San Antonio, TX weather in May
Expect warm, humid weather with some rain in San Antonio in May, with highs near 87°F and lows near 66°F. Rain falls on about 8 days.
- Normal high
- 87°F
- Normal low
- 66°F
- Wet days
- 8
- 4.4 in total
- Muggy days
- 19
- dew point 65°F+
How May changes from start to finish
| May 1 | May 31 | |
|---|---|---|
| Normal high | 83°F | 90°F |
| Normal low | 62°F | 70°F |
| Chance of a wet day | 25% | 26% |
| Sunrise / sunset | 6:51 am / 8:10 pm | 6:34 am / 8:28 pm |
| Daylight | 13.3 h | 13.9 h |
Chance of a wet day: average for the first and last 7 days of the month. Times are local clock time (Central Time).
A typical May day
- 6 am69°Fdew point 66°F
- 9 am76°Fdew point 66°F
- Noon83°Fdew point 65°F
- 3 pm86°Fdew point 64°F
- 6 pm84°Fdew point 64°F
- 9 pm77°Fdew point 65°F
NOAA hourly normals (local standard time) from San Antonio Kelly AFB (6 mi away); average wind 9 mph.
What kind of days to expect
- Comfortable dayshigh 65-80°F and dew point under 60°F2 of 31
- Hot dayshigh 90°F or more12 of 31
- Muggy daysdaily mean dew point 65°F or more19 of 31
- Wet daysat least 0.01 in of rain or melted snow8 of 31
- Notable rainat least 0.10 in5 of 31
- Freezing nightslow 32°F or below0 of 31
Average days per May, counted from daily records for each year 1991-2020.
Rain in May
Normal precipitation is 4.4 in; a dry May brings about 1.8 in and a wet one about 5.7 in (25th and 75th percentiles). About 3 days bring half an inch or more, and about 2 an inch or more.
How May varies from year to year
- Warmest May, 1991-20201996: average high 93°F
- Coolest May1992: average high 83°F
- Wettest May2013: 13.2 in
- Driest May2003: 0.1 in
- Highest reading104°F (May 31, 2004)
- Lowest reading42°F (May 4, 2013)
From the station's daily records with NOAA quality flags removed; most recent date shown when a reading repeats.
May compared with April and June
| April | May | June | |
|---|---|---|---|
| Normal high | 80°F | 87°F | 92°F |
| Normal low | 58°F | 66°F | 73°F |
| Wet days | 6 | 8 | 7 |
| Comfortable days | 8 | 2 | 0 |
| Daylight | 12.9 h | 13.6 h | 14.0 h |
Highs change by +7°F from April and +5°F into June.
Nearby alternatives in May
- Warmer: Laredo, TX146 mi · high 94°F · 5 wet days
- Drier: Laredo, TX146 mi · high 94°F · 5 wet days
How San Antonio ranks in May
- Normal high39th warmest of 378 cities; 13th of 38 in Texas
- Wet days151st driest of 378
- Comfortable days300th most of 339
What to pack for San Antonio in May
- Light, breathable clothing – highs near 87°F and about 19 muggy days
- A rain jacket or umbrella – rain on about 8 days
Heating and cooling
May has 3 heating degree days and 359 cooling degree days (base 65°F), 8% of the year's total heating and cooling demand.
Questions
How hot is San Antonio in May?
The normal high is 87°F and the normal low is 66°F. From 1991 to 2020 the hottest May reading was 104°F (May 31, 2004).
Does it rain a lot in San Antonio in May?
About 8 days in May have at least 0.01 in of precipitation, and the normal total is 4.4 in. The wettest May in 1991-2020 was in 2013 (13.2 in); the driest was in 2003 (0.1 in).
Is May a good time to visit San Antonio?
May ranks 8th of 12 months on our comfort score for San Antonio (47 out of 100). It has about 2 comfortable days and about 12 days at 90°F or hotter. The best months are February, March and November.
Where the numbers come from
- Temperature, rain, snowfall, snow depth and frost dates: San Antonio Intl Airport (USW00012921), 8.3 mi N of the city center, 789 ft (140 ft higher than the city). NOAA normals and daily records, 1991-2020.
- Humidity and wind by hour: San Antonio Kelly AFB (USW00012909), 6.1 mi WSW of the city center, 682 ft . NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: San Antonio International Airport (722530-12921), 8.3 mi N of the city center, 799 ft (150 ft higher than the city). Hourly observations, 1991-2020.
- Not available for this location: cloud cover (no station close enough or similar enough in elevation).