Galveston weather in May
In May, Galveston sees average daytime highs of 78°F and overnight lows near 74°F, with 3.0 in of rain across 7.6 wet days and about 13.4 hours of daylight. It is the 5th-warmest and 12th-wettest month of the year here.
Highs climb over the month, from about 75°F in the first days to 80°F by the end. The sky is clear or mostly clear about 50% of the time in May, and the air most often feels oppressive.
Daylight stretches from about 13 h 06 min at the start of May to 13 h 42 min by month's end. Set against the rest of the year, May is Galveston's 3rd-clearest and 7th-windiest month. For the whole year in context, see Galveston's year-round climate.
- Daytime high
- 78°
- 5th warmest
- Overnight low
- 74°
- 8th coldest
- Rainfall
- 3.0 in
- 7.6 wet days
- Daylight
- 13 h 30 min
- 5:32 AM – 6:59 PM
- Cloud cover
- 46%
- 3rd clearest
- Wind
- 13 mph
- 7th windiest
- Solar energy
- 6.38 kWh/m²
- Travel score
- 7.4
- 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 May
Highs climb over the month, from about 75°F in the first days to 80°F by the end.
A typical May day in Galveston reaches about 78°F in the afternoon and slips back to 74°F overnight — a 4°F spread between the day's warmth and the night's chill. On most days the high lands between 75°F and 80°F. Set against its neighbours, May runs about 6°F warmer than April and about 5°F cooler than June.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°F) | 75 | 75 | 75 | 75 | 76 | 76 | 76 | 76 | 76 | 77 | 77 | 77 | 77 | 77 | 78 | 78 | 78 | 78 | 78 | 78 | 79 | 79 | 79 | 79 | 80 | 80 | 80 | 80 | 80 | 80 | 81 |
| Avg low (°F) | 71 | 71 | 71 | 71 | 72 | 72 | 72 | 72 | 73 | 73 | 73 | 73 | 73 | 74 | 74 | 74 | 74 | 74 | 75 | 75 | 75 | 75 | 75 | 76 | 76 | 76 | 76 | 76 | 77 | 77 | 77 |
| Avg high (°F) | Avg low (°F) | |
|---|---|---|
| 1 | 75 | 71 |
| 2 | 75 | 71 |
| 3 | 75 | 71 |
| 4 | 75 | 71 |
| 5 | 76 | 72 |
| 6 | 76 | 72 |
| 7 | 76 | 72 |
| 8 | 76 | 72 |
| 9 | 76 | 73 |
| 10 | 77 | 73 |
| 11 | 77 | 73 |
| 12 | 77 | 73 |
| 13 | 77 | 73 |
| 14 | 77 | 74 |
| 15 | 78 | 74 |
| 16 | 78 | 74 |
| 17 | 78 | 74 |
| 18 | 78 | 74 |
| 19 | 78 | 75 |
| 20 | 78 | 75 |
| 21 | 79 | 75 |
| 22 | 79 | 75 |
| 23 | 79 | 75 |
| 24 | 79 | 76 |
| 25 | 80 | 76 |
| 26 | 80 | 76 |
| 27 | 80 | 76 |
| 28 | 80 | 76 |
| 29 | 80 | 77 |
| 30 | 80 | 77 |
| 31 | 81 | 77 |
How May really feels in Galveston
Once humidity and wind are folded in, May averages 0 days that feel above 90°F and 0 that feel at or below 32°F — the comfort signal a plain temperature reading hides.
May sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.
Galveston weather by month
How May compares with the rest of the year at a glance. May is the 5th-warmest and 12th-wettest month here — the current month is highlighted below.
| Month | High / Low (°F) | Rainfall (inches) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 60° / 53° | 4.8 | 10.4 | 10.3 | 4.7 |
| Feb | 61° / 55° | 3.5 | 8.7 | 10.9 | 5.2 |
| Mar | 66° / 61° | 3.4 | 7.9 | 11.8 | 6.4 |
| Apr | 72° / 67° | 3.5 | 7.2 | 12.7 | 7.3 |
| May | 78° / 74° | 3.0 | 7.6 | 13.4 | 7.4 |
| Jun | 83° / 79° | 4.3 | 10.7 | 13.8 | 6.1 |
| Jul | 84° / 81° | 3.7 | 11.6 | 13.7 | 5.4 |
| Aug | 85° / 81° | 4.5 | 13.1 | 13.1 | 5.0 |
| Sep | 83° / 78° | 6.3 | 12.5 | 12.2 | 5.8 |
| Oct | 77° / 71° | 4.7 | 8.6 | 11.3 | 7.4 |
| Nov | 69° / 62° | 4.4 | 8.2 | 10.5 | 6.8 |
| Dec | 62° / 55° | 4.5 | 10.1 | 10.2 | 5.5 |
Cloud cover in May
The sky is clear or mostly clear about 50% of the time in May.
