St. John, MO 14 Day Weather - WeatherWorld.com
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St. John, MO Weather Forecast


St. John, MO Weather Forecast Dated: 456 AM Sat Sep 12 2026
Expect a very warm period with plenty of sunshine and occasional showers over the coming period. moderate humidity and no major pressure swings will dominate.
Saturday, September 12, 2026
Mid-Morning
76°F 25°C
Sunny
Mid-Afternoon
93°F 34°C
Sunny
Early-Evening
88°F 31°C
Sunny
Very hot with temperatures reaching 93°F 34°C, sunny throughout the day, with lower humidity and steady pressure.
Sunday, September 13, 2026
Mid-Morning
76°F 24°C
Overcast
Mid-Afternoon
92°F 33°C
Overcast
Early-Evening
81°F 28°C
Overcast
Hot and sweltering around 92°F 33°C, overcast through the afternoon, turning partly cloudy this evening, with lower humidity and steady pressure. Winds turning from the WNW to the NE at 12 mph 19 km/h.
Monday, September 14, 2026
Mid-Morning
64°F 18°C
Light Showers
Mid-Afternoon
82°F 28°C
Overcast
Early-Evening
83°F 29°C
Sunny
Quite warm around 82°F 28°C, morning showers, giving way to clearing skies, with lower humidity and barometric pressure falling. Winds switching from the E to the ESE at 7 mph 11 km/h.
Tuesday, September 15, 2026
Mid-Morning
85°F 29°C
Sunny
Mid-Afternoon
93°F 34°C
Sunny
Early-Evening
89°F 31°C
Sunny
Hot temperatures near 93°F 34°C, sunny through the afternoon, turning cloudy this evening, with steady humidity and steady pressure. Winds moving from the SSW to the ENE at 5 mph 8 km/h.
Wednesday, September 16, 2026
Mid-Morning
87°F 30°C
Sunny
Mid-Afternoon
99°F 37°C
Sunny
Early-Evening
88°F 31°C
Sunny
Very hot with a high of 99°F 37°C, sunny through the afternoon, turning partly cloudy this evening, with steady humidity and steady pressure.
Thursday, September 17, 2026
Mid-Morning
86°F 30°C
Sunny
Mid-Afternoon
98°F 37°C
Sunny
Early-Evening
92°F 34°C
Overcast
Very hot with temperatures reaching 98°F 37°C, sunny in the morning, becoming cloudy through the afternoon and evening, with lower humidity and steady pressure. Winds swinging from the SW to the SSW at 6 mph 10 km/h.
Friday, September 18, 2026
Mid-Morning
81°F 27°C
Scattered Showers
Mid-Afternoon
94°F 35°C
Scattered Showers
Early-Evening
79°F 26°C
Light Showers
Hot and sweltering around 94°F 35°C, periods of heavy rain and gusty conditions, with increasing humidity and steady pressure. Winds shifting from the SW to the WSW at 6 mph 10 km/h.
Saturday, September 19, 2026
Mid-Morning
66°F 19°C
Scattered Showers
Mid-Afternoon
73°F 23°C
Sunny
Early-Evening
68°F 20°C
Scattered Showers
Enjoyable around 73°F 23°C, scattered downpours possible, with lower humidity and steady pressure. Winds turning from the NW to the ESE at 13 mph 20 km/h.
Sunday, September 20, 2026
Mid-Morning
62°F 17°C
Overcast
Mid-Afternoon
73°F 23°C
Scattered Showers
Early-Evening
69°F 21°C
Cloudy
Mild temperatures up to 73°F 23°C, locally heavy downpours at times, with lower humidity and steady pressure. Winds switching from the NNE to the NE at 10 mph 16 km/h. Gusts up to 21 mph 34 km/h.
Monday, September 21, 2026
Mid-Morning
62°F 17°C
Sunny
Mid-Afternoon
75°F 24°C
Sunny
Early-Evening
70°F 21°C
Sunny
Mild with a high of 75°F 24°C, sunny through the afternoon, turning partly cloudy this evening, with lower humidity and barometric pressure falling.
Tuesday, September 22, 2026
Mid-Morning
65°F 19°C
Sunny
Mid-Afternoon
80°F 27°C
Sunny
Early-Evening
77°F 25°C
Sunny
Warm and summery near 80°F 27°C, sunny throughout the day, with lower humidity and barometric pressure falling.
Wednesday, September 23, 2026
Mid-Morning
74°F 23°C
Partly Cloudy
Mid-Afternoon
88°F 31°C
Sunny
Early-Evening
79°F 26°C
Sunny
Balmy with temperatures reaching 88°F 31°C, sunny throughout the day, with steady humidity and steady pressure. Winds moving from the SW to the N at 10 mph 16 km/h. Gusts up to 22 mph 35 km/h.
Thursday, September 24, 2026
Mid-Morning
62°F 17°C
Sunny
Mid-Afternoon
78°F 25°C
Sunny
Early-Evening
74°F 24°C
Sunny
Enjoyable around 78°F 25°C, sunny throughout the day, with lower humidity and steady pressure.
Friday, September 25, 2026
Mid-Morning
71°F 22°C
Partly Cloudy
Mid-Afternoon
96°F 35°C
Partly Cloudy
Early-Evening
92°F 33°C
Sunny
Hot temperatures near 96°F 35°C, overcast in the morning, becoming partly cloudy through the afternoon and evening, with steady humidity and barometric pressure falling. Winds swinging from the S to the SSW at 13 mph 20 km/h. Gusts up to 30 mph 48 km/h.
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