Janesville, IL weather
Today, hourly and 7-day forecast, sunrise and sunset, and the normal climate month by month
Weather in Janesville now
Loading the National Weather Service forecast…
Janesville weather by the hour
Janesville weather for the next 7 days
Source: National Weather Service (NOAA) · forecast for the coordinates of Janesville.
This week in Janesville
Sunrise, sunset and moon in Janesville
What is the weather usually like in Janesville?
Köppen climate classification, calculated from the 1991–2020 normals
- Julywarmest month · 86°F average high
- Januarycoldest month · 20°F average low
- 36.0 inprecipitation per year · 915 mm
Average high and low temperature (°F)
Average precipitation (inches)
Best time to visit Janesville: May–June and August–September, with mild temperatures and fewer rainy days.
Source: NOAA NCEI U.S. Climate Normals 1991–2020, station MATTOON COLES CO AP, IL US (USW00053802), adjusted for the elevation of Janesville.
Janesville weather month by month
Sunrise and sunset in Janesville through the year
| Month | Sunrise | Sunset | Daylight |
|---|---|---|---|
| January | 7:09 AM | 4:55 PM | 9 h 45 min |
| February | 6:43 AM | 5:31 PM | 10 h 48 min |
| March | 7:02 AM | 7:01 PM | 11 h 58 min |
| April | 6:13 AM | 7:31 PM | 13 h 18 min |
| May | 5:37 AM | 8:01 PM | 14 h 23 min |
| June | 5:24 AM | 8:23 PM | 14 h 59 min |
| July | 5:37 AM | 8:20 PM | 14 h 43 min |
| August | 6:04 AM | 7:50 PM | 13 h 45 min |
| September | 6:33 AM | 7:03 PM | 12 h 29 min |
| October | 7:01 AM | 6:15 PM | 11 h 13 min |
| November | 6:35 AM | 4:39 PM | 10 h 4 min |
| December | 7:04 AM | 4:32 PM | 9 h 27 min |
Times for the 15th of each month, local time (America/Chicago).
What is the weather like in Janesville?
Janesville has a hot-summer humid continental climate. The warmest month is July, with an average high of 86°F (30°C), and the coldest is January, with average lows of 20°F (-6°C).
It gets about 36.0 inches (915 mm) of precipitation a year. The wettest month is June and the driest is February.
The best time to visit Janesville is May–June and August–September. At 689 ft of elevation, nights are mild most of the year. The live forecast on this page comes from the National Weather Service and the climate averages from NOAA’s 1991–2020 U.S. Climate Normals.
More about Janesville
Weather in towns near Janesville
Questions about the weather in Janesville
What is the hottest month in Janesville?
July, with an average high of 86°F (30°C).
What is the coldest month in Janesville?
January, with an average low of 20°F (-6°C).
How much does it rain in Janesville?
About 36.0 inches (915 mm) a year; the wettest month is June.
Does it snow in Janesville?
Snow is very rare or not recorded at the nearest weather station.
When is the best time to visit Janesville?
May–June and August–September, when temperatures are most pleasant and rainy days are fewer.
What climate does Janesville have?
Hot-summer humid continental (Köppen Dfa).
What is the weather like in Janesville in November?
Highs average 51°F and lows 35°F, with about 3.0 inches of precipitation.
What time is sunrise in Janesville?
Around 6:35 AM in mid-November, and sunset around 4:39 PM. Today’s exact times are shown above.
Where does this Janesville weather forecast come from?
From the National Weather Service (NOAA), the official U.S. weather agency, for the exact coordinates of Janesville.
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