Water Temperature of the Mississippi River in Alton, IL

Current Water Temperature

32.6°F

Measurement Time: Wednesday, January 21, 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

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

36°F
Partly cloudy
Partly cloudy
26.6°F
35.5°F
47%
WNW 15 mph
26.2 mph
28.1°F
16.9°F
0 in
50%
9 mi
1020 mbar
0

Five Day Weather Forecast

Sunny
Wed
H: 51°F
L: 28°F
Sunny
Thu
H: 36°F
L: 19°F
Partly Cloudy
Fri
H: 19°F
L: 5°F
Moderate or heavy snow showers
Sat
H: 11°F
L: 3°F
Moderate or heavy snow showers
Sun
H: 22°F
L: 11°F

Air Quality

AQI: 1 - Good
PM2.5: 2.35 μg/m3
PM10: 2.45 μg/m3
Carbon Monoxide: 155.85 μg/m3
Nitrogen Dioxide: 4.15 μg/m3
Sulphur Dioxide: 1.95 μg/m3
Ozone: 70 μg/m3

Astronomical

Sunrise: 7:15 AM
Sun Transit: 12:11 AM
Sunset: 5:09 PM
Daylight: 9 hrs 55 mins
Moonrise: 8:57 AM
Moon Transit: 2:32 PM
Moonset: 8:18 PM
Moon Phase: Waxing Crescent
Moon Illumination: 8.1%

Best Times for Fishing or Hunting

Major Periods

1:38 AM - 4:08 AM
2:02 PM - 4:32 PM

Minor Periods

7:48 PM - 9:18 PM
8:27 AM - 9:57 AM

Action Rating: 2 out of 5

Winter Storm Watch issued January 21 at 1:25PM CST until January 25 at 12:00PM CST by NWS St Louis MO

Effective: Wed January 21, 2026, 1:25 PM
Expires: Thu January 22, 2026, 4:30 AM

* WHAT...Heavy snow possible. Total snow accumulations between 4 and 6 inches possible. * WHERE...Portions of south central and southwest Illinois and central, east central, and southeast Missouri. * WHEN...From late Friday night through Sunday morning. * IMPACTS...Travel could be very difficult. * ADDITIONAL DETAILS...Wind chills will drop below 0 degrees for most locations Friday and Saturday nights as well.

Monitor the latest forecasts for updates on this situation.
Wednesday, January 21, 2026

Weather Forecast

Sunny
51.4°F
28.4°F
38.4°F
43%
0 in
0%
0%
15.7 mph
0.4


Air Quality

AQI: 1 - Good
PM2.5: 7.25 μg/m3
PM10: 7.49 μg/m3
Carbon Monoxide: 207.13 μg/m3
Nitrogen Dioxide: 10.22 μg/m3
Sulphur Dioxide: 3.78 μg/m3
Ozone: 58.04 μg/m3

Astronomical

Sunrise: 7:15 AM
Sun Transit: 12:11 AM
Sunset: 5:09 PM
Daylight: 9 hrs 55 mins
Moonrise: 8:57 AM
Moon Transit: 2:32 PM
Moonset: 8:18 PM
Moon Phase: Waxing Crescent
Moon Illumination: 8.1%

Best Times for Fishing or Hunting

Major Periods

1:38 AM - 4:08 AM
2:02 PM - 4:32 PM

Minor Periods

7:48 PM - 9:18 PM
8:27 AM - 9:57 AM

Action Rating: 2 out of 5

Thursday, January 22, 2026

Weather Forecast

Sunny
35.8°F
18.9°F
28.8°F
47%
0 in
0%
0%
12.8 mph
0.3


Air Quality

AQI: 1 - Good
PM2.5: 5.02 μg/m3
PM10: 5.19 μg/m3
Carbon Monoxide: 188.41 μg/m3
Nitrogen Dioxide: 13.28 μg/m3
Sulphur Dioxide: 3.14 μg/m3
Ozone: 57.68 μg/m3

