Weather in Illinois, United States in August

So you're interested in going to Illinois, United States in August

August is a hot and very rainy time for sunbathing in Illinois. August is an excellent month for swimming in Illinois with very warm sea temperatures. Consider visiting Illinois in the months of June, July, August, September, for the best beach weather. Also consider one of our other suggestions for August.

Temperature in Illinois in August

The average maximum temperature in Illinois in August is 28°. The average maximum temperature is 29° in the previous month and 24° in the next month.

The average temperature in Illinois in August is 23°. The average temperature ranges is 24° in the previous month and 20° in the next month.

The average minimum temperature in Illinois in August is 19°. The minimum temperature is 20° in the previous month and 15° in the next month.

Sunshine in Illinois in August

The average day light hours per day in Illinois in August are 13.9 and there are 10 hours of sunshine per day on average during August making it a sunny month with few clouds.

The ultraviolet index in Illinois in August is typically 8.7 during August. An ultraviolet index reading of 8 to 10 indicates a very high risk of harm from unprotected sun exposure. Unprotected skin risks burning in less than 15 minutes. Take extra precautions because unprotected skin and eyes will be damaged and can burn quickly. Tanning will be safest before 10am and after 4pm but only with a good application of sun screen. 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.

Sea Temperature in Illinois in August

The average sea water temperature in Illinois in August is 28.2° which is very warm and ideal for relaxing and swimming for the whole day.

Rainfall in Illinois in August

The average total rainfall in Illinois in August is 114.5cm and on average there are 11 rainy days in August making it a very wet time to visit the beach.

Humidity in Illinois in August

The maximum dew point (an indicator of humidity) in Illinois in August is 19° which is somewhat uncomfortable for most people in cities but fine on a beach. The dew point is 19° in the previous month and 15° in the next month.

The average maximum relative humidity in Illinois in August is typically 84%. The maximum relative humidity is 82.3% in the previous month and 84.1% in the next month.

The average relative humidity in Illinois in August is typically 65.2%. The average relative humidity is 62.2% in the previous month and 64.8% in the next month.

Wind Speed in Illinois in August

The average maximum wind speed in Illinois in August is typically 26kmh. The average maximum wind speed is 28kmh in the previous month and 25kmh in the next month.

The average wind speed in Illinois in August is typically 12kmh. The average wind speed is 13kmh in the previous month and 13kmh in the next month.

The average wind direction in Illinois in August is from the South-Southwest.

Monthly Averages

Suggested Beaches in August

Book Accomodation Deals