Janesville 7-day weather forecast

Written by:
March 23, 2026
ESOlex // Shutterstock

Janesville 7-day weather forecast

Stacker created the forecast for Janesville, Wisconsin using data from OpenWeather. This week's high is 79 °F on Monday, while the low is 40 °F on Thursday. There is expected to be 1 sunny day and rain on 5 days this week.

There are currently no weather alerts.

Monday, May 18

- High of 79 °F, low of 67 °F (78% humidity)
- Overcast with a 100% chance of rain (9 mm of rain)
- High risk of harm from sun exposure (6 UV index)
- Fresh breeze (19 mph wind)
- Sunrise at 5:30 AM, sunset at 8:14 PM
1 / 6
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Tuesday, May 19

- High of 70 °F, low of 48 °F (91% humidity)
- Mostly cloudy with a 100% chance of rain (8 mm of rain)
- Moderate risk of harm from sun exposure (3 UV index)
- Fresh breeze (21 mph wind)
- Sunrise at 5:29 AM, sunset at 8:15 PM
2 / 6
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Wednesday, May 20

- High of 59 °F, low of 41 °F (57% humidity)
- Mostly sunny with a 0% chance of rain
- Very high risk of harm from sun exposure (8 UV index)
- Gentle breeze (12 mph wind)
- Sunrise at 5:29 AM, sunset at 8:16 PM
3 / 6
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Thursday, May 21

- High of 62 °F, low of 40 °F (58% humidity)
- Partly cloudy with a 0% chance of rain
- Very high risk of harm from sun exposure (8 UV index)
- Moderate breeze (13 mph wind)
- Sunrise at 5:28 AM, sunset at 8:17 PM
4 / 6
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Friday, May 22

- High of 54 °F, low of 47 °F (70% humidity)
- Overcast with a 100% chance of rain (4 mm of rain)
- Moderate breeze (14 mph wind)
- Sunrise at 5:27 AM, sunset at 8:18 PM
5 / 6
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Saturday, May 23

- High of 63 °F, low of 50 °F (91% humidity)
- Overcast with a 100% chance of rain (7 mm of rain)
- Moderate breeze (14 mph wind)
- Sunrise at 5:26 AM, sunset at 8:19 PM
- First quarter moon
6 / 6
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Sunday, May 24

- High of 79 °F, low of 59 °F (66% humidity)
- Mostly cloudy with a 30% chance of rain (1 mm of rain)
- Gentle breeze (10 mph wind)
- Sunrise at 5:25 AM, sunset at 8:20 PM

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