Illinois River at Marseilles Lock (tailwater)
7.5 mi- Level
- 460 ft
- Flow
- 8,040 cfs
Forecast peak 459 ft Sat 7 AM
Reading from Sat 1:30 AM · NWS gauge page
Observed 2:35 AM CDT at KPNT
Seneca, IL weather
Clear and 46°8°, 12°7° warmer than a typical Oct 24.
Today: low 49°9° (likely 46°8° to 49°9°), high 72°22° (likely 70°21° to 72°22°).
Now 46°8°
Clear · Feels like 43°6°
- Wind
- 6 mph9 km/h
- From the east-southeast. 58–6 mph9 km/h through 3 PM
- Dew point
- 42°6°
- Comfortable
- UV index
- 0Low
- Moderate 11 AM–4 PM · peak 3
- Pressure
- 30.34 inHg1027 hPa
- Rising slowly · +0.02 inHg+0.7 hPa in 3 h
Next 2 hours
No precipitation expected in the next 2 hours.
From forecast models
Next 48 hours
Good hours for
TonightNear 50°10° · Partly cloudy
This morningUp to 64°18° by 11 AM · Mostly cloudy
This afternoonUp to 73°23° by 4 PM · Mostly cloudy
TonightDown to 50°10° by 5 AM · Partly cloudy
Tomorrow morningUp to 66°19° by 11 AM · Mostly cloudy
Tomorrow afternoonUp to 75°24° by 3 PM · Mostly cloudy
Tomorrow nightDown to 54°12° by 2 AM · Mostly cloudy
| Hour | Conditions | Temperature | Feels like | Precipitation | Wind | Humidity | Cloud cover | UV index |
|---|---|---|---|---|---|---|---|---|
| Sat 3a | Clear | 50°10° (likely 49°9° to 51°11°) | 49°9° | 0% | 5 mph8 km/h from SE, gusts 9 mph14 km/h | 78% | 24% | 0 |
| Sat 4a | Partly cloudy | 49°9° (likely 47°8° to 50°10°) | 48°9° | 0% | 5 mph8 km/h from ESE, gusts 7 mph12 km/h | 82% | 52% | 0 |
| Sat 5a | Partly cloudy | 49°9° (likely 46°8° to 49°9°) | 48°9° | 0% | 5 mph8 km/h from ESE, gusts 8 mph14 km/h | 83% | 48% | 0 |
| Sat 6a | Cloudy | 49°9° (likely 46°8° to 49°9°) | 48°9° | 0% | 5 mph8 km/h from ESE, gusts 10 mph16 km/h | 82% | 87% | 0 |
| Sat 7a | Cloudy | 49°9° (likely 46°8° to 49°9°) | 48°9° | 0% | 5 mph8 km/h from SE, gusts 9 mph14 km/h | 86% | 81% | 0 |
| Sat 8a | Mostly sunny | 49°9° (likely 46°8° to 50°10°) | 48°9° | 0% | 5 mph8 km/h from SE, gusts 9 mph15 km/h | 88% | 57% | 0 |
| Sat 9a | Partly sunny | 53°12° (likely 52°11° to 54°12°) | 53°12° | 0% | 5 mph8 km/h from SSE, gusts 12 mph19 km/h | 79% | 48% | 1 |
| Sat 10a | Cloudy | 59°15° (likely 56°13° to 60°16°) | 59°15° | 0% | 5 mph8 km/h from SSE, gusts 12 mph20 km/h | 66% | 81% | 2 |
| Sat 11a | Cloudy | 64°18° (likely 61°16° to 65°18°) | 64°18° | 0% | 5 mph8 km/h from SSE, gusts 12 mph20 km/h | 57% | 81% | 3 |
| Sat 12p | Cloudy | 67°19° (likely 65°18° to 68°20°) | 67°19° | 0% | 5 mph8 km/h from S, gusts 11 mph18 km/h | 50% | 81% | 3 |
| Sat 1p | Cloudy | 70°21° (likely 69°21° to 70°21°) | 70°21° | 0% | 5 mph8 km/h from S, gusts 11 mph18 km/h | 45% | 73% | 3 |
| Sat 2p | Cloudy | 72°22° (likely 70°21° to 72°22°) | 72°22° | 0% | 5 mph8 km/h from S, gusts 11 mph17 km/h | 41% | 79% | 3 |
| Sat 3p | Mostly cloudy | 72°22° (likely 70°21° to 72°22°) | 72°22° | 0% | 5 mph8 km/h from S, gusts 10 mph17 km/h | 40% | 51% | 3 |