Astronomical

Sunrise: 7:14 AM
Sun Transit: 12:12 AM
Sunset: 5:11 PM
Daylight: 9 hrs 57 mins
Moonrise: 9:20 AM
Moon Transit: 12:00 AM
Moonset: 9:24 PM
Moon Phase: Waxing Crescent
Moon Illumination: 15.4%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
2:23 AM - 4:53 AM

Minor Periods

8:54 PM - 10:24 PM
8:50 AM - 10:20 AM

Action Rating: 2 out of 5

Friday, January 23, 2026

Weather Forecast

Partly Cloudy
19.2°F
5.4°F
15.7°F
31%
0 in
0%
0%
18.1 mph
0.4


Air Quality

AQI: 1 - Good
PM2.5: 7.7 μg/m3
PM10: 7.97 μg/m3
Carbon Monoxide: 260.57 μg/m3
Nitrogen Dioxide: 23.13 μg/m3
Sulphur Dioxide: 3.46 μg/m3
Ozone: 45.72 μg/m3

Astronomical

Sunrise: 7:13 AM
Sun Transit: 12:12 AM
Sunset: 5:12 PM
Daylight: 9 hrs 58 mins
Moonrise: 9:43 AM
Moon Transit: 8:54 AM
Moonset: 10:32 PM
Moon Phase: Waxing Crescent
Moon Illumination: 24.4%

Best Times for Fishing or Hunting

Major Periods

8:24 AM - 10:54 AM
8:24 AM - 10:54 AM

Minor Periods

10:02 PM - 11:32 PM
9:13 AM - 10:43 AM

Action Rating: 2 out of 5

Saturday, January 24, 2026

Weather Forecast

Moderate or heavy snow showers
10.8°F
3.4°F
7.3°F
43%
0.62 in
78%
18%
12.5 mph
0.2


Air Quality

AQI: 1 - Good
PM2.5: 3.2 μg/m3
PM10: 3.38 μg/m3
Carbon Monoxide: 167.74 μg/m3
Nitrogen Dioxide: 6.71 μg/m3
Sulphur Dioxide: 2.45 μg/m3
Ozone: 54.88 μg/m3

Astronomical

Sunrise: 7:13 AM
Sun Transit: 12:12 AM
Sunset: 5:13 PM
Daylight: 10 hrs mins
Moonrise: 10:08 AM
Moon Transit: 4:48 PM
Moonset: 11:41 PM
Moon Phase: First Quarter
Moon Illumination: 34.7%

Best Times for Fishing or Hunting

Major Periods

3:53 AM - 6:23 AM
4:18 PM - 6:48 PM

Minor Periods

12:00 AM - 12:00 AM
9:38 AM - 11:08 AM

Action Rating: 2 out of 5

Sunday, January 25, 2026

Weather Forecast

Moderate or heavy snow showers
22.2°F
10.8°F
15.9°F
78%
0.34 in
74%
11%
7.6 mph
0.3


Air Quality

AQI: 1 - Good
PM2.5: 5.47 μg/m3
PM10: 5.63 μg/m3
Carbon Monoxide: 199 μg/m3
Nitrogen Dioxide: 8.85 μg/m3
Sulphur Dioxide: 2.48 μg/m3
Ozone: 50.69 μg/m3

Astronomical

Sunrise: 7:12 AM
Sun Transit: 12:12 AM
Sunset: 5:14 PM
Daylight: 10 hrs 2 mins
Moonrise: 10:35 AM
Moon Transit: 5:37 PM
Moonset: 12:41 AM
Moon Phase: First Quarter
Moon Illumination: 45.8%

Best Times for Fishing or Hunting

Major Periods

4:41 AM - 7:11 AM
5:07 PM - 7:37 PM

Minor Periods

10:05 AM - 11:35 AM
12:00 AM - 12:00 AM

Action Rating: 4 out of 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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