O'Fallon Weather in June

Thinking of visiting O'Fallon in June? Expect high temperatures reaching 30°C (86°F) during the day, dropping to 18°C (64°F) at night, and be prepared for the wettest month of the year.

Rainfall in O'Fallon in June

An umbrella might come in handy since it is the wettest month of the year. Expect around 12 days of rain based on historical data, with 119 mm (4.7 in) average. When showers do arrive, they tend to be on the heavier side. Worth being prepared even if rain days are not that numerous.

Temperature in O'Fallon in June

Expect highs of 30°C (86°F) in O'Fallon in June, with nights dropping to around 18°C (64°F). Conditions stay fairly consistent through the month, making it easier to plan what to wear. With lows of 18°C (64°F), nights are cool. If you're out after dark, an extra layer will keep you comfortable. The cooler air at night is also great for getting a good rest.

Sunshine in O'Fallon in June

The city usually sees around 293 hours of sunlight, indicating many sunny days , a great month for sightseeing.

Should you favor a climate that's both dry and comfortably warm, October typically offers 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.