| Sat 4p | Mostly cloudy | 73°23° (likely 70°21° to 73°23°) | 73°23° | 0% | 5 mph8 km/h from S, gusts 10 mph17 km/h | 39% | 62% | 2 |
| Sat 5p | Cloudy | 71°22° (likely 68°20° to 71°22°) | 71°22° | 0% | 5 mph8 km/h from SSE, gusts 10 mph16 km/h | 43% | 80% | 1 |
| Sat 6p | Clear | 68°20° (likely 63°17° to 68°20°) | 68°20° | 0% | 5 mph8 km/h from SSE, gusts 7 mph12 km/h | 47% | 46% | 0 |
| Sat 7p | Partly cloudy | 65°18° (likely 61°16° to 65°18°) | 65°18° | 5% | 5 mph8 km/h from SSE, gusts 8 mph13 km/h | 54% | 49% | 0 |
| Sat 8p | Partly cloudy | 61°16° (likely 59°15° to 61°16°) | 61°16° | 0% | 5 mph8 km/h from SSE, gusts 9 mph14 km/h | 62% | 45% | 0 |
| Sat 9p | Partly cloudy | 59°15° (likely 57°14° to 59°15°) | 59°15° | 0% | 5 mph8 km/h from SSE, gusts 8 mph12 km/h | 66% | 59% | 0 |
| Sat 10p | Partly cloudy | 58°14° (likely 56°13° to 58°14°) | 58°14° | 0% | 5 mph8 km/h from SSE, gusts 9 mph14 km/h | 68% | 65% | 0 |
| Sat 11p | Mostly clear | 56°13° (likely 54°12° to 56°13°) | 56°13° | 0% | 5 mph8 km/h from SSE, gusts 10 mph17 km/h | 70% | 33% | 0 |
| Sun 12a | Mostly clear | 55°13° (likely 53°12° to 55°13°) | 55°13° | 0% | 5 mph8 km/h from S, gusts 12 mph19 km/h | 71% | 31% | 0 |
| Sun 1a | Mostly clear | 54°12° (likely 52°11° to 54°12°) | 54°12° | 0% | 5 mph8 km/h from S, gusts 10 mph17 km/h | 73% | 36% | 0 |
| Sun 2a | Partly cloudy | 53°12° (likely 51°11° to 53°12°) | 53°12° | 0% | 5 mph8 km/h from S, gusts 10 mph16 km/h | 75% | 56% | 0 |
| Sun 3a | Mostly clear | 52°11° (likely 51°11° to 52°11°) | 52°11° | 0% | 5 mph8 km/h from S, gusts 10 mph16 km/h | 76% | 67% | 0 |
| Sun 4a | Partly cloudy | 51°11° (likely 50°10° to 51°11°) | 51°11° | 0% | 5 mph8 km/h from SSE, gusts 9 mph14 km/h | 80% | 75% | 0 |
| Sun 5a | Partly cloudy | 50°10° (likely 49°9° to 51°11°) | 49°9° | 0% | 5 mph8 km/h from SSE, gusts 8 mph12 km/h | 81% | 74% | 0 |
| Sun 6a | Cloudy | 50°10° (likely 48°9° to 50°10°) | 49°9° | 0% | 5 mph8 km/h from SSE, gusts 7 mph12 km/h | 81% | 67% | 0 |
| Sun 7a | Partly sunny | 50°10° (likely 47°8° to 50°10°) | 50°10° | 0% | 0 mph0 km/h, gusts 7 mph11 km/h | 84% | 68% | 0 |
| Sun 8a | Partly sunny | 51°11° (likely 48°9° to 52°11°) | 51°11° | 0% | 0 mph0 km/h, gusts 6 mph10 km/h | 84% | 77% | 0 |
| Sun 9a | Partly sunny | 55°13° (likely 53°12° to 56°13°) | 55°13° | 0% | 5 mph8 km/h from S, gusts 7 mph12 km/h | 74% | 70% | 1 |
| Sun 10a | Cloudy | 61°16° (likely 59°15° to 61°16°) | 61°16° | 0% | 5 mph8 km/h from S, gusts 9 mph15 km/h | 61% | 79% | 2 |
| Sun 11a | Cloudy | 66°19° (likely 64°18° to 67°19°) | 66°19° | 0% | 5 mph8 km/h from S, gusts 9 mph15 km/h | 53% | 80% | 3 |
| Sun 12p | Cloudy | 69°21° (likely 68°20° to 71°22°) | 69°21° | 0% | 5 mph8 km/h from S, gusts 8 mph13 km/h | 46% | 79% | 3 |
