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

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

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

thunder

72°F

22°C

Humidity 51%
Wind Speed ENE 9 MPH
Barometer 30.2 in (1022.69 mb)
Dewpoint 53°F (12°C)
Visibility 10.00 mi
Last update 18 Sep 04:54 PM MST
Extended Forecast for

St. Johns AZ

  • Tonight

    Tonight: A 10 percent chance of showers and thunderstorms before midnight. Mostly clear, with a low around 54. South wind 5 to 10 mph, with gusts as high as 15 mph.

    Low: 54 °F

    Slight Chance
    T-storms then
    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 81. Light and variable wind becoming west 11 to 16 mph in the morning. Winds could gust as high as 24 mph.

    High: 81 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 49. West wind 5 to 14 mph becoming south after midnight. Winds could gust as high as 21 mph.

    Low: 49 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 79. South wind 5 to 13 mph becoming northwest in the afternoon. Winds could gust as high as 20 mph.

    High: 79 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 52. Northwest wind 5 to 10 mph becoming south after midnight. Winds could gust as high as 15 mph.

    Low: 52 °F

    Mostly Cloudy

  • Monday

    Monday: Partly sunny, with a high near 79. Southeast wind 5 to 8 mph becoming northwest in the afternoon.

    High: 79 °F

    Partly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 54. West wind 5 to 7 mph becoming southeast after midnight.

    Low: 54 °F

    Partly Cloudy

  • Tuesday

    Tuesday: A slight chance of showers, then showers likely and possibly a thunderstorm after noon. Partly sunny, with a high near 77. South wind 8 to 14 mph, with gusts as high as 22 mph. Chance of precipitation is 70%.

    High: 77 °F

    Slight Chance
    Showers then
    Showers
    Likely

  • Tuesday Night

    Tuesday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 55. Southeast wind 9 to 17 mph, with gusts as high as 25 mph. Chance of precipitation is 50%.

    Low: 55 °F

    Chance
    T-storms then
    Chance
    Showers

Detailed Forecast

Tonight
A 10 percent chance of showers and thunderstorms before midnight. Mostly clear, with a low around 54. South wind 5 to 10 mph, with gusts as high as 15 mph.
Saturday
Sunny, with a high near 81. Light and variable wind becoming west 11 to 16 mph in the morning. Winds could gust as high as 24 mph.
Saturday Night
Mostly clear, with a low around 49. West wind 5 to 14 mph becoming south after midnight. Winds could gust as high as 21 mph.
Sunday
Sunny, with a high near 79. South wind 5 to 13 mph becoming northwest in the afternoon. Winds could gust as high as 20 mph.
Sunday Night
Mostly cloudy, with a low around 52. Northwest wind 5 to 10 mph becoming south after midnight. Winds could gust as high as 15 mph.
Monday
Partly sunny, with a high near 79. Southeast wind 5 to 8 mph becoming northwest in the afternoon.
Monday Night
Partly cloudy, with a low around 54. West wind 5 to 7 mph becoming southeast after midnight.
Tuesday
A slight chance of showers, then showers likely and possibly a thunderstorm after noon. Partly sunny, with a high near 77. South wind 8 to 14 mph, with gusts as high as 22 mph. Chance of precipitation is 70%.
Tuesday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 55. Southeast wind 9 to 17 mph, with gusts as high as 25 mph. Chance of precipitation is 50%.
Wednesday
A chance of showers, with thunderstorms also possible after noon. Mostly cloudy, with a high near 75. Southeast wind 5 to 14 mph, with gusts as high as 20 mph. Chance of precipitation is 50%.
Wednesday Night
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 54. Southeast wind 6 to 9 mph, with gusts as high as 17 mph.
Thursday
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 75. East wind around 8 mph, with gusts as high as 15 mph.
Thursday Night
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 55. Southeast wind 7 to 9 mph, with gusts as high as 18 mph.
Friday
A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 76. Southeast wind 8 to 16 mph, with gusts as high as 24 mph.
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Forecast Area
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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 pm MDT Sep 18, 2026
Forecast Valid:
6pm MDT Sep 18, 2026-6pm MDT Sep 25, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

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