Water Temperature of the Mississippi River in Alton, IL

Current Water Temperature

32.0°F 0.0°C
Frigid Dangerously Cold
32.0°F
Frigid < 50°F
Cold 50°–60°
Cool 60°–70°
Comfortable 70°–80°
Warm 80°+

Severe hypothermia and cold water shock risk. Unprotected swimming causes rapid loss of dexterity in under 5 minutes.

Measurement Time: Sunday, January 25, 2026, 9:00 AM CST

Temperature Locations

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Local Points of Interest

Maple Island; St. Louis, MO; Wood River, IL; Edward "Ted" and Pat Jones-Confluence Point State Park

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Mississippi River

Station Name: Alton 2SE - Melvin Price L&D
Data Source: USGS

Elevation Above Sea Level: 407 feet

Nearest Address:
Lock and Dam Way
Alton, IL 62002
Madison County

GPS Coordinates: 38.8664, -90.1464

Nearby Water Temperatures

Missouri River, St Charles, MO (18.4 mi)
Mississippi River, Cap Au Gris, MO (30.6 mi)
Missouri River, Labadle, MO (42.7 mi)
Mississippi River, Clarksville, MO (53.7 mi)
Illinois River, Florence, IL (58.4 mi)
Sugar Creek, Chatham, IL (60.7 mi)
Lick Creek, Springfield, IL (63.3 mi)
Big River, Bonne Terre, MO (66.4 mi)
Missouri River, Hermann, MO (70.4 mi)
Illinois River, La Grange, IL (77 mi)
Mississippi River, Saverton, MO (79.4 mi)
Huzzah Creek, Butts, MO (84.1 mi)
East Fork Black River, Lesterville, MO (98.3 mi)
Mississippi River, Quincy, IL (99.1 mi)
Mason Tazewell Drainage Ditch, Topeka, IL (101.6 mi)

Weather for Alton, Illinois

Current Weather

51.3°F
Clear
Conditions: Clear
Humidity: 79%
Feels Like: 48.2°F
Wind: ENE 3.9 mph
Wind Gusts: 3.8 mph
Pressure: 30.03 in
Precipitation: 0 in
Cloud Cover: 0%
Visibility: 11.4 mi
UV Index: 0

Weather Forecast

Overcast
Tue
H: 71°F
L: 41°F
Overcast
Wed
H: 69°F
L: 43°F
Overcast
Thu
H: 49°F
L: 39°F
Partly Cloudy
Fri
H: 47°F
L: 33°F
Sunny
Sat
H: 48°F
L: 29°F

Air Quality

EPA Index 1 • Good

Air quality is satisfactory, and air pollution poses little or no risk.

PM2.5
28.1 μg/m³
Moderate
PM10
29 μg/m³
Good
Ozone (O3)
0 μg/m³
Photochemical
NO2
54.9 μg/m³
Nitrogen Dioxide
SO2
7.6 μg/m³
Sulfur Dioxide
CO
469 μg/m³
Carbon Monoxide

Astronomical

Sun
10h 13m daylight
Sunrise 6:38 AM
Solar Noon 11:44 AM
Sunset 4:51 PM
Moon
New • 0%
Moonrise 8:12 AM
Transit 12:49 PM
Moonset 5:24 PM

Best Times for Fishing or Hunting

Major Periods

12:19 PM - 2:49 PM
11:54 PM - 2:24 AM

Minor Periods

7:42 AM - 9:12 AM
4:54 PM - 6:24 PM
Action Rating:
Very Good 4/5
Tuesday, November 10, 2026

Weather Forecast

Conditions: Overcast
Average Temperature: 54.1°F
Average Humidity: 73%
Chance of Rain: 0%
Wind: 5.2 mph
UV Index: 3.7

Air Quality

EPA Index 2 • Moderate
PM2.5
9.7 μg/m³
Good
PM10
10 μg/m³
Good
Ozone (O3)
29.5 μg/m³
Photochemical
NO2
27.9 μg/m³
Nitrogen Dioxide
SO2
3.7 μg/m³
Sulfur Dioxide
CO
265.8 μg/m³
Carbon Monoxide

Astronomical

Sun
10h 13m daylight
Sunrise 6:38 AM
Solar Noon 11:44 AM
Sunset 4:51 PM
Moon
New • 0%
Moonrise 8:12 AM
Transit 12:49 PM
Moonset 5:24 PM

Best Times for Fishing or Hunting

Major Periods

12:19 PM - 2:49 PM
11:54 PM - 2:24 AM

Minor Periods

7:42 AM - 9:12 AM
4:54 PM - 6:24 PM
Action Rating:
Very Good 4/5
Wednesday, November 11, 2026

Weather Forecast

Conditions: Overcast
Average Temperature: 54.1°F
Average Humidity: 73%
Chance of Rain: 4%
Wind: 19.3 mph
UV Index: 3.6

