World Resorts USA Saint Charles Weather

Saint Charles weather in May

Weather in Saint Charles: May

Average day temperature: 71.9°F
Average night temperature: 59.3°F
Number of sunny days: 10 days
Day length: 13.9 - 14.7 hours
Number of rainy days: 4 days
Precipitation totals: 1.9 in.

Air temperature in May, °F

Show year:
2025
2024
2023

The highest day temperature during May of 2025 was 85°F. At the same time the lowest night temperature was 44°F. Daily and nightly averages during May were 69.7°F and 55.8°F.

Sunny, partly cloudy and cloudy days

Number of sunny, partly cloudy and cloudy days in May is almost equal.

Precipitation total in May, in.

Precipitation total value in Saint Charles in May is 1.9 in. Other months of the year show relatively similar values.

Wind speed in May, mph

The average wind speed value in May is 8.0 mph

Average sunny hours

This chart shows average number of hours during the day when sunlight can reach the ground. It depends on day length and cloudiness during the day. The average number of sunny hours in May is: 7.5.

Best time for vacation in Saint Charles

Sunniest months:
September 19 days
October 19 days
November 16 days
Warmest months:
July 87.1 °F
August 85.9 °F
June 84.1 °F
Coldest months:
January 36.0 °F
February 40.8 °F
December 44.4 °F
Rainiest months:
May 4 days
July 4 days
March 3 days
Windiest months:
March 10.2 mph
April 9.7 mph
February 8.8 mph

Saint Charles on a weather map

Saint Charles
+54°F
S 6 mph
Feels like: +54°F
Precip.: 0%
Places in USA:
Name
°F
+50°F
+75°F
+75°F
+64°F
+59°F
+77°F
+79°F
+70°F
+37°F
+63°F
+57°F
+79°F
+77°F
+75°F
+41°F
24 Hours Forecast
Saint Charles
Local time: 18:03
December 23, tuesday
2100
50°F
SW
6 mph
December 24, wednesday
0000
48°F
SW
5 mph
0300
46°F
W
6 mph
0600
46°F
W
7 mph
0900
48°F
NW
7 mph
1200
52°F
NW
9 mph
1500
55°F
NW
7 mph
1800
59°F
N
8 mph
Units of measurement: °C / °F