Alton, Illinois Weather Forecast
Today in Alton: slight rain showers with a high near 60°F and a low around 47°F. Rain chance 28%. No day tops a 20% rain chance through Thursday. Warming trend: highs climb from 60°F today to 71°F by Monday.
Forecast updated 9:05 PM CDT, Oct 16
Active Weather Alerts
7-Day Forecast for Alton
Today 10/16
28%
60°47°
Sat 10/17
60°39°
Sun 10/18
65°38°
Mon 10/19
71°39°
Tue 10/20
73°43°
Wed 10/21
76°44°
Thu 10/22
77°48°
Next 24 Hours
| Now | 11 PM | Sat12 AM | 1 AM | 2 AM | 3 AM | 4 AM | 5 AM | 6 AM | 7 AM | 8 AM | 9 AM | 10 AM | 11 AM | 12 PM | 1 PM | 2 PM | 3 PM | 4 PM | 5 PM | 6 PM | 7 PM | 8 PM | 9 PM | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sky |  | | | | |  | | | | | | | | | | | | | | | | | | |
| Temp | 50° | 49° | 48° | 47° | 46° | 44° | 43° | 42° | 40° | 39° | 40° | 44° | 48° | 51° | 54° | 56° | 58° | 59° | 60° | 59° | 56° | 53° | 50° | 48° |
| Rain | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% |
| Wind | NNW 15 | NNW 14 | N 13 | N 11 | N 11 | N 10 | N 9 | N 8 | N 7 | N 6 | N 6 | N 7 | NNE 6 | NE 5 | ENE 4 | ENE 4 | ENE 3 | ENE 3 | NE 3 | ENE 2 | E 1 | E 1 | E 0 | E 0 |
Growing Conditions
Growing degree days
4,246
since Apr 1, base 50°F
Rain, last 30 days
3.63 in
model analysis
Rain, year to date
44.00 in
since Jan 1
2-inch soil temperature
71°F
yesterday, daily average
Reference ET, last 7 days
0.90 in
FAO-56 grass reference
Through Oct 15. Season totals use model analysis for this point and update every morning.
Soil, ET and spray tools for Alton →
Current Stats & Observations
NWS Forecast
About Alton Weather
Alton sits at about 545 feet above sea level in Madison County, Illinois. About 78,905 people live in the Alton area. Official forecasts and warnings for the area come from the National Weather Service LSX office, and the nearest NEXRAD radar site is KLSX. The city is in USDA plant hardiness zone 7a, where the coldest winter night typically falls between 0 to 5°F. Over the past ten years the last spring freeze has come around Apr 1 and the first fall freeze around Nov 4.
Nearby Forecasts
Florissant, MO
St. Louis, MO
St. Charles, MO
St. Peters, MO
O'Fallon, MO
Springfield, IL
Decatur, IL
Carbondale, IL
Largest Cities in Illinois
Chicago, IL
Rockford, IL
Round Lake Beach, IL
Peoria, IL
Aurora, IL
Champaign, IL
Springfield, IL
Naperville, IL
Joliet, IL
Bloomington, IL
All Illinois forecasts (34) →
All states →
Interactive forecast tools →