Mississippi River at Mel Price (Alton) Lock and Dam
2.6 mi- Level
- 7.8 ft
- Flow
- 125,000 cfs
Forecast peak 7.8 ft Fri 7 PM
Reading from Fri 5:30 PM · NWS gauge page
Observed 4:45 PM CDT at KALN
Alton, IL weather
Sunny and 73°23°, 10°6° warmer than a typical Oct 23.
Today: low 48°9° (likely 47°8° to 49°9°), high 75°24° (likely 73°23° to 76°24°).
Now 73°23°
Sunny
- Wind
- 7 mph11 km/h
- From the east-southeast. Up to 7 mph11 km/h through 6 AM
- Dew point
- 46°8°
- Comfortable
- UV tomorrow
- 4Moderate
- Moderate 11 AM–4 PM · peak 4
- Air quality
- 90Moderate
- Main pollutant: Ozone
Next 2 hours
No precipitation expected in the next 2 hours.
From forecast models
Next 48 hours
Good hours for
TonightDown to 49°9° by 5 AM · Clear
Tomorrow morningUp to 65°18° by 11 AM · Partly cloudy
Tomorrow afternoonUp to 75°24° by 4 PM · Mostly cloudy
Tomorrow nightDown to 50°10° by 5 AM · Partly cloudy
Sunday morningUp to 67°19° by 11 AM · Mostly cloudy
Sunday afternoonUp to 78°26° by 4 PM · Mostly cloudy
| Hour | Conditions | Temperature | Feels like | Precipitation | Wind | Humidity | Cloud cover | UV index |
|---|---|---|---|---|---|---|---|---|
| Fri 6p | Clear | 71°22° (likely 66°19° to 71°22°) | 71°22° | 0% | 5 mph8 km/h from SE, gusts 10 mph16 km/h | 41% | 0% | 0 |
| Fri 7p | Clear | 65°18° (likely 62°17° to 65°18°) | 65°18° | 0% | 6 mph10 km/h from E, gusts 8 mph14 km/h | 52% | 0% | 0 |
| Fri 8p | Clear | 61°16° (likely 59°15° to 62°17°) | 61°16° | 0% | 5 mph8 km/h from E, gusts 8 mph12 km/h | 62% | 2% | 0 |
| Fri 9p | Clear | 59°15° (likely 58°14° to 60°16°) | 59°15° | 0% | 5 mph8 km/h from E, gusts 7 mph12 km/h | 67% | 4% | 0 |
| Fri 10p | Clear | 57°14° (likely 56°13° to 59°15°) | 57°14° | 0% | 5 mph8 km/h from SE, gusts 10 mph17 km/h | 72% | 6% | 0 |
| Fri 11p | Mostly clear | 56°13° (likely 54°12° to 58°14°) | 56°13° | 0% | 5 mph8 km/h from SE, gusts 8 mph13 km/h | 74% | 11% | 0 |
| Sat 12a | Mostly clear | 54°12° (likely 53°12° to 57°14°) | 54°12° | 0% | 3 mph5 km/h from SE, gusts 6 mph10 km/h | 77% | 20% | 0 |
| Sat 1a | Mostly clear | 53°12° (likely 52°11° to 56°13°) | 53°12° | 0% | 3 mph5 km/h from SE, gusts 8 mph13 km/h | 80% | 24% | 0 |
| Sat 2a | Partly cloudy | 52°11° (likely 51°11° to 54°12°) | 52°11° | 0% | 3 mph5 km/h from E, gusts 8 mph12 km/h | 83% | 23% | 0 |
| Sat 3a | Partly cloudy | 51°11° (likely 49°9° to 53°12°) | 51°11° | 0% | 2 mph3 km/h from E, gusts 6 mph10 km/h | 86% | 33% | 0 |
| Sat 4a | Clear | 50°10° (likely 48°9° to 53°12°) | 50°10° | 0% | 2 mph3 km/h from E, gusts 6 mph9 km/h | 86% | 19% | 0 |