| Sun 1p | Cloudy | 72°22° (likely 71°22° to 73°23°) | 73°23° | 0% | 5 mph8 km/h from S, gusts 7 mph12 km/h | 41% | 78% | 3 |
| Sun 2p | Partly sunny | 74°23° (likely 73°23° to 74°23°) | 74°23° | 0% | 5 mph8 km/h from S, gusts 7 mph11 km/h | 38% | 74% | 3 |
| Sun 3p | Mostly sunny | 75°24° (likely 73°23° to 75°24°) | 75°24° | 0% | 5 mph8 km/h from S, gusts 7 mph11 km/h | 37% | 44% | 2 |
| Sun 4p | Cloudy | 75°24° (likely 73°23° to 76°24°) | 75°24° | 0% | 5 mph8 km/h from S, gusts 6 mph10 km/h | 36% | 66% | 1 |
| Sun 5p | Cloudy | 73°23° (likely 70°21° to 73°23°) | 73°23° | 0% | 0 mph0 km/h, gusts 6 mph9 km/h | 41% | 65% | 1 |
| Sun 6p | Cloudy | 70°21° (likely 65°18° to 70°21°) | 70°21° | 0% | 0 mph0 km/h, gusts 4 mph6 km/h | 45% | 73% | 0 |
| Sun 7p | Cloudy | 67°19° (likely 62°17° to 67°19°) | 67°19° | 0% | 0 mph0 km/h, gusts 5 mph8 km/h | 51% | 78% | 0 |
| Sun 8p | Cloudy | 62°17° (likely 60°16° to 63°17°) | 62°17° | 0% | 0 mph0 km/h, gusts 6 mph9 km/h | 60% | 84% | 0 |
| Sun 9p | Mostly clear | 60°16° (likely 58°14° to 61°16°) | 60°16° | 0% | 0 mph0 km/h, gusts 4 mph7 km/h | 66% | 76% | 0 |
| Sun 10p | Cloudy | 59°15° (likely 56°13° to 59°15°) | 59°15° | 0% | 0 mph0 km/h, gusts 5 mph7 km/h | 68% | 76% | 0 |
| Sun 11p | Cloudy | 57°14° (likely 54°12° to 58°14°) | 57°14° | 0% | 0 mph0 km/h, gusts 4 mph7 km/h | 71% | 80% | 0 |
| Mon 12a | Cloudy | 56°13° (likely 53°12° to 57°14°) | 56°13° | 0% | 0 mph0 km/h, gusts 4 mph7 km/h | 72% | 75% | 0 |
| Mon 1a | Cloudy | 55°13° (likely 52°11° to 57°14°) | 55°13° | 0% | 0 mph0 km/h, gusts 4 mph6 km/h | 74% | 70% | 0 |
| Mon 2a | Mostly clear | 54°12° (likely 50°10° to 58°14°) | 54°12° | 0% | 0 mph0 km/h, gusts 3 mph5 km/h | 76% | 51% | 0 |
Days ahead
Shaded: typical range for these dates (1991–2020)
Today, Oct 24. Cloudy. High 72°22°, low 49°9°. Typical 60°16° / 40°4°. Dry. Forecasts agree.
Morning
6 AM–noon
Partly sunny, 49°9°Dry
Afternoon
noon–6 PM
Mostly cloudy, 73°23°Dry
Evening
6 PM–midnight
Partly cloudy, 61°16°Dry
Overnight
midnight–6 AM
Mostly clear, 50°10°Dry
Official NWS forecast
Today: Mostly sunny, with a high near 72. South southeast wind around 5 mph, with gusts as high as 15 mph.
Tonight: Mostly clear, with a low around 49. Southeast wind around 5 mph.
Forecasts agreeIndependent forecasts are close; the range is narrow.
- High, likely
- 70°21°–72°22°
- Low, likely
- 46°8°–49°9°
- Typical high / low
- 60°16° / 40°4°
- Wind
- 8 mph14 km/h, gusts 19 mph30 km/h
- UV peak
- 3
Tomorrow, Oct 25. Cloudy. High 75°24°, low 51°11°. Typical 60°16° / 40°4°. Dry. Forecasts agree.
Morning
6 AM–noon
Partly sunny, 51°11°Dry
Afternoon
noon–6 PM
Mostly sunny, 75°24°Dry
Evening
6 PM–midnight
Mostly clear, 62°17°Dry
Overnight
midnight–6 AM
Partly cloudy, 52°11°Dry
Official NWS forecast
Day: Mostly sunny, with a high near 75. South southeast wind 0 to 5 mph.
Night: Partly cloudy, with a low around 51. South wind around 0 mph.
