Updated October 2026
San Antonio Missions National Historical Park Weather by Month
San Antonio Missions National Historical Park is warmest in August, when the nearest NOAA climate station averages a high of 98°F and a low of 76°F, and coldest in January, with an average high of 65°F and an average low of 42°F. May is the wettest month, with about 3.9 inches of precipitation.
These figures are NOAA's 1991–2020 climate normals, the 30-year average for each calendar month, from the nearest long-record weather station, 3.2 miles from the park's reference point. A single station cannot describe a whole park: temperatures elsewhere in San Antonio Missions National Historical Park can differ from these, particularly with elevation.
Warmest month
Aug
98°F avg high
Coldest month
Jan
42°F avg low
Wettest month
May
3.9 in avg
Longest days
Jun
13.9 h of daylight
Average weather at San Antonio Missions by month
| Month | Avg high | Avg low | Precipitation | Daylight |
|---|---|---|---|---|
| January | 65°F | 42°F | 1.8 in | 10.3 h |
| February | 69°F | 47°F | 1.6 in | 11.0 h |
| March | 75°F | 54°F | 2.4 in | 11.8 h |
| April | 82°F | 60°F | 2.3 in | 12.7 h |
| May | 88°F | 68°F | 3.9 in | 13.5 h |
| June | 94°F | 74°F | 3.2 in | 13.9 h |
| July | 96°F | 75°F | 1.8 in | 13.7 h |
| August | 98°F | 76°F | 2.5 in | 13.1 h |
| September | 91°F | 71°F | 3.2 in | 12.2 h |
| October | 84°F | 62°F | 3.0 in | 11.3 h |
| November | 73°F | 51°F | 2.0 in | 10.5 h |
| December | 66°F | 44°F | 2.1 in | 10.1 h |
| Year total | 29.8 in |
NOAA 1991–2020 climate normals from station USW00012970, 3.2 miles from the park's reference point. Daylight is the monthly average, computed from the park's latitude. Each month links to how crowded San Antonio Missions is at that time of year.
San Antonio Missions weather by season
Winter: December to February
Average highs bottom out at 65°F in January, between 66°F in December and 69°F in February, with average lows between 42°F and 47°F. Together the three months average 5.5 inches of precipitation, about 18% of the yearly total and less than in any other season. Daylight is at its shortest, about 10.1 hours in December.
Spring: March to May
Average highs climb from 75°F in March to 88°F in May, with average lows between 54°F and 68°F. Together the three months average 8.6 inches of precipitation, about 29% of the yearly total and more than in any other season. Daylight lengthens from about 11.8 hours in March to 13.5 in May.
Summer: June to August
Average highs climb from 94°F in June to 98°F in August, with average lows near 75°F. The average high is 90°F or hotter in all three months. Together the three months average 7.5 inches of precipitation, about 25% of the yearly total. Daylight is at its longest, about 13.9 hours in June.
Fall: September to November
Average highs fall from 91°F in September to 73°F in November, with average lows between 51°F and 71°F. The average high is 90°F or hotter in September. Together the three months average 8.2 inches of precipitation, about 28% of the yearly total. Daylight shortens from about 12.2 hours in September to 10.5 in November.
What the National Park Service says about the weather
Over the course of a year, the temperature typically varies from 40°F to 95°F and is rarely below 29°F or above 100°F. The warm season lasts from May through September with an average daily high temperature above 90°F and a low of 75°F. The cold season lasts from November through February with an average daily high below 68°F and an average low of 40°F. The relative humidity ranges from 40-80% over the course of the year, which can be very uncomfortable to many people.
Weather description courtesy of the National Park Service — official park site.
Today's forecast for San Antonio Missions
Averages describe a typical month, not this week. For current conditions and the seven-day outlook, the National Weather Service issues a forecast for the park's reference point at 29.31°N, 98.43°W. It covers that one spot, so other elevations in the park can differ from it, as they do from the averages above.
National Weather Service forecast for San Antonio Missions National Historical Park →
Weather and crowds together
August, the warmest month, sees about 1.0× the visitors of the park's average month. July is the busiest month of the year and November the quietest. To see those crowds set against the weather for all twelve months, read the best time to visit San Antonio Missions National Historical Park. For hotels, cabins and rentals close to the park, see where to stay near San Antonio Missions.
Where to stay near San Antonio Missions
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Frequently Asked Questions
August is the warmest month at San Antonio Missions National Historical Park, with an average high of 98°F and an average low of 76°F. That is the 1991–2020 average at the nearest long-record NOAA station, 3.2 miles from the park's reference point. Temperatures inside the park can differ, particularly with elevation.
January is the coldest month at San Antonio Missions National Historical Park, with an average low of 42°F and an average high of 65°F, based on NOAA 1991–2020 climate normals.
May is the wettest month, with about 3.9 inches of precipitation. February is the driest, at about 1.6 inches. The station records about 29.8 inches of precipitation in an average year.
Daylight at San Antonio Missions National Historical Park runs from about 10.1 hours a day in December to about 13.9 hours in June, computed from the park's latitude.
Weather at nearby parks
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Sources: NOAA NCEI U.S. Climate Normals 1991–2020 (station USW00012970), daylight computed from latitude, weather description from the National Park Service, crowd levels from National Park Service Visitor Use Statistics (1983–2025). Updated 2026-10-11. Lodging results are provided by Stay22; WhenToVisitParks may earn a commission from bookings, at no extra cost to you.