10-day forecast for Decatur, IL: 41° to 77°, with precipitation expected on 3 days. The table below breaks each day into morning, afternoon, evening and overnight.
77°
Best day: Thursday, October 29
64° · 0.37 in
Worst day: Saturday, October 31
Tap any day below to see morning, afternoon, evening and overnight.
Fri, 3074° / 54°0
Morning56°feels 55°
Afternoon73°feels 72°
Evening63°feels 61°
Overnight59°feels 58°
74 °
Decatur, Friday, 30 October
Overcast. High 74°, low 54°.
Pressure30.30 inHg
Wind9 mph E
Humidity51%
Visibility6.2 mi
Dew point47°
Sat, 3164° / 55°0.37
Morning55°feels 54°
Afternoon62°feels 61°
Evening59°feels 57°
Overnight55°feels 54°
64 °
Decatur, Saturday, 31 October
Heavy rain. High 64°, low 55°.
Pressure30.30 inHg
Wind7.7 mph E
Humidity61%
Visibility6.2 mi
Dew point46°
Sun, 0163° / 55°0.2
Morning56°feels 55°
Afternoon62°feels 62°
Evening60°feels 60°
Overnight58°feels 57°
63 °
Decatur, Sunday, 1 November
Rain. High 63°, low 55°.
Pressure30.30 inHg
Wind8.8 mph SE
Humidity72%
Visibility4.8 mi
Dew point54°
Mon, 0264° / 56°0.03
Morning58°feels 58°
Afternoon63°feels 62°
Evening62°feels 61°
Overnight56°feels 55°
64 °
Decatur, Monday, 2 November
Light rain. High 64°, low 56°.
Pressure30.09 inHg
Wind13.1 mph S
Humidity75%
Visibility—
Dew point54°
Tue, 0373° / 62°0.03
Morning65°feels 65°
Afternoon72°feels 72°
Evening69°feels 69°
Overnight69°feels 69°
73 °
Decatur, Tuesday, 3 November
Light rain. High 73°, low 62°.
Pressure29.85 inHg
Wind19.8 mph S
Humidity65%
Visibility—
Dew point58°
Wed, 0469° / 53°0.39
Morning63°feels 64°
Afternoon62°feels 62°
Evening58°feels 58°
Overnight55°feels 55°
69 °
Decatur, Wednesday, 4 November
Rain. High 69°, low 53°.
Pressure29.65 inHg
Wind22.1 mph SE
Humidity81%
Visibility—
Dew point57°
Thu, 0554° / 44°0
Morning46°feels 41°
Afternoon51°feels 48°
Evening47°feels 43°
Overnight45°feels 40°
54 °
Decatur, Thursday, 5 November
Clear. High 54°, low 44°.
Pressure29.91 inHg
Wind15.6 mph W
Humidity37%
Visibility—
Dew point25°
Fri, 0658° / 41°0
Morning45°feels 42°
Afternoon56°feels 53°
Evening49°feels 47°
Overnight45°feels 42°
58 °
Decatur, Friday, 6 November
Mostly clear. High 58°, low 41°.
Pressure30.00 inHg
Wind9.8 mph W
Humidity33%
Visibility—
Dew point26°
Sat, 0758° / 41°0
Morning46°feels 42°
Afternoon56°feels 53°
Evening53°feels 51°
Overnight51°feels 48°
58 °
Decatur, Saturday, 7 November
Overcast. High 58°, low 41°.
Pressure30.15 inHg
Wind9.8 mph SE
Humidity37%
Visibility—
Dew point28°
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 Decatur, 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.