| Sat 5a | Cloudy | 49°9° (likely 47°8° to 52°11°) | 49°9° | 0% | 2 mph3 km/h from E, gusts 4 mph7 km/h | 89% | 57% | 0 |
| Sat 6a | Cloudy | 48°9° (likely 46°8° to 51°11°) | 47°8° | 0% | 3 mph5 km/h from E, gusts 4 mph6 km/h | 93% | 59% | 0 |
| Sat 7a | Cloudy | 48°9° (likely 45°7° to 51°11°) | 47°8° | 0% | 3 mph5 km/h from E, gusts 5 mph8 km/h | 93% | 63% | 0 |
| Sat 8a | Partly sunny | 49°9° (likely 46°8° to 52°11°) | 48°9° | 0% | 3 mph5 km/h from E, gusts 6 mph10 km/h | 89% | 61% | 0 |
| Sat 9a | Partly sunny | 55°13° (likely 52°11° to 56°13°) | 55°13° | 0% | 5 mph8 km/h from SE, gusts 7 mph11 km/h | 80% | 52% | 1 |
| Sat 10a | Partly sunny | 61°16° (likely 59°15° to 61°16°) | 61°16° | 0% | 5 mph8 km/h from SE, gusts 8 mph14 km/h | 65% | 50% | 2 |
| Sat 11a | Cloudy | 65°18° (likely 64°18° to 67°19°) | 65°18° | 0% | 6 mph10 km/h from SE, gusts 10 mph16 km/h | 56% | 65% | 3 |
| Sat 12p | Partly sunny | 69°21° (likely 67°19° to 71°22°) | 69°21° | 0% | 6 mph10 km/h from SE, gusts 8 mph13 km/h | 47% | 66% | 4 |
| Sat 1p | Cloudy | 72°22° (likely 70°21° to 74°23°) | 72°22° | 0% | 6 mph10 km/h from SE, gusts 7 mph12 km/h | 39% | 80% | 4 |
| Sat 2p | Partly sunny | 74°23° (likely 72°22° to 75°24°) | 74°23° | 0% | 6 mph10 km/h from SE, gusts 7 mph11 km/h | 37% | 71% | 4 |
| Sat 3p | Cloudy | 74°23° (likely 72°22° to 76°24°) | 74°23° | 0% | 6 mph10 km/h from SE, gusts 7 mph11 km/h | 35% | 64% | 3 |
| Sat 4p | Cloudy | 75°24° (likely 72°22° to 76°24°) | 75°24° | 0% | 6 mph10 km/h from SE, gusts 7 mph11 km/h | 34% | 55% | 2 |
| Sat 5p | Partly sunny | 73°23° (likely 69°21° to 75°24°) | 73°23° | 0% | 5 mph8 km/h from SE, gusts 8 mph12 km/h | 37% | 37% | 1 |
| Sat 6p | Partly cloudy | 70°21° (likely 65°18° to 70°21°) | 70°21° | 0% | 5 mph8 km/h from SE, gusts 8 mph13 km/h | 42% | 49% | 0 |
| Sat 7p | Clear | 66°19° (likely 61°16° to 66°19°) | 66°19° | 0% | 5 mph8 km/h from E, gusts 8 mph13 km/h | 50% | 41% | 0 |
| Sat 8p | Partly cloudy | 60°16° (likely 58°14° to 62°17°) | 60°16° | 0% | 3 mph5 km/h from E, gusts 7 mph12 km/h | 62% | 44% | 0 |
| Sat 9p | Partly cloudy | 58°14° (likely 56°13° to 60°16°) | 58°14° | 0% | 3 mph5 km/h from SE, gusts 9 mph15 km/h | 67% | 48% | 0 |
| Sat 10p | Partly cloudy | 56°13° (likely 55°13° to 59°15°) | 56°13° | 0% | 3 mph5 km/h from SE, gusts 9 mph15 km/h | 72% | 51% | 0 |
| Sat 11p | Partly cloudy | 56°13° (likely 54°12° to 58°14°) | 56°13° | 0% | 2 mph3 km/h from SE, gusts 9 mph15 km/h | 72% | 52% | 0 |
