May weather forecastSouth Wilmington, IL
May
Weather in May
The last month of the spring, May, is a pleasant month in South Wilmington, Illinois, with an average temperature ranging between max 70.9°F (21.6°C) and min 54.1°F (12.3°C).Temperature
May's onset is marked by a temperature increase, moving from a mild 58.8°F (14.9°C) in April to a pleasant 70.9°F (21.6°C). South Wilmington reports an average nighttime low-temperature of 54.1°F (12.3°C) in May.Humidity
In South Wilmington, the average relative humidity in May is 76%.Rainfall
The month with the most rainfall in South Wilmington is May, when the rain falls for 17.1 days and typically aggregates up to 2.91" (74mm) of precipitation.Snowfall
May through September are months without snowfall in South Wilmington.Daylight
In May, the average length of the day in South Wilmington, Illinois, is 14h and 31min.On the first day of the month, sunrise is at 5:49 am and sunset at 7:50 pm. On the last day of May, sunrise is at 5:22 am and sunset at 8:19 pm CDT.
Sunshine
In South Wilmington, Illinois, the average sunshine in May is 8.9h.UV index
In May, the average daily maximum UV index is 5. A UV Index value of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV rays for the ordinary person.Note: The daily high UV index of 5 during May translates into the following recommendations:
Exercise care. People with light skin might get burns in fewer than 30 minutes. The intensity of the Sun's UV radiation during midday suggests reducing time spent outdoors. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in May
South Wilmington, IL
- Average high temperature in May: 70.9°F
The warmest month (with the highest average high temperature) is July (81.1°F).
The month with the lowest average high temperature is January (29.8°F).
- Average low temperature in May: 54.1°F
The month with the highest average low temperature is July (64.4°F).
The coldest month (with the lowest average low temperature) is January (18°F).
Average pressure in May
South Wilmington, IL
- Average pressure in May: 29.96"Hg
The month with the highest atmospheric pressure is January (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in May
South Wilmington, IL
- Average wind speed in May: 8.6mph
The windiest months (with the highest average wind speed) are January and April (10.1mph).
The calmest month (with the lowest average wind speed) is August (6mph).
Average humidity in May
South Wilmington, IL
- Average humidity in May: 76%
The month with the highest relative humidity is July (84%).
The month with the lowest relative humidity is October (72%).
Average rainfall in May
South Wilmington, IL
- Average rainfall in May: 2.91"
The wettest month (with the highest rainfall) is May (2.91").
The driest month (with the least rainfall) is February (0.98").
Average rainfall days in May
South Wilmington, IL
- Average rainfall days in May: 17.1 days
The month with the highest number of rainy days is July (17.3 days).
The month with the least rainy days is February (5.1 days).
Average snowfall in May
South Wilmington, IL
- Average snowfall in May: 0"
The month with the highest snowfall is February (2.52").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in May
South Wilmington, IL
- Average snowfall days in May: 0 days
The month with the highest number of snowfall days is January (11.5 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in May /
Average sunshine in May
South Wilmington, IL
- Average daylight in May: 14h and 30min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in May: 8h and 54min
The month with the most sunshine is June (Average sunshine: 9h and 54min).
The month with the least sunshine is January (Average sunshine: 3h and 54min).
Average sunshine days in May
South Wilmington, IL
- Average sunshine days in May: 11 days
The month with the most sunshine days is November (19.3 days).
The month with the least sunshine days is July (9.5 days).
Average UV index in May
South Wilmington, IL
- Average UV index in May: 5
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in May
South Wilmington, IL
- Average cloud cover in May: 41
The month with the most cloud cover is January (Cloud cover 59).
The months with the least cloud cover are August and September (Cloud cover 33).
Average visibility in May
South Wilmington, IL
- Average visibility in May: 6mi
The months with the highest visibility are January, February, March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are July and August (5mi).
