Weather in San Antonio - 14-day forecast

Detailed weather forecast for San Antonio, United States of America: daytime and night temperature, rain, sunrise and sunset - today and for the next two weeks.

Forecast for the next days in San Antonio

today🌧️ 37°💧 1.4 mm

Sun🌤️ 37°💧 2.4 mm

Mon☀️ 36°💧 0.1 mm

Tue☀️ 37°💧 0.3 mm

Wed🌧️ 36°💧 1.6 mm

Thu🌧️ 35°💧 1.9 mm

Fri🌧️ 34°💧 10.4 mm

Sat🌧️ 26°💧 3 mm

Forecast vs 1991-2020 climate normal

How does the current forecast compare with normal?

We compare the coming days with weather usually observed at this time of year.

NASA POWER

Saturday 5 Sept in San Antonio, the forecast high is 37°C. Typical daytime temperatures at this time of year range from 31°C to 37°C, so it will be warmer than usual. It is warmer than 82% of similar days.

Saturday 5 Sept

37°Cwarmer than usual

usually 31°C–37°C

warmer than 82% of similar days

night: exceptionally warm rain: typical rainfall wind: typical

Sunday 6 Sept

37°Cwarmer than usual

usually 30°C–37°C

warmer than 81% of similar days

night: exceptionally warm rain: typical rainfall wind: typical

Monday 7 Sept

36°Cwarmer than usual

usually 30°C–37°C

warmer than 73% of similar days

night: exceptionally warm rain: typical rainfall wind: exceptionally strong

Tuesday 8 Sept

37°Cwarmer than usual

usually 30°C–37°C

warmer than 80% of similar days

night: exceptionally warm rain: typical rainfall wind: stronger than usual

Wednesday 9 Sept

36°Cwarmer than usual

usually 30°C–36°C

warmer than 75% of similar days

night: exceptionally warm rain: typical rainfall wind: typical

Thursday 10 Sept

35°Cwarmer than usual

usually 30°C–36°C

warmer than 72% of similar days

night: warmer than usual rain: typical rainfall wind: lighter than usual

Friday 11 Sept

34°Cnear normal

usually 30°C–36°C

night: exceptionally warm rain: exceptionally wet wind: typical

How warm was this week in previous years?

Each bar shows the average daily high during the same 7-day period in each year.

swipe to see more years →

cooler yearstypical rangewarmer years2026 forecastcurrent forecast

From 1981 to 2025, the 5-11 Sept period averaged 33°C by day. The coolest year was 2001 (29°C) and the warmest was 2023 (40°C). The current forecast averages 36°C - higher than in 78% of historical years.

Historical reference: NASA POWER daily gridded data (MERRA-2), the 1991-2020 normal and a +/- 7-day calendar window. The typical range is the 20th-80th percentile. This is not a city weather-station reading and does not change the current forecast. NASA POWER Daily API.

14-day forecast - San Antonio

San Antonio - 14-day weather forecast infographic

San Antonio 30 & 45-day weather - long-range outlook

Next 15 days · forecast

34°

around 29° at night · days with rain: 8

Weeks 3-4 · avg for September

34°

around 23° at night · rain chance 30%

Weeks 5-7 · avg for October

31°

around 18° at night · rain chance 22%

The 30 & 45-day outlook for San Antonio: the next 15 days are a numerical forecast updated daily - on average 34° by day and 29° at night. Further out we rely on multi-year climate averages: around 34° in September, and about 31° in October. Forecasts beyond two weeks are indicative only.

Day-by-day forecast for San Antonio

Saturday5 September 2026

🌧️37°light rain

sunrise 07:13 · sunset 19:51 · night 30° · evening 35° · rain 1.38 mm · humidity 36% · wind 5 m/s · clouds 24%

Sunday6 September 2026

🌤️37°a few clouds

sunrise 07:14 · sunset 19:50 · night 30° · evening 35° · rain 2.38 mm · humidity 35% · wind 5 m/s · clouds 16%

Monday7 September 2026

☀️36°clear sky

sunrise 07:14 · sunset 19:49 · night 31° · evening 37° · rain 0.13 mm · humidity 36% · wind 8 m/s · clouds 6%

Tuesday8 September 2026

☀️37°clear sky

sunrise 07:15 · sunset 19:48 · night 31° · evening 36° · rain 0.27 mm · humidity 31% · wind 6 m/s · clouds 1%

Wednesday9 September 2026

🌧️36°light rain

sunrise 07:15 · sunset 19:47 · night 27° · evening 34° · rain 1.56 mm · humidity 37% · wind 5 m/s · clouds 72%

Thursday10 September 2026

🌧️35°light rain

sunrise 07:16 · sunset 19:45 · night 24° · evening 35° · rain 1.92 mm · humidity 37% · wind 4 m/s · clouds 85%

Friday11 September 2026

🌧️34°moderate rain

sunrise 07:16 · sunset 19:44 · night 25° · evening 36° · rain 10.41 mm · humidity 41% · wind 6 m/s · clouds 80%

Saturday12 September 2026

🌧️26°light rain

sunrise 07:17 · sunset 19:43 · night 28° · evening 30° · rain 2.97 mm · humidity 81% · wind 6 m/s · clouds 100%

Sunday13 September 2026

🌧️31°moderate rain

sunrise 07:18 · sunset 19:42 · night 28° · evening 31° · rain 9.3 mm · humidity 56% · wind 7 m/s · clouds 96%

Monday14 September 2026

🌧️33°light rain

sunrise 07:18 · sunset 19:41 · night 29° · evening 33° · rain 0.57 mm · humidity 50% · wind 7 m/s · clouds 44%

Tuesday15 September 2026

🌧️33°light rain

sunrise 07:19 · sunset 19:39 · night 30° · evening 33° · rain 0.78 mm · humidity 48% · wind 5 m/s · clouds 38%

Wednesday16 September 2026

🌤️33°scattered clouds

sunrise 07:19 · sunset 19:38 · night 30° · evening 34° · rain 0.78 mm · humidity 46% · wind 5 m/s · clouds 28%

Thursday17 September 2026

🌤️34°scattered clouds

sunrise 07:20 · sunset 19:37 · night 29° · evening 32° · rain 2.22 mm · humidity 43% · wind 6 m/s · clouds 29%

Friday18 September 2026

🌧️35°light rain

sunrise 07:20 · sunset 19:36 · night 29° · evening 34° · rain 0.15 mm · humidity 33% · wind 6 m/s

Saturday19 September 2026

☀️35°clear sky

sunrise 07:21 · sunset 19:34 · night 30° · evening 35° · humidity 28% · wind 6 m/s · clouds 1%

UV index in San Antonio - is it safe to sunbathe?

Today the UV index in San Antonio is 8 (very high) - unprotected fair skin can burn in about 25 minutes. SPF 50, long sleeves and shade between 10:00 and 16:00.

San Antonio weather through the year

Warmest, driest months on average: January, February, March, April.

Upcoming public holidays in United States of America: Labour Day — 7 September · Veterans Day — 11 November · Thanksgiving Day — 26 November.

Nearby and related places

HoustonDallasMonterreyOklahoma CityWashingtonPhoenixNew York

FAQ - San Antonio weather

What is the weather like in San Antonio today?

Today it is about 37° during the day and 30° at night, light rain.

How far ahead can I check the forecast for San Antonio?

This page shows a detailed 14-day forecast plus the long-term monthly climate, so you can plan both a short trip and a holiday months ahead.