O'Fallon, MO 14 Day Weather - 63366 WeatherWorld.com

Very hot with temperatures reaching 92°F 34°C, partly cloudy in the morning, sunny in the afternoon, and cloudy this evening, with lower humidity and steady pressure. Winds out of the ENE at 10 mph 16 km/h.

Hot and sweltering around 90°F 32°C, sunny throughout the day, with lower humidity and steady pressure. Winds switching from the SE to the ESE at 6 mph 10 km/h.

Sizzling hot with 98°F 37°C, partly cloudy in the morning, sunny in the afternoon, and cloudy this evening, with steady humidity and steady pressure. Winds moving from the SSE to the S at 8 mph 12 km/h.

Dangerously hot with a high of 101°F 38°C, sunny through the afternoon, turning overcast this evening, with steady humidity and steady pressure. Winds swinging from the SW to the WNW at 8 mph 13 km/h.

Very warm with a high of 85°F 29°C, scattered downpours possible, with steady humidity and steady pressure. Winds shifting from the WNW to the E at 11 mph 18 km/h. Gusts up to 25 mph 39 km/h.

Pleasant near 73°F 23°C, morning showers, giving way to clearing skies, with lower humidity and steady pressure.

Balmy with temperatures reaching 81°F 27°C, periods of heavy rain and gusty conditions, with lower humidity and steady pressure.

Quite warm reaching 85°F 30°C, feeling like 88°F 31°C during peak afternoon, sunny in the morning, becoming cloudy through the afternoon and evening, with steady humidity and steady pressure. Winds turning from the SSW to the NW at 9 mph 14 km/h. Gusts up to 20 mph 32 km/h.

Warm temperatures up to 81°F 27°C, locally heavy downpours at times, with lower humidity and steady pressure. Winds out of the NNE at 8 mph 13 km/h.

Mild with a high of 77°F 25°C, sunny throughout the day, with lower humidity and barometric pressure falling.

Warm and summery near 87°F 31°C, sunny in the morning, becoming cloudy through the afternoon and evening, with steady humidity and barometric pressure falling. Winds blowing from the S at 5 mph 9 km/h.

Very hot with a high of 97°F 36°C, feeling closer to 101°F 38°C in the humidity, locally heavy downpours at times, with steady humidity and steady pressure. Winds swinging from the SSW to the S at 8 mph 13 km/h.

Sizzling hot near 99°F 37°C with a heat index reaching 102°F 39°C, sunny throughout the day, with lower humidity and steady pressure. Winds shifting from the SW to the S at 9 mph 14 km/h.

Hot temperatures near 98°F 37°C, sunny in the morning, cloudy in the afternoon, and sunny this evening, with lower humidity and steady pressure. Winds turning from the SSW to the S at 9 mph 15 km/h.