10-day forecast for St. Clair, MO: 67° to 103°, with precipitation expected on 3 days. The table below breaks each day into morning, afternoon, evening and overnight.
103°
Best day: Tuesday, August 11
93° · 0.11 in
Worst day: Monday, August 17
Tap any day below to see morning, afternoon, evening and overnight.
Mon, 10101° / 76°0
Morning79°feels 79°
Afternoon100°feels 103°
Evening88°feels 90°
Overnight83°feels 87°
101 °
St. Clair, Monday, 10 August
Mostly clear. High 101°, low 76°.
Pressure29.94 inHg
Wind12.1 mph SW
Humidity37%
Visibility6.2 mi
Dew point66°
Tue, 11103° / 72°0
Morning79°feels 79°
Afternoon102°feels 103°
Evening87°feels 88°
Overnight72°feels 73°
103 °
St. Clair, Tuesday, 11 August
Partly cloudy. High 103°, low 72°.
Pressure29.88 inHg
Wind12.6 mph SW
Humidity34%
Visibility6.2 mi
Dew point65°
Wed, 1299° / 75°0.01
Morning79°feels 79°
Afternoon100°feels 104°
Evening83°feels 86°
Overnight85°feels 87°
99 °
St. Clair, Wednesday, 12 August
Light rain. High 99°, low 75°.
Pressure29.83 inHg
Wind9.8 mph W
Humidity37%
Visibility6.2 mi
Dew point67°
Thu, 1397° / 71°0.14
Morning78°feels 80°
Afternoon91°feels 96°
Evening81°feels 85°
Overnight75°feels 76°
97 °
St. Clair, Thursday, 13 August
Light rain. High 97°, low 71°.
Pressure29.88 inHg
Wind14.2 mph E
Humidity45%
Visibility—
Dew point66°
Fri, 1480° / 70°0
Morning71°feels 72°
Afternoon73°feels 74°
Evening76°feels 77°
Overnight70°feels 71°
80 °
St. Clair, Friday, 14 August
Overcast. High 80°, low 70°.
Pressure30.03 inHg
Wind13.3 mph E
Humidity81%
Visibility—
Dew point66°
Sat, 15100° / 67°0.04
Morning74°feels 76°
Afternoon92°feels 96°
Evening86°feels 92°
Overnight75°feels 76°
100 °
St. Clair, Saturday, 15 August
Light rain. High 100°, low 67°.
Pressure30.06 inHg
Wind10.3 mph NE
Humidity45%
Visibility—
Dew point65°
Sun, 1697° / 73°0
Morning78°feels 80°
Afternoon91°feels 98°
Evening87°feels 94°
Overnight78°feels 78°
97 °
St. Clair, Sunday, 16 August
Mostly clear. High 97°, low 73°.
Pressure30.03 inHg
Wind9.1 mph NW
Humidity51%
Visibility—
Dew point68°
Mon, 1793° / 72°0.11
Morning77°feels 79°
Afternoon87°feels 92°
Evening79°feels 80°
Overnight75°feels 76°
93 °
St. Clair, Monday, 17 August
Light rain. High 93°, low 72°.
Pressure30.03 inHg
Wind6.9 mph E
Humidity56%
Visibility—
Dew point69°
Tue, 18102° / 70°0.04
Morning77°feels 80°
Afternoon96°feels 103°
Evening91°feels 98°
Overnight78°feels 78°
102 °
St. Clair, Tuesday, 18 August
Light rain. High 102°, low 70°.
Pressure29.91 inHg
Wind8.5 mph SE
Humidity44%
Visibility—
Dew point67°
About this forecast
How reliable is a 10-day forecast?
The first 3–5 days are the most reliable, typically within 2–4°. From day six to ten the models show the trend: the direction of change is right more often than the exact numbers.
What does the time-of-day table show?
Temperature in St. Clair, MO around 8am, 2pm, 8pm and 2am each day — handy for planning a walk, a drive or work outdoors.
How is the best day chosen?
We weigh the daytime high against precipitation: a warm, dry day scores highest.