Janesville Weather in September

September in Janesville typically sees daytime highs of 24°C (75°F) and nighttime lows of 11°C (52°F). Rainfall is also possible this month, so it's worth packing an umbrella.

Rainfall in Janesville in September

On average, there are about 9 days with rain during this month, averaging 79 mm (3.1 in). The rain this month tends to fall in heavier spells rather than light drizzle. When it rains, showers can be significant.

Temperature in Janesville in September

The temperature in Janesville in September is perfect. Daytime highs reach 24°C (75°F), with nights dropping to 11°C (52°F). This gives the month a fairly typical daily rhythm, with warmer afternoons and more comfortable nights. At 11°C (52°F) overnight, it can feel quite a bit cooler after dark. Worth packing something warmer for evenings, but the cooler temperatures are ideal for sleeping.

Sunshine in Janesville in September

The city usually sees around 212 hours of sunlight, indicating many sunny days — a great month for sightseeing.

If you're inclined towards comfortable temperatures and drier conditions, September is a good time to visit Janesville.

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• January
• February
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• October
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For a detailed overview over the year and the best time to visit the United States of America, check out our Janesville's climate page.

Janesville Temperature in September

Min Temperature 11°C (52°F)  

Max Temperature 24°C (75°F)  

Chance of Rain 31%  

Precipitation 79 mm (3.1 in)  

Rainy days 9 days  

Humidity 76% *  

Sunshine 212 hours *  

Percentage Sunshine 57% *  

* Data from: Madison, the United States of America (51 KM, 31 Miles).

What to Wear in Janesville in September

Pleasant temperatures in September mean you can pack light but flexibel pieces. Think cotton t-shirts, comfortable walking shorts, and one warmer layer for evenings. A light sweater or denim jacket works well. Rain gear is recommended, you can expect wet weather on multiple days. Don't forget sun protection, sunglasses, sunscreen, and a hat. These are all good ideas with this much sunshine.

What To Do in Janesville in September

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Swimming

9/10

Cycling

9/10

Walking

9/10

Barbeque

8/10

Camping

8/10

Outdoor sports

9/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit the United States of America, check out our Janesville's climate page.

More climate data for Janesville

Temperature Rainfall Sunshine Humidity

See the full Janesville climate overview or explore weather in the United States of America.