San Antonio, Texas weather

Current conditions, hourly and 7-day forecast, official alerts, and air quality for San Antonio, United States. Coordinates 29.42, -98.49 · America/Chicago.

“Use my location” asks your browser for your coordinates so we can load your local forecast and any official warnings for your area. Your coordinates are used for that request only — they are not stored on our servers, sold, or used to build a profile. If your browser blocks location, we fall back to an approximate city-level lookup from your IP address.

WARNING

Flash Flood Warning

WeatherSignal priority 80/100

Flash Flood Warning issued August 28 at 9:09PM CDT until August 29 at 12:15AM CDT by NWS Austin/San Antonio TX

Official severity:: Severe
Urgency:: Immediate
Certainty:: Likely
Issued by:: NWS Austin/San Antonio TX
Starts:: 8/29/2026, 2:09:00 AM
Expires:: 8/29/2026, 5:15:00 AM
Area:: Bexar, TX; Comal, TX

Official recommended action

Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles. Be especially cautious at night when it is harder to recognize the dangers of flooding. Be aware of your surroundings and do not drive on flooded roads.

Read the full official alert

San Antonio, Texas

United States · America/Chicago

82°F

Clear sky

Feels like 88° · High 97° / Low 77°

Precipitation: 0%
Wind: 5 SEmph
Humidity: 71%
Visibility: 0.0mi
Pressure: 1015hPa
Dew point: 72°F
UV index: 9.8
Air quality: 83

Sunrise 1 AM Sunset 1 PM Cloud cover 9% Wind direction SE

Source updated: 2:41:32 AM · WeatherSignal checked: 2:41:32 AM

Source: Open-Meteo (national weather-service models)

WeatherSignal Right Now

Plain-language answers calculated from this location's own forecast values — see how each one works on our methodology page.

Today's Weather Score

36/100

Rough day

Starts at 100 and subtracts published penalties for heat, cold, rain, wind, UV, humidity, low visibility, and active official alerts.

Feels like 88° — warm-8
UV index 9.8 — very high-6
Dew point 72° — oppressive humidity-10
Visibility 0.0 mi-10
Active Flash Flood Warning-30

How this score is calculated

Right now

It's 82° but feels like 88°, clear sky, 71% humidity. 1 official alert in effect — see the warning above.

Today's high is about the same as the rest of the week.

Umbrella or nah?
Nah(Favourable)
Nothing in the next 12 hours reaches a 40% chance of rain. Peak chance is 0%.
Why
- Peak precipitation probability: 0%
- Total expected precipitation: 0.00″
Best time today
4 AM(Favourable)
4 AM has the most comfortable combination of temperature, rain chance, wind, and humidity in the remaining daylight hours.
Why
- Feels like 78°
- Rain chance 0%
- Wind 3 mph
- Humidity 88%
Car wash check
Go for it(Favourable)
No hour in the next 48 hours reaches a 50% chance of rain or measurable precipitation.
Why
- No precipitation at or above 50% chance within 48 hours
- Current wind: 5 mph
Dog walk window
4 AM(Favourable)
4 AM is the calmest hour in the 25–85° feels-like range with rain chance under 40%.
Why
- Feels like 78°
- Rain chance 0%
Cookout check
Green light(Favourable)
Between 4 PM and 9 PM: up to 0% rain chance, wind to 11 mph, feels like 93–97°.
Why
- Evening peak rain chance: 0%
- Evening peak wind: 11 mph
Windows down?
Crack them(Mixed)
Feels like 88°, 0% rain chance, wind 5 mph. Comfortable range used here: 58–84° with rain chance under 20% and wind under 18 mph.
Why
- Feels like 88°
- Rain chance 0%
- Wind 5 mph
Hair weather
Frizz risk high(Unfavourable)
Relative humidity is 71% with a 72° dew point. Moisture in the air is what swells hair strands, so dew point matters more than temperature.
Why
- Humidity 71%
- Dew point 72°

These are WeatherSignal calculations, not official forecasts or warnings. They never override guidance from your national weather service.

What this means

Generated from the forecast values above using fixed rules — not an AI guess.

A Flash Flood Warning issued by NWS Austin/San Antonio TX is active for Bexar, TX.
No significant precipitation is expected in the next 24 hours.
Heat builds to 97°F on Saturday.
UV index is very high today — limit midday sun exposure.

Next 24 hours

Will it rain during your commute? When does the storm arrive?

