O'Fallon Weather in August

August in O'Fallon brings very high temperatures, with daytime highs of 31°C (88°F) and nights around 19°C (66°F). Quite a bit of rainfall is expected, around 80 mm (3.1 in), so pack an umbrella.

Rainfall in O'Fallon in August

Rain is expected on roughly 9 days, totalling around 80 mm (3.1 in) for the month. Individual showers can be quite heavy this month. A proper umbrella or rain jacket is worth having.

Temperature in O'Fallon in August

August in O'Fallon brings very high temperatures, with highs of 31°C (88°F) and nights around 19°C (66°F). If you're spending a lot of time outdoors, it helps to plan around the warmer part of the day. At 19°C (66°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 O'Fallon in August

There are approximately 268 hours of sunshine this month, resulting in mostly clear days.

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.