| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 18° | 7.7° | 96.4mm | 9.5 | 75 |
| February | 19.8° | 9.8° | 62.7mm | 8.6 | 82 |
| March | 23.2° | 13.3° | 78.8mm | 8.5 | 83 |
| April | 26.4° | 16.6° | 92.8mm | 7.7 | 85 |
| May | 30.3° | 20.9° | 137.1mm | 7.6 | 72 |
| June | 33.1° | 23.9° | 138.5mm | 10.1 | 55 |
| July | 34° | 24.8° | 127.8mm | 9.5 | 53 |
| August | 34.5° | 25° | 138.2mm | 9.6 | 51 |
| September | 32.1° | 22.8° | 144.3mm | 9.7 | 60 |
| October | 28.1° | 17.7° | 129.1mm | 7.4 | 81 |
| November | 22.9° | 12.4° | 94.7mm | 8.6 | 83 |
| December | 19.2° | 9° | 100.4mm | 8.9 | 80 |
January in Houston averages a daily high of 18°C with nights around 7.7°C. Expect roughly 9.5 wet days totalling 96.4mm. Comfortable conditions for being outdoors all day.
February in Houston averages a daily high of 19.8°C with nights around 9.8°C. Expect roughly 8.6 wet days totalling 62.7mm. Comfortable conditions for being outdoors all day.
March in Houston averages a daily high of 23.2°C with nights around 13.3°C. Expect roughly 8.5 wet days totalling 78.8mm. Comfortable conditions for being outdoors all day.
April in Houston averages a daily high of 26.4°C with nights around 16.6°C. Expect roughly 7.7 wet days totalling 92.8mm. Comfortable conditions for being outdoors all day.
May in Houston averages a daily high of 30.3°C with nights around 20.9°C. Expect roughly 7.6 wet days totalling 137.1mm. Generally workable, with some weather to plan around.
June in Houston averages a daily high of 33.1°C with nights around 23.9°C. Expect roughly 10.1 wet days totalling 138.5mm. Generally workable, with some weather to plan around.
July in Houston averages a daily high of 34°C with nights around 24.8°C. Expect roughly 9.5 wet days totalling 127.8mm. Demanding conditions — pack for it and plan indoor options.
August in Houston averages a daily high of 34.5°C with nights around 25°C. Expect roughly 9.6 wet days totalling 138.2mm. Demanding conditions — pack for it and plan indoor options.
September in Houston averages a daily high of 32.1°C with nights around 22.8°C. Expect roughly 9.7 wet days totalling 144.3mm. Generally workable, with some weather to plan around.
October in Houston averages a daily high of 28.1°C with nights around 17.7°C. Expect roughly 7.4 wet days totalling 129.1mm. Comfortable conditions for being outdoors all day.
November in Houston averages a daily high of 22.9°C with nights around 12.4°C. Expect roughly 8.6 wet days totalling 94.7mm. Comfortable conditions for being outdoors all day.
December in Houston averages a daily high of 19.2°C with nights around 9°C. Expect roughly 8.9 wet days totalling 100.4mm. 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. Houston peaks at 85.
Based on 30 years of records, February–April scores highest for comfort in Houston, balancing daytime temperature against rainfall.
August is the warmest, averaging a daily high of 34.5°C.
September is the wettest, averaging 144.3mm of rain across roughly 9.7 wet days.
January is the coolest month, with average daily highs around 18°C.