National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Dangerous Heat and Heavy Rainfall into the Weekend

Hot temperatures and high humidity are forecast to continue across the mid-Mississippi Valley into this weekend. Heat Advisories remain in effect. Heavy to excessive rainfall occurring at times through the weekend could bring areas of flooding to parts of the northern Rockies, upper Midwest, central Great Lakes, and southern New England. Read More >

Current conditions at

San Angelo, Mathis Field (KSJT)

Lat: 31.35°NLon: 100.49°WElev: 1916ft.

A Few Clouds

90°F

32°C

Humidity 50%
Wind Speed S 8 mph
Barometer 30.01 in (1013.5 mb)
Dewpoint 69°F (21°C)
Visibility 10.00 mi
Heat Index95°F (35°C)
Last update 19 Sep 12:51 pm CDT
Extended Forecast for

Mertzon TX

  • This Afternoon

    This Afternoon: Mostly sunny, with a high near 96. South wind around 10 mph.

    High: 96 °F

    Mostly Sunny

  • Tonight

    Tonight: A 20 percent chance of showers and thunderstorms before 10pm. Partly cloudy, with a low around 71. South wind 5 to 10 mph.

    Low: 71 °F

    Slight Chance
    T-storms then
    Partly Cloudy

  • Sunday

    Sunday: A slight chance of showers between 1pm and 4pm, then a chance of showers and thunderstorms after 4pm. Mostly sunny, with a high near 96. South southwest wind 5 to 10 mph. Chance of precipitation is 30%.

    High: 96 °F

    Mostly Sunny
    then Chance
    Showers

  • Sunday Night

    Sunday Night: A chance of showers and thunderstorms before 1am, then a slight chance of showers. Partly cloudy, with a low around 68. South wind around 5 mph. Chance of precipitation is 40%.

    Low: 68 °F

    Chance
    Showers

  • Monday

    Monday: A chance of showers between 1pm and 4pm, then a chance of showers and thunderstorms after 4pm. Sunny, with a high near 94. Calm wind becoming east around 5 mph in the afternoon. Chance of precipitation is 30%.

    High: 94 °F

    Sunny then
    Chance
    Showers

  • Monday Night

    Monday Night: A chance of showers and thunderstorms before 10pm, then a chance of showers between 10pm and 1am, then a chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 66. East wind 5 to 10 mph becoming light after midnight. Chance of precipitation is 40%.

    Low: 66 °F

    Chance
    T-storms then
    Chance
    Showers

  • Tuesday

    Tuesday: A slight chance of showers, then a chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 89. East wind 5 to 10 mph. Chance of precipitation is 50%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 89 °F

    Slight Chance
    Showers then
    Chance
    T-storms

  • Tuesday Night

    Tuesday Night: A 30 percent chance of showers and thunderstorms, mainly after 1am. Mostly cloudy, with a low around 64. East wind 5 to 10 mph, with gusts as high as 20 mph.

    Low: 64 °F

    Slight Chance
    T-storms then
    Chance
    Showers

  • Wednesday

    Wednesday: Mostly sunny, with a high near 90. East southeast wind 5 to 10 mph.

    High: 90 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
Mostly sunny, with a high near 96. South wind around 10 mph.
Tonight
A 20 percent chance of showers and thunderstorms before 10pm. Partly cloudy, with a low around 71. South wind 5 to 10 mph.
Sunday
A slight chance of showers between 1pm and 4pm, then a chance of showers and thunderstorms after 4pm. Mostly sunny, with a high near 96. South southwest wind 5 to 10 mph. Chance of precipitation is 30%.
Sunday Night
A chance of showers and thunderstorms before 1am, then a slight chance of showers. Partly cloudy, with a low around 68. South wind around 5 mph. Chance of precipitation is 40%.
Monday
A chance of showers between 1pm and 4pm, then a chance of showers and thunderstorms after 4pm. Sunny, with a high near 94. Calm wind becoming east around 5 mph in the afternoon. Chance of precipitation is 30%.
Monday Night
A chance of showers and thunderstorms before 10pm, then a chance of showers between 10pm and 1am, then a chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 66. East wind 5 to 10 mph becoming light after midnight. Chance of precipitation is 40%.
Tuesday
A slight chance of showers, then a chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 89. East wind 5 to 10 mph. Chance of precipitation is 50%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Tuesday Night
A 30 percent chance of showers and thunderstorms, mainly after 1am. Mostly cloudy, with a low around 64. East wind 5 to 10 mph, with gusts as high as 20 mph.
Wednesday
Mostly sunny, with a high near 90. East southeast wind 5 to 10 mph.
Wednesday Night
Partly cloudy, with a low around 66. East wind 5 to 10 mph.
Thursday
Mostly sunny, with a high near 90.
Thursday Night
Mostly cloudy, with a low around 66.
Friday
Mostly sunny, with a high near 91.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Mertzon TX
 31.26°N 100.82°W (Elev. 2274 ft)
Last Update:
3:16 am CDT Sep 19, 2026
Forecast Valid:
1pm CDT Sep 19, 2026-6pm CDT Sep 25, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation