Weather in San Antonio, Texas
Roses open on the Piedmont edge. Day 59 of spring. Read this microseason across nine climate regions →
- TodayMay 16Overcast—90°70°
- SundayMay 17Thunderstorm12%92°75°
- MondayMay 18Thunderstorm10%93°75°
- TuesdayMay 19Thunderstorm57%93°76°
- WednesdayMay 20Showers57%79°70°
- ThursdayMay 21Thunderstorm71%85°69°
- FridayMay 22Heavy Drizzle65%90°68°
- PM 2.5
- 7.9 μg/m³
- PM 10
- 11.7 μg/m³
- NO₂
- 2.8 μg/m³
- Ozone
- 79.0 μg/m³
- UV Index
- 0.0 Low
When the dew is on the grass, rain will never come to pass.
- Moonrise
- 11:58 AM
- Moonset
- 1:42 AM
- In sign
- ♊︎ Gemini
Roses open on the Piedmont edge
San Antonio at a glance
- Today vs. normal: 4°F below the seasonal normal for this latitude
- Last frost: February 12 (climatological average for this latitude)
- Microseason: 28 of 72, May 16–20
- Planting window: Direct sow okra, melons, and southern peas. Thin carrot rows.
Right now in the garden
Peak growing season
As of May 17, the growing season is at its peak — frost is months away. Continue succession-planting beans and summer squash. Start fall brassicas (broccoli, cabbage, kale) from seed indoors for transplanting in late summer.
Planting calendar
| Month | Plant | Harvest |
|---|---|---|
| January | — | — |
| February | lettuce, peas, spinach, radishes | — |
| March | lettuce, peas, spinach, radishes, tomatoes, peppers, beans, squash | — |
| April | tomatoes, peppers, beans, squash | — |
| May | tomatoes, peppers, beans, squash | lettuce, peas, radishes |
| June | — | lettuce, peas, radishes |
| July | — | tomatoes, beans, summer squash |
| August | — | tomatoes, beans, summer squash |
| September | — | tomatoes, beans, summer squash |
| October | fall brassicas, garlic (overwinter), carrots | winter squash, tomatoes (last) |
| November | fall brassicas, garlic (overwinter), carrots | — |
| December | — | — |
A year in weather
August brings San Antonio's warmest temperatures (~85°F mean) while January delivers the coldest (~52°F). Rainfall peaks in May (4.4 inches) and drops to its lowest point in February (1.9 inches).
| Month | Mean temp | Precip | Rainy days |
|---|---|---|---|
| January | 52° | 2.2″ | 4 |
| February | 56° | 1.9″ | 3 |
| March | 62° | 2.4″ | 4 |
| April | 69° | 2.3″ | 3 |
| May | 76° | 4.4″ | 4 |
| June | 82° | 3.5″ | 4 |
| July | 84° | 2.4″ | 4 |
| August | 85° | 2.4″ | 3 |
| September | 79° | 3.9″ | 5 |
| October | 71° | 3.9″ | 5 |
| November | 60° | 2.5″ | 3 |
| December | 53° | 2.1″ | 4 |
Regional context
San Antonio belongs to a humid subtropical climate region. This places the city among a cohort that shares similar temperature ranges, seasonal patterns, and growing conditions across nearby cities.
Similar climates: Houston, TX, Dallas, TX, Austin, TX, Fort Worth, TX, McAllen, TX.
Naturalist notes
Late May brings the peak bloom of prickly pear cactus, their yellow flowers opening across the South Texas landscape.
Painted buntings return to San Antonio in late April, the males' brilliant blue heads and red underparts appearing at backyard feeders.
Frequently asked
- When does it freeze in San Antonio?
- San Antonio's last spring frost typically falls around mid-February, and the first fall frost arrives around mid-December.
- What is the rainy season in San Antonio?
- May is the wettest month with about 4.4 inches of rain on average; the city receives roughly 34 inches annually.
- What is the warmest month in San Antonio?
- August is typically warmest, averaging about 85°F.
- What is the coldest month in San Antonio?
- January is typically coldest, averaging about 52°F.
- When can I start a vegetable garden in San Antonio?
- Cool-season crops (peas, lettuce) can be sown around the last spring frost (mid-February); warm-season crops (tomatoes, peppers) wait until 1–2 weeks after.
- How many rainy days does San Antonio get?
- San Antonio averages about 47 rainy days per year.
- What hardiness zone is San Antonio?
- San Antonio's USDA hardiness zone is determined by its lowest average winter temperature; check the USDA's online lookup with the city ZIP for the current zone designation.
Climate
San Antonio, Texas sits in a humid subtropical climate zone. January temperatures hover near 52°F while July averages 84°F — a 32°F seasonal swing.
Throughout the year, San Antonio receives about 34 inches of precipitation spread over roughly 47 rainy days.
Latitude (29.5°N), proximity to large water bodies, and elevation set the rhythm of the year. These factors shape what grows here, when frost is likely, and what the weather story looks like day to day.
ZIP codes in San Antonio
- 78112
- 78239
- 78259
- 78258
- 78252
- 78251
- 78250
- 78257
- 78256
- 78255
- 78254
- 78208
- 78201
- 78202
- 78203
- 78204
- 78205
- 78207
- 78245
- 78242
- 78248
- 78231
- 78230
- 78233
- 78232
- 78235
- 78234
- 78237
- 78238
- 78209
- 78109
- 78266
- 78264
- 78260
- 78219
- 78218
- 78217
- 78216
- 78215
- 78214
- 78213
- 78212
- 78211
- 78210
- 78244
- 78247
- 78240
- 78249
- 78073
- 78023
- 78222
- 78223
- 78220
- 78221
- 78226
- 78227
- 78224
- 78225
- 78228
- 78229
- 78206
- 78241
- 78246
- 78265
- 78268
- 78269
- 78270
- 78278
- 78279
- 78280
- 78283
- 78284
- 78285
- 78288
- 78289
- 78291
- 78292
- 78293
- 78294
- 78295
- 78296
- 78297
- 78298
- 78299