Tomorrow Hourly Weather Forecast for Janesville, WI

Hourly Weather | Tomorrow › Tuesday, June 30, 2026

Active Weather Warnings

Extreme Heat Watch
Extreme Heat Warning

Janesville, Wisconsin

12 AM

81°

Feels Like 86°

Humidity: 80%

UV Index: 0

Wind: 7 mph

1 AM

79°

Feels Like 84°

Humidity: 81%

UV Index: 0

Wind: 7 mph

2 AM

79°

Feels Like 82°

Humidity: 81%

UV Index: 0

Wind: 6 mph

3 AM

77°

Feels Like 81°

Humidity: 84%

UV Index: 0

Wind: 6 mph

4 AM

75°

Feels Like 81°

Humidity: 86%

UV Index: 0

Wind: 6 mph

5 AM

73°

Feels Like 77°

Humidity: 93%

UV Index: 0

Wind: 5 mph

6 AM

75°

Feels Like 81°

Humidity: 87%

UV Index: 0

Wind: 6 mph

7 AM

77°

Feels Like 82°

Humidity: 83%

UV Index: 1

Wind: 7 mph

8 AM

79°

Feels Like 86°

Humidity: 76%

UV Index: 2

Wind: 8 mph

9 AM

82°

Feels Like 90°

Humidity: 71%

UV Index: 3

Wind: 9 mph

10 AM

84°

Feels Like 93°

Humidity: 65%

UV Index: 5

Wind: 10 mph

11 AM

88°

Feels Like 99°

Humidity: 59%

UV Index: 7

Wind: 10 mph

12 PM

90°

Feels Like 100°

Humidity: 55%

UV Index: 9

Wind: 12 mph

1 PM

91°

Feels Like 102°

Humidity: 51%

UV Index: 10

Wind: 13 mph

2 PM

93°

Feels Like 102°

Humidity: 49%

UV Index: 9

Wind: 15 mph

3 PM

95°

Feels Like 102°

Humidity: 46%

UV Index: 7

Wind: 15 mph

4 PM

93°

Feels Like 99°

Humidity: 48%

UV Index: 5

Wind: 16 mph

5 PM

93°

Feels Like 97°

Humidity: 50%

UV Index: 3

Wind: 16 mph

6 PM

91°

Feels Like 95°

Humidity: 53%

UV Index: 2

Wind: 16 mph

7 PM

90°

Feels Like 93°

Humidity: 57%

UV Index: 1

Wind: 15 mph

8 PM

88°

Feels Like 90°

Humidity: 61%

UV Index: 0

Wind: 13 mph

9 PM

84°

Feels Like 88°

Humidity: 68%

UV Index: 0

Wind: 10 mph

10 PM

81°

Feels Like 86°

Humidity: 74%

UV Index: 0

Wind: 8 mph

11 PM

81°

Feels Like 84°

Humidity: 76%

UV Index: 0

Wind: 8 mph

Weather Alerts and Warnings for Janesville

Severe Future Likely

Extreme Heat Watch

Extreme Heat Watch issued June 28 at 6:24AM CDT until June 30 at 8:00AM CDT by NWS Milwaukee/Sullivan WI

Jun 29, 12:00 PM → Jun 30, 8:00 AM

WHAT: Dangerously hot conditions with heat index values up to 105
degrees possible throughout the day Monday, with high humidity and
continued heat index values above 75 degrees throughout the
overnight hours into Tuesday morning.

WHERE: Portions of east central, south central, and southeast
Wisconsin.

WHEN: From Monday afternoon through Tuesday morning.

IMPACTS: Heat related illnesses increase significantly during
extreme heat and high humidity events.

+ Read More

Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Do not leave young children and pets in unattended vehicles. Car interiors will reach lethal temperatures in a matter of minutes.

Updated: Jun 28, 10:37 AM Source: NWS Alert

Severe Expected Likely

Extreme Heat Warning

Extreme Heat Warning issued June 29 at 7:32PM CDT until July 1 at 7:00PM CDT by NWS Milwaukee/Sullivan WI

Jun 29, 7:32 PM → Jul 1, 7:00 PM

WHAT: Dangerously hot conditions with heat index values up to 106.

WHERE: Portions of east central, south central, and southeast
Wisconsin.

WHEN: Until 7 PM CDT Wednesday.

IMPACTS: Heat related illnesses increase significantly during
extreme heat and high humidity events.

+ Read More

Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to early morning or evening. Take action when you see symptoms of heat exhaustion and heat stroke. Stay cool, stay hydrated, stay informed.

Updated: Jun 29, 11:09 PM Source: NWS Alert

Weather Alerts and Warnings for Janesville

Extreme Heat Watch

Extreme Heat Warning

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