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°F
Partly cloudy
Partly cloudy
76.3°F
68.1°F
61%
WNW 7.4 mph
9.4 mph
67°F
60.8°F
0 in
75%
9 mi
1008 mbar
3.4

Five Day Weather Forecast

Heavy rain
Fri
H: 71°F
L: 60°F
Sunny
Sat
H: 73°F
L: 52°F
Sunny
Sun
H: 72°F
L: 50°F
Moderate rain
Mon
H: 81°F
L: 58°F
Sunny
Tue
H: 66°F
L: 48°F

Air Quality

AQI: 1 - Good
PM2.5: 10.85 μg/m3
PM10: 11.45 μg/m3
Carbon Monoxide: 209.85 μg/m3
Nitrogen Dioxide: 39.85 μg/m3
Sulphur Dioxide: 3.25 μg/m3
Ozone: 54 μg/m3

Astronomical

Sunrise: 6:12 AM
Sun Transit: 12:58 AM
Sunset: 7:46 PM
Daylight: 13 hrs 35 mins
Moonrise: 12:49 AM
Moon Transit: 8:07 PM
Moonset: 2:43 AM
Moon Phase: First Quarter
Moon Illumination: 50.4%

Best Times for Fishing or Hunting

Major Periods

7:10 AM - 9:40 AM
7:37 PM - 10:07 PM

Minor Periods

12:19 AM - 1:49 PM
2:13 AM - 3:43 AM

Action Rating: 3 out of 5

Flood Warning issued April 23 at 9:09PM CDT by NWS St Louis MO

Effective: Thu April 23, 2026, 9:09 PM
Expires: Sat April 25, 2026, 9:15 AM

...The Flood Warning continues for the following rivers in Missouri...Illinois... Mississippi River at Grafton. Mississippi River at Canton. Illinois River at Hardin. Mississippi River at Saverton. Mississippi River at Winfield. Mississippi River at Hannibal. Mississippi River at Clarksville. Mississippi River at Louisiana. ...The Flood Warning is cancelled for the following rivers in Missouri...Illinois... Mississippi River at Chester. River forecasts are based on observed precipitation and forecast precipitation for the next 24 hours. * WHAT...Minor flooding is occurring and minor flooding is forecast. * WHERE...Illinois River at Hardin. * WHEN...Until further notice. * IMPACTS...At 25.0 feet, Flood Stage. Lowland flooding of unprotected agricultural land begins. * ADDITIONAL DETAILS... - At 8:30 PM CDT Thursday the stage was 26.4 feet. - Recent Activity...The maximum river stage in the 24 hours ending at 8:30 PM CDT Thursday was 26.5 feet. - Forecast...The river is expected to rise to a crest of 26.4 feet just after midnight tonight. - Flood stage is 25.0 feet.

Motorists should not attempt to drive around barricades or drive cars through flooded areas. This product, along with additional weather and stream information, is available at https://water.noaa.gov/wfo/lsx


Flood Warning issued April 23 at 9:09PM CDT until April 30 at 7:00PM CDT by NWS St Louis MO

Effective: Thu April 23, 2026, 9:09 PM
Expires: Sat April 25, 2026, 9:15 AM

...The Flood Warning continues for the following rivers in Missouri...Illinois... Mississippi River at Grafton. Mississippi River at Canton. Illinois River at Hardin. Mississippi River at Saverton. Mississippi River at Winfield. Mississippi River at Hannibal. Mississippi River at Clarksville. Mississippi River at Louisiana. ...The Flood Warning is cancelled for the following rivers in Missouri...Illinois... Mississippi River at Chester. River forecasts are based on observed precipitation and forecast precipitation for the next 24 hours. * WHAT...Minor flooding is occurring and minor flooding is forecast. * WHERE...Mississippi River at Grafton. * WHEN...Until Thursday evening. * IMPACTS...At 21.0 feet, Water begins flooding the floor at the Palisades Marina in Portage Des Sioux. Access to homes along North Shore Drive in eastern St. Charles County becomes cut off near this height. * ADDITIONAL DETAILS... - At 8:30 PM CDT Thursday the stage was 20.6 feet. - Recent Activity...The maximum river stage in the 24 hours ending at 8:30 PM CDT Thursday was 20.8 feet. - Forecast...The river is expected to fall below flood stage early Wednesday afternoon and continue falling to 19.7 feet Thursday, April 30. - Flood stage is 20.0 feet.