| Sun 12a | Partly cloudy | 55°13° (likely 52°11° to 57°14°) | 55°13° | 0% | 2 mph3 km/h from SE, gusts 7 mph11 km/h | 74% | 50% | 0 |
| Sun 1a | Partly cloudy | 54°12° (likely 51°11° to 55°13°) | 54°12° | 0% | 2 mph3 km/h from SE, gusts 6 mph9 km/h | 74% | 52% | 0 |
| Sun 2a | Clear | 53°12° (likely 50°10° to 54°12°) | 53°12° | 0% | 2 mph3 km/h from SE, gusts 5 mph8 km/h | 77% | 15% | 0 |
| Sun 3a | Partly cloudy | 52°11° (likely 49°9° to 53°12°) | 52°11° | 0% | 2 mph3 km/h from SE, gusts 5 mph7 km/h | 80% | 44% | 0 |
| Sun 4a | Partly cloudy | 51°11° (likely 48°9° to 53°12°) | 51°11° | 0% | 2 mph3 km/h from SE, gusts 4 mph7 km/h | 83% | 49% | 0 |
| Sun 5a | Partly cloudy | 50°10° (likely 48°9° to 52°11°) | 50°10° | 0% | 2 mph3 km/h from SE, gusts 4 mph7 km/h | 83% | 48% | 0 |
| Sun 6a | Partly cloudy | 50°10° (likely 47°8° to 51°11°) | 50°10° | 0% | 2 mph3 km/h from SE, gusts 4 mph7 km/h | 83% | 56% | 0 |
| Sun 7a | Partly sunny | 49°9° (likely 46°8° to 51°11°) | 49°9° | 0% | 1 mph2 km/h from SE, gusts 4 mph6 km/h | 86% | 59% | 0 |
| Sun 8a | Partly sunny | 51°11° (likely 46°8° to 51°11°) | 51°11° | 0% | 2 mph3 km/h from SE, gusts 5 mph8 km/h | 83% | 69% | 0 |
| Sun 9a | Cloudy | 56°13° (likely 52°11° to 56°13°) | 56°13° | 0% | 3 mph5 km/h from SE, gusts 4 mph7 km/h | 74% | 73% | 1 |
| Sun 10a | Cloudy | 63°17° (likely 60°16° to 63°17°) | 63°17° | 0% | 3 mph5 km/h from S, gusts 7 mph12 km/h | 60% | 80% | 2 |
| Sun 11a | Cloudy | 67°19° (likely 65°18° to 69°21°) | 67°19° | 0% | 3 mph5 km/h from S, gusts 7 mph12 km/h | 52% | 80% | 3 |
| Sun 12p | Cloudy | 71°22° (likely 70°21° to 74°23°) | 71°22° | 0% | 5 mph8 km/h from S, gusts 7 mph11 km/h | 46% | 78% | 4 |
| Sun 1p | Cloudy | 75°24° (likely 73°23° to 76°24°) | 75°24° | 0% | 5 mph8 km/h from S, gusts 6 mph9 km/h | 38% | 75% | 4 |
| Sun 2p | Mostly cloudy | 76°24° (likely 73°23° to 77°25°) | 76°24° | 0% | 5 mph8 km/h from S, gusts 5 mph9 km/h | 36% | 69% | 4 |
| Sun 3p | Cloudy | 77°25° (likely 73°23° to 77°25°) | 77°25° | 0% | 3 mph5 km/h from S, gusts 5 mph8 km/h | 35% | 86% | 3 |
| Sun 4p | Cloudy | 78°26° (likely 72°22° to 78°26°) | 78°26° | 0% | 3 mph5 km/h from S, gusts 5 mph9 km/h | 34% | 91% | 2 |
| Sun 5p | Cloudy | 75°24° (likely 70°21° to 75°24°) | 75°24° | 0% | 3 mph5 km/h from S, gusts 5 mph8 km/h | 38% | 96% | 1 |
Days ahead
Shaded: typical range for these dates (1991–2020)
Today, Oct 23. Mostly sunny. High 75°24°, low 48°9°. Typical 65°18° / 45°7°. Dry. Forecasts agree. Best day outdoors this week.
