Illinois River at Marseilles Lock (tailwater)
11 mi- Level
- 459 ft
- Flow
- 3,480 cfs
Forecast peak 459 ft Sat 7 AM
Reading from Sat 5:30 AM · NWS gauge page
Observed 6:35 AM CDT at KARR
Serena, IL weather
Clear and 46°8°, 13°7° warmer than a typical Oct 24.
Today: low 48°9° (likely 45°7° to 48°9°), high 73°23° (likely 70°21° to 73°23°).
Now 46°8°
Clear
- Wind
- 3 mph5 km/h
- From the east. 35–5 mph8 km/h through 6 PM
- Dew point
- 43°6°
- Comfortable
- UV index
- 0Low
- Moderate 12–3 PM · peak 3
- Pressure
- 30.38 inHg1029 hPa
- Rising slowly · +0.03 inHg+1.0 hPa in 3 h
Next 2 hours
No precipitation expected in the next 2 hours.
From forecast models
Next 48 hours
Good hours for
This morningUp to 64°18° by 11 AM · Mostly cloudy
This afternoonUp to 73°23° by 3 PM · Mostly cloudy
TonightDown to 50°10° by 4 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 50°10° by 5 AM · Mostly cloudy
| Hour | Conditions | Temperature | Feels like | Precipitation | Wind | Humidity | Cloud cover | UV index |
|---|---|---|---|---|---|---|---|---|
| Sat 6a | Mostly clear | 48°9° (likely 45°7° to 48°9°) | 48°9° | 0% | 5 mph8 km/h from SE, gusts 7 mph11 km/h | 82% | 64% | 0 |
| Sat 7a | Partly sunny | 48°9° (likely 45°7° to 48°9°) | 47°8° | 0% | 5 mph8 km/h from ESE, gusts 7 mph11 km/h | 86% | 68% | 0 |
| Sat 8a | Partly sunny | 49°9° (likely 45°7° to 49°9°) | 48°9° | 0% | 5 mph8 km/h from SE, gusts 8 mph13 km/h | 85% | 36% | 0 |
| Sat 9a | Sunny | 54°12° (likely 51°11° to 54°12°) | 54°12° | 0% | 5 mph8 km/h from SSE, gusts 10 mph17 km/h | 73% | 44% | 0 |
| 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 | 65% | 81% | 1 |
| Sat 11a | Cloudy | 64°18° (likely 60°16° to 65°18°) | 64°18° | 0% | 5 mph8 km/h from S, gusts 13 mph20 km/h | 55% | 79% | 2 |
| Sat 12p | Cloudy | 67°19° (likely 64°18° to 68°20°) | 67°19° | 0% | 5 mph8 km/h from S, gusts 11 mph18 km/h | 49% | 74% | 3 |
| Sat 1p | Sunny | 70°21° (likely 67°19° to 70°21°) | 70°21° | 0% | 5 mph8 km/h from S, gusts 11 mph18 km/h | 43% | 38% | 3 |
| Sat 2p | Cloudy | 72°22° (likely 69°21° to 72°22°) | 72°22° | 0% | 5 mph8 km/h from S, gusts 10 mph17 km/h | 39% | 73% | 3 |
| Sat 3p | Cloudy | 73°23° (likely 70°21° to 73°23°) | 73°23° | 0% | 5 mph8 km/h from S, gusts 10 mph16 km/h | 38% | 77% | 2 |
| Sat 4p | Mostly cloudy | 73°23° (likely 69°21° to 73°23°) | 73°23° | 0% | 5 mph8 km/h from SSE, gusts 11 mph17 km/h | 38% | 48% | 1 |
| Sat 5p | Cloudy | 71°22° (likely 67°19° to 71°22°) | 71°22° | 0% | 5 mph8 km/h from SSE, gusts 11 mph18 km/h | 40% | 80% | 0 |
| Sat 6p | Mostly cloudy | 67°19° (likely 63°17° to 67°19°) | 67°19° | 0% | 5 mph8 km/h from SSE, gusts 8 mph13 km/h | 47% | 53% | 0 |
| Sat 7p | Mostly cloudy | 63°17° (likely 60°16° to 63°17°) | 63°17° | 5% | 5 mph8 km/h from SSE, gusts 9 mph15 km/h | 54% | 63% | 0 |
| Sat 8p | Clear | 60°16° (likely 58°14° to 60°16°) | 60°16° | 5% | 5 mph8 km/h from SSE, gusts 9 mph15 km/h | 60% | 29% | 0 |
| Sat 9p | Clear | 58°14° (likely 56°13° to 58°14°) | 58°14° | 0% | 5 mph8 km/h from SSE, gusts 10 mph16 km/h | 64% | 11% | 0 |
| Sat 10p | Clear | 57°14° (likely 54°12° to 57°14°) | 57°14° | 0% | 5 mph8 km/h from SSE, gusts 10 mph15 km/h | 67% | 7% | 0 |
