St. Charles Weather in May
May in St. Charles brings high temperatures, with daytime highs of 25°C (77°F) and nights around 13°C (55°F). Quite a bit of rainfall is expected, around 122 mm (4.8 in), so pack an umbrella.
Rainfall in St. Charles in May
Historically, the month has about 14 days of rain, averaging 122 mm (4.8 in) in total. Individual showers can be quite heavy this month. A proper umbrella or rain jacket is worth having.
Temperature in St. Charles in May
St. Charles in May gets highs of 25°C (77°F) during the day and drops to 13°C (55°F) at night. Overall, the month follows a fairly predictable daily temperature pattern. At 13°C (55°F) overnight, it can feel quite a bit cooler after dark. Worth packing something warmer for evenings, but the cooler temperatures are ideal for sleeping.
Sunshine in St. Charles in May
With approximately 269 hours of sunshine, the days are filled with clear skies. It makes it a perfect month for being outside.Should you favor a climate that's both dry and comfortably warm, September and October typically offer the most agreeable circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the United States of America, check out our St. Charles's climate page.
St. Charles Temperature in May
Min Temperature
13°C (55°F)
Max Temperature
25°C (77°F)
Chance of Rain
45%
Precipitation
122 mm (4.8 in)
Rainy days
14 days
Humidity
65% *
Sunshine
269 hours *
Percentage Sunshine
60% *
Best Places in the United States of America in May
Find out more about the weather in the United States of America and which places have the best travel conditions in this month. See all of the United States of America in May →
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What to Wear in St. Charles in May
Pleasant temperatures in May mean you can pack light but flexibel pieces. Think cotton t-shirts, comfortable walking shorts, and one warmer layer for evenings. A light sweater or denim jacket works well. Prepare for significant rainfall with proper waterproof clothing and shoes. And with plenty of sunshine hours, don’t forget sunglasses, sunscreen, and maybe a sun hat.What To Do in St. Charles in May
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the United States of America, check out our St. Charles's climate page.
Temperature Rainfall Sunshine Humidity
See the full St. Charles climate overview or explore weather in the United States of America.