Forecasts agreeIndependent forecasts are close; the range is narrow.
- High, likely
- 73°23°–76°24°
- Low, likely
- 47°8°–51°11°
- Typical high / low
- 60°16° / 40°4°
- Wind
- 7 mph12 km/h, gusts 18 mph28 km/h
- UV peak
- 3
Monday, Oct 26. Cloudy. High 72°22°, low 50°10°. Typical 59°15° / 39°4°. Dry. Mostly agree.
Morning
6 AM–noon
Cloudy, 52°11°Dry
Afternoon
noon–6 PM
Cloudy, 72°22°Dry
Evening
6 PM–midnight
Cloudy, 59°15°Dry
Overnight
midnight–6 AM
Cloudy, 52°11°Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Partly sunny, with a high near 72.
Night: Mostly cloudy, with a low around 50.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
- High, likely
- 69°21°–74°23°
- Low, likely
- 47°8°–53°12°
- Typical high / low
- 59°15° / 39°4°
- Wind
- 11 mph17 km/h, gusts 20 mph31 km/h
- UV peak
- 3
Tuesday, Oct 27. Cloudy. High 71°22°, low 53°12°. Typical 59°15° / 39°4°. Dry. Mostly agree.
Morning
6 AM–noon
Cloudy, 53°12°Dry
Afternoon
noon–6 PM
Cloudy, 70°21°Dry
Evening
6 PM–midnight
Cloudy, 62°17°Dry
Overnight
midnight–6 AM
Cloudy, 56°13°Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly cloudy, with a high near 71.
Night: Mostly cloudy, with a low around 53.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
- High, likely
- 69°21°–73°23°
- Low, likely
- 48°9°–53°12°
- Typical high / low
- 59°15° / 39°4°
- Wind
- 11 mph17 km/h, gusts 26 mph41 km/h
- UV peak
- 3
Wednesday, Oct 28. Partly sunny. High 75°24°, low 53°12°. Typical 58°14° / 38°3°. Dry. Mostly agree. Best day outdoors this week.
Morning
6 AM–noon
Sunny, 57°14°Dry
Afternoon
noon–6 PM
Sunny, 75°24°Dry
Evening
6 PM–midnight
Clear, 64°18°Dry
Overnight
midnight–6 AM
Clear, 59°15°Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly sunny, with a high near 75.
Night: Partly cloudy, with a low around 53.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
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
- 53°12°–57°14°
- Typical high / low
- 58°14° / 38°3°
- Wind
- 12 mph19 km/h, gusts 23 mph36 km/h
- UV peak
- 4
Thursday, Oct 29. Partly sunny. High 72°22°, low 49°9°. Typical 58°14° / 38°3°. Dry. Forecasts differ.
Morning
6 AM–noon
Mostly sunny, 60°15°Dry
Afternoon
noon–6 PM
Mostly sunny, 72°22°Dry
Evening
6 PM–midnight
Clear, 62°16°Dry
Overnight
midnight–6 AM
Clear, 53°12°Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly sunny, with a high near 72.
Night: Partly cloudy, with a low around 49.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
- High, likely
- 70°21°–77°25°
- Low, likely
- 49°9°–59°15°
- Typical high / low
- 58°14° / 38°3°
- Wind
- 14 mph23 km/h, gusts 31 mph50 km/h
- UV peak
- 3
Friday, Oct 30. Showers. High 70°21°, low 53°12°. Typical 57°14° / 38°3°. Rain 0.02 in0.5 mm, 20% chance. Forecasts differ.
Morning
6 AM–noon
Cloudy, 55°13°Dry
Afternoon
noon–6 PM
Cloudy, 73°23°Dry
Evening
6 PM–midnight
Drizzle, 64°18°Dry
Overnight
midnight–6 AM
Cloudy, 58°14°Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: A slight chance of rain showers after 7am. Partly sunny, with a high near 70.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
- High, likely
- 69°21°–78°26°
- Low, likely
- 44°7°–60°16°
- Typical high / low
- 57°14° / 38°3°
- Wind
- 11 mph18 km/h, gusts 20 mph33 km/h
- UV peak
- 3
Saturday, Oct 31. Cloudy. High 73°23°, low 59°15°. Typical 56°13° / 37°3°. Rain 0.12 in3 mm, 40% chance. Forecasts differ.