| Sat 11p | Clear | 56°13° (likely 52°11° to 56°13°) | 56°13° | 0% | 5 mph8 km/h from SSE, gusts 10 mph16 km/h | 70% | 2% | 0 |
| Sun 12a | Clear | 54°12° (likely 51°11° to 55°13°) | 54°12° | 0% | 5 mph8 km/h from S, gusts 10 mph15 km/h | 71% | 27% | 0 |
| Sun 1a | Partly cloudy | 53°12° (likely 50°10° to 54°12°) | 53°12° | 0% | 5 mph8 km/h from S, gusts 8 mph13 km/h | 73% | 32% | 0 |
| Sun 2a | Partly cloudy | 52°11° (likely 49°9° to 53°12°) | 52°11° | 5% | 5 mph8 km/h from S, gusts 9 mph14 km/h | 76% | 56% | 0 |
| Sun 3a | Partly cloudy | 51°11° (likely 49°9° to 52°11°) | 51°11° | 5% | 5 mph8 km/h from S, gusts 9 mph14 km/h | 78% | 59% | 0 |
| Sun 4a | Cloudy | 50°10° (likely 48°9° to 51°11°) | 50°10° | 0% | 5 mph8 km/h from S, gusts 9 mph14 km/h | 80% | 76% | 0 |
| Sun 5a | Cloudy | 50°10° (likely 47°8° to 50°10°) | 49°9° | 0% | 5 mph8 km/h from S, gusts 8 mph13 km/h | 81% | 88% | 0 |
| Sun 6a | Cloudy | 49°9° (likely 47°8° to 49°9°) | 48°9° | 0% | 5 mph8 km/h from SSE, gusts 6 mph10 km/h | 81% | 88% | 0 |
| Sun 7a | Cloudy | 48°9° (likely 46°8° to 50°10°) | 49°9° | 0% | 0 mph0 km/h, gusts 5 mph9 km/h | 86% | 84% | 0 |
| Sun 8a | Cloudy | 50°10° (likely 47°8° to 51°11°) | 50°10° | 0% | 0 mph0 km/h, gusts 6 mph10 km/h | 84% | 89% | 0 |
| Sun 9a | Cloudy | 56°13° (likely 52°11° to 56°13°) | 56°13° | 0% | 5 mph8 km/h from S, gusts 6 mph10 km/h | 71% | 79% | 1 |
| Sun 10a | Cloudy | 61°16° (likely 59°15° to 61°16°) | 61°16° | 0% | 5 mph8 km/h from S, gusts 9 mph14 km/h | 62% | 80% | 2 |
| Sun 11a | Cloudy | 66°19° (likely 63°17° to 66°19°) | 66°19° | 0% | 5 mph8 km/h from S, gusts 9 mph15 km/h | 52% | 81% | 2 |
| Sun 12p | Cloudy | 70°21° (likely 67°19° to 70°21°) | 70°21° | 0% | 5 mph8 km/h from S, gusts 8 mph13 km/h | 46% | 81% | 3 |
| Sun 1p | Cloudy | 72°22° (likely 70°21° to 73°23°) | 72°22° | 0% | 5 mph8 km/h from S, gusts 7 mph12 km/h | 41% | 82% | 3 |
| Sun 2p | Cloudy | 74°23° (likely 71°22° to 74°23°) | 74°23° | 0% | 5 mph8 km/h from S, gusts 7 mph12 km/h | 37% | 78% | 3 |
| Sun 3p | Mostly cloudy | 75°24° (likely 72°22° to 75°24°) | 75°24° | 0% | 5 mph8 km/h from S, gusts 8 mph12 km/h | 36% | 52% | 3 |
| Sun 4p | Cloudy | 75°24° (likely 71°22° to 75°24°) | 75°24° | 0% | 5 mph8 km/h from S, gusts 7 mph11 km/h | 36% | 69% | 2 |
| Sun 5p | Cloudy | 73°23° (likely 69°21° to 73°23°) | 73°23° | 0% | 0 mph0 km/h, gusts 6 mph10 km/h | 40% | 70% | 1 |
| Sun 6p | Cloudy | 69°21° (likely 64°18° to 69°21°) | 69°21° | 0% | 0 mph0 km/h, gusts 5 mph8 km/h | 44% | 77% | 0 |
| Sun 7p | Cloudy | 65°18° (likely 62°17° to 65°18°) | 65°18° | 0% | 0 mph0 km/h, gusts 7 mph12 km/h | 52% | 78% | 0 |
| Sun 8p | Cloudy | 62°17° (likely 59°15° to 62°17°) | 62°17° | 0% | 0 mph0 km/h, gusts 7 mph12 km/h | 58% | 79% | 0 |
| Sun 9p | Cloudy | 60°16° (likely 58°14° to 60°16°) | 60°16° | 0% | 0 mph0 km/h, gusts 5 mph9 km/h | 63% | 76% | 0 |
| Sun 10p | Cloudy | 58°14° (likely 56°13° to 58°14°) | 58°14° | 0% | 0 mph0 km/h, gusts 5 mph8 km/h | 66% | 76% | 0 |
| Sun 11p | Cloudy | 57°14° (likely 55°13° to 57°14°) | 57°14° | 0% | 0 mph0 km/h, gusts 4 mph7 km/h | 68% | 73% | 0 |
