Crystal Lake Weather in September

September in Crystal Lake sees daytime temperatures around 23°C (73°F) and lows of 11°C (52°F) at night. With around 78 mm (3.1 in) of rainfall expected, it's worth packing a rain jacket.

Rainfall in Crystal Lake in September

You can expect rain on around 10 days based on historical patterns, with 78 mm (3.1 in) average for the month. When showers do arrive, they tend to be on the heavier side. Worth being prepared even if rain days are not that numerous.

Temperature in Crystal Lake in September

September is one of the better months to visit Crystal Lake. Expect 23°C (73°F) during the day and 11°C (52°F) at night. This kind of day-to-night contrast is typical for this time of year. With overnight lows of 11°C (52°F), evenings can feel noticeably cooler than the daytime. An extra layer is a good idea, though the cool air makes for a good night's sleep.

Sunshine in Crystal Lake in September

With approximately 226 hours of sunshine, the days are filled with clear skies. It makes it a perfect month for being outside.

If you're a fan of comfortable temperatures and drier conditions, September is a great time to visit.

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• January
• February
• March
• April

• May
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• 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 Crystal Lake's climate page.

Crystal Lake Temperature in September

Min Temperature 11°C (52°F)  

Max Temperature 23°C (73°F)  

Chance of Rain 33%  

Precipitation 78 mm (3.1 in)  

Rainy days 10 days  

Humidity 71% *  

Sunshine 226 hours *  

Percentage Sunshine 60% *  

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

What to Wear in Crystal Lake in September

For Crystal Lake 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. Rain is likely on several days, so bring a good rain jacket. You'll definitely want to pack sunglasses and sunscreen. There will be plenty of bright sunshine this month.

What To Do in Crystal Lake 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 Crystal Lake's climate page.

More climate data for Crystal Lake

Temperature Rainfall Sunshine Humidity

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