30-year climate normals

Bexar County Climate and Weather Averages

Hottest month — August

97.5°

average daily high. The coldest month is January, averaging a low of 40.3°F.

Bexar County gets 31.27" of precipitation a year, and 30% of it falls in May, Jun, Jul.

Temperature through the year

Each bar spans the average daily low to the average daily high for that month.

Month	Avg high	Avg low	Precip
January	64.2°	40.3°	2.14"
February	68.3°	43.8°	1.72"
March	74.9°	50.6°	2.49"
April	81.5°	58.0°	2.00"
May	87.7°	65.5°	3.63"
June	93.4°	71.4°	3.44"
July	96.3°	72.7°	2.21"
August	97.5°	72.7°	2.01"
September	91.8°	67.9°	3.45"
October	83.6°	58.9°	3.30"
November	72.9°	49.1°	2.46"
December	65.4°	41.6°	2.42"

Rainfall by month

Precipitation is spread fairly evenly through the year here, with 30% falling in the wettest three months (May, Jun, Jul).

January 2.14"

February 1.72"

March 2.49"

April 2.00"

May 3.63"

June 3.44"

July 2.21"

August 2.01"

September 3.45"

October 3.30"

November 2.46"

December 2.42"

Annual total 31.27"

What this climate costs you

Degree days measure how hard a building has to work to stay comfortable. They are the reason two identical houses have very different power bills, and they are the link between the weather here and what you pay every month.

Cooling degree days How much air conditioning the climate demands 3,144

Heating degree days How much heating the climate demands 1,446

Approximate annual cooling cost At 16.44¢/kWh, Texas average $517

Approximate annual electric heating cost Lower where heating is gas rather than electric $83

These are rough planning figures from degree days and the state electricity price, not a bill estimate. House size, insulation and fuel type move them a lot. See the full cost of owning a home in Bexar County, where electricity is one line of eight.

Common questions

What is the weather like in Bexar County?

Bexar County averages a high of 97.5°F in August and a low of 40.3°F in January. Annual precipitation is 31.27 inches, with essentially no snow.

When is the rainy season in Bexar County?

The wettest stretch is May, Jun, Jul, which accounts for 30% of the year's precipitation. Precipitation is relatively evenly distributed across the year.

How hot does it get in Bexar County?

The average daily high in August, the hottest month, is 97.5°F. That drives 3,144 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in Bexar County?

Effectively no. Measurable snowfall is rare in Bexar County.

Sources

Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station AUSTIN SAN ANTONIO, TX US (USW00012971), 34.4 miles from the county centroid.
Heating and cooling degree days — NOAA, same station and period.
Electricity price — US Energy Information Administration, Electric Power Monthly Table 5.6.A, Texas residential average.
Wet-season share is the wettest three consecutive months as a percentage of annual precipitation, calculated from the monthly normals.