San Antonio Average Rainfall by Month

This page shows the average precipitation (including snowfall) in each month of the year in San Antonio, Texas. It is based on NOAA data for the years 1991–2020.

Average temperature by month

What's the Rainiest Month in San Antonio?

In San Antonio, May has the greatest precipitation of any month. On average, San Antonio gets 4.4 inches of precipitation in May.

However, March is the month with the greatest chance of precipitation. 27.4% of days in March will have at least some rain.

What's the Driest Month in San Antonio?

In San Antonio, February has the least precipitation of any month. On average, San Antonio gets 1.74 inches of precipitation in February.

August is the month with the lowest chance of precipitation. 15.2% of days in August will have measurable rain.

Month	Precipitation	% Chance
January	1.96 in	22.4
February	1.74 in	26.1
March	2.30 in	27.4
April	2.42 in	21.4
May	4.40 in	26.9
June	3.28 in	23.2
July	2.41 in	16.2
August	2.15 in	15.2
September	3.88 in	23.0
October	3.75 in	20.5
November	2.08 in	21.4
December	2.01 in	24.1
Year	32.37 in	22.3

Weather Station Details

Years	Station	Coordinates
1947–2024	San Antonio International Airport	location
1893–1946	San Antonio Nursery	location