Beyond those clear spells, partly cloudy skies cover about 18% of May, with mostly cloudy or overcast conditions the remaining 33%. Skies tend to open up as the month goes on.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 65 | 65 | 64 | 65 | 65 | 64 | 65 | 64 | 64 | 64 | 64 | 64 | 65 | 65 | 66 | 66 | 68 | 68 | 68 | 69 | 69 | 69 | 69 | 70 | 70 | 71 | 71 | 71 | 71 | 71 | 71 |
| Cloudier (%) | 35 | 35 | 36 | 35 | 35 | 36 | 35 | 36 | 36 | 36 | 36 | 36 | 35 | 35 | 34 | 34 | 32 | 32 | 32 | 31 | 31 | 31 | 31 | 30 | 30 | 29 | 29 | 29 | 29 | 29 | 29 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 65 | 35 |
| 2 | 65 | 35 |
| 3 | 64 | 36 |
| 4 | 65 | 35 |
| 5 | 65 | 35 |
| 6 | 64 | 36 |
| 7 | 65 | 35 |
| 8 | 64 | 36 |
| 9 | 64 | 36 |
| 10 | 64 | 36 |
| 11 | 64 | 36 |
| 12 | 64 | 36 |
| 13 | 65 | 35 |
| 14 | 65 | 35 |
| 15 | 66 | 34 |
| 16 | 66 | 34 |
| 17 | 68 | 32 |
| 18 | 68 | 32 |
| 19 | 68 | 32 |
| 20 | 69 | 31 |
| 21 | 69 | 31 |
| 22 | 69 | 31 |
| 23 | 69 | 31 |
| 24 | 70 | 30 |
| 25 | 70 | 30 |
| 26 | 71 | 29 |
| 27 | 71 | 29 |
| 28 | 71 | 29 |
| 29 | 71 | 29 |
| 30 | 71 | 29 |
| 31 | 71 | 29 |
Chance of precipitation in May
Galveston gets around 3.0 in of rain over 7.6 wet days in May, the driest month. The line is the day-by-day chance of measurable precipitation.
Day to day, the chance of measurable rain averages around 24% and peaks near 30% on the wettest days. The odds climb toward the end of the month.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain chance (%) | 21 | 21 | 21 | 21 | 21 | 21 | 22 | 22 | 22 | 22 | 22 | 23 | 23 | 24 | 24 | 24 | 24 | 24 | 24 | 25 | 25 | 25 | 26 | 26 | 27 | 28 | 28 | 29 | 29 | 30 | 30 |
| Rain chance (%) | |
|---|---|
| 1 | 21 |
| 2 | 21 |
| 3 | 21 |
| 4 | 21 |
| 5 | 21 |
| 6 | 21 |
| 7 | 22 |
| 8 | 22 |
| 9 | 22 |
| 10 | 22 |
| 11 | 22 |
| 12 | 23 |
| 13 | 23 |
| 14 | 24 |
| 15 | 24 |
| 16 | 24 |
| 17 | 24 |
| 18 | 24 |
| 19 | 24 |
| 20 | 25 |
| 21 | 25 |
| 22 | 25 |
| 23 | 26 |
| 24 | 26 |
| 25 | 27 |
| 26 | 28 |
| 27 | 28 |
| 28 | 29 |
| 29 | 29 |
| 30 | 30 |
| 31 | 30 |
Humidity in May
Most of May feels oppressive — the stacked bands show each day's mix of comfort levels, read off the dew point.
