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4°
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3°
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September is one of the best months to visit Illinois for the best beach weather. It has the most sunshine and best sunbathing and swimming conditions of the year.
The weather in September is cooler than the previous month and temperatures continue to drop markedly into October. September has average maximum temperatures of 24°C (76°F) which is nice and warm and makes sunbathing pleasant on clear days. The sunshine percentage is 68% making it sunny but overcast at times. The hours of sunshine per day are 8.5hrs making the days long and bright.
September has total rainfall of 6.6cm (2.6inches) making it mostly dry with only intermittent light showers. There are only 10.2 days with some rainfall so you can still enjoy the beach on the majority of days.
Sea temperatures are a cold 16°C (61°F). September is too cold for swimming in Illinois for any length of time, unless you have a wetsuit. The sea temperature in September is cooler than the previous month and temperatures continue to drop into October.
Also consider visiting Illinois in one of the other best months of June, July, August, for the best beach weather. Also consider one of our other suggestions for September.
Yes, September is a good time for sunbathing in Illinois.
September has average maximum temperatures of 24°C (76°F) which is nice and warm and makes sunbathing pleasant on clear days. The sunshine percentage is 68% making it sunny but overcast at times. The hours of sunshine per day are 8.5hrs making the days long and bright. September has total rainfall of 6.6cm (2.6inches) making it mostly dry with only intermittent light showers. There are only 10.2 days with some rainfall so you can still enjoy the beach on the majority of days.
More about September temperature and sunshine.
No, September is too cold for swimming in Illinois for any length of time, with the sea water at 16°C (61°F), unless you have a wetsuit.
More about September sea temperatures.
Yes, September is a good time for a holiday in Illinois.
September has average maximum temperatures of 24°C (76°F) which is nice and warm and makes sunbathing pleasant on clear days. The sunshine percentage is 68% making it sunny but overcast at times. The hours of sunshine per day are 8.5hrs making the days long and bright. September has total rainfall of 6.6cm (2.6inches) making it mostly dry with only intermittent light showers. There are only 10.2 days with some rainfall so you can still enjoy the beach on the majority of days. Sea temperatures are a cold 16°C (61°F). September is too cold for swimming in Illinois for any length of time, unless you have a wetsuit.
More about the September temperatures and sunshine.
Yes, Illinois is nice and warm and makes sunbathing pleasant on clear days in September.
The average maximum temperature in Illinois in September is 24°C (76°F). The average maximum temperature is 28°C (82°) in the previous month and 17°C (63°F) in the next month.
The average temperature in Illinois in September is 20°C (67°F). The average temperature is 23°C (74°F) in the previous month and 13°C (55°F) in the next month.
More info about the September temperatures and sunshine.
The average day light hours per day in Illinois in September are 12.5. The sunshine percentage is 68% making it sunny but overcast at times. The hours of sunshine per day are 8.5hrs making the days long and bright.
More about September sunshine.
The weather in September is cooler than the previous month and temperatures continue to drop markedly into October. The average maximum temperature in Illinois in September is 24°C (76°F). The average maximum temperature is 28°C (82°F) in the previous month and 17°C (63°F) in the next month.
The average temperature in Illinois in September is 20°C (67°F). The average temperature is 23°C (74°F) in the previous month and 13°C (55°F) in the next month.
The average minimum temperature in Illinois in September is 15°C (59°F). The minimum temperature is 19°C (67°F) in the previous month and 8°C (47°F) in the next month.
The days in September are shorter than the previous month and days continue to get shorter into October. September has far fewer hours of sunshine than the previous month and hours of sunshine continue to drop quickly into October. During September the average day light hours are 12.5 per day in Illinois. The sunshine percentage is 68% making it sunny but overcast at times. The hours of sunshine per day are 8.5hrs making the days long and bright.
The ultraviolet index in Illinois in September is typically 6.5 during September. An ultraviolet index reading of 6 to 7 indicates a high risk of harm from unprotected sun exposure. Unprotected skin risks burning in less than 20 minutes. Protection against skin and eye damage is needed. Tanning will be safest before 10am and after 4pm. For those with sensitive skin stay in the shade and wear protective clothing, a wide-brimmed hat, and UV-blocking sunglasses. Generously apply broad spectrum SPF 30+ sunscreen every 2 hours, even on cloudy days. Watch out for relections from water that may increase ultraviolet exposure.
The average sea water temperature in Illinois in September is 16°C (60.8°F) which is cool for swimming, shorty wetsuit may help you extend your time in the water. The sea temperature in September is cooler than the previous month and temperatures continue to drop into October.
September weather is slightly drier than the previous month. September has fewer days of rain than the previous month. The average total rainfall in Illinois in September is 6.6cm (2.6inches) and on average there are 10.2 rainy days in September making it a pretty wet time to visit the beach.
The maximum dew point (an indicator of humidity) in Illinois in September is 15°C (59°F) which is comfortable for everyone. The dew point is 19°C (65°F) in the previous month and 9°C (9°F) in the next month.
The average maximum relative humidity in Illinois in September is typically 84.1%. The maximum relative humidity is 84% in the previous month and 83.4% in the next month.
The average relative humidity in Illinois in September is typically 64.8%. The average relative humidity is 65.2% in the previous month and 65.2% in the next month.
The average maximum wind speed in Illinois in September is typically 25KM/H (16MPH). The average maximum wind speed is 26KM/H (16MPH) in the previous month and 28KM/H (17MPH) in the next month.
The average wind speed in Illinois in September is typically 13KM/H (8MPH). The average wind speed is 12KM/H (7MPH) in the previous month and 15KM/H (9MPH) in the next month.
The average wind direction in Illinois in September is from the South-Southwest.
Beaches recommended for you today, this weekend, in the next 2 weeks or in any month of the year.
Beaches recommended for you today, this weekend, in the next 2 weeks or in any month of the year.
