San Antonio, Texas Weather
Fireflies pulse through the magnolias. Day 76 of spring. Read this microseason across nine climate regions →
San Antonio weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 3Light Rain55%0.08″89°72°—
- ThursdayJun 4Light Drizzle18%0.02″84°72°-5°
- FridayJun 5Light Showers66%—85°73°+1°
- SaturdayJun 6Light Drizzle66%—86°72°+1°
- SundayJun 7Light Drizzle45%—94°73°+8°
- MondayJun 8Overcast14%—96°74°+2°
- TuesdayJun 9Overcast13%—94°74°-2°
Ozone at AQI 44 now. AQI flat over the last 6 hours (within ±3 points). With UV 7.8 peaking around 1 PM under partly cloudy skies, surface ozone likely climbs to AQI 32 by mid-afternoon.
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion.
What's driving it
Ozone × UV × Sky
Ozone at AQI 44 now. With UV 7.8 peaking around 1 PM under partly cloudy skies, surface ozone likely climbs to AQI 32 by mid-afternoon.
- Present
- AQI 44
- UV peak
- 7.8 at 1 PM
- Sky at peak
- partly cloudy
- Projected peak
- AQI 32
PM × Wind × Precip
PM2.5 at 7.7 µg/m³ (AQI 43) with a 0.79 fine-to-coarse ratio and 6 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.79
- Wind
- light
- Recent rain
- 0h in last 6h
- Pattern
- stagnant smoke
Trends
Seven days of AQI and PM2.5.
Hourly air-quality data from the Copernicus Atmosphere Monitoring Service, charted across the past and next several days. Dashed lines mark the AQI breakpoints at 50 (Good → Moderate) and 100 (Moderate → Unhealthy for Sensitive Groups).
The higher the clouds, the finer the weather.
- Moonrise
- 3:52 AM
- Moonset
- 2:07 PM
- In sign
- ♑︎ Capricorn
Fireflies pulse through the magnolias
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: Jun 1–5
- Planting window: Harvest spring lettuce before it bolts. Sow heat-tolerant greens.
Right now in the garden
Peak growing season
As of June 3, 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.
SPC Convective Outlook
Storm Prediction Center — San Antonio
SPC has placed San Antonio in the General Thunderstorms category for severe thunderstorms today.
- TODAYTSTMGeneral Thunderstorms
- TOMORROWTSTMGeneral Thunderstorms
- DAY 3TSTMGeneral Thunderstorms
Thunderstorms possible. Not severe, but capable of producing lightning and brief heavy rain.
Source: NOAA / NWS Storm Prediction Center categorical convective outlook. Outlooks are re-issued multiple times per day; this page reflects the most recent SPC polygons covering the city’s coordinates.
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
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- 78255
- 78254
- 78208
- 78201
- 78202
- 78203
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- 78230
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- 78225
- 78228
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- 78206
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- 78299