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Galveston, Texas climate
Cfa Humid subtropical
Galveston has a seasonal warm-temperate climate (Humid subtropical, Köppen Cfa). The hottest month is August with an average daily high near 34°C, while the coldest is January averaging around 8°C at night. Around 1529 mm of precipitation falls each year, peaking in September (186 mm) and easing off in February (77 mm).
Temperature & precipitation
Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figuresClear vs cloudy days
Share of days each month that are clear, partly cloudy or cloudy · 1991–2020 · hover a month for the day countsGalveston climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 18 | 20 | 23 | 26 | 29 | 32 | 33 | 34 | 31 | 28 | 23 | 19 |
| Avg temp (°C) | 13 | 15 | 18 | 21 | 25 | 28 | 29 | 29 | 27 | 22 | 17 | 14 |
| Avg low (°C) | 8 | 10 | 13 | 16 | 21 | 24 | 24 | 24 | 22 | 17 | 12 | 9 |
| Precipitation (mm) | 122 | 77 | 84 | 107 | 130 | 166 | 111 | 169 | 186 | 147 | 115 | 115 |
| Snowfall (cm) | — | — | — | — | — | — | — | — | — | — | — | 1 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 18 | 20 | 23 | 26 | 29 | 32 |
| Avg temp (°C) | 13 | 15 | 18 | 21 | 25 | 28 |
| Avg low (°C) | 8 | 10 | 13 | 16 | 21 | 24 |
| Precipitation (mm) | 122 | 77 | 84 | 107 | 130 | 166 |
| Snowfall (cm) | — | — | — | — | — | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 33 | 34 | 31 | 28 | 23 | 19 |
| Avg temp (°C) | 29 | 29 | 27 | 22 | 17 | 14 |
| Avg low (°C) | 24 | 24 | 22 | 17 | 12 | 9 |
| Precipitation (mm) | 111 | 169 | 186 | 147 | 115 | 115 |
| Snowfall (cm) | — | — | — | — | — | 1 |
How often — frequency of weather events
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 10 | 9 | 9 | 8 | 7 | 10 | 10 | 10 | 10 | 8 | 8 | 11 |
| Days with high ≥ 32°C (days) | — | — | 0.1 | 0.2 | 2 | 14 | 23 | 23 | 11 | 2 | — | — |
| Days with low ≤ 0°C (days) | 4 | 1 | 0.6 | — | — | — | — | — | — | 0.0 | 1 | 3 |
| Days with snowfall ≥ 2.5 cm (days) | — | — | — | — | — | — | — | — | — | — | — | 0.1 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 10 | 9 | 9 | 8 | 7 | 10 |
| Days with high ≥ 32°C (days) | — | — | 0.1 | 0.2 | 2 | 14 |
| Days with low ≤ 0°C (days) | 4 | 1 | 0.6 | — | — | — |
| Days with snowfall ≥ 2.5 cm (days) | — | — | — | — | — | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 10 | 10 | 10 | 8 | 8 | 11 |
| Days with high ≥ 32°C (days) | 23 | 23 | 11 | 2 | — | — |
| Days with low ≤ 0°C (days) | — | — | — | 0.0 | 1 | 3 |
| Days with snowfall ≥ 2.5 cm (days) | — | — | — | — | — | 0.1 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 62 | 65 | 62 | 58 | 56 | 49 | 47 | 47 | 46 | 41 | 51 | 62 |
| Clear days (≤ 30% cloud) | 6 | 6 | 7 | 7 | 7 | 10 | 10 | 10 | 12 | 14 | 9 | 7 |
| Partly cloudy days (30–70%) | 10 | 7 | 10 | 10 | 12 | 12 | 14 | 15 | 11 | 10 | 10 | 9 |
| Cloudy days (≥ 70%) | 15 | 16 | 15 | 13 | 12 | 8 | 7 | 7 | 8 | 7 | 11 | 15 |
| Relative humidity (%) | 82 | 83 | 82 | 80 | 79 | 77 | 76 | 75 | 76 | 76 | 80 | 82 |
| Wind speed (m/s) | 3.6 | 3.6 | 3.6 | 3.8 | 3.6 | 3.2 | 2.8 | 2.6 | 2.9 | 3.3 | 3.5 | 3.6 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 62 | 65 | 62 | 58 | 56 | 49 |
| Clear days (≤ 30% cloud) | 6 | 6 | 7 | 7 | 7 | 10 |
| Partly cloudy days (30–70%) | 10 | 7 | 10 | 10 | 12 | 12 |
| Cloudy days (≥ 70%) | 15 | 16 | 15 | 13 | 12 | 8 |
| Relative humidity (%) | 82 | 83 | 82 | 80 | 79 | 77 |
| Wind speed (m/s) | 3.6 | 3.6 | 3.6 | 3.8 | 3.6 | 3.2 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 47 | 47 | 46 | 41 | 51 | 62 |
| Clear days (≤ 30% cloud) | 10 | 10 | 12 | 14 | 9 | 7 |
| Partly cloudy days (30–70%) | 14 | 15 | 11 | 10 | 10 | 9 |
| Cloudy days (≥ 70%) | 7 | 7 | 8 | 7 | 11 | 15 |
| Relative humidity (%) | 76 | 75 | 76 | 76 | 80 | 82 |
| Wind speed (m/s) | 2.8 | 2.6 | 2.9 | 3.3 | 3.5 | 3.6 |
Methodology & sources
Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Houston Nwso (NOAA GHCN station USC00414333), about 34 km from the city centre.
Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.