Air Quality

EPA Index 2 • Moderate
PM2.5
9.6 μg/m³
Good
PM10
9.9 μg/m³
Good
Ozone (O3)
34.5 μg/m³
Photochemical
NO2
22.8 μg/m³
Nitrogen Dioxide
SO2
2.9 μg/m³
Sulfur Dioxide
CO
268.4 μg/m³
Carbon Monoxide

Astronomical

Sun
10h 11m daylight
Sunrise 6:39 AM
Solar Noon 11:44 AM
Sunset 4:50 PM
Moon
New • 2%
Moonrise 9:11 AM
Transit 1:41 PM
Moonset 6:10 PM

Best Times for Fishing or Hunting

Major Periods

12:45 AM - 3:15 AM
1:11 PM - 3:41 PM

Minor Periods

8:41 AM - 10:11 AM
5:40 PM - 7:10 PM
Action Rating:
Good Action 3/5
Thursday, November 12, 2026

Weather Forecast

Conditions: Overcast
Average Temperature: 45.5°F
Average Humidity: 60%
Chance of Rain: 1%
Wind: 17.9 mph
UV Index: 3.1

Air Quality

EPA Index 2 • Moderate
PM2.5
3.9 μg/m³
Good
PM10
4.2 μg/m³
Good
Ozone (O3)
47.5 μg/m³
Photochemical
NO2
7.1 μg/m³
Nitrogen Dioxide
SO2
1 μg/m³
Sulfur Dioxide
CO
137.4 μg/m³
Carbon Monoxide

Astronomical

Sun
10h 9m daylight
Sunrise 6:40 AM
Solar Noon 11:44 AM
Sunset 4:49 PM
Moon
Waxing Crescent • 6%
Moonrise 10:04 AM
Transit 2:32 PM
Moonset 7:02 PM

Best Times for Fishing or Hunting

Major Periods

1:37 AM - 4:07 AM
2:02 PM - 4:32 PM

Minor Periods

9:34 AM - 11:04 AM
6:32 PM - 8:02 PM
Action Rating:
Good Action 3/5
Friday, November 13, 2026

Weather Forecast

Conditions: Partly Cloudy
Average Temperature: 38.8°F
Average Humidity: 57%
Chance of Rain: 0%
Wind: 12.2 mph
UV Index: 3.5

Air Quality

EPA Index 1 • Good
PM2.5
2.1 μg/m³
Good
PM10
2.2 μg/m³
Good
Ozone (O3)
53.4 μg/m³
Photochemical
NO2
6.9 μg/m³
Nitrogen Dioxide
SO2
0.7 μg/m³
Sulfur Dioxide
CO
135.1 μg/m³
Carbon Monoxide

Astronomical

Sun
10h 7m daylight
Sunrise 6:41 AM
Solar Noon 11:44 AM
Sunset 4:48 PM
Moon
Waxing Crescent • 13%
Moonrise 10:51 AM
Transit 3:23 PM
Moonset 8:00 PM

Best Times for Fishing or Hunting

Major Periods

2:28 AM - 4:58 AM
2:53 PM - 5:23 PM

Minor Periods

10:21 AM - 11:51 AM
7:30 PM - 9:00 PM
Action Rating:
Fair Action 2/5
Saturday, November 14, 2026

Weather Forecast

Conditions: Sunny
Average Temperature: 37.4°F
Average Humidity: 56%
Chance of Rain: 0%
Wind: 6.8 mph
UV Index: 3.5

Air Quality

EPA Index 1 • Good
PM2.5
6.8 μg/m³
Good
PM10
6.9 μg/m³
Good
Ozone (O3)
35.2 μg/m³
Photochemical
NO2
20.3 μg/m³
Nitrogen Dioxide
SO2
2.3 μg/m³
Sulfur Dioxide
CO
192.3 μg/m³
Carbon Monoxide

Astronomical

Sun
10h 5m daylight
Sunrise 6:42 AM
Solar Noon 11:45 AM
Sunset 4:48 PM
Moon
Waxing Crescent • 21%
Moonrise 11:29 AM
Transit 4:12 PM
Moonset 9:00 PM

Best Times for Fishing or Hunting

Major Periods

3:18 AM - 5:48 AM
3:42 PM - 6:12 PM

Minor Periods

10:59 AM - 12:29 PM
8:30 PM - 10:00 PM
Action Rating:
Fair Action 2/5
The times presented here are based upon the solunar theory, which is the idea that the movements of fish and other animals are affected by the location of the sun and moon. The major periods are believed to be the times of the greatest animal activity and occur when the moon is directly overhead or underfoot (lunar transits). The minor periods also see increased activity and occur when the moon is rising or setting. The strongest activity occurs during full or new moons, and the weakest during quarter or three quarter moons. This is indicated by the Action Rating.

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