Galveston, TX Climate & Monthly Averages
The climate of Galveston
Galveston is genuinely wet: 66.6 inches (1691 mm) falls in an average year, across 156 days that carry about 10.8 mm each when they come. Temperatures are the calmer variable, running 61°F (16°C) to 87°F (31°C) between January and August.
Climate quick facts
- Hottest month: August - highs near 87°F (31°C)
- Coldest month: January - highs near 61°F (16°C)
- Decade extremes (2015-2024): 98°F (37°C) high · 21°F (-6°C) low
- Wettest month: September (15 rainy days) · Sunniest: June (11.4 h sun/day)
- Climate type: humid subtropical
- Annual swing: 16°C between the average warmest and coolest month · day to night: 4°C
- Months averaging 30°C or hotter: 2
- Average humidity: 78%
Temperatures through the year
Sunshine averages 9.3 hours a day over the year, peaking in June at 11.4 hours. Warmth peaks in August: highs of 87°F (31°C), lows of 81°F (27°C). January bottoms out at 61°F (16°C) in daylight, 51°F (10°C) after dark. Three of the twelve months pair mild highs with fewer than twelve wet days; the longest unbroken run is October through December.
Rain, sun and snow
Days and nights are about 4°C apart on average - narrower than almost anywhere else we cover. Precipitation concentrates in September - 6.9 inches (176 mm) on 15 days - and thins out by February. The gridded 2015-2024 daily record for this location tops out at 98°F (37°C) and bottoms at 21°F (-6°C) - decade extremes, not all-time station records.
How Galveston compares
- 29% of the year's precipitation falls in its wettest three months - more evenly spread than all but 9% of the 3496 cities we track.
Ranked against every city in our dataset, each measured on the same ten-year window.
Monthly climate table
| Month | High | Low | Rain days | Precipitation | Sunshine | Daylight | Wet-day chance | Humidity |
|---|---|---|---|---|---|---|---|---|
| January | 61° | 51° | 10 | 5.0 in | 7.3 h/day | 10.5 h | 32% | 77% |
| February | 63° | 54° | 11 | 3.4 in | 7.6 h/day | 11.1 h | 38% | 82% |
| March | 69° | 61° | 12 | 4.6 in | 8.4 h/day | 11.9 h | 39% | 80% |
| April | 74° | 67° | 14 | 5.9 in | 9.8 h/day | 12.8 h | 47% | 78% |
| May | 80° | 74° | 16 | 6.5 in | 10.4 h/day | 13.6 h | 52% | 80% |
| June | 85° | 79° | 15 | 6.3 in | 11.4 h/day | 14.0 h | 51% | 78% |
| July | 87° | 81° | 14 | 5.7 in | 11.4 h/day | 13.8 h | 45% | 78% |
| August | 87° | 81° | 16 | 6.5 in | 11.1 h/day | 13.2 h | 52% | 76% |
| September | 85° | 78° | 15 | 6.9 in | 9.9 h/day | 12.3 h | 50% | 75% |
| October | 79° | 71° | 11 | 5.7 in | 9.5 h/day | 11.4 h | 35% | 73% |
| November | 70° | 62° | 10 | 5.1 in | 8.0 h/day | 10.6 h | 34% | 76% |
| December | 65° | 56° | 11 | 4.9 in | 7.1 h/day | 10.3 h | 36% | 80% |
Galveston month by month
Average high and low for each month, with the bar showing where it sits in Galveston's year (left is the coldest night, right is the warmest afternoon).
January
- Rain
- 10 days
- Sunshine
- 7.3 h
- Daylight
- 10.5 h
February
- Rain
- 11 days
- Sunshine
- 7.6 h
- Daylight
- 11.1 h
March
- Rain
- 12 days
- Sunshine
- 8.4 h
- Daylight
- 11.9 h
April
- Rain
- 14 days
- Sunshine
- 9.8 h
- Daylight
- 12.8 h
May
- Rain
- 16 days
- Sunshine
- 10.4 h
- Daylight
- 13.6 h
June
- Rain
- 15 days
- Sunshine
- 11.4 h
- Daylight
- 14.0 h
July
- Rain
- 14 days
- Sunshine
- 11.4 h
- Daylight
- 13.8 h
August
- Rain
- 16 days
- Sunshine
- 11.1 h
- Daylight
- 13.2 h
September
- Rain
- 15 days
- Sunshine
- 9.9 h
- Daylight
- 12.3 h
October
- Rain
- 11 days
- Sunshine
- 9.5 h
- Daylight
- 11.4 h
November
- Rain
- 10 days
- Sunshine
- 8.0 h
- Daylight
- 10.6 h
December
- Rain
- 11 days
- Sunshine
- 7.1 h
- Daylight
- 10.3 h
Warmer places to go, by month: January · February · March · April · May · June · July · August · September · October · November · December
Seasons in Galveston
Spring (March through May)
Spring in Galveston settles into easy warmth, with daytime highs averaging 75°F (24°C) and nights around 67°F (20°C); rain falls on around 42 of the 90 days.
Summer (June through August)
Through summer, Galveston runs hot: 86°F (30°C) by day, 80°F (27°C) after dark, and rain falls on around 46 of the 90 days. Daylight is generous - around 11.3 hours of sun a day. With the moisture factored in, afternoons feel hotter than the reading suggests - the humidity and dew point converter shows why.
Fall (September through November)
Fall in Galveston brings comfortable warmth, with daytime highs averaging 78°F (25°C) and nights around 71°F (21°C); rain falls on around 36 of the 90 days.
Winter (December through February)
Winter in Galveston is crisp but comfortable, with daytime highs averaging 63°F (17°C) and nights around 54°F (12°C); rain falls on around 32 of the 90 days.
Climate questions, answered
How long does summer last in Galveston?
How humid does Galveston get?
How cold does Galveston get in winter?
What is the average temperature in Galveston?
What should I pack for Galveston?
How hot does Galveston get in summer?
Best time to visit Galveston
The best time to visit Galveston is generally October to February, when warm days, manageable rainfall and plenty of daylight line up. Daytime temperatures in that window sit near 67°F (20°C), with rain on about 11 days a month. For the same question asked the other way round, see where else is warm in October.
Pack for Galveston with light clothing for the warm months, proper waterproofs rather than an umbrella - wet days are the norm here and moisture-wicking fabrics for the humidity. August nights average 81°F (27°C), so evenings rarely match the afternoons.
Galveston temperature records (2015-2024)
Derived from ERA5 reanalysis data, 2015–2024. Official station records may differ. Need the precipitation in other units? The mm-to-inches rainfall converter handles it.