By dew point, May lands in the oppressive band about 53% of days. Sticky, muggy-or-worse air turns up on roughly 83% of them.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dry (%) | 8 | 8 | 7 | 7 | 6 | 6 | 6 | 5 | 5 | 5 | 5 | 4 | 4 | 4 | 4 | 3 | 3 | 3 | 3 | 3 | 2 | 2 | 2 | 2 | 1 | 1 | 1 | 1 | 0 | 0 | 0 |
| Comfortable (%) | 11 | 10 | 10 | 9 | 9 | 8 | 7 | 7 | 7 | 6 | 6 | 5 | 5 | 5 | 4 | 4 | 4 | 4 | 3 | 3 | 3 | 3 | 3 | 2 | 2 | 2 | 1 | 1 | 1 | 1 | 0 |
| Humid (%) | 14 | 14 | 14 | 13 | 13 | 13 | 12 | 12 | 12 | 12 | 11 | 11 | 11 | 10 | 10 | 9 | 9 | 8 | 8 | 7 | 6 | 6 | 5 | 5 | 4 | 4 | 3 | 3 | 3 | 3 | 2 |
| Muggy (%) | 30 | 29 | 28 | 27 | 27 | 26 | 25 | 25 | 24 | 23 | 23 | 23 | 22 | 22 | 22 | 22 | 22 | 21 | 21 | 21 | 20 | 20 | 19 | 18 | 18 | 17 | 16 | 15 | 14 | 13 | 12 |
| Oppressive (%) | 36 | 38 | 40 | 42 | 44 | 45 | 47 | 48 | 49 | 51 | 51 | 53 | 54 | 54 | 55 | 56 | 55 | 57 | 57 | 57 | 59 | 58 | 59 | 60 | 60 | 60 | 62 | 62 | 62 | 62 | 64 |
| Miserable (%) | 1 | 1 | 2 | 2 | 2 | 2 | 2 | 3 | 3 | 3 | 4 | 4 | 4 | 5 | 5 | 6 | 7 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 15 | 16 | 17 | 18 | 20 | 21 | 22 |
| Dry (%) | Comfortable (%) | Humid (%) | Muggy (%) | Oppressive (%) | Miserable (%) | |
|---|---|---|---|---|---|---|
| 1 | 8 | 11 | 14 | 30 | 36 | 1 |
| 2 | 8 | 10 | 14 | 29 | 38 | 1 |
| 3 | 7 | 10 | 14 | 28 | 40 | 2 |
| 4 | 7 | 9 | 13 | 27 | 42 | 2 |
| 5 | 6 | 9 | 13 | 27 | 44 | 2 |
| 6 | 6 | 8 | 13 | 26 | 45 | 2 |
| 7 | 6 | 7 | 12 | 25 | 47 | 2 |
| 8 | 5 | 7 | 12 | 25 | 48 | 3 |
| 9 | 5 | 7 | 12 | 24 | 49 | 3 |
| 10 | 5 | 6 | 12 | 23 | 51 | 3 |
| 11 | 5 | 6 | 11 | 23 | 51 | 4 |
| 12 | 4 | 5 | 11 | 23 | 53 | 4 |
| 13 | 4 | 5 | 11 | 22 | 54 | 4 |
| 14 | 4 | 5 | 10 | 22 | 54 | 5 |
| 15 | 4 | 4 | 10 | 22 | 55 | 5 |
| 16 | 3 | 4 | 9 | 22 | 56 | 6 |
| 17 | 3 | 4 | 9 | 22 | 55 | 7 |
| 18 | 3 | 4 | 8 | 21 | 57 | 7 |
| 19 | 3 | 3 | 8 | 21 | 57 | 8 |
| 20 | 3 | 3 | 7 | 21 | 57 | 9 |
| 21 | 2 | 3 | 6 | 20 | 59 | 10 |
| 22 | 2 | 3 | 6 | 20 | 58 | 11 |
| 23 | 2 | 3 | 5 | 19 | 59 | 12 |
| 24 | 2 | 2 | 5 | 18 | 60 | 13 |
| 25 | 1 | 2 | 4 | 18 | 60 | 15 |
| 26 | 1 | 2 | 4 | 17 | 60 | 16 |
| 27 | 1 | 1 | 3 | 16 | 62 | 17 |
| 28 | 1 | 1 | 3 | 15 | 62 | 18 |
| 29 | 0 | 1 | 3 | 14 | 62 | 20 |
| 30 | 0 | 1 | 3 | 13 | 62 | 21 |
| 31 | 0 | 0 | 2 | 12 | 64 | 22 |
Wind in May
Winds average 13 mph in May.
