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May Weather in Houston, United States

Last updated: June 24, 2025

In May, the average temperature in Houston, United States hovers around 18°C (65°F), with a range that can drop to a chilly 2°C (36°F) and soar up to a warm 33°C (91°F). Expect about 188 mm (7.4 in) of precipitation spread over 15 days, creating a backdrop of 83% average humidity. Plan accordingly to make the most of your visit!

May Temperature in Houston

In May in Houston, the average temperature is 18°C (65°F), with maximums reaching 33°C (91°F) and minimums dropping as low as 2°C (36°F). This makes Houston an ideal destination for travelers seeking a mix of comfortable days and cooler evenings.

May Weather in Houston: Daily Temperature Highs, Lows, and Averages

The chart illustrates May temperature patterns in Houston, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Houston, May typically has an average temperature of 18°C (65°F), with highs reaching up to 33°C (91°F) and lows dropping to around 2°C (36°F).
JanFebMarAprMayJunJulAugSepOctNovDec343748556574787572584541
Data source: Temperature data for Houston generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

May Precipitation in Houston

In Houston in May, the precipitation amount is 188 mm (7.4 in) over the course of 15 days.

May Precipitation Trends in Houston

The chart displays monthly precipitation patterns in Houston, with values for each month alongside May’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how May’s conditions compare to those of other months. In Houston, May typically receives around 188 mm (7.4 inches) of precipitation spread over approximately 15 days.
JanFebMarAprMayJunJulAugSepOctNovDec73100138170188687597421176863
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Houston

In Houston in May, humidity is 83%. With an average temperature of 18°C (65°F), this humidity feels like walking through a warm, damp blanket, making it quite uncomfortable for traveling.

May Average Humidity in Houston

This chart illustrates the average monthly humidity levels in Houston, with May’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In May, average humidity in Houston is approximately 83%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec83%81%80%80%83%83%76%69%68%72%83%87%
Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in Houston

In Houston in May, the maximum UV index reaches 11, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's essential to take precautions. For more details, you can check the Hourly UV Index in Houston.

Maximum UV Index Levels in Houston for May

The chart shows the monthly maximum UV Index (UVI) for Houston in May, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In May, the maximum UV index in Houston typically reaches 11, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec36710111111109753
Data source: Houston May UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How May Weather in Houston Compares to Other Months

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.

This table compares monthly weather conditions in Houston, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather1°C (35°F)73 mm (2.9 inches)83%moderate
February Weather3°C (38°F)100 mm (3.9 inches)81%high
March Weather9°C (48°F)138 mm (5.4 inches)80%high
April Weather13°C (55°F)170 mm (6.7 inches)80%very high
May Weather18°C (65°F)188 mm (7.4 inches)83%extreme
June Weather23°C (74°F)67 mm (2.7 inches)83%extreme
July Weather26°C (78°F)75 mm (2.9 inches)76%extreme
August Weather24°C (76°F)97 mm (3.8 inches)69%very high
September Weather22°C (72°F)42 mm (1.6 inches)68%very high
October Weather15°C (58°F)117 mm (4.6 inches)72%high
November Weather7°C (45°F)68 mm (2.7 inches)83%moderate
December Weather5°C (41°F)63 mm (2.5 inches)86%moderate

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