Water Temperature of the Mississippi River in Alton, IL

Current Water Temperature

32.0°F

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

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

72.5°F
Clear
Clear
76.6°F
75.8°F
72%
NNW 7.4 mph
15.3 mph
70.2°F
61.8°F
0 in
0%
9 mi
1014 mbar
0

Five Day Weather Forecast

Sunny
Wed
H: 80°F
L: 61°F
Sunny
Thu
H: 74°F
L: 56°F
Mist
Fri
H: 64°F
L: 62°F
Mist
Sat
H: 86°F
L: 63°F
Sunny
Sun
H: 95°F
L: 74°F

Air Quality

AQI: 1 - Good
PM2.5: 5.5 μg/m3
PM10: 5.5 μg/m3
Carbon Monoxide: 154 μg/m3
Nitrogen Dioxide: 6.8 μg/m3
Sulphur Dioxide: 0.9 μg/m3
Ozone: 62 μg/m3

Astronomical

Sunrise: 5:53 AM
Sun Transit: 1:07 PM
Sunset: 8:21 PM
Daylight: 14 hrs 28 mins
Moonrise: 2:58 PM
Moon Transit: 7:52 PM
Moonset: 12:12 AM
Moon Phase: First Quarter
Moon Illumination: 55.0%

Best Times for Fishing or Hunting

Major Periods

6:58 AM - 9:28 AM
7:22 PM - 9:52 PM

Minor Periods

2:28 PM - 3:58 PM
12:00 AM - 12:00 AM

Action Rating: 2 out of 5

Heat Advisory issued July 21 at 6:48PM CDT until July 21 at 7:00PM CDT by NWS St Louis MO

Effective: Tue July 21, 2026, 6:48 PM
Expires: Tue July 21, 2026, 8:00 PM

A cold front has crossed the region and therefore the heat advisory will be allowed to expire at 7 PM.
Wednesday, July 22, 2026

Weather Forecast

Sunny
80.1°F
61.4°F
70.4°F
74%
0.01 in
17%
0%
12.1 mph
9.4


Air Quality

AQI: 1 - Good
PM2.5: 5.4 μg/m3
PM10: 5.59 μg/m3
Carbon Monoxide: 148.63 μg/m3
Nitrogen Dioxide: 4.86 μg/m3
Sulphur Dioxide: 1.62 μg/m3
Ozone: 76.63 μg/m3

Astronomical

Sunrise: 5:53 AM
Sun Transit: 1:07 PM
Sunset: 8:21 PM
Daylight: 14 hrs 28 mins
Moonrise: 2:58 PM
Moon Transit: 7:52 PM
Moonset: 12:12 AM
Moon Phase: First Quarter
Moon Illumination: 55.0%

Best Times for Fishing or Hunting

Major Periods

6:58 AM - 9:28 AM
7:22 PM - 9:52 PM

Minor Periods

2:28 PM - 3:58 PM
12:00 AM - 12:00 AM

Action Rating: 2 out of 5

Thursday, July 23, 2026

Weather Forecast

Sunny
74.1°F
56.4°F
65.6°F
74%
0 in
7%
0%
8.9 mph
9.8


Air Quality

AQI: 1 - Good
PM2.5: 3.74 μg/m3
PM10: 3.91 μg/m3
Carbon Monoxide: 138.88 μg/m3
Nitrogen Dioxide: 7.43 μg/m3
Sulphur Dioxide: 1.55 μg/m3
Ozone: 79.54 μg/m3

Astronomical

Sunrise: 5:54 AM
Sun Transit: 1:07 PM
Sunset: 8:20 PM
Daylight: 14 hrs 26 mins
Moonrise: 4:00 PM
Moon Transit: 8:40 PM
Moonset: 12:42 AM
Moon Phase: First Quarter
Moon Illumination: 66.1%

Best Times for Fishing or Hunting

Major Periods

7:45 AM - 10:15 AM
8:10 PM - 10:40 PM

Minor Periods

3:30 PM - 5:00 PM
12:12 AM - 1:42 AM

Action Rating: 3 out of 5

Friday, July 24, 2026

Weather Forecast

Mist
64.4°F
61.6°F
62.9°F
90%
0.36 in
90%
0%
7.2 mph
1.3


Air Quality

AQI: 1 - Good
PM2.5: 6.58 μg/m3
PM10: 6.74 μg/m3
Carbon Monoxide: 165.92 μg/m3
Nitrogen Dioxide: 10.53 μg/m3
Sulphur Dioxide: 3.44 μg/m3
Ozone: 82.08 μg/m3

Astronomical

Sunrise: 5:55 AM
Sun Transit: 1:07 PM
Sunset: 8:19 PM
Daylight: 14 hrs 24 mins
Moonrise: 5:00 PM
Moon Transit: 9:30 PM
Moonset: 1:17 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 76.3%

Best Times for Fishing or Hunting

Major Periods

8:34 AM - 11:04 AM
9:00 PM - 11:30 PM

Minor Periods

4:30 PM - 6:00 PM
12:47 AM - 2:17 AM

Action Rating: 2 out of 5

Saturday, July 25, 2026

Weather Forecast

Mist
85.5°F
62.6°F
73.3°F
86%
0.03 in
55%
0%
9.8 mph
7


Air Quality

AQI: 1 - Good
PM2.5: 8.75 μg/m3
PM10: 9.23 μg/m3
Carbon Monoxide: 194.35 μg/m3
Nitrogen Dioxide: 8.36 μg/m3
Sulphur Dioxide: 3 μg/m3
Ozone: 97.5 μg/m3

Astronomical

Sunrise: 5:56 AM
Sun Transit: 1:07 PM
Sunset: 8:18 PM
Daylight: 14 hrs 23 mins
Moonrise: 5:55 PM
Moon Transit: 10:21 PM
Moonset: 1:59 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 85.2%

Best Times for Fishing or Hunting

Major Periods

9:25 AM - 11:55 AM
12:00 AM - 12:00 AM

Minor Periods

5:25 PM - 6:55 PM
1:29 AM - 2:59 AM

Action Rating: 2 out of 5

Sunday, July 26, 2026

Weather Forecast

Sunny
95.1°F
74.2°F
83.6°F
80%
0 in
9%
0%
11.6 mph
9


Air Quality

AQI: 1 - Good
PM2.5: 14.4 μg/m3
PM10: 14.64 μg/m3
Carbon Monoxide: 390.63 μg/m3
Nitrogen Dioxide: 34.2 μg/m3
Sulphur Dioxide: 2.71 μg/m3
Ozone: 20.63 μg/m3

Astronomical

Sunrise: 5:57 AM
Sun Transit: 1:07 PM
Sunset: 8:17 PM
Daylight: 14 hrs 21 mins
Moonrise: 6:45 PM
Moon Transit: 11:13 PM
Moonset: 2:49 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 92.3%

Best Times for Fishing or Hunting

Major Periods

10:16 AM - 12:46 AM
12:00 AM - 12:00 AM

Minor Periods

6:15 PM - 7:45 PM
2:19 AM - 3:49 AM

Action Rating: 2 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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