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Washington County, MO Weather Forecast
Washington County, MO Weather Forecast Dated: 858 AM Sun Sep 13 2026
Expect a very warm period with a mix of sun and clouds and frequent chances of rain over the coming period. generally humid conditions and no major pressure swings will dominate.
Sunday, September 13, 2026
Mid-Morning
68°F 20°C
Overcast
Mid-Afternoon
87°F 30°C
Overcast
Early-Evening
77°F 26°C
Overcast
Warm and summery near 87°F 30°C, overcast throughout the day, with lower humidity and steady pressure.
Monday, September 14, 2026
Mid-Morning
67°F 19°C
Sunny
Mid-Afternoon
88°F 31°C
Overcast
Early-Evening
83°F 28°C
Sunny
Balmy with temperatures reaching 88°F 31°C, sunny in the morning, overcast in the afternoon, and sunny this evening, with steady humidity and barometric pressure falling. Winds turning from the E to the SE at 8 mph 13 km/h. Gusts up to 20 mph 32 km/h.
Tuesday, September 15, 2026
Mid-Morning
80°F 27°C
Sunny
Mid-Afternoon
96°F 36°C
Overcast
Early-Evening
83°F 29°C
Scattered Showers
Sizzling hot with 96°F 36°C, locally heavy downpours at times, with increasing humidity and steady pressure. Winds switching from the SSW to the NNE at 3 mph 5 km/h.
Wednesday, September 16, 2026
Mid-Morning
73°F 23°C
Sunny
Mid-Afternoon
91°F 33°C
Sunny
Early-Evening
83°F 28°C
Partly Cloudy
Sizzling hot near 91°F 33°C with a heat index reaching 99°F 37°C, sunny through the afternoon, turning cloudy this evening, with lower humidity and steady pressure.
Thursday, September 17, 2026
Mid-Morning
71°F 22°C
Scattered Showers
Mid-Afternoon
89°F 32°C
Sunny
Early-Evening
79°F 26°C
Cloudy
Quite warm reaching 89°F 32°C, feeling like 92°F 33°C during peak afternoon, scattered downpours possible, with lower humidity and steady pressure. Winds moving from the NNW to the NNE at 7 mph 10 km/h.
Friday, September 18, 2026
Mid-Morning
72°F 22°C
Fog
Mid-Afternoon
85°F 29°C
Sunny
Early-Evening
79°F 26°C
Sunny
Warm and summery near 85°F 29°C, partly cloudy in the morning, becoming sunny through the afternoon and evening, with lower humidity and barometric pressure falling.
Saturday, September 19, 2026
Mid-Morning
77°F 25°C
Sunny
Mid-Afternoon
94°F 34°C
Sunny
Early-Evening
83°F 29°C
Cloudy
Hot and sweltering around 94°F 34°C, sunny in the morning, cloudy in the afternoon, and overcast this evening, with steady humidity and barometric pressure falling.
Sunday, September 20, 2026
Mid-Morning
70°F 21°C
Light Showers
Mid-Afternoon
83°F 28°C
Overcast
Early-Evening
76°F 25°C
Nearby Thunderstorms
Quite warm reaching 83°F 28°C, feeling like 86°F 30°C during peak afternoon, scattered downpours possible, with lower humidity and steady pressure.
Monday, September 21, 2026
Mid-Morning
67°F 19°C
Light Showers
Mid-Afternoon
70°F 21°C
Light Showers
Early-Evening
61°F 16°C
Scattered Showers
Mild temperatures up to 70°F 21°C, locally heavy downpours at times, with steady humidity and steady pressure. Winds swinging from the W to the NW at 8 mph 13 km/h.
Tuesday, September 22, 2026
Mid-Morning
52°F 11°C
Overcast
Mid-Afternoon
56°F 13°C
Overcast
Early-Evening
53°F 12°C
Overcast
Cool and brisk at 56°F 13°C, overcast throughout the day, with lower humidity and steady pressure. Winds blowing from the NW at 12 mph 19 km/h. Gusts up to 20 mph 32 km/h.
Wednesday, September 23, 2026
Mid-Morning
51°F 11°C
Overcast
Mid-Afternoon
65°F 18°C
Sunny
Early-Evening
60°F 15°C
Sunny
Comfortable at 65°F 18°C, cloudy in the morning, becoming sunny through the afternoon and evening, with lower humidity and steady pressure. Winds NNW at 12 mph 19 km/h. Gusts up to 20 mph 32 km/h.
Thursday, September 24, 2026
Mid-Morning
55°F 13°C
Sunny
Mid-Afternoon
67°F 20°C
Sunny
Early-Evening
61°F 17°C
Sunny
Cool with a high near 67°F 20°C, sunny throughout the day, with increasing humidity and steady pressure. Winds switching from the NNW to the NNE at 5 mph 9 km/h.
Friday, September 25, 2026
Mid-Morning
58°F 15°C
Fog
Mid-Afternoon
71°F 21°C
Sunny
Early-Evening
63°F 17°C
Sunny
Enjoyable around 71°F 21°C, partly cloudy in the morning, becoming sunny through the afternoon and evening, with lower humidity and steady pressure.
Saturday, September 26, 2026
Mid-Morning
60°F 16°C
Sunny
Mid-Afternoon
73°F 23°C
Sunny
Early-Evening
66°F 19°C
Sunny
Mild temperatures up to 73°F 23°C, sunny through the afternoon, turning partly cloudy this evening, with steady humidity and steady pressure.
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