10-day forecast for Vandalia, IL: 65° to 98°, with precipitation expected on 5 days. The table below breaks each day into morning, afternoon, evening and overnight.
95°
Best day: Tuesday, August 11
73° · 0.19 in
Worst day: Friday, August 14
Tap any day below to see morning, afternoon, evening and overnight.
Mon, 1098° / 73°0.2
Morning79°feels 79°
Afternoon97°feels 110°
Evening85°feels 89°
Overnight81°feels 86°
98 °
Vandalia, Monday, 10 August
Rain. High 98°, low 73°.
Pressure29.94 inHg
Wind14.2 mph SW
Humidity60%
Visibility6.2 mi
Dew point73°
Tue, 1195° / 72°0
Morning74°feels 74°
Afternoon94°feels 105°
Evening85°feels 90°
Overnight72°feels 73°
95 °
Vandalia, Tuesday, 11 August
Overcast. High 95°, low 72°.
Pressure29.91 inHg
Wind12.8 mph SW
Humidity66%
Visibility6.2 mi
Dew point74°
Wed, 1289° / 75°0.17
Morning77°feels 78°
Afternoon89°feels 97°
Evening81°feels 87°
Overnight82°feels 84°
89 °
Vandalia, Wednesday, 12 August
Rain. High 89°, low 75°.
Pressure29.83 inHg
Wind6 mph NW
Humidity74%
Visibility6.2 mi
Dew point73°
Thu, 1385° / 69°0.21
Morning73°feels 76°
Afternoon83°feels 87°
Evening74°feels 76°
Overnight69°feels 71°
85 °
Vandalia, Thursday, 13 August
Light rain. High 85°, low 69°.
Pressure29.91 inHg
Wind12.8 mph NE
Humidity65%
Visibility—
Dew point69°
Fri, 1473° / 65°0.19
Morning67°feels 68°
Afternoon72°feels 73°
Evening70°feels 71°
Overnight66°feels 67°
73 °
Vandalia, Friday, 14 August
Light rain. High 73°, low 65°.
Pressure30.09 inHg
Wind16.3 mph E
Humidity81%
Visibility—
Dew point65°
Sat, 1582° / 65°0.16
Morning69°feels 69°
Afternoon79°feels 80°
Evening77°feels 79°
Overnight70°feels 71°
82 °
Vandalia, Saturday, 15 August
Light rain. High 82°, low 65°.
Pressure30.15 inHg
Wind13 mph E
Humidity73%
Visibility—
Dew point67°
Sun, 1685° / 68°0
Morning73°feels 75°
Afternoon84°feels 91°
Evening81°feels 87°
Overnight73°feels 75°
85 °
Vandalia, Sunday, 16 August
Overcast. High 85°, low 68°.
Pressure30.03 inHg
Wind9.4 mph E
Humidity71%
Visibility—
Dew point71°
Mon, 1784° / 70°0
Morning74°feels 75°
Afternoon82°feels 85°
Evening78°feels 79°
Overnight74°feels 74°
84 °
Vandalia, Monday, 17 August
Partly cloudy. High 84°, low 70°.
Pressure30.06 inHg
Wind8.9 mph NE
Humidity64%
Visibility—
Dew point67°
Tue, 1887° / 66°0
Morning71°feels 73°
Afternoon84°feels 88°
Evening80°feels 84°
Overnight75°feels 76°
87 °
Vandalia, Tuesday, 18 August
Overcast. High 87°, low 66°.
Pressure30.00 inHg
Wind9.4 mph SE
Humidity59%
Visibility—
Dew point66°
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 Vandalia, IL 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.