest month.

Across August, daily wind ranges from about 10 mph on the calmest days to 10 mph at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (mph)Feels
110light breeze
210light breeze
310light breeze
410light breeze
510light breeze
610light breeze
710light breeze
810light breeze
910light breeze
1010light breeze
1110light breeze
1210light breeze
1310light breeze
1410light breeze
1510light breeze
1610light breeze
1710light breeze
1810light breeze
1910light breeze
2010light breeze
2110light breeze
2210light breeze
2310light breeze
2410light breeze
2510light breeze
2610light breeze
2710light breeze
2810light breeze
2910light breeze
3010light breeze
3110light breeze

Sunrise & sunset in August

DaylightNight

Daylight runs from about 13 h 24 min at the start of August to 12 h 36 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 5:43 AM to 6:00 AM, and sunset from 7:08 PM to 6:39 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.45:437:08
213.45:437:07
313.45:447:06
413.45:447:06
513.35:457:05
613.35:467:04
713.35:467:03
813.35:477:02
913.25:477:02
1013.25:487:01
1113.25:497:00
1213.25:496:59
1313.15:506:58
1413.15:506:57
1513.15:516:56
1613.15:516:55
1713.05:526:54
1813.05:536:53
1913.05:536:52
2013.05:546:51
2112.95:546:50
2212.95:556:49
2312.95:556:48
2412.85:566:47
2512.85:576:46
2612.85:576:44
2712.85:586:43
2812.75:586:42
2912.75:596:41
3012.75:596:40
3112.66:006:39

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 5.96 kWh/m².

For context, solar energy here swings from a low near 2.75 kWh/m² to a high of 6.42 kWh/m² in July across the year — August's 5.96 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
16.4Intense
26.4Intense
36.3Intense
46.3Intense
56.3Intense
66.3Intense
76.3Intense
86.3Intense
96.2Intense
106.2Intense
116.2Intense
126.1Intense
136.1Intense
146.0Intense
156.0Intense
166.0Bright
175.9Bright
185.9Bright
195.8Bright
205.8Bright
215.8Bright
225.7Bright
235.7Bright
245.6Bright
255.6Bright
265.6Bright
275.5Bright
285.5Bright
295.5Bright
305.5Bright
315.4Bright
Planning a trip in August

Hazard calendar for Galveston

In seasonPeak

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

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

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

Is August a good time to visit Galveston?

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

5.0
Sightseeing
11th-best month of the year
6.6
Beach & pool
5th-best month of the year

August is a reasonable time to visit Galveston for sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Galveston in August

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

In August, Galveston sees daytime highs around 85°F and nights near 81°F. Pack light clothes. Worth having: rain gear and sun protection. About 13 days see rain.

light clothesrain gearsun protection

Sea temperature near Galveston in August

The nearest coast averages about 86°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 12 mi away) is warmest in August at about 86°F and coldest in January near 58°F.

It's comfortable for a long swim from Apr 4 to Nov 21 — about 7.6 months when the water holds above 68°F.

60°70°80°90°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°F)Comfort
Jan58Bracing
Feb59Cool
Mar64Cool
Apr71Refreshing
May78Warm
Jun83Tropical
Jul85Tropical
Aug86Tropical
Sep84Tropical
Oct78Warm
Nov69Refreshing
Dec62Cool

UV index in Galveston in August

LowModerateHighVery highExtreme

Clear-sky midday UV in August peaks around 11 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Galveston peaks around July 18 at about 11 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 21 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 highHighModerateJul 18UV 11Dec 21UV 4
UV index (midday)Level
Jan4Moderate
Feb6High
Mar7High
Apr10Extreme
May10Extreme
Jun11Extreme
Jul11Extreme
Aug11Extreme
Sep9Very high
Oct6High
Nov5High
Dec4Moderate

Air quality in Galveston 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 Galveston is worst in July — around 19 µg/m³ PM2.5 (moderate), about 3.4× the cleanest month (December, 6 µg/m³).

Modeled monthly averages (CAMS reanalysis, 2015–2024).

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1519 µg/m³Dec 176 µg/m³
PM2.5 (µg/m³)Level
Jan6Good
Feb7Good
Mar8Good
Apr9Good
May12Good
Jun16Moderate
Jul19Moderate
Aug13Moderate
Sep10Good
Oct6Good
Nov6Good
Dec6Good
Location & terrain

Where is Galveston?

Galveston sits at 29.3°N, 94.8°W, 7 ft above sea level, in United States. The nearest listed city is Texas City, 8.7 mi away.

Topography around Galveston

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

Within 2 miles, the terrain around Galveston has only modest variations in elevation — a maximum elevation change of 43 ft around an average of 7 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 62 ft; within 50 miles, only modest variations in elevation — a maximum elevation change of 236 ft.

The land around Galveston is covered by artificial surfaces (41%) and water (32%) within 2 miles, water (80%) within 10 miles, and water (45%) within 50 miles.

2 miles
43 ft
10 miles
62 ft
50 miles
236 ft
treesgrasslandcroplandartificial surfacesbare terrainwaterwetland
August weather nearby: Texas City 8.7 mi · La Marque 11 mi · Dickinson 19 mi · League City 23 mi · Alvin 28 mi · La Porte 29 mi · Friendswood 29 mi · Baytown 32 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 Galveston (29.3013°, -94.7977°, elevation 7 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).