Last updated: June 24, 2025
In Houston, United States, the average temperature in May hovers around 9°C (48°F). Expect chilly conditions, with minimums dipping to -3°C (26°F) and highs reaching up to 22°C (71°F). During this time, you'll likely experience 99 mm (3.9 in) of precipitation spread over 21 days, along with a notably high average humidity of 88%. Be prepared for a damp and cool month!
In May in Houston, the average temperature is 9°C (48°F), with maximums reaching 22°C (71°F) and minimums dropping as low as -3°C (26°F). This variation in temperature makes Houston a place of diverse weather, so travelers should pack accordingly for both warmer days and chilly evenings.
In Houston in May, the precipitation amount is 99 mm (3.9 in) during a span of 21 days.
In Houston in May, humidity is 88%. With an average temperature of 9°C (48°F), this humidity feels like a damp chill settling into your bones, making outdoor exploration feel heavy and oppressive.
In Houston in May, the maximum UV index is 6, which corresponds to a high Exposure Category. The time to burn is approximately 25 minutes. To find the hourly UV index in Houston, you can refer to this Hourly UV Index in Houston.
UV Risk Categories
Weather in Houston varies notably across the year, with each month offering distinct climate conditions. This page compares May’s weather to other months in Houston, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -12°C (11°F) | 38 mm (1.5 inches) | 94% | low |
| February Weather | -9°C (16°F) | 49 mm (1.9 inches) | 93% | low |
| March Weather | -6°C (21°F) | 42 mm (1.7 inches) | 91% | moderate |
| April Weather | 2°C (36°F) | 43 mm (1.7 inches) | 85% | moderate |
| May Weather | 9°C (48°F) | 99 mm (3.9 inches) | 88% | high |
| June Weather | 13°C (55°F) | 98 mm (3.9 inches) | 95% | high |
| July Weather | 15°C (60°F) | 103 mm (4.0 inches) | 102% | high |
| August Weather | 13°C (56°F) | 152 mm (6.0 inches) | 100% | moderate |
| September Weather | 9°C (48°F) | 106 mm (4.2 inches) | 96% | moderate |
| October Weather | 2°C (37°F) | 109 mm (4.3 inches) | 91% | low |
| November Weather | -7°C (20°F) | 63 mm (2.5 inches) | 95% | low |
| December Weather | -8°C (18°F) | 76 mm (3.0 inches) | 96% | low |