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

August 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
August is usually the hottest month in San Antonio with average temperatures in the 75°F (23.9°C) to 96°F (35.6°C). The heat does not subside even by the end of the month.
Sunny and bright days adorn the month with a drop in the relative humidity. The scorching heat is unbearable at times, but the tourists beat it by engaging in fun water activities in the theme parks or swimming in the river. August sees a drop in the pattern of heavy rainfall in the summer months and is dry with only 2.1" (53.3mm) of rain.
  • The average high temperature in August: 95°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 August: 73°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 August: 2.2"

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 August: 5 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 August: 13h

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 August: 9h

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 August: 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).