San Antonio, FL climate
San Antonio has warm winters and warm summers, with plenty of rain. A typical July afternoon reaches 91°, a January night drops to 47°, and snow is almost unheard of.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in San Antonio feels like
Winter
Spring
Summer
Fall
San Antonio weather by month
Average highs, lows, rain and snow for every month, from NOAA’s 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 70° | 47° | 3.0" | 0 | 8 | 0 | 53° – 65° |
| February | 73° | 50° | 2.4" | 0 | 7 | 0 | 53° – 71° |
| March | 77° | 54° | 3.1" | 0 | 7 | 0 | 59° – 72° |
| April | 83° | 59° | 2.8" | 0 | 6 | 0 | 66° – 76° |
| May | 88° | 65° | 3.1" | 0 | 7 | 0 | 73° – 79° |
| June | 90° | 71° | 8.2" | 0 | 15 | 0 | 79° – 84° |
| July | 91° | 72° | 8.2" | 0 | 17 | 0 | 80° – 83° |
| August | 91° | 73° | 8.4" | 0 | 18 | 0 | 80° – 83° |
| September | 89° | 71° | 6.4" | 0 | 13 | 0 | 77° – 83° |
| October | 84° | 64° | 2.8" | 0 | 8 | 0 | 71° – 79° |
| November | 77° | 56° | 1.8" | 0 | 6 | 0 | 62° – 73° |
| December | 72° | 51° | 2.5" | 0 | 7 | 0 | 51° – 71° |
| Year | 82° | 61° | 52.6" | 0.0" | 119 | 0 |
“Wet days” have at least 0.01" of rain or melted snow. “Snow on ground” counts days with 1" or more. The 30-year range is the coldest and warmest that month’s average temperature got between 1991 and 2020.
Rain and snow in San Antonio
San Antonio gets 53 inches of rain and melted snow a year. August is the wettest month and November the driest. Rain or snow falls on about 119 days a year.
A year-round growing season
Heating and cooling a home in San Antonio
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In San Antonio, 16% of that work is heating and 84% is cooling, so air conditioning is the bigger bill.
Degree days measure how far each day’s average temperature falls below or rises above 65°, added up over a year. Source: NOAA station normals.
San Antonio and its neighbors
San Antonio borders 2 towns with climate data. January nights across them vary by 0.6°. St. Leo has the coldest January nights (47°) and Pasadena Hills the hottest July afternoons (91°). San Antonio’s January low is 47° and its July high 91°.
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value.
How San Antonio compares
Compared with every U.S. town and city on TownTapestry, each counted once.
Warmer than it used to be
The last 30 years in San Antonio averaged 1.4° warmer than the 1900s. The biggest change is in December (+2.0°). The shift is larger than in 63% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at San Antonio’s spot on NOAA’s grid
How much a month can swing
A normal is an average, and real years wander around it. December swings the most: between 1991 and 2020 its average temperature ranged from 51° to 71°. July is the most reliable, staying within 3°.
Common questions about San Antonio’s climate
What is the coldest month in San Antonio?
January, with a typical high of 70° and a low of 47°.
What is the hottest month in San Antonio?
August, with a typical high of 91° and a low of 73°. About 114 days a year reach 90°.
How much snow does San Antonio get?
Almost none. A normal year brings 0.0 inches.
When is the first frost in San Antonio?
Frost is uncommon. Only 81% of years see a night at 32° or below.
What is the rainiest month in San Antonio?
August, with 8.4 inches of rain and melted snow. The year totals 53 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for San Antonio itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Saint Leo, FL (1 mi) away. Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.