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August is the hottest month in Houston TX, with an average high of 94°F / 34°C; January is the coldest (64°F / 18°C). June is the wettest month, averaging 6.1 in / 155 mm of precipitation.
| Month | High °F / °C | Low °F / °C | Precip in / mm | Wet days |
|---|---|---|---|---|
| Jan | 64 / 18 | 46 / 8 | 4.1 / 104 | 8 |
| Feb | 67 / 20 | 50 / 10 | 2.8 / 72 | 6 |
| Mar | 73 / 23 | 56 / 13 | 3.3 / 83 | 6 |
| Apr | 79 / 26 | 62 / 16 | 4.1 / 104 | 5 |
| May | 86 / 30 | 69 / 21 | 5.4 / 138 | 6 |
| Jun | 91 / 33 | 75 / 24 | 6.1 / 155 | 9 |
| Jul | 93 / 34 | 76 / 25 | 4.6 / 116 | 7 |
| Aug | 94 / 34 | 76 / 25 | 5.4 / 138 | 8 |
| Sep | 89 / 32 | 73 / 23 | 5.7 / 146 | 8 |
| Oct | 82 / 28 | 64 / 18 | 5.8 / 147 | 6 |
| Nov | 73 / 23 | 54 / 12 | 3.9 / 99 | 7 |
| Dec | 66 / 19 | 48 / 9 | 4.3 / 110 | 7 |
Extremes since 1930: highest 109°F / 43°C (August 27, 2023), lowest 5°F / -15°C (January 23, 1940).
Daylight lasts about 13.9 hours in June and 10.1 hours in December.
Data: Meteostat — Houston / Olcott, 1991–2020 averages.
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