Morning
6 AM–noon
Cloudy, 62°17°30% chance
Afternoon
noon–6 PM
Drizzle, 74°23°30% chance
Evening
6 PM–midnight
Rain, 65°18°40% chance · 0.05 in1.3 mm
Overnight
midnight–6 AM
Rain, 62°17°50% chance · 0.07 in1.9 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
- 69°21°–78°26°
- Low, likely
- 57°14°–60°16°
- Typical high / low
- 56°13° / 37°3°
- Wind
- 13 mph20 km/h, gusts 23 mph37 km/h
- UV peak
- 1
Sunday, Nov 1. Rain. High 67°19°, low 61°16°. Typical 56°13° / 37°3°. Rain 0.48 in12 mm, 50% chance. Mostly agree.
Morning
6 AM–noon
Drizzle, 63°17°50% chance · 0.02 in0.6 mm
Afternoon
noon–6 PM
Drizzle, 66°19°40% chance · 0.22 in5.6 mm
Evening
6 PM–midnight
Cloudy, 64°18°40% chance · 0.27 in6.8 mm
Overnight
midnight–6 AM
Cloudy, 56°13°40% chance · 0.04 in1.1 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.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
- High, likely
- 65°18°–68°20°
- Low, likely
- 57°14°–63°17°
- Typical high / low
- 56°13° / 37°3°
- Wind
- 24 mph38 km/h, gusts 39 mph63 km/h
- UV peak
- 2
Monday, Nov 2. Cloudy. High 64°18°, low 51°11°. Typical 56°13° / 37°3°. Rain 0.39 in9.9 mm, 40% chance. Forecasts agree.
Morning
6 AM–noon
Partly sunny, 57°14°30% chance · 0.04 in1 mm
Afternoon
noon–6 PM
Cloudy, 58°14°20% chance · 0.07 in1.7 mm
Evening
6 PM–midnight
Cloudy, 52°11°20% chance
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 agreeIndependent forecasts are close; the range is narrow.
- High, likely
- 62°17°–65°18°
- Low, likely
- 44°7°–56°13°
- Typical high / low
- 56°13° / 37°3°
- Wind
- 19 mph31 km/h, gusts 44 mph71 km/h
- UV peak
- 2
The outlook
Today
Dry, high 72°, low 49°.
Tomorrow
Dry, high 75°, low 51°, warming up.
Monday
Dry, high 72°, low 50°, cooling off.
Rest of week
Highs 64–75°; chance of precipitation on Sunday.
Want the meteorologists’ reasoning? Read the NWS forecast discussion (LOT) (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
Illinois River at Morris
10 mi- Level
- 5.1 ft
- Flow
- 4,950 cfs
Forecast peak 5.1 ft Sat 1 PM
Reading from Sat 1:45 AM · NWS gauge page
Illinois River at Starved Rock Lock (tailwater)
19 mi- Level
- 442 ft
- Flow
- 4,970 cfs
Forecast peak 442 ft Sat 7 AM
Reading from Sat 1 AM · NWS gauge page
Illinois River at Seneca
0.2 mi- Level
- 20.6 ft
Reading from Sat 1:45 AM · NWS gauge page
For your home
What this week’s weather means for heating, cooling, pipes and fresh air.
Heating this week
About 89% less heating than a typical week.
This week 13Typical 114
Heating degree days, base 65°F
Comfort
Dry air outside (dew point 42°F).
Open the windows?
Today, 11:00 AM–8:00 PM
Good stretch to open the windows (air quality forecast not available for part of this window).
Is this typical?
Ottawa 4sw · official normals 1991–2020 · records 1890–2026
Oct 24, today vs a typical year
Today’s expected high is 12°7° warmer than typical.
- Normal high / low
- 60°16° / 40°4°
- Forecast high / low
- 72°22° / 49°9°
- Record high
- 85°29° in 1963
- Record low
- 21°−6° in 1981
Last 7 days vs normal
On average 2°1° warmer than normal (daily mean temperature).
- −8°−4°SunOct 18
- −2°−1°MonOct 19
- +2°+1°TueOct 20
- +5°+3°WedOct 21
- +6°+3°ThuOct 22
- +9°+5°FriOct 23
- —SatOct 24
Seneca weather by month: normals, records, snow and freeze dates
Sun & moon
Sun
Sunrise 7:16 AM, sunset 6:00 PM.
- Daylight
- 10 h 44 min
- Losing 2 min 35 s a day; shortest Dec 21, 1 h 32 min less
- Golden hour
- 5:21–6:17 PM
- Morning 6:59–7:54 AM
- Blue hour
- 6:17–6:28 PM
- Morning 6:48–6:59 AM; first light 6:48 AM
Stars tonight? Poor
Clouds most of the night (about 53% cover).
Moon
Waxing gibbous
96% lit · growing
- Today
- sets 5:29 AM · rises 4:58 PM
- Full moon
- Oct 25
- New moon
- Nov 9