Evening
6 PM–midnight
Clear, 61°16°Dry
Overnight
midnight–6 AM
Partly cloudy, 49°9°Dry
Official NWS forecast
Tonight: Mostly clear, with a low around 48. Southeast wind 2 to 6 mph.
Forecasts agreeIndependent forecasts are close; the range is narrow.
Best day outdoors this week: the one dry, mild day the forecasts agree on (high 75°24°).
- High, likely
- 73°23°–76°24°
- Low, likely
- 47°8°–49°9°
- Typical high / low
- 65°18° / 45°7°
- Wind
- 7 mph11 km/h, gusts 15 mph24 km/h
- UV peak
- 5
Tomorrow, Oct 24. Cloudy. High 76°24°, low 49°9°. Typical 64°18° / 45°7°. Dry. Mostly agree.
Morning
6 AM–noon
Partly sunny, 49°9°Dry
Afternoon
noon–6 PM
Cloudy, 75°24°Dry
Evening
6 PM–midnight
Partly cloudy, 60°16°Dry
Overnight
midnight–6 AM
Partly cloudy, 50°10°Dry
Official NWS forecast
Day: Patchy fog before 8am. Mostly sunny, with a high near 76. Southeast wind around 6 mph.
Night: Partly cloudy, with a low around 49. Southeast wind around 5 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
- High, likely
- 72°22°–76°24°
- Low, likely
- 45°7°–51°11°
- Typical high / low
- 64°18° / 45°7°
- Wind
- 6 mph10 km/h, gusts 14 mph22 km/h
- UV peak
- 4
Sunday, Oct 25. Cloudy. High 78°26°, low 52°11°. Typical 64°18° / 44°7°. Dry. Mostly agree.
Morning
6 AM–noon
Cloudy, 51°11°Dry
Afternoon
noon–6 PM
Cloudy, 78°26°Dry
Evening
6 PM–midnight
Cloudy, 63°17°Dry
Overnight
midnight–6 AM
Cloudy, 55°13°Dry
Official NWS forecast
Day: Partly sunny, with a high near 78. Southeast wind 1 to 5 mph.
Night: Mostly cloudy, with a low around 52. Southeast wind around 2 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
- High, likely
- 74°23°–78°26°
- Low, likely
- 46°8°–52°11°
- Typical high / low
- 64°18° / 44°7°
- Wind
- 6 mph9 km/h, gusts 11 mph18 km/h
- UV peak
- 4
Monday, Oct 26. Cloudy. High 77°25°, low 51°11°. Typical 63°17° / 44°7°. Dry. Mostly agree.
Morning
6 AM–noon
Cloudy, 55°13°Dry
Afternoon
noon–6 PM
Partly sunny, 76°24°Dry
Evening
6 PM–midnight
Cloudy, 62°17°Dry
Overnight
midnight–6 AM
Cloudy, 53°12°Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Partly sunny, with a high near 77.
Night: Mostly cloudy, with a low around 51.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
- High, likely
- 74°23°–77°25°
- Low, likely
- 51°11°–57°14°
- Typical high / low
- 63°17° / 44°7°
- Wind
- 7 mph11 km/h
- UV peak
- 4
Tuesday, Oct 27. Cloudy. High 75°24°, low 52°11°. Typical 63°17° / 44°7°. Dry. Mostly agree.
