Galveston weather in May: Galveston, Texas: normal highs, lows, rain and records for May
Galveston in May has a normal high of 84°F and a normal low of 72°F, a daily mean of 78°F, rising from 81°F on the 1st to 87°F by the 31st. Measurable precipitation falls on 5 days in a normal May, 3.04 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 29°C and low of 22°C, 77 mm of precipitation in May.
- NOAA stationGalveston Scholes Field
- Station IDUSW00012923
- Location29.27°N 94.86°W
- Elevation5 ft (2 m)
- Population53,538
- Jan 63° 49°
- Feb 66° 52°
- Mar 72° 58°
- Apr 78° 65°
- May 84° 72°
- Jun 90° 78°
- Jul 91° 80°
- Aug 92° 80°
- Sep 89° 76°
- Oct 82° 69°
- Nov 72° 59°
- Dec 66° 52°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Galveston in May?
The normal high is 84°F and the normal low 72°F, for a daily mean of 78.2°F. May is 6.7°F warmer than April and 5.6°F cooler than June. May is the 5th warmest month of the year in Galveston and the 9th wettest. Across the month the normal high rises 6°F, from 81°F on May 1 to 87°F on May 31. From one year to the next May's mean temperature typically moves about 1.5°F either way (NOAA's standard deviation), so roughly two Mays in three average between 77°F and 80°F.
Bars above: each day's normal high to low. Columns below: the chance of 0.01 inch or more of precipitation that day, on a scale of 0 to 100% (highest 22%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| May 1 | 81°F | 69°F | 17% | 10% |
| May 8 | 82°F | 70°F | 17% | 11% |
| May 15 | 84°F | 72°F | 18% | 11% |
| May 22 | 85°F | 74°F | 19% | 12% |
| May 31 | 87°F | 76°F | 22% | 14% |
Every day of May: normal high, low and chance of precipitation (warmest afternoon May 31, coldest night May 1)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| May 1 | 81°F | 69°F | 17% | 10% | 13 h 20 min |
| May 2 | 81°F | 69°F | 17% | 10% | 13 h 20 min |
| May 3 | 81°F | 69°F | 17% | 10% | 13 h 20 min |
| May 4 | 81°F | 69°F | 17% | 10% | 13 h 20 min |
| May 5 | 82°F | 70°F | 17% | 10% | 13 h 20 min |
| May 6 | 82°F | 70°F | 17% | 10% | 13 h 20 min |
| May 7 | 82°F | 70°F | 17% | 10% | 13 h 20 min |
| May 8 | 82°F | 70°F | 17% | 11% | 13 h 30 min |
| May 9 | 82°F | 71°F | 17% | 11% | 13 h 30 min |
| May 10 | 83°F | 71°F | 17% | 11% | 13 h 30 min |
| May 11 | 83°F | 71°F | 17% | 11% | 13 h 30 min |
| May 12 | 83°F | 71°F | 17% | 11% | 13 h 30 min |
| May 13 | 83°F | 72°F | 17% | 11% | 13 h 30 min |
| May 14 | 84°F | 72°F | 18% | 11% | 13 h 30 min |
| May 15 | 84°F | 72°F | 18% | 11% | 13 h 40 min |
| May 16 | 84°F | 73°F | 18% | 11% | 13 h 40 min |
| May 17 | 84°F | 73°F | 18% | 11% | 13 h 40 min |
| May 18 | 84°F | 73°F | 18% | 11% | 13 h 40 min |
| May 19 | 85°F | 73°F | 18% | 11% | 13 h 40 min |
| May 20 | 85°F | 74°F | 18% | 12% | 13 h 40 min |
| May 21 | 85°F | 74°F | 18% | 12% | 13 h 40 min |
| May 22 | 85°F | 74°F | 19% | 12% | 13 h 40 min |
| May 23 | 86°F | 74°F | 19% | 12% | 13 h 40 min |
| May 24 | 86°F | 75°F | 19% | 12% | 13 h 50 min |
| May 25 | 86°F | 75°F | 20% | 13% | 13 h 50 min |
| May 26 | 86°F | 75°F | 20% | 13% | 13 h 50 min |
| May 27 | 87°F | 75°F | 20% | 13% | 13 h 50 min |
| May 28 | 87°F | 76°F | 21% | 13% | 13 h 50 min |
| May 29 | 87°F | 76°F | 21% | 14% | 13 h 50 min |
| May 30 | 87°F | 76°F | 21% | 14% | 13 h 50 min |
| May 31 | 87°F | 76°F | 22% | 14% | 13 h 50 min |
- Normal high
- 84°FMay average
- Normal low
- 72°FMay average
- Precipitation
- 3.04 inmonth total
- Days with precipitation
- 50.01 inch or more
- Days at 90°F or more
- 1
- Daylight
- 13 h 20 min to 13 h 50 minMay 1 to May 31
- Days at 70°F or more
- 31
- Days at 80°F or more
- 26
- Sunshine
- 82%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00012923; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Galveston in May?
On a given May day the chance of 0.01 inch or more is 18% on average, highest around May 31 (22%). In all, 3.04 in falls on 5 days of a normal May, 1 of them with an inch or more.
In a normal May in Galveston, 1 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00012923.
What are the records for May in Galveston?
The warmest May temperature on Galveston's official record (since 1874) is 94°F, on May 3, 1984; the coldest is 50°F, on May 3, 2013. The wettest May brought 11.03 in (1991).
The May mean against the 1991-2020 normal of 78.2°F: 2021 77.4°F (−0.8), 2022 83.0°F (+4.8), 2023 78.0°F (−0.2), 2024 80.0°F (+1.8), 2025 79.2°F (+1.0), 2026 76.5°F (−1.7). 3 of 6 ran warmer than normal.
| May | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 77.4°F | −0.8°F | 6.57 in |
| 2022 | 83.0°F | +4.8°F | 2.99 in |
| 2023 | 78.0°F | −0.2°F | 3.22 in |
| 2024 | 80.0°F | +1.8°F | 4.39 in |
| 2025 | 79.2°F | +1.0°F | 6.19 in |
| 2026 | 76.5°F | −1.7°F | 4.29 in |
Source: records: ACIS, NWS threaded record GLSthr; recent months: ACIS, station USW00012923. Records and recent months use complete months only.
How does May in Galveston compare across Texas?
Across the 321 places PlainClimate covers in Texas, May normal highs run from 78°F in Hartley to 98°F in Terlingua; Galveston's is 84°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.