Crystal Lake weather in September (Illinois, United States of America)

Curious about the climate in Crystal Lake this September? Discover if this is the best time for your journey with our detailed monthly weather breakdown.

Temperatures

During September, Crystal Lake experiences perfect weather, with high temperatures and moderate rainfall. Expect daytime highs to reach approximately 23°C, with nighttime lows dipping to around 11°C.

Precipitation

Crystal Lake in September usually receives moderate rainfall, averaging around 78 mm for the month. When we look at the climate data from the last 30 years, you can expect around 10 days of rain.

Average sunshine

Expect a lot of sunshine this month, with about 226 hours of sunny weather. The abundant sunlight creates a lively and bright atmosphere.

If you're a fan of comfortable temperatures and drier conditions, September is a great time to visit. September generally stands out with the best circumstances. While January, February, March, November and December tend to showcase less optimal conditions.

For an in-depth look at the yearly conditions, visit our specialized Crystal Lake climate page with graphs.

 

Crystal Lake, monthly averages in September

Min Temperature 11°C  

Max Temperature 23°C  

Chance of Rain 33%  

Precipitation 78 mm  

Rainy days 10 days  

Humidity 71% *  

Sunshine 226 hours *  

Percentage Sunshine 60% *  

* Data from: Chicago, the United States of America (44 KM, 27 Miles).

Where to go in the United States of America in September

Find out more about the weather in the United States of America and which places have the best travel conditions in this month.

Weather conditions Weather

Temperatures

Precipitation

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Legend perfect weather pleasant tolerable unpleasant poor

Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C and 29°C and not too much precipitation (less than 90 mm a month).

So, what should you wear in this month?

For visitors traveling to Crystal Lake, we recommend wearing layers. So maybe a skirt, t-shirt, shorts for during the day and jeans and a warm jacket for some days and evenings. Bring a rain jacket in case it rains during your stay. Plan on layering your clothes.

What To Do

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

Interested in more climate information?

This site provides you with all the information you need about the climate in Crystal Lake.

Our site offers climate and forecast data for every country in the world. Are you going to the United States of America? On this website you can find historical weather averages for many cities in the United States of America. Not sure yet where to go? We now have a tool which recommends destinations that suit your ideal travel conditions. Find out where to go with our weather planner.