Joliet Weather in September

September in Joliet brings high temperatures, with highs of 25°C (77°F) and nights dropping to 13°C (55°F). Rainfall is on the higher side this month, averaging around 94 mm (3.7 in), so keep a rain jacket handy.

Rainfall in Joliet in September

You can expect rain on roughly 10 days based on historical data, averaging 94 mm (3.7 in) for the month. When it rains this month, it tends to come down fairly heavily. Showers can be substantial even if they don't last all day.

Temperature in Joliet in September

September in Joliet is generally perfect, with days reaching 25°C (77°F) and nights settling around 13°C (55°F). Conditions stay fairly consistent through the month, making it easier to plan what to wear. At 13°C (55°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 Joliet in September

The days are predominantly sunny, with an estimated total of around 226 hours of sunshine. These sun-filled days are perfect for playing sports, visiting parks, or going for a bike ride.

If you favor pleasant temperatures and minimal rainfall, September is one of the best months to visit Joliet.

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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 Joliet's climate page.

Joliet Temperature in September

Min Temperature 13°C (55°F)  

Max Temperature 25°C (77°F)  

Chance of Rain 32%  

Precipitation 94 mm (3.7 in)  

Rainy days 10 days  

Humidity 71% *  

Sunshine 226 hours *  

Percentage Sunshine 60% *  

* Data from: Chicago, the United States of America (53 KM, 33 Miles).

What to Wear in Joliet in September

For Joliet in September, you'll want flexible clothing. It's wise to pack cotton shirts, comfortable shorts, and a pair of jeans for cooler evenings. A light sweater or jacket is useful for air-conditioned spaces (like buses) or unexpected cool moments. High rain levels are expected, so pack waterproof gear and an umbrella or poncho. And with plenty of sunshine hours, don’t forget sunglasses, sunscreen, and maybe a sun hat.

What To Do in Joliet 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 Joliet's climate page.

More climate data for Joliet

Temperature Rainfall Sunshine Humidity

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