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WeatherLive › Illinois › Alton

Alton, IL Weather

Today Hourly 10-Day Weekend Monthly Radar Air Quality Climate
Current WeatherAlton · 3:42 PM CDT
32° | 16°
32°C
Feels like 32°
Mostly cloudy
WindSE 7 mph · Gusts 9 mph
Precip5% · –
Humidity37% · Dew point 15°
UV index6 High
Air Quality91 Moderate
Pressure30.00 inHg
Visibility6 mi
Sunrise / Sunset6:27 AM · 7:36 PM · 13h 9m

Weather map — Alton

Full radar →
Now
32°
10%
7 mph
16:00
32°
10%
8 mph
17:00
32°
10%
7 mph
18:00
31°
10%
8 mph
19:00
29°
1%
9 mph
20:00
27°
1%
9 mph
21:00
25°
4%
9 mph
22:00
24°
3%
9 mph
23:00
24°
3%
9 mph
00:00
23°
14%
8 mph
01:00
24°
7%
9 mph
02:00
24°
4%
10 mph
03:00
24°
12%
10 mph
04:00
23°
4%
9 mph
05:00
22°
4%
8 mph
06:00
22°
14%
7 mph
07:00
22°
12%
8 mph
08:00
23°
8%
9 mph
09:00
25°
2%
11 mph
10:00
28°
3%
12 mph
11:00
30°
1%
14 mph
12:00
32°
1%
14 mph
13:00
33°
1%
13 mph
14:00
35°
1%
13 mph

Today · Sat 8/29

High 32°
5% / –

Sunny. Winds SE at 9 mph.

Tonight · Sat 8/29

Low 22°
4% / –

Partly cloudy. Winds SE at 9 mph.

Tomorrow · Sun 8/30

36° | 22°
3% / –

Sunny. Winds S at 14 mph.

7-day trend

Alton · temperature + precipitation

10-day forecast

Updated 3:42 PM

Details & indices

Wind
7 mph SE
Gusts 9 mph
Humidity
37%
Dew point 15°
Pressure
30.00 inHg
Rising
UV index
6 — High
High today
Air Quality
Moderate
AQI 91 · US EPA
Allergy
Very high
Mugwort
Visibility
6 mi
Clear view
Allergy — Alton

🌿 Conditions right now

View all →
Birch
None
Grass
None
Oak
None
Alder
None
Hazel
None
Mugwort
High
Ragweed
Moderate

Sun & moon

Sunrise6:27 AM
Sunset7:36 PM
Length of day13h 9m
Moonrise8:14 PM
Moonset7:54 AM
Moon phase🌕 Full Moon · 97%
Next full moonSep 26 Harvest Moon
Latitude38.8906°N
Longitude-90.1843°E

Water temps nearby

View all →
No beaches within 50 miles
🌤️No rain expected in the next 90 minutes
Now+30+60+90 min
Minute-by-minute precip · HRRR nowcast

Daily planner

computed from today's forecast
Laundry day
Great
Line-drying weather
Grilling
Great
Fire up the grill
Running
Fair
Lace up outside
Patio
Great
Dinner outdoors
Nearby places in {{REGION}}
Chicago
Partly cloudy
28° 🌤️
Aurora
—
— 🌤️
Rockford
—
— 🌤️
Joliet
—
—
Naperville
Mostly cloudy
27°
Data sources · Saturday, August 29
Where the Alton forecast comes from
This page blends NOAA/NWS model guidance with global ensembles for the 10-day outlook, air quality and alerts. Data refreshes every hour, current conditions every 15 minutes. Coordinates: 38.8906°N, -90.1843°.
NBM + global weather models
Updated: 3:42 PM
Weather in Alton
The 10-day span for Alton runs from a high near 42° on Sunday down to 16° overnight on Saturday. About 0.42 in of precipitation is expected in total; the most likely wet day is Monday (66% chance). Wind is the one to watch: gusts to 35 mph around Wednesday. No watches or warnings are active for the area right now. Right now Alton is running about 70° warmer than Davenport. Longer view: variable mid-latitude weather in every season.
Alton, IL · Elev 492 ft · 38.89°N, 90.18°W · Illinois · Forecast computed for these exact coordinates
Powered by NWS/NOAA guidance, multi-model forecasts and official environmental feeds · NOAA/NWS · EPA AirNow · MET Norway · global models
Updated: 3:42 PM