Morning
6 AM–noon
Cloudy, 55°13°Dry
Afternoon
noon–6 PM
Cloudy, 72°22°Dry
Evening
6 PM–midnight
Cloudy, 62°16°Dry
Overnight
midnight–6 AM
Mostly clear, 52°11°Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Partly sunny, with a high near 75.
Night: Mostly cloudy, with a low around 52.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
- High, likely
- 71°22°–75°24°
- Low, likely
- 49°9°–57°14°
- Typical high / low
- 63°17° / 44°7°
- Wind
- 8 mph13 km/h, gusts 22 mph35 km/h
- UV peak
- 3
Wednesday, Oct 28. Cloudy. High 78°26°, low 53°12°. Typical 62°17° / 43°6°. Dry. Mostly agree.
Morning
6 AM–noon
Sunny, 54°12°Dry
Afternoon
noon–6 PM
Sunny, 75°24°Dry
Evening
6 PM–midnight
Mostly clear, 63°17°Dry
Overnight
midnight–6 AM
Clear, 52°11°Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly sunny, with a high near 78.
Night: Mostly clear, with a low around 53.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
- High, likely
- 74°23°–78°26°
- Low, likely
- 46°8°–56°13°
- Typical high / low
- 62°17° / 43°6°
- Wind
- 10 mph16 km/h, gusts 28 mph44 km/h
- UV peak
- 4
Thursday, Oct 29. Partly sunny. High 76°24°, low 49°9°. Typical 62°17° / 43°6°. Dry. Forecasts differ.
Morning
6 AM–noon
Sunny, 53°12°Dry
Afternoon
noon–6 PM
Sunny, 74°23°Dry
Evening
6 PM–midnight
Clear, 63°17°Dry
Overnight
midnight–6 AM
Clear, 53°11°Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly sunny, with a high near 76.
Night: Partly cloudy, with a low around 49.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
- High, likely
- 69°21°–80°27°
- Low, likely
- 44°7°–57°14°
- Typical high / low
- 62°17° / 43°6°
- Wind
- 10 mph16 km/h, gusts 27 mph43 km/h
- UV peak
- 4
Friday, Oct 30. Cloudy. High 71°22°, low 56°13°. Typical 62°17° / 43°6°. Dry. Forecasts agree.
Morning
6 AM–noon
Cloudy, 56°13°Dry
Afternoon
noon–6 PM
Cloudy, 76°24°Dry
Evening
6 PM–midnight
Cloudy, 66°19°Dry
Overnight
midnight–6 AM
Drizzle, 60°16°30% chance
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly sunny, with a high near 71.
Forecasts agreeIndependent forecasts are close; the range is narrow.
- High, likely
- 71°22°–77°25°
- Low, likely
- 53°12°–60°16°
- Typical high / low
- 62°17° / 43°6°
- Wind
- 9 mph14 km/h, gusts 17 mph28 km/h
- UV peak
- 3
Saturday, Oct 31. Drizzle. High 70°21°, low 60°16°. Typical 61°16° / 42°6°. Rain 0.21 in5.3 mm, 40% chance. Forecasts differ.
Morning
6 AM–noon
Drizzle, 61°16°40% chance · 0.01 in0.3 mm
Afternoon
noon–6 PM
Drizzle, 68°20°40% chance · 0.04 in1 mm
Evening
6 PM–midnight
Drizzle, 64°18°40% chance · 0.08 in2.1 mm
Overnight
midnight–6 AM
Drizzle, 63°17°40% chance · 0.2 in5 mm
Hours this far out come from computer models only.
The National Weather Service writes about seven days ahead; this day is our model forecast only.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
- High, likely
- 65°18°–75°24°
- Low, likely
- 57°14°–62°17°
- Typical high / low
- 61°16° / 42°6°
- Wind
- 16 mph26 km/h, gusts 22 mph35 km/h
Sunday, Nov 1. Showers. High 71°22°, low 62°17°. Typical 61°16° / 42°6°. Rain 0.55 in14 mm, 40% chance. Forecasts differ.
