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As of 02:10 CDT

Weather in Alton, IL

75°Current weather

Alton, Sunday, 9 August, 02:10

Clear. Feels like 76°. High 98°, low 72°.

Pressure30.00 inHg
Wind6.9 mph S
Humidity91%
Visibility6.2 mi
Dew point72°

10-day forecast for Alton, IL: 65° to 99°, with precipitation expected on 6 days. The table below breaks each day into morning, afternoon, evening and overnight.

98°
Best day: Sunday, August 9
84° · 0.28 in
Worst day: Thursday, August 13

Tap any day below to see morning, afternoon, evening and overnight.

Mon, 1099° / 70°0.36Heavy rain
MorningOvercast79°feels 79°
AfternoonOvercast98°feels 105°
EveningPartly cloudy89°feels 95°
OvernightClear81°feels 83°
99 °Heavy rain

Alton, Monday, 10 August

Heavy rain. High 99°, low 70°.

Pressure29.91 inHg
Wind11.4 mph SW
Humidity46%
Visibility6.2 mi
Dew point69°
Tue, 1199° / 72°0.09Rain
MorningOvercast79°feels 80°
AfternoonClear98°feels 104°
EveningMostly clear88°feels 89°
OvernightOvercast75°feels 76°
99 °Rain

Alton, Tuesday, 11 August

Rain. High 99°, low 72°.

Pressure29.88 inHg
Wind12.4 mph SW
Humidity49%
Visibility6.2 mi
Dew point71°
Wed, 1292° / 75°0.19Rain
MorningOvercast80°feels 84°
AfternoonPartly cloudy93°feels 100°
EveningRain79°feels 79°
OvernightLight rain83°feels 84°
92 °Rain

Alton, Wednesday, 12 August

Rain. High 92°, low 75°.

Pressure29.83 inHg
Wind7.8 mph NW
Humidity58%
Visibility6.2 mi
Dew point71°
Thu, 1384° / 71°0.28Light rain
MorningLight rain74°feels 77°
AfternoonLight rain83°feels 87°
EveningLight rain75°feels 77°
OvernightOvercast73°feels 75°
84 °Light rain

Alton, Thursday, 13 August

Light rain. High 84°, low 71°.

Pressure29.91 inHg
Wind12.8 mph E
Humidity67%
Visibility—
Dew point70°
Fri, 1472° / 65°0.14Light rain
MorningLight rain66°feels 67°
AfternoonLight rain70°feels 70°
EveningLight rain71°feels 72°
OvernightLight rain67°feels 68°
72 °Light rain

Alton, Friday, 14 August

Light rain. High 72°, low 65°.

Pressure30.06 inHg
Wind14.8 mph E
Humidity85%
Visibility—
Dew point64°
Sat, 1585° / 65°0.12Light rain
MorningLight rain69°feels 70°
AfternoonLight rain78°feels 80°
EveningLight rain79°feels 84°
OvernightLight rain73°feels 74°
85 °Light rain

Alton, Saturday, 15 August

Light rain. High 85°, low 65°.

Pressure30.12 inHg
Wind11.7 mph SE
Humidity80%
Visibility—
Dew point69°
Sun, 1688° / 70°0Overcast
MorningOvercast74°feels 78°
AfternoonOvercast86°feels 95°
EveningOvercast83°feels 92°
OvernightOvercast74°feels 76°
88 °Overcast

Alton, Sunday, 16 August

Overcast. High 88°, low 70°.

Pressure30.03 inHg
Wind9.5 mph E
Humidity68%
Visibility—
Dew point72°
Mon, 1786° / 71°0Mostly clear
MorningMostly clear75°feels 77°
AfternoonMostly clear84°feels 88°
EveningMostly clear80°feels 83°
OvernightMostly clear74°feels 75°
86 °Mostly clear

Alton, Monday, 17 August

Mostly clear. High 86°, low 71°.

Pressure30.06 inHg
Wind6.5 mph E
Humidity62%
Visibility—
Dew point68°
Tue, 1890° / 68°0.01Light rain
MorningLight rain73°feels 75°
AfternoonLight rain86°feels 91°
EveningLight rain82°feels 87°
OvernightLight rain77°feels 77°
90 °Light rain

Alton, Tuesday, 18 August

Light rain. High 90°, low 68°.

Pressure29.97 inHg
Wind10.3 mph SE
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 Alton, 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.