Across May, daily wind ranges from about 12 mph on the calmest days to 13 mph at its breeziest. It stays fairly steady from day to day.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wind speed (mph) | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 |
| Feels | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze |
| Wind speed (mph) | Feels | |
|---|---|---|
| 1 | 13 | breezy |
| 2 | 13 | breezy |
| 3 | 13 | breezy |
| 4 | 13 | breezy |
| 5 | 13 | breezy |
| 6 | 13 | breezy |
| 7 | 13 | breezy |
| 8 | 13 | breezy |
| 9 | 13 | breezy |
| 10 | 13 | breezy |
| 11 | 13 | breezy |
| 12 | 13 | breezy |
| 13 | 13 | breezy |
| 14 | 13 | breezy |
| 15 | 13 | breezy |
| 16 | 13 | breezy |
| 17 | 13 | breezy |
| 18 | 13 | breezy |
| 19 | 13 | breezy |
| 20 | 12 | breezy |
| 21 | 12 | breezy |
| 22 | 12 | light breeze |
| 23 | 12 | light breeze |
| 24 | 12 | light breeze |
| 25 | 12 | light breeze |
| 26 | 12 | light breeze |
| 27 | 12 | light breeze |
| 28 | 12 | light breeze |
| 29 | 12 | light breeze |
| 30 | 12 | light breeze |
| 31 | 12 | light breeze |
Sunrise & sunset in May
Daylight runs from about 13 h 06 min at the start of May to 13 h 42 min by month's end. The lit band spans sunrise to sunset each day.
Days grow by about 36 minutes over May. Sunrise moves from 5:43 AM to 5:25 AM, and sunset from 6:50 PM to 7:08 PM.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 13.1 | 13.1 | 13.2 | 13.2 | 13.2 | 13.2 | 13.3 | 13.3 | 13.3 | 13.3 | 13.4 | 13.4 | 13.4 | 13.4 | 13.4 | 13.5 | 13.5 | 13.5 | 13.5 | 13.5 | 13.6 | 13.6 | 13.6 | 13.6 | 13.6 | 13.6 | 13.7 | 13.7 | 13.7 | 13.7 | 13.7 |
| Sunrise (AM) | 5:43 | 5:42 | 5:41 | 5:40 | 5:40 | 5:39 | 5:38 | 5:37 | 5:36 | 5:36 | 5:35 | 5:34 | 5:33 | 5:33 | 5:32 | 5:32 | 5:31 | 5:30 | 5:30 | 5:29 | 5:29 | 5:28 | 5:28 | 5:27 | 5:27 | 5:27 | 5:26 | 5:26 | 5:26 | 5:25 | 5:25 |
| Sunset (PM) | 6:50 | 6:50 | 6:51 | 6:52 | 6:52 | 6:53 | 6:54 | 6:54 | 6:55 | 6:55 | 6:56 | 6:57 | 6:57 | 6:58 | 6:59 | 6:59 | 7:00 | 7:01 | 7:01 | 7:02 | 7:02 | 7:03 | 7:04 | 7:04 | 7:05 | 7:05 | 7:06 | 7:07 | 7:07 | 7:08 | 7:08 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 13.1 | 5:43 | 6:50 |
| 2 | 13.1 | 5:42 | 6:50 |
| 3 | 13.2 | 5:41 | 6:51 |
| 4 | 13.2 | 5:40 | 6:52 |
| 5 | 13.2 | 5:40 | 6:52 |
| 6 | 13.2 | 5:39 | 6:53 |
| 7 | 13.3 | 5:38 | 6:54 |
| 8 | 13.3 | 5:37 | 6:54 |
| 9 | 13.3 | 5:36 | 6:55 |
| 10 | 13.3 | 5:36 | 6:55 |
| 11 | 13.4 | 5:35 | 6:56 |
| 12 | 13.4 | 5:34 | 6:57 |
| 13 | 13.4 | 5:33 | 6:57 |
| 14 | 13.4 | 5:33 | 6:58 |
| 15 | 13.4 | 5:32 | 6:59 |
| 16 | 13.5 | 5:32 | 6:59 |
| 17 | 13.5 | 5:31 | 7:00 |
| 18 | 13.5 | 5:30 | 7:01 |
| 19 | 13.5 | 5:30 | 7:01 |
| 20 | 13.5 | 5:29 | 7:02 |
| 21 | 13.6 | 5:29 | 7:02 |
| 22 | 13.6 | 5:28 | 7:03 |
| 23 | 13.6 | 5:28 | 7:04 |
| 24 | 13.6 | 5:27 | 7:04 |
| 25 | 13.6 | 5:27 | 7:05 |
| 26 | 13.6 | 5:27 | 7:05 |
| 27 | 13.7 | 5:26 | 7:06 |
| 28 | 13.7 | 5:26 | 7:07 |
| 29 | 13.7 | 5:26 | 7:07 |
| 30 | 13.7 | 5:25 | 7:08 |
| 31 | 13.7 | 5:25 | 7:08 |
Solar energy in May
Average shortwave solar energy reaching the ground each day in May, about 6.38 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 — May's 6.38 kWh/m² sits near the top of that range.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solar energy (kWh/m²) | 6.2 | 6.2 | 6.2 | 6.3 | 6.3 | 6.3 | 6.3 | 6.3 | 6.3 | 6.3 | 6.3 | 6.3 | 6.3 | 6.4 | 6.4 | 6.4 | 6.4 | 6.4 | 6.4 | 6.5 | 6.5 | 6.5 | 6.5 | 6.5 | 6.5 | 6.5 | 6.5 | 6.5 | 6.5 | 6.5 | 6.5 |
| Level | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| 1 | 6.2 | Intense |
| 2 | 6.2 | Intense |
| 3 | 6.2 | Intense |
| 4 | 6.3 | Intense |