Morning
6 AM–noon
Cloudy, 64°18°40% chance · 0.2 in5.2 mm
Afternoon
noon–6 PM
Cloudy, 70°21°40% chance · 0.06 in1.5 mm
Evening
6 PM–midnight
Drizzle, 65°18°30% chance · 0.16 in4 mm
Hours this far out come from computer models only.
The National Weather Service writes about seven days ahead; this day is our model forecast only.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
- High, likely
- 67°19°–76°24°
- Low, likely
- 60°16°–65°18°
- Typical high / low
- 61°16° / 42°6°
- Wind
- 19 mph31 km/h, gusts 39 mph63 km/h
- UV peak
- 2
The outlook
Today
Dry, high 75°, low 48°.
Tomorrow
Dry, high 76°, low 49°.
Sunday
Dry, high 78°, low 52°.
Rest of week
Mostly dry, highs 70–78°.
Want the meteorologists’ reasoning? Read the NWS forecast discussion (LSX) (opens in a new tab)
What changed since yesterday
No meaningful changes from yesterday’s forecast.
Radar
Radar data: NOAA MRMS, rendered by forecast.blue
Radar loads when scrolled into view
Rivers
NOAA river gauges within 25 mi
Below flood stage
Mississippi River at Grafton
16 mi- Level
- 15.7 ft
- Flow
- 165,000 cfs
Forecast peak 15.7 ft Sun 1 AM
Reading from Fri 5:30 PM · NWS gauge page
Missouri River at St. Charles
19 mi- Level
- 12.6 ft
- Flow
- 66,500 cfs
Forecast peak 12.6 ft Fri 7 PM
Reading from Fri 5 PM · NWS gauge page
Mississippi River at St. Louis
19 mi- Level
- 8.4 ft
- Flow
- 175,000 cfs
Forecast peak 8.5 ft Fri 7 PM
Reading from Fri 5:30 PM · NWS gauge page
For your home
What this week’s weather means for heating, cooling, pipes and fresh air.
Heating this week
About 83% less heating than a typical week.
This week 14Typical 80
Heating degree days, base 65°F
Comfort
Dry air outside (dew point 47°F).
Open the windows?
Today, 7:00 PM–8:00 PM
Good stretch to open the windows.
Is this typical?
ALTON - MELVIN PRICE L&D · official normals 1991–2020 · records 1943–2026
Oct 23, today vs a typical year
Today’s expected high is 10°6° warmer than typical.
- Normal high / low
- 65°18° / 45°7°
- Forecast high / low
- 75°24° / 48°9°
- Record high
- 83°28° in 1963
- Record low
- 28°−2° in 1976
Last 7 days vs normal
On average 3°1° warmer than normal (daily mean temperature).
- —SatOct 17
- —SunOct 18
- −4°−2°MonOct 19
- +2°+1°TueOct 20
- +6°+3°WedOct 21
- —ThuOct 22
- +7°+4°FriOct 23
Alton weather by month: normals, records, snow and freeze dates
Sun & moon
Sun
Sunrise 7:18 AM, sunset 6:10 PM.
- Daylight
- 10 h 53 min
- Losing 2 min 21 s a day; shortest Dec 21, 1 h 26 min less
- Golden hour
- 5:34–6:27 PM
- Morning 7:01–7:55 AM
- Blue hour
- 6:27–6:38 PM
- Morning 6:51–7:01 AM; first light 6:51 AM
Stars tonight? Fair
Mostly clear 6:38 PM–3 AM, but the moon is 95% lit and up.
Moon
Waxing gibbous
94% lit · growing
- Today
- sets 4:26 AM · rises 4:41 PM
- Full moon
- Oct 25
- New moon
- Nov 9
