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

Dangerous Heat and Possible Flooding

Dangerous heat will persist across the Southwest U.S. through Saturday with daytime highs of 110-115°F. Extreme Heat Warnings remain in effect. Dangerous heat will build across the southern Plains again beginning this weekend. Heavy to excessive rain over the Carolinas Friday may lead to isolated areas of flash flooding. Read More >

Current conditions at

St. Johns, St. Johns Industrial Airpark (KSJN)

Lat: 34.51833°NLon: 109.37917°WElev: 5732.0ft.

Clear

73°F

23°C

Humidity 33%
Wind Speed N 0 MPH
Barometer 30.3 in (1026.08 mb)
Dewpoint 43°F (6°C)
Visibility 10.00 mi
Last update 28 Aug 07:35 AM MST
Extended Forecast for

St. Johns AZ

  • Today

    Today: A 30 percent chance of showers and thunderstorms after noon. Mostly sunny, with a high near 95. Light and variable wind becoming southwest 9 to 14 mph in the afternoon. Winds could gust as high as 23 mph.

    High: 95 °F

    Mostly Sunny
    then Chance
    T-storms

  • Tonight

    Tonight: A chance of showers and thunderstorms. Mostly cloudy, with a low around 63. South wind 6 to 15 mph, with gusts as high as 24 mph. Chance of precipitation is 40%.

    Low: 63 °F

    Chance
    T-storms then
    Chance
    Showers

  • Saturday

    Saturday: A 50 percent chance of showers and thunderstorms after noon. Partly sunny, with a high near 91. Light and variable wind becoming southwest 6 to 11 mph in the afternoon. Winds could gust as high as 17 mph.

    High: 91 °F

    Partly Sunny
    then Chance
    T-storms

  • Saturday Night

    Saturday Night: Showers likely and possibly a thunderstorm before midnight, then a chance of showers and thunderstorms between midnight and 3am, then a chance of showers after 3am. Mostly cloudy, with a low around 61. Southwest wind 6 to 10 mph becoming southeast after midnight. Winds could gust as high as 16 mph. Chance of precipitation is 70%.

    Low: 61 °F

    Showers
    Likely

  • Sunday

    Sunday: A slight chance of showers before 9am, then a slight chance of showers and thunderstorms between 9am and noon, then showers and possibly a thunderstorm after noon. High near 86. Southeast wind 6 to 11 mph becoming west in the afternoon. Winds could gust as high as 18 mph. Chance of precipitation is 80%.

    High: 86 °F

    Slight Chance
    T-storms then
    T-storms

  • Sunday Night

    Sunday Night: Showers likely and possibly a thunderstorm before midnight, then a chance of showers and thunderstorms after midnight. Mostly cloudy, with a low around 58. South wind 6 to 11 mph, with gusts as high as 17 mph. Chance of precipitation is 70%.

    Low: 58 °F

    Showers
    Likely

  • Monday

    Monday: Showers and thunderstorms likely, mainly after noon. Partly sunny, with a high near 83. South wind 6 to 9 mph becoming west in the afternoon. Winds could gust as high as 15 mph. Chance of precipitation is 60%.

    High: 83 °F

    Chance
    Showers then
    T-storms
    Likely

  • Monday Night

    Monday Night: A chance of showers and thunderstorms before midnight, then a slight chance of showers. Partly cloudy, with a low around 56. West wind 5 to 9 mph becoming calm in the evening. Winds could gust as high as 16 mph. Chance of precipitation is 30%.

    Low: 56 °F

    Chance
    T-storms then
    Slight Chance
    Showers

  • Tuesday

    Tuesday: A 20 percent chance of showers and thunderstorms after noon. Mostly sunny, with a high near 85. Light and variable wind becoming west 5 to 10 mph in the afternoon. Winds could gust as high as 17 mph.

    High: 85 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

Detailed Forecast

Today
A 30 percent chance of showers and thunderstorms after noon. Mostly sunny, with a high near 95. Light and variable wind becoming southwest 9 to 14 mph in the afternoon. Winds could gust as high as 23 mph.
Tonight
A chance of showers and thunderstorms. Mostly cloudy, with a low around 63. South wind 6 to 15 mph, with gusts as high as 24 mph. Chance of precipitation is 40%.
Saturday
A 50 percent chance of showers and thunderstorms after noon. Partly sunny, with a high near 91. Light and variable wind becoming southwest 6 to 11 mph in the afternoon. Winds could gust as high as 17 mph.
Saturday Night
Showers likely and possibly a thunderstorm before midnight, then a chance of showers and thunderstorms between midnight and 3am, then a chance of showers after 3am. Mostly cloudy, with a low around 61. Southwest wind 6 to 10 mph becoming southeast after midnight. Winds could gust as high as 16 mph. Chance of precipitation is 70%.
Sunday
A slight chance of showers before 9am, then a slight chance of showers and thunderstorms between 9am and noon, then showers and possibly a thunderstorm after noon. High near 86. Southeast wind 6 to 11 mph becoming west in the afternoon. Winds could gust as high as 18 mph. Chance of precipitation is 80%.
Sunday Night
Showers likely and possibly a thunderstorm before midnight, then a chance of showers and thunderstorms after midnight. Mostly cloudy, with a low around 58. South wind 6 to 11 mph, with gusts as high as 17 mph. Chance of precipitation is 70%.
Monday
Showers and thunderstorms likely, mainly after noon. Partly sunny, with a high near 83. South wind 6 to 9 mph becoming west in the afternoon. Winds could gust as high as 15 mph. Chance of precipitation is 60%.
Monday Night
A chance of showers and thunderstorms before midnight, then a slight chance of showers. Partly cloudy, with a low around 56. West wind 5 to 9 mph becoming calm in the evening. Winds could gust as high as 16 mph. Chance of precipitation is 30%.
Tuesday
A 20 percent chance of showers and thunderstorms after noon. Mostly sunny, with a high near 85. Light and variable wind becoming west 5 to 10 mph in the afternoon. Winds could gust as high as 17 mph.
Tuesday Night
Partly cloudy, with a low around 57. West wind 5 to 10 mph becoming light and variable after midnight. Winds could gust as high as 17 mph.
Wednesday
A 10 percent chance of showers and thunderstorms. Sunny, with a high near 87. Calm wind becoming west 5 to 8 mph in the afternoon. Winds could gust as high as 17 mph.
Wednesday Night
Partly cloudy, with a low around 59. West wind 5 to 9 mph becoming calm after midnight. Winds could gust as high as 17 mph.
Thursday
Sunny, with a high near 89. Calm wind becoming west 5 to 9 mph in the afternoon. Winds could gust as high as 20 mph.
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ABOUT THIS FORECAST

 
Point Forecast:
St. Johns AZ
 34.51°N 109.37°W (Elev. 5797 ft)
Last Update:
4:13 am MDT Aug 28, 2026
Forecast Valid:
8am MDT Aug 28, 2026-6pm MDT Sep 3, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

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Chance of Precipitation