O'Fallon Weather in March

March in O'Fallon averages 14°C (57°F) during the day and 2°C (36°F) at night. Quite a bit of rainfall is typical this month, with around 95 mm (3.7 in) on average. An umbrella is a good idea.

Rainfall in O'Fallon in March

Historically, the month has about 11 days of rain, averaging 95 mm (3.7 in) in total. The rain this month tends to fall in heavier spells rather than light drizzle. When it rains, showers can be significant.

Temperature in O'Fallon in March

Temperatures in O'Fallon in March top out at 14°C (57°F) and drop to 2°C (36°F) overnight. Conditions are often most pleasant around the middle of the day. With overnight lows of 2°C (36°F), nights are cold. The cold air does make for deep, comfortable sleep if you have enough blankets.

Sunshine in O'Fallon in March

With approximately 199 hours of sunshine, the days are filled with clear skies. Despite it being a cool month, it makes for pleasant days outside.

If you prefer enjoying temperate temperatures and rain-free days, October typically offers the best circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.