Monthly climate guide
Houston weather in May
May in Houston is typically hot, with average daytime highs around 31°C (87°F) and night-time lows near 19°C (67°F). The month usually brings about 147 mm of rain (wet) and is a mix of sun and cloud. Daytime highs are 4°C warmer than April and 3°C cooler than June.
What stands out in May
- It's wetter than a typical month in Houston — roughly 45% more rain than average.
- Seasonally, May counts as late spring in Houston.
- Houston is usually about 2°C warmer than Dallas, 360 km away, in May.
- It's humid — around 74% — so the heat feels heavier.
It's usually the wettest month of the year.
Avg high
31°C
87°F
Avg low
19°C
67°F
Rainfall
147 mm
wet
Humidity
74%
relative
Sky
52%
cloud · a mix of sun and cloud
Houston weather by month
Show the monthly averages as a table
| Month | Avg high | Avg low | Rain | Humidity | Cloud cover |
|---|---|---|---|---|---|
| January | 17°C / 62°F | 5°C / 41°F | 93 mm | 80% | 58% |
| February | 19°C / 67°F | 8°C / 46°F | 64 mm | 81% | 66% |
| March | 23°C / 74°F | 12°C / 53°F | 85 mm | 79% | 62% |
| April | 27°C / 80°F | 15°C / 59°F | 93 mm | 76% | 56% |
| May | 31°C / 87°F | 19°C / 67°F | 147 mm | 74% | 52% |
| June | 34°C / 93°F | 23°C / 74°F | 116 mm | 73% | 45% |
| July | 35°C / 94°F | 24°C / 75°F | 87 mm | 72% | 44% |
| August | 36°C / 97°F | 24°C / 76°F | 136 mm | 69% | 43% |
| September | 33°C / 91°F | 22°C / 71°F | 118 mm | 74% | 45% |
| October | 29°C / 83°F | 16°C / 61°F | 103 mm | 74% | 34% |
| November | 22°C / 72°F | 11°C / 51°F | 73 mm | 77% | 50% |
| December | 18°C / 65°F | 7°C / 45°F | 101 mm | 81% | 63% |
What to pack for May
- Light, breathable clothing (cotton or linen)
- A sun hat and high-SPF sunscreen
- A refillable water bottle
- An extra layer — evenings are noticeably cooler than afternoons
- A compact umbrella or packable rain jacket
- Water-resistant shoes
Is May a good time to visit Houston?
Compare the months in the chart above to find your ideal window.
Best time to visit Houston →Other United States cities in May
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Houston weather in May. WeatherCompare, 2026 (NASA POWER / ERA5, 2011–2020 monthly averages). https://weathercompare.eu/weather/usa/houston/may
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Houston in May: quick answers
Is May a good time to visit Houston?
May is one of the wetter months in Houston, with about 147 mm of rain. You can still go: pack a rain jacket and keep plans flexible.
How warm is Houston in May?
Average highs are about 31°C (87°F) and average lows about 19°C (67°F), based on 10 years of daily data.
Does it rain a lot in Houston in May?
Houston typically gets around 147 mm of rain in May — wet. It's usually the wettest month of the year.
Figures are long-term averages for the area around Houston (NASA POWER / ERA5, 2011–2020), not a forecast for a specific year. For upcoming days, see the live multi-source forecast.