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.