10-day forecast for Grafton, IL: 65° to 98°, with precipitation expected on 6 days. The table below breaks each day into morning, afternoon, evening and overnight.
96°
Best day: Sunday, August 9
98° · 0.66 in
Worst day: Monday, August 10
Tap any day below to see morning, afternoon, evening and overnight.
Mon, 1098° / 69°0.66
Morning79°feels 80°
Afternoon97°feels 103°
Evening88°feels 93°
Overnight81°feels 84°
98 °
Grafton, Monday, 10 August
Heavy rain. High 98°, low 69°.
Pressure29.91 inHg
Wind12.4 mph SW
Humidity47%
Visibility6.2 mi
Dew point70°
Tue, 1198° / 70°0.21
Morning77°feels 78°
Afternoon97°feels 104°
Evening87°feels 88°
Overnight75°feels 76°
98 °
Grafton, Tuesday, 11 August
Heavy rain. High 98°, low 70°.
Pressure29.88 inHg
Wind13.5 mph SW
Humidity51%
Visibility6.2 mi
Dew point71°
Wed, 1293° / 74°0.15
Morning79°feels 79°
Afternoon93°feels 100°
Evening77°feels 78°
Overnight78°feels 79°
93 °
Grafton, Wednesday, 12 August
Rain. High 93°, low 74°.
Pressure29.83 inHg
Wind6.7 mph NW
Humidity57%
Visibility6.2 mi
Dew point71°
Thu, 1384° / 70°0.19
Morning74°feels 76°
Afternoon83°feels 87°
Evening75°feels 76°
Overnight73°feels 74°
84 °
Grafton, Thursday, 13 August
Light rain. High 84°, low 70°.
Pressure29.91 inHg
Wind13.1 mph NE
Humidity65%
Visibility—
Dew point69°
Fri, 1472° / 65°0.14
Morning66°feels 66°
Afternoon69°feels 70°
Evening71°feels 72°
Overnight67°feels 67°
72 °
Grafton, Friday, 14 August
Light rain. High 72°, low 65°.
Pressure30.06 inHg
Wind15.4 mph E
Humidity85%
Visibility—
Dew point63°
Sat, 1584° / 65°0.13
Morning68°feels 69°
Afternoon77°feels 78°
Evening79°feels 79°
Overnight72°feels 74°
84 °
Grafton, Saturday, 15 August
Light rain. High 84°, low 65°.
Pressure30.12 inHg
Wind11.8 mph E
Humidity81%
Visibility—
Dew point68°
Sun, 1688° / 70°0
Morning74°feels 77°
Afternoon86°feels 94°
Evening83°feels 91°
Overnight74°feels 75°
88 °
Grafton, Sunday, 16 August
Overcast. High 88°, low 70°.
Pressure30.03 inHg
Wind9.2 mph E
Humidity68%
Visibility—
Dew point72°
Mon, 1786° / 70°0
Morning74°feels 76°
Afternoon83°feels 86°
Evening79°feels 79°
Overnight74°feels 74°
86 °
Grafton, Monday, 17 August
Mostly clear. High 86°, low 70°.
Pressure30.06 inHg
Wind6.8 mph E
Humidity62%
Visibility—
Dew point68°
Tue, 1891° / 68°0.02
Morning73°feels 75°
Afternoon86°feels 91°
Evening82°feels 87°
Overnight77°feels 77°
91 °
Grafton, Tuesday, 18 August
Light rain. High 91°, low 68°.
Pressure29.97 inHg
Wind12 mph E
Humidity59%
Visibility—
Dew point68°
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 Grafton, 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.