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

Heat Builds in the West; Extremely Critical Fire Weather in the Northwest

A heat wave over the Southwest will intensify this week, peaking and expanding into the Intermountain West and northern High Plains this weekend. Critical to extremely critical fire weather conditions are forecast from the Northwest and the northern Great Basin this weekend. Particularly Dangerous Situation Red Flag Warnings have been issued. Read More >

Hazardous Weather Conditions

Current conditions at

Janesville-Rock County (KJVL)

Lat: 42.62°NLon: 89.04°WElev: 801ft.

Fair

64°F

18°C

Humidity 94%
Wind Speed N 5 mph
Barometer 29.87 in
Dewpoint 63°F (17°C)
Visibility 10.00 mi
Last update 1 Aug 10:35 pm CDT
Extended Forecast for

Darien WI

  • Tonight

    Tonight: Mostly cloudy, with a low around 61. Northeast wind around 10 mph.

    Low: 61 °F

    Mostly Cloudy

  • Sunday

    Sunday: Patchy fog before 7am. Otherwise, cloudy, then gradually becoming mostly sunny, with a high near 77. North wind 10 to 15 mph.

    High: 77 °F

    Patchy Fog
    then Partly
    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 55. Northeast wind 5 to 10 mph becoming light north after midnight.

    Low: 55 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 79. Calm wind becoming east around 5 mph in the morning.

    High: 79 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 56. East wind around 5 mph becoming calm in the evening.

    Low: 56 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 82. Calm wind becoming southwest around 5 mph in the afternoon.

    High: 82 °F

    Sunny

  • Tuesday Night

    Tuesday Night: A 30 percent chance of showers after 1am. Partly cloudy, with a low around 62. Southwest wind around 5 mph becoming calm.

    Low: 62 °F

    Partly Cloudy
    then Chance
    Showers

  • Wednesday

    Wednesday: A chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 78. Calm wind becoming west around 5 mph in the afternoon. Chance of precipitation is 50%.

    High: 78 °F

    Chance
    Showers

  • Wednesday Night

    Wednesday Night: A slight chance of showers and thunderstorms. Mostly cloudy, with a low around 57. Chance of precipitation is 20%.

    Low: 57 °F

    Slight Chance
    T-storms

Detailed Forecast

Tonight
Mostly cloudy, with a low around 61. Northeast wind around 10 mph.
Sunday
Patchy fog before 7am. Otherwise, cloudy, then gradually becoming mostly sunny, with a high near 77. North wind 10 to 15 mph.
Sunday Night
Mostly clear, with a low around 55. Northeast wind 5 to 10 mph becoming light north after midnight.
Monday
Sunny, with a high near 79. Calm wind becoming east around 5 mph in the morning.
Monday Night
Mostly clear, with a low around 56. East wind around 5 mph becoming calm in the evening.
Tuesday
Sunny, with a high near 82. Calm wind becoming southwest around 5 mph in the afternoon.
Tuesday Night
A 30 percent chance of showers after 1am. Partly cloudy, with a low around 62. Southwest wind around 5 mph becoming calm.
Wednesday
A chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 78. Calm wind becoming west around 5 mph in the afternoon. Chance of precipitation is 50%.
Wednesday Night
A slight chance of showers and thunderstorms. Mostly cloudy, with a low around 57. Chance of precipitation is 20%.
Thursday
A chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 79. Chance of precipitation is 30%.
Thursday Night
A 20 percent chance of showers. Partly cloudy, with a low around 61.
Friday
A 20 percent chance of showers. Partly sunny, with a high near 82.
Friday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 64.
Saturday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 85.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Darien WI
 42.59°N 88.72°W (Elev. 945 ft)
Last Update:
9:57 pm CDT Aug 1, 2026
Forecast Valid:
10pm CDT Aug 1, 2026-6pm CDT Aug 8, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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