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

39.9°F
Fog
Fog
35.6°F
38.8°F
96%
SW 6 mph
12.7 mph
37.7°F
38.4°F
0 in
0%
6 mi
1018 mbar
0

Five Day Weather Forecast

Fog
Mon
H: 62°F
L: 35°F
Overcast
Tue
H: 52°F
L: 38°F
Cloudy
Wed
H: 71°F
L: 51°F
Sunny
Thu
H: 72°F
L: 48°F
Partly Cloudy
Fri
H: 44°F
L: 38°F

Air Quality

PM2.5: 18.15 μg/m3
PM10: 18.35 μg/m3
Carbon Monoxide: 314.85 μg/m3
Nitrogen Dioxide: 39.95 μg/m3
Sulphur Dioxide: 4.15 μg/m3
Ozone: 18 μg/m3

Astronomical

Sunrise: 6:51 AM
Sun Transit: 12:14 AM
Sunset: 5:39 PM
Daylight: 10 hrs 49 mins
Moonrise: 6:33 AM
Moon Transit: 11:41 AM
Moonset: 4:58 PM
Moon Phase: New
Moon Illumination: 0.9%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
11:11 AM - 1:41 PM

Minor Periods

4:28 PM - 5:58 PM
6:03 AM - 7:33 AM

Action Rating: 4 out of 5

Dense Fog Advisory issued February 15 at 6:31PM CST until February 16 at 9:00AM CST by NWS St Louis MO

Effective: Sun February 15, 2026, 6:31 PM
Expires: Mon February 16, 2026, 9:00 AM

* WHAT...Visibility one quarter to one half mile in dense fog. * WHERE...Portions of south central and southwest Illinois and east central and southeast Missouri. * WHEN...From 11 PM this evening to 9 AM CST Monday. * IMPACTS...Low visibility could make driving conditions hazardous.

If driving, slow down, use your headlights, and leave plenty of distance ahead of you.
Monday, February 16, 2026

Weather Forecast

Fog
61.7°F
35.4°F
45.3°F
88%
0 in
0%
0%
12.5 mph
0.6


Air Quality

AQI: 2 - Moderate
PM2.5: 15.95 μg/m3
PM10: 16.37 μg/m3
Carbon Monoxide: 369.65 μg/m3
Nitrogen Dioxide: 35.15 μg/m3
Sulphur Dioxide: 4.5 μg/m3
Ozone: 38.76 μg/m3

Astronomical

Sunrise: 6:51 AM
Sun Transit: 12:14 AM
Sunset: 5:39 PM
Daylight: 10 hrs 49 mins
Moonrise: 6:33 AM
Moon Transit: 11:41 AM
Moonset: 4:58 PM
Moon Phase: New
Moon Illumination: 0.9%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
11:11 AM - 1:41 PM

Minor Periods

4:28 PM - 5:58 PM
6:03 AM - 7:33 AM

Action Rating: 4 out of 5

Tuesday, February 17, 2026

Weather Forecast

Overcast
52.3°F
38.1°F
45°F
96%
0 in
0%
0%
20.1 mph
0.5


Air Quality

AQI: 1 - Good
PM2.5: 9.15 μg/m3
PM10: 9.28 μg/m3
Carbon Monoxide: 254.17 μg/m3
Nitrogen Dioxide: 11.81 μg/m3
Sulphur Dioxide: 5.13 μg/m3
Ozone: 65.88 μg/m3

Astronomical

Sunrise: 6:49 AM
Sun Transit: 12:14 AM
Sunset: 5:40 PM
Daylight: 10 hrs 51 mins
Moonrise: 7:00 AM
Moon Transit: 12:27 AM
Moonset: 6:06 PM
Moon Phase: New
Moon Illumination: 0.0%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
11:57 AM - 2:27 PM

Minor Periods

5:36 PM - 7:06 PM
6:30 AM - 8:00 AM

Action Rating: 5 out of 5

Wednesday, February 18, 2026

Weather Forecast

Cloudy
71.1°F
50.9°F
58.1°F
75%
0 in
0%
0%
18.3 mph
0.8


Air Quality

AQI: 1 - Good
PM2.5: 5.07 μg/m3
PM10: 5.22 μg/m3
Carbon Monoxide: 178.69 μg/m3
Nitrogen Dioxide: 6.21 μg/m3
Sulphur Dioxide: 2.92 μg/m3
Ozone: 89.72 μg/m3

Astronomical

Sunrise: 6:48 AM
Sun Transit: 12:14 AM
Sunset: 5:41 PM
Daylight: 10 hrs 53 mins
Moonrise: 7:24 AM
Moon Transit: 1:13 PM
Moonset: 7:13 PM
Moon Phase: New
Moon Illumination: 1.3%

Best Times for Fishing or Hunting

Major Periods

12:19 AM - 2:49 AM
12:43 AM - 3:13 PM

Minor Periods

6:43 PM - 8:13 PM
6:54 AM - 8:24 AM

Action Rating: 4 out of 5

Thursday, February 19, 2026

Weather Forecast

Sunny
72.4°F
47.9°F
58°F
52%
0 in
0%
0%
19 mph
0


Air Quality

AQI: 1 - Good
PM2.5: 7.55 μg/m3
PM10: 7.97 μg/m3
Carbon Monoxide: 251.56 μg/m3
Nitrogen Dioxide: 21.17 μg/m3
Sulphur Dioxide: 3.2 μg/m3
Ozone: 49.15 μg/m3

Astronomical

Sunrise: 6:47 AM
Sun Transit: 12:14 AM
Sunset: 5:43 PM
Daylight: 10 hrs 56 mins
Moonrise: 7:48 AM
Moon Transit: 2:00 PM
Moonset: 8:22 PM
Moon Phase: Waxing Crescent
Moon Illumination: 5.2%

Best Times for Fishing or Hunting

Major Periods

1:05 AM - 3:35 AM
1:30 PM - 4:00 PM

Minor Periods

7:52 PM - 9:22 PM
7:18 AM - 8:48 AM

Action Rating: 2 out of 5

Friday, February 20, 2026

Weather Forecast

Partly Cloudy
44.1°F
37.8°F
42.1°F
54%
0 in
0%
0%
19.7 mph
3


Air Quality

AQI: 0 -
PM2.5: 0 μg/m3
PM10: 0 μg/m3
Carbon Monoxide: 0 μg/m3
Nitrogen Dioxide: 0 μg/m3
Sulphur Dioxide: 0 μg/m3
Ozone: 0 μg/m3

Astronomical

Sunrise: 6:45 AM
Sun Transit: 12:14 AM
Sunset: 5:44 PM
Daylight: 10 hrs 58 mins
Moonrise: 8:12 AM
Moon Transit: 2:45 PM
Moonset: 9:32 PM
Moon Phase: Waxing Crescent
Moon Illumination: 11.3%

Best Times for Fishing or Hunting

Major Periods

1:51 AM - 4:21 AM
2:15 PM - 4:45 PM

Minor Periods

9:02 PM - 10:32 PM
7:42 AM - 9:12 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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