| 5 | 6.3 | Intense |
| 6 | 6.3 | Intense |
| 7 | 6.3 | Intense |
| 8 | 6.3 | Intense |
| 9 | 6.3 | Intense |
| 10 | 6.3 | Intense |
| 11 | 6.3 | Intense |
| 12 | 6.3 | Intense |
| 13 | 6.3 | Intense |
| 14 | 6.4 | Intense |
| 15 | 6.4 | Intense |
| 16 | 6.4 | Intense |
| 17 | 6.4 | Intense |
| 18 | 6.4 | Intense |
| 19 | 6.4 | Intense |
| 20 | 6.5 | Intense |
| 21 | 6.5 | Intense |
| 22 | 6.5 | Intense |
| 23 | 6.5 | Intense |
| 24 | 6.5 | Intense |
| 25 | 6.5 | Intense |
| 26 | 6.5 | Intense |
| 27 | 6.5 | Intense |
| 28 | 6.5 | Intense |
| 29 | 6.5 | Intense |
| 30 | 6.5 | Intense |
| 31 | 6.5 | Intense |
Hazard calendar for Galveston
None of Galveston's seasonal hazards are active in May. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.
Galveston sits in the Atlantic hurricane belt; the season peaks August–October.
Is May a good time to visit Galveston?
Our two travel scores rate May for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).
May is one of the better times to visit Galveston for general sightseeing. The water and warmth also suit a beach or pool day.
What to pack for Galveston in May
From May's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In May, Galveston sees daytime highs around 78°F and nights near 74°F. Pack sun protection. Worth having: light clothes and a windbreaker. About 8 days see rain.
Sea temperature near Galveston in May
The nearest coast averages about 78°F in May — 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.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°F) | 58 | 59 | 64 | 71 | 78 | 83 | 85 | 86 | 84 | 78 | 69 | 62 |
| Comfort | Bracing | Cool | Cool | Refreshing | Warm | Tropical | Tropical | Tropical | Tropical | Warm | Refreshing | Cool |
| Sea temperature (°F) | Comfort | |
|---|---|---|
| Jan | 58 | Bracing |
| Feb | 59 | Cool |
| Mar | 64 | Cool |
| Apr | 71 | Refreshing |
| May | 78 | Warm |
| Jun | 83 | Tropical |
| Jul | 85 | Tropical |
| Aug | 86 | Tropical |
| Sep | 84 | Tropical |
| Oct | 78 | Warm |
| Nov | 69 | Refreshing |
| Dec | 62 | Cool |
UV index in Galveston in May
Clear-sky midday UV in May 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 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.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 4 | 6 | 7 | 10 | 10 | 11 | 11 | 11 | 9 | 6 | 5 | 4 |
| Level | Moderate | High | High | Extreme | Extreme | Extreme | Extreme | Extreme | Very high | High | High | Moderate |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 4 | Moderate |
| Feb | 6 | High |
| Mar | 7 | High |
| Apr | 10 | Extreme |
| May | 10 | Extreme |
| Jun | 11 | Extreme |
| Jul | 11 | Extreme |
| Aug | 11 | Extreme |
| Sep | 9 | Very high |
| Oct | 6 | High |
| Nov | 5 | High |
| Dec | 4 | Moderate |
Air quality in Galveston in May
Average fine-particle pollution (PM2.5) through the year — so you can see where May 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).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 6 | 7 | 8 | 9 | 12 | 16 | 19 | 13 | 10 | 6 | 6 | 6 |
| Level | Good | Good | Good | Good | Good | Moderate | Moderate | Moderate | Good | Good | Good | Good |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 6 | Good |
| Feb | 7 | Good |
| Mar | 8 | Good |
| Apr | 9 | Good |
| May | 12 | Good |
| Jun | 16 | Moderate |
| Jul | 19 | Moderate |
| Aug | 13 | Moderate |
| Sep | 10 | Good |
| Oct | 6 | Good |
| Nov | 6 | Good |
| Dec | 6 | Good |
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.
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 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).