Dangerous Heat in the Central and Eastern U.S.; Severe Thunderstorms in the Central U.S. and Northeast; Critical Fire Weather in the Four Corners

Dangerous, record-breaking heat will intensify across most of the central and eastern U.S this week. Heat indices will likely exceed 100 degrees. Severe thunderstorms are forecast from parts of the central High Plains into the Upper Midwest, and across parts of the Northeast. Critical fire weather conditions will continue across portions of the Four Corners and Great Basin. Read More >

Hazardous Weather Conditions

Current conditions at

Janesville-Rock County (KJVL)

Lat: 42.62°NLon: 89.04°WElev: 801ft.

Mostly Cloudy and Breezy

91°F

33°C

Humidity	63%
Wind Speed	SW 21 G 26 mph
Barometer	29.87 in
Dewpoint	77°F (25°C)
Visibility	10.00 mi
Heat Index	104°F (40°C)
Last update	30 Jun 3:45 pm CDT

More Information:

Local Forecast Office More Local Wx 3 Day History Hourly Weather Forecast

Extended Forecast for

5 Miles SSW Janesville WI

Extreme Heat Warning June 30, 04:49pm until July 1, 07:00pm

Click here for hazard details and duration

Extreme Heat Warning

Extreme Heat Warning June 30, 04:49pm until July 1, 07:00pm
NOW until 7:00pm Wed
Extreme Heat Warning
Tonight
Low: 76 °F
Mostly Clear
Wednesday
High: 93 °F
Hot
Wednesday Night
Low: 76 °F
Mostly Clear
Thursday
High: 92 °F
Mostly Sunny
then Chance
T-storms
Thursday Night
Low: 72 °F
Chance
T-storms
Friday
High: 90 °F
Scattered
Showers then
Showers
Likely
Friday Night
Low: 70 °F
Chance
T-storms then
Showers
Likely
Independence Day
High: 84 °F
Chance
T-storms then
Showers
Likely

Detailed Forecast

Tonight

Mostly clear, with a low around 76. Southwest wind 5 to 15 mph, with gusts as high as 25 mph.

Wednesday

Sunny and hot, with a high near 93. Heat index values as high as 100. Southwest wind 10 to 15 mph.

Wednesday Night

Mostly clear, with a low around 76. Southwest wind 10 to 15 mph.

Thursday

A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny and hot, with a high near 92. Heat index values as high as 99. Southwest wind 10 to 15 mph.

Thursday Night

A chance of showers and thunderstorms. Partly cloudy, with a low around 72. South wind 5 to 10 mph. Chance of precipitation is 40%.

Friday

Scattered showers before 7am, then scattered showers and thunderstorms between 7am and 1pm, then showers likely and possibly a thunderstorm after 1pm. Mostly sunny and hot, with a high near 90. Southwest wind 5 to 10 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Friday Night

A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 70. Southwest wind 5 to 10 mph becoming light and variable in the evening. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Independence Day

A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Partly sunny, with a high near 84. East wind 5 to 10 mph becoming north in the morning. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Saturday Night

Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 66. Chance of precipitation is 60%.

Sunday

A chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 83. Chance of precipitation is 40%.

Sunday Night

A 30 percent chance of showers. Partly cloudy, with a low around 65.

Monday

A 20 percent chance of showers. Mostly sunny, with a high near 83.

Monday Night

Partly cloudy, with a low around 64.

Tuesday

Mostly sunny, with a high near 84.