Weather in San Antonio in May
May in San Antonio is warm with average temperatures around 25.3°C (77.5°F). Moderate rainfall of 100mm spread over 10 days.
Data Note: Temperature values are 2001–2020 satellite/reanalysis grid averages from NASA POWER and may differ from airport station normals by a few degrees.
Temperature
High
31.6°C
88.9°F
Low
19.0°C
66.2°F
Precipitation
100 mm
3.9 inches
~10 rainy days
Conditions
Humidity
68%
Comparison to Adjacent Months
May is 3.8°C warmer than April, 37mm wetter than April.
May is 3.2°C cooler than June, 29mm wetter than June.