| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 16.9° | 9.7° | 91.7mm | 9.7 | 71 |
| February | 18.3° | 11.4° | 48.2mm | 8.1 | 78 |
| March | 21.8° | 15.1° | 76.4mm | 7.5 | 85 |
| April | 25° | 18.8° | 56.2mm | 6 | 88 |
| May | 28.4° | 22.7° | 75.4mm | 5.8 | 83 |
| June | 31.4° | 25.9° | 110.7mm | 8.2 | 66 |
| July | 32.2° | 26.7° | 104.9mm | 8.6 | 62 |
| August | 32.9° | 27° | 126.6mm | 8.7 | 59 |
| September | 31.1° | 24.9° | 171.6mm | 9.3 | 65 |
| October | 27.3° | 20.6° | 118mm | 7.4 | 84 |
| November | 22.2° | 15.2° | 94.1mm | 8.4 | 83 |
| December | 18.4° | 11.2° | 91.7mm | 9.6 | 76 |
January in Galveston averages a daily high of 16.9°C with nights around 9.7°C. Expect roughly 9.7 wet days totalling 91.7mm. Generally workable, with some weather to plan around.
February in Galveston averages a daily high of 18.3°C with nights around 11.4°C. Expect roughly 8.1 wet days totalling 48.2mm. Comfortable conditions for being outdoors all day.
March in Galveston averages a daily high of 21.8°C with nights around 15.1°C. Expect roughly 7.5 wet days totalling 76.4mm. Comfortable conditions for being outdoors all day.
April in Galveston averages a daily high of 25°C with nights around 18.8°C. Expect roughly 6 wet days totalling 56.2mm. Comfortable conditions for being outdoors all day.
May in Galveston averages a daily high of 28.4°C with nights around 22.7°C. Expect roughly 5.8 wet days totalling 75.4mm. Comfortable conditions for being outdoors all day.
June in Galveston averages a daily high of 31.4°C with nights around 25.9°C. Expect roughly 8.2 wet days totalling 110.7mm. Generally workable, with some weather to plan around.
July in Galveston averages a daily high of 32.2°C with nights around 26.7°C. Expect roughly 8.6 wet days totalling 104.9mm. Generally workable, with some weather to plan around.
August in Galveston averages a daily high of 32.9°C with nights around 27°C. Expect roughly 8.7 wet days totalling 126.6mm. Generally workable, with some weather to plan around.
September in Galveston averages a daily high of 31.1°C with nights around 24.9°C. Expect roughly 9.3 wet days totalling 171.6mm. Generally workable, with some weather to plan around.
October in Galveston averages a daily high of 27.3°C with nights around 20.6°C. Expect roughly 7.4 wet days totalling 118mm. Comfortable conditions for being outdoors all day.
November in Galveston averages a daily high of 22.2°C with nights around 15.2°C. Expect roughly 8.4 wet days totalling 94.1mm. Comfortable conditions for being outdoors all day.
December in Galveston averages a daily high of 18.4°C with nights around 11.2°C. Expect roughly 9.6 wet days totalling 91.7mm. Comfortable conditions for being outdoors all day.
Each month scores out of 100. It starts at 100 and loses points for daytime highs outside a 20–27°C band, for wet days, and for nights below 2°C. Nothing else is weighted in — no crowd data, no prices, no opinion. Galveston peaks at 88.
Based on 30 years of records, March–May scores highest for comfort in Galveston, balancing daytime temperature against rainfall.
August is the warmest, averaging a daily high of 32.9°C.
September is the wettest, averaging 171.6mm of rain across roughly 9.3 wet days.
January is the coolest month, with average daily highs around 16.9°C.