| Mon 12a | Cloudy | 56°13° (likely 54°12° to 56°13°) | 56°13° | 0% | 0 mph0 km/h, gusts 3 mph5 km/h | 71% | 72% | 0 |
| Mon 1a | Cloudy | 55°13° (likely 53°12° to 56°13°) | 55°13° | 0% | 0 mph0 km/h, gusts 3 mph5 km/h | 73% | 80% | 0 |
| Mon 2a | Cloudy | 54°12° (likely 52°11° to 57°14°) | 54°12° | 0% | 0 mph0 km/h, gusts 2 mph3 km/h | 75% | 84% | 0 |
| Mon 3a | Cloudy | 53°12° (likely 51°11° to 57°14°) | 53°12° | 0% | 0 mph0 km/h, gusts 2 mph3 km/h | 78% | 81% | 0 |
| Mon 4a | Mostly cloudy | 52°11° (likely 48°9° to 57°14°) | 52°11° | 0% | 0 mph0 km/h, gusts 2 mph3 km/h | 81% | 61% | 0 |
| Mon 5a | Mostly cloudy | 50°10° (likely 47°8° to 56°13°) | 51°11° | 0% | 0 mph0 km/h, gusts 2 mph3 km/h | 84% | 63% | 0 |
Days ahead
Shaded: typical range for these dates (1991–2020)
Today, Oct 24. Cloudy. High 73°23°, low 48°9°. Typical 60°16° / 40°4°. Dry. Mostly agree.
Morning
6 AM–noon
Sunny, 49°9°Dry
Afternoon
noon–6 PM
Cloudy, 73°23°Dry
Evening
6 PM–midnight
Clear, 60°16°Dry
Overnight
midnight–6 AM
Partly cloudy, 50°10°Dry
Official NWS forecast
Today: Partly sunny. High near 73, with temperatures falling to around 71 in the afternoon. Southeast wind around 5 mph, with gusts as high as 15 mph.
Tonight: Partly cloudy. Low around 48, with temperatures rising to around 50 overnight. South southeast wind around 5 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
- High, likely
- 70°21°–73°23°
- Low, likely
- 45°7°–48°9°
- Typical high / low
- 60°16° / 40°4°
- Wind
- 10 mph16 km/h, gusts 17 mph28 km/h
- UV peak
- 3
Tomorrow, Oct 25. Cloudy. High 75°24°, low 50°10°. Typical 60°16° / 40°4°. Dry. Mostly agree.
Morning
6 AM–noon
Cloudy, 50°10°Dry
Afternoon
noon–6 PM
Mostly cloudy, 75°24°Dry
Evening
6 PM–midnight
Cloudy, 62°17°Dry
Overnight
midnight–6 AM
Cloudy, 50°10°Dry
Official NWS forecast
Day: Mostly sunny. High near 75, with temperatures falling to around 73 in the afternoon. South wind 0 to 5 mph.
Night: Mostly cloudy, with a low around 50. South southeast wind around 0 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
- High, likely
- 72°22°–75°24°
- Low, likely
- 46°8°–50°10°
- Typical high / low
- 60°16° / 40°4°
- Wind
- 6 mph10 km/h, gusts 14 mph23 km/h
- UV peak
- 3
Monday, Oct 26. Mostly cloudy. High 71°22°, low 48°9°. Typical 59°15° / 39°4°. Dry. Forecasts differ.
Morning
6 AM–noon
Cloudy, 51°11°Dry
Afternoon
noon–6 PM
Cloudy, 70°21°Dry
Evening
6 PM–midnight
Cloudy, 57°14°Dry
Overnight
midnight–6 AM
Cloudy, 51°11°Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Partly sunny, with a high near 71. East northeast wind 0 to 10 mph.
Night: Mostly cloudy, with a low around 48.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
- High, likely
- 68°20°–73°23°
- Low, likely
- 47°8°–52°11°
- Typical high / low
- 59°15° / 39°4°
- Wind
- 14 mph22 km/h, gusts 21 mph34 km/h
- UV peak
- 3
Tuesday, Oct 27. Mostly cloudy. High 70°21°, low 52°11°. Typical 59°15° / 39°4°. Dry. Forecasts differ.
Morning
6 AM–noon
Cloudy, 52°11°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 70.
Night: Mostly cloudy, with a low around 52.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
- High, likely
- 67°19°–72°22°
- Low, likely
- 48°9°–52°11°
- Typical high / low
- 59°15° / 39°4°
- Wind
