Weather in Illinois, United States in May

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

May is a warm and rainy time for sunbathing in Illinois. May is a good month for swimming in Illinois with 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 May.

Temperature in Illinois in May

The average maximum temperature in Illinois in May is 22°. The average maximum temperature is 16° in the previous month and 27° in the next month.

The average temperature in Illinois in May is 16°. The average temperature ranges is 11° in the previous month and 22° in the next month.

The average minimum temperature in Illinois in May is 11°. The minimum temperature is in the previous month and 17° in the next month.

Sunshine in Illinois in May

The average day light hours per day in Illinois in May are 14.5 and there are 9 hours of sunshine per day on average during May making it a sunny month with few clouds.

The ultraviolet index in Illinois in May is typically 8.8 during May. 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 May

The average sea water temperature in Illinois in May is 23.5° which is warm and pleasant for relaxing and swimming for long periods.

Rainfall in Illinois in May

The average total rainfall in Illinois in May is 98.2cm and on average there are 13.3 rainy days in May making it a wet time to visit the beach.

Humidity in Illinois in May

The maximum dew point (an indicator of humidity) in Illinois in May is 11° which is very comfortable. The dew point is in the previous month and 17° in the next month.

The average maximum relative humidity in Illinois in May is typically 81.4%. The maximum relative humidity is 79.4% in the previous month and 82.3% in the next month.

The average relative humidity in Illinois in May is typically 61.2%. The average relative humidity is 59.9% in the previous month and 62.3% in the next month.

Wind Speed in Illinois in May

The average maximum wind speed in Illinois in May is typically 30kmh. The average maximum wind speed is 33kmh in the previous month and 30kmh in the next month.

The average wind speed in Illinois in May is typically 15kmh. The average wind speed is 18kmh in the previous month and 14kmh in the next month.

The average wind direction in Illinois in May is from the East-Southeast.

Monthly Averages

Suggested Beaches in May

Book Accomodation Deals