San Antonio
Texas, USA
Long-term weather forecast
Long-term weather forecast

May weather forecast and Climate
San Antonio, TX

Buildings in San Antonio, Texas, with a calm view of the bridges across the waterfront
Buildings in San Antonio, Texas, with a calm view of the bridges across the waterfront
May is the beginning of the hot season in San Antonio as the temperatures regularly cross 80°F (26.7°C). The average high temperature is 87°F (30.6°C) with at least ten days crossing 90°F (32.2°C), while the nights average 67°F (19.4°C).
Humidity at 71% is at its peak of the year as San Antonio experiences frequent thunderstorms accompanied by rain. Outdoor activities abound in the daily 13 hours of sunlight, but rainfall to the tune of 4" (101.6mm) with an occasional heavy downpour mandates protection in the form of umbrellas and raincoats.
  • The average high temperature in May: 86°F

Warmest months (with the highest average high temperature) are July and August (95°F).
The month with the lowest average high temperature is January (61°F).

  • The average low temperature in May: 66°F

Months with the highest average low temperature are July and August (73°F).
The coldest month (with the lowest average low temperature) is January (37°F).

  • The average rainfall in May: 3.7"

The wettest month (with the highest rainfall) is May (3.7").
Driest months (with the lowest rainfall) are January, March, July and December (1.5").

  • The average rainfall days in May: 8 days

The month with the highest number of rainy days is May (8 days).
Months with the lowest number of rainy days are July and August (5 days).

  • The average daylight in May: 14h

Months with the longest days are May, June and July (Average daylight: 14h).
The month with shortest days is December (Average daylight: 10h).

  • The average sunshine in May: 7h

The month with most sunshine is July (Average sunshine: 10h).
Months with least sunshine are January and December (Average sunshine: 5).

  • The average UV index in May: 11

Months with the highest UV index are May, June, July and August (UV index 11).
Months with the lowest UV index are January and December (UV index 4).