San Antonio Weather in May
May in San Antonio brings high temperatures, with highs of 24°C (75°F) and nights dropping to 17°C (63°F). With perfect weather conditions overall, it's a good time to visit.
Rainfall in San Antonio in May
On average, there are about 8 days with rain during this month, averaging 22 mm (0.9 in). Rain this month is fairly typical, a standard mix of wet and dry days with no particularly heavy or persistent showers.
Temperature in San Antonio in May
The temperature in San Antonio in May is perfect. Daytime highs reach 24°C (75°F), with nights dropping to 17°C (63°F). Conditions stay fairly consistent through the month, making it easier to plan what to wear. With overnight lows of 17°C (63°F), evenings can feel noticeably cooler than the daytime. An extra layer is a good idea, though the cool air makes for a good night's sleep.
Sunshine in San Antonio in May
There are approximately 275 hours of sunshine this month, resulting in mostly clear days.
Average water temperature in May
At 19°C (66°F), the water is getting there — comfortable enough for most swimmers, though those used to warmer seas may still find it a touch cool.Our weather planner can help you find worldwide destinations with pleasant weather during this period. March, April, May, June, September, October and November typically offer the best weather for San Antonio.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Spain, check out our San Antonio's climate page.
San Antonio Temperature in May
Min Temperature
17°C (63°F)
Max Temperature
24°C (75°F)
Water Temperature
19°C (66°F) *
Chance of Rain
28%
Precipitation
22 mm (0.9 in)
Rainy days
8 days
Humidity
70% *
Sunshine
275 hours *
Percentage Sunshine
70% *
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in San Antonio typically rise from around 21°C (70°F) at the start of May to approximately 24°C (75°F) by the end. Nights are pleasant, with lows typically ranging from 13°C (55°F) to 17°C (63°F).
Average temperatures in May
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in May
Historical weather for San Antonio in May
Browse day-by-day weather records for San Antonio spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
San Antonio historical weather extremes in May
Based on weather observations in San Antonio between 1976 and 2026, these are the recorded extremes during May.
- San Antonio recorded its highest May temperature of 30°C (86°F) on May 14, 2015.
- San Antonio experienced its chilliest May day on May 1, 1976, reaching only 13°C (55°F).
- Nighttime temperatures dropped to 8°C (46°F) on May 2, 2017, marking the coldest May night on record.
Best Places in Spain in May
Find out more about the weather in Spain and which places have the best travel conditions in this month. See all of Spain in May →
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What to Wear in San Antonio in May
For San Antonio in May, you'll want flexible clothing. It's wise to pack cotton shirts, comfortable shorts, and a pair of jeans for cooler evenings. A light sweater or jacket is useful for air-conditioned spaces (like buses) or unexpected cool moments. Some rain is possible, so pack something to handle light showers. With water temperatures around 19°C (66°F), swimming conditions are excellent. Pack your swimsuit, goggles, and maybe some water shoes. And with plenty of sunshine hours, don’t forget sunglasses, sunscreen, and maybe a sun hat.What To Do in San Antonio in May
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Spain, check out our San Antonio's climate page.
Temperature Rainfall Sunshine Humidity Water Temp
See the full San Antonio climate overview or explore weather in Spain.