Motorists should not attempt to drive around barricades or drive cars through flooded areas. This product, along with additional weather and stream information, is available at https://water.noaa.gov/wfo/lsx


Flood Warning issued April 24 at 11:29AM CDT until April 30 at 1:00PM CDT by NWS St Louis MO

Effective: Fri April 24, 2026, 11:29 AM
Expires: Sat April 25, 2026, 11:30 PM

...The Flood Warning continues for the Mississippi River at the following locations... Mississippi River at Grafton. Mississippi River at Saverton. Mississippi River at Winfield. Mississippi River at Hannibal. Mississippi River at Clarksville. Mississippi River at Louisiana. Mississippi River at Canton. River forecasts are based on observed precipitation and forecast precipitation for the next 24 hours. * WHAT...Minor flooding is occurring and minor flooding is forecast. * WHERE...Mississippi River at Grafton. * WHEN...Until Thursday afternoon. * IMPACTS...At 21.0 feet, Water begins flooding the floor at the Palisades Marina in Portage Des Sioux. Access to homes along North Shore Drive in eastern St. Charles County becomes cut off near this height. * ADDITIONAL DETAILS... - At 11:00 AM CDT Friday the stage was 20.6 feet. - Forecast...The river is expected to rise to a crest of 20.6 feet this afternoon. It will then fall below flood stage Wednesday morning. - Flood stage is 20.0 feet.

Motorists should not attempt to drive around barricades or drive cars through flooded areas. This product, along with additional weather and stream information, is available at https://water.noaa.gov/wfo/lsx


Flood Warning issued April 24 at 11:23AM CDT by NWS St Louis MO

Effective: Fri April 24, 2026, 11:23 AM
Expires: Sat April 25, 2026, 11:30 PM

...The Flood Warning continues for the following rivers in Illinois... Illinois River at Hardin. River forecasts are based on observed precipitation and forecast precipitation for the next 24 hours. * WHAT...Minor flooding is occurring and minor flooding is forecast. * WHERE...Illinois River at Hardin. * WHEN...Until further notice. * IMPACTS...At 25.0 feet, Flood Stage. Lowland flooding of unprotected agricultural land begins. * ADDITIONAL DETAILS... - At 11:00 AM CDT Friday the stage was 26.4 feet. - Forecast...The river is expected to rise to a crest of 26.4 feet this afternoon. - Flood stage is 25.0 feet.

Motorists should not attempt to drive around barricades or drive cars through flooded areas. This product, along with additional weather and stream information, is available at https://water.noaa.gov/wfo/lsx


Flood Warning issued April 23 at 9:09PM CDT by NWS St Louis MO

Effective: Thu April 23, 2026, 9:09 PM
Expires: Sat April 25, 2026, 9:15 AM

...The Flood Warning continues for the following rivers in Missouri...Illinois... Mississippi River at Grafton. Mississippi River at Canton. Illinois River at Hardin. Mississippi River at Saverton. Mississippi River at Winfield. Mississippi River at Hannibal. Mississippi River at Clarksville. Mississippi River at Louisiana. ...The Flood Warning is cancelled for the following rivers in Missouri...Illinois... Mississippi River at Chester. River forecasts are based on observed precipitation and forecast precipitation for the next 24 hours. * WHAT...Minor flooding is occurring and minor flooding is forecast. * WHERE...Mississippi River at Winfield. * WHEN...Until further notice. * IMPACTS...At 28.3 feet, Near this height, Lakeview Drive becomes impassable and Kampville Road begins flooding in northern St. Charles County. * ADDITIONAL DETAILS... - At 8:30 PM CDT Thursday the stage was 28.3 feet. - Recent Activity...The maximum river stage in the 24 hours ending at 8:30 PM CDT Thursday was 28.4 feet. - Forecast...The river is expected to rise to a crest of 28.3 feet just after midnight tonight. - Flood stage is 26.0 feet.

Motorists should not attempt to drive around barricades or drive cars through flooded areas. This product, along with additional weather and stream information, is available at https://water.noaa.gov/wfo/lsx
Friday, April 24, 2026

Weather Forecast

Heavy rain
70.5°F
59.5°F
65.2°F
84%
0.86 in
89%
0%
16.1 mph
5.4


Air Quality

AQI: 1 - Good
PM2.5: 5.07 μg/m3
PM10: 5.45 μg/m3
Carbon Monoxide: 172.13 μg/m3
Nitrogen Dioxide: 6.83 μg/m3
Sulphur Dioxide: 2.89 μg/m3
Ozone: 93.44 μg/m3

Astronomical

Sunrise: 6:12 AM
Sun Transit: 12:58 AM
Sunset: 7:46 PM
Daylight: 13 hrs 35 mins
Moonrise: 12:49 AM
Moon Transit: 8:07 PM
Moonset: 2:43 AM
Moon Phase: First Quarter
Moon Illumination: 50.4%