Hourly forecast for the next 24 hours
Time	Condition	Temp	Feels	Precip %	Amount	Wind	Humidity
10 PM	Clear sky	82°	87°	0%	0.00″	5 ESE	72%
11 PM	Clear sky	81°	86°	0%	0.00″	5 SSE	74%
12 AM	Clear sky	80°	85°	0%	0.00″	4 SE	79%
1 AM	Clear sky	80°	85°	0%	0.00″	3 ESE	82%
2 AM	Clear sky	79°	85°	0%	0.00″	3 SE	83%
3 AM	Clear sky	79°	84°	0%	0.00″	3 SE	85%
4 AM	Clear sky	78°	78°	0%	0.00″	3 SE	88%
5 AM	Clear sky	78°	78°	0%	0.00″	2 E	90%
6 AM	Clear sky	77°	77°	0%	0.00″	3 ENE	92%
7 AM	Clear sky	77°	77°	0%	0.00″	4 E	93%
8 AM	Clear sky	78°	78°	0%	0.00″	5 E	92%
9 AM	Clear sky	81°	88°	0%	0.00″	5 ESE	84%
10 AM	Clear sky	84°	92°	0%	0.00″	4 SE	73%
11 AM	Clear sky	88°	95°	0%	0.00″	5 SSE	59%
12 PM	Clear sky	91°	97°	0%	0.00″	6 SSE	50%
1 PM	Clear sky	93°	99°	0%	0.00″	7 SSE	44%
2 PM	Clear sky	95°	101°	0%	0.00″	7 SSE	41%
3 PM	Mainly clear	97°	97°	0%	0.00″	7 SSE	38%
4 PM	Clear sky	97°	97°	0%	0.00″	7 SE	36%
5 PM	Mainly clear	97°	97°	0%	0.00″	7 SE	35%
6 PM	Clear sky	96°	96°	0%	0.00″	7 SE	36%
7 PM	Clear sky	95°	95°	0%	0.00″	7 SE	37%
8 PM	Mainly clear	93°	96°	0%	0.00″	11 SE	40%
9 PM	Clear sky	88°	93°	0%	0.00″	11 SSE	52%

7-day forecast

Confidence decreases the further out you look.

Today
Clear sky
97° / 77°
Precip:
0% · 0.00″
Wind:
7 mph
UV:
9.8
Sun:
1 AM–1 PM
Sun, Aug 30
Clear sky
98° / 77°
Precip:
0% · 0.00″
Wind:
11 mph
UV:
9.7
Sun:
1 AM–1 PM
Mon, Aug 31
Clear sky
95° / 77°
Precip:
0% · 0.00″
Wind:
13 mph
UV:
9.6
Sun:
1 AM–1 PM
Tue, Sep 1
Clear sky
96° / 78°
Precip:
0% · 0.00″
Wind:
8 mph
UV:
0.0
Sun:
1 AM–1 PM
Wed, Sep 2
Clear sky
98° / 79°
Precip:
0% · 0.00″
Wind:
8 mph
UV:
0.0
Sun:
1 AM–1 PM
Lower confidence — long-range outlook, not a certainty.
Thu, Sep 3
Clear sky
98° / 80°
Precip:
0% · 0.00″
Wind:
8 mph
UV:
0.0
Sun:
1 AM–1 PM
Lower confidence — long-range outlook, not a certainty.
Fri, Sep 4
Clear sky
95° / 80°
Precip:
0% · 0.00″
Wind:
10 mph
UV:
0.0
Sun:
1 AM–1 PM
Lower confidence — long-range outlook, not a certainty.

Forecasts describe likely conditions, not guaranteed outcomes. Official warnings from your national weather service always take precedence over anything shown here.

Air quality

US EPA AQI · Moderate

AQI: 83
Primary: Ozone
PM2.5: 9.3µg/m³
PM10: 10.3µg/m³
Ozone: 88.0µg/m³
Dust: 0.0µg/m³

Unusually sensitive people should consider shortening intense outdoor activity.

Air-quality guidance comes from the published category definitions of the source scale. WeatherSignal does not provide medical advice.

Source updated: not provided · WeatherSignal checked: 2:41:31 AM

Source: Open-Meteo Air Quality (CAMS / US EPA scale)

Radar & storm tracking

Animated precipitation radar centred on this area.

Air quality detail

Pollutants, category, and official guidance.

Travel & outdoor planning

Rain-free windows, commute weather, best time outside.

San Antonio, Texas weather

Flash Flood Warning

San Antonio, Texas

WeatherSignal Right Now

Today's Weather Score

Right now

What this means

Next 24 hours

7-day forecast

Air quality

Donate to keep the site running