Contents
- Weather in May
- Frequently asked questions
- Average temperature in May
- Average pressure in May
- Average wind speed in May
- Average humidity in May
- Average rainfall in May
- Average rainfall days in May
- Average snowfall in May
- Average snowfall days in May
- Average daylight in May
- Average sunshine in May
- Average sunshine days in May
- Average UV index in May
- Average cloud cover in May
- Average visibility in May
Weather in May
Temperature
With the arrival of May, the average high-temperature transitions from a moderate 56.1°F (13.4°C) in April to an agreeable 68.2°F (20.1°C). In May, the temperature drops to an average of 51.4°F (10.8°C) at night.Humidity
In May, the average relative humidity in Saint Charles is 78%.Rainfall
The month with the most rainfall in Saint Charles is May, when the rain falls for 12.4 days and typically aggregates up to 1.26" (32mm) of precipitation.Snowfall
In Saint Charles, snow does not fall in May through September.Daylight
In Saint Charles, the average length of the day in May is 14h and 35min.On the first day of the month, sunrise is at 5:48 am and sunset at 7:52 pm. On the last day of May, sunrise is at 5:20 am and sunset at 8:21 pm CDT.
Sunshine
In May, the average sunshine in Saint Charles is 8.5h.UV index
In May, the average daily maximum UV index in Saint Charles is 5. A UV Index of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV radiation for average individuals.Note: The maximum UV index of 5 during May leads to these instructions:
Be mindful. Those with pale skin might receive burns in fewer than 30 minutes. Considering the Sun's intensity during midday, it's wise to minimize direct exposure. Safeguard your eyes, ears, and face from sun rays with the aid of a wide-brim hat. Keep in mind! Snow's reflective quality can nearly double the intensity of the Sun's UV radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are May temperatures in Saint Charles?
What is the average humidity in May in Saint Charles?
What is the wettest month in Saint Charles?
How much does it rain in Saint Charles in May?
When it does not snow in Saint Charles?
Does it snow in Saint Charles in May?
How many hours of daylight does Saint Charles have in May?
When are sunrise and sunset in May in Saint Charles?
How many hours of sunshine does Saint Charles have in May?
What is the UV index reading in May in Saint Charles?
Average temperature in May
Saint Charles, IL
- Average high temperature in May: 68.2°F
The warmest month (with the highest average high temperature) is July (81°F).
The month with the lowest average high temperature is January (27.9°F).
- Average low temperature in May: 51.4°F
The month with the highest average low temperature is July (64.2°F).
The coldest month (with the lowest average low temperature) is January (16.2°F).
Average pressure in May
Saint Charles, IL
- Average pressure in May: 29.96"Hg
The month with the highest atmospheric pressure is January (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in May
Saint Charles, IL
- Average wind speed in May: 8.2mph
The windiest month (with the highest average wind speed) is January (9.9mph).
The calmest month (with the lowest average wind speed) is August (6.1mph).
Average humidity in May
Saint Charles, IL
- Average humidity in May: 78%
The months with the highest relative humidity are January and February (83%).
The month with the lowest relative humidity is October (74%).
Average rainfall in May
Saint Charles, IL
- Average rainfall in May: 1.26"
The wettest month (with the highest rainfall) is May (1.26").
The driest months (with the least rainfall) are November and December (0.39").
Average rainfall days in May
Saint Charles, IL
- Average rainfall days in May: 12.4 days
The month with the highest number of rainy days is May (12.4 days).
The month with the least rainy days is January (3.4 days).
Average snowfall in May
Saint Charles, IL
- Average snowfall in May: 0"
The month with the highest snowfall is January (1.14").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in May
Saint Charles, IL
- Average snowfall days in May: 0.1 days
The month with the highest number of snowfall days is January (7.6 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in May /
Average sunshine in May
Saint Charles, IL
- Average daylight in May: 14h and 4min
The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in May: 8h and 3min
The month with the most sunshine is July (Average sunshine: 9h and 54min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).
Average sunshine days in May
Saint Charles, IL
- Average sunshine days in May: 14.9 days
The month with the most sunshine days is December (22.4 days).
The month with the least sunshine days is June (13.3 days).
Average UV index in May
Saint Charles, IL
- Average UV index in May: 5
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in May
Saint Charles, IL
- Average cloud cover in May: 43
The month with the most cloud cover is January (Cloud cover 62).
The month with the least cloud cover is September (Cloud cover 32).
Average visibility in May
Saint Charles, IL
- Average visibility in May: 6mi
The months with the highest visibility are January, February, March, April, May, June, August, September, October, November and December (6mi).
The month with the lowest visibility is July (5mi).
Saint Charles, Illinois, USA
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