Best Times for Fishing or Hunting

Major Periods

7:10 AM - 9:40 AM
7:37 PM - 10:07 PM

Minor Periods

12:19 AM - 1:49 PM
2:13 AM - 3:43 AM

Action Rating: 3 out of 5

Saturday, April 25, 2026

Weather Forecast

Sunny
73.3°F
52.2°F
62.3°F
68%
0 in
0%
0%
9.4 mph
7


Air Quality

AQI: 1 - Good
PM2.5: 6.85 μg/m3
PM10: 7.28 μg/m3
Carbon Monoxide: 189.81 μg/m3
Nitrogen Dioxide: 21.65 μg/m3
Sulphur Dioxide: 2.61 μg/m3
Ozone: 69.36 μg/m3

Astronomical

Sunrise: 6:10 AM
Sun Transit: 12:58 AM
Sunset: 7:47 PM
Daylight: 13 hrs 37 mins
Moonrise: 1:58 PM
Moon Transit: 8:55 PM
Moonset: 3:14 AM
Moon Phase: First Quarter
Moon Illumination: 61.6%

Best Times for Fishing or Hunting

Major Periods

8:00 AM - 10:30 AM
8:25 PM - 10:55 PM

Minor Periods

1:28 PM - 2:58 PM
2:44 AM - 4:14 AM

Action Rating: 2 out of 5

Sunday, April 26, 2026

Weather Forecast

Sunny
72.1°F
50.2°F
60.9°F
73%
0 in
0%
0%
11.6 mph
7.5


Air Quality

AQI: 1 - Good
PM2.5: 4.17 μg/m3
PM10: 4.46 μg/m3
Carbon Monoxide: 193.65 μg/m3
Nitrogen Dioxide: 6.4 μg/m3
Sulphur Dioxide: 3.72 μg/m3
Ozone: 96.68 μg/m3

Astronomical

Sunrise: 6:09 AM
Sun Transit: 12:58 AM
Sunset: 7:48 PM
Daylight: 13 hrs 39 mins
Moonrise: 3:05 PM
Moon Transit: 9:39 PM
Moonset: 3:40 AM
Moon Phase: First Quarter
Moon Illumination: 72.3%

Best Times for Fishing or Hunting

Major Periods

8:46 AM - 11:16 AM
9:09 PM - 11:39 PM

Minor Periods

2:35 PM - 4:05 PM
3:10 AM - 4:40 AM

Action Rating: 2 out of 5

Monday, April 27, 2026

Weather Forecast

Moderate rain
80.9°F
57.6°F
67.7°F
76%
0.36 in
84%
0%
26.2 mph
7.6


Air Quality

AQI: 1 - Good
PM2.5: 6.61 μg/m3
PM10: 7.07 μg/m3
Carbon Monoxide: 174.12 μg/m3
Nitrogen Dioxide: 5.45 μg/m3
Sulphur Dioxide: 4.34 μg/m3
Ozone: 98.32 μg/m3

Astronomical

Sunrise: 6:08 AM
Sun Transit: 12:58 AM
Sunset: 7:49 PM
Daylight: 13 hrs 42 mins
Moonrise: 4:09 PM
Moon Transit: 10:22 PM
Moonset: 4:04 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 81.8%

Best Times for Fishing or Hunting

Major Periods

9:30 AM - 12:00 AM
12:00 AM - 12:00 AM

Minor Periods

3:39 PM - 5:09 PM
3:34 AM - 5:04 AM

Action Rating: 2 out of 5

Tuesday, April 28, 2026

Weather Forecast

Sunny
65.7°F
47.7°F
56.9°F
72%
0 in
0%
0%
13.2 mph
8


Air Quality

AQI: 1 - Good
PM2.5: 6.46 μg/m3
PM10: 7.06 μg/m3
Carbon Monoxide: 192.5 μg/m3
Nitrogen Dioxide: 11.17 μg/m3
Sulphur Dioxide: 2.25 μg/m3
Ozone: 60.38 μg/m3

Astronomical

Sunrise: 6:06 AM
Sun Transit: 12:58 AM
Sunset: 7:50 PM
Daylight: 13 hrs 44 mins
Moonrise: 5:11 PM
Moon Transit: 11:04 PM
Moonset: 4:26 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 89.6%

Best Times for Fishing or Hunting

Major Periods

10:12 AM - 12:42 AM
12:00 AM - 12:00 AM

Minor Periods

4:41 PM - 6:11 PM
3:56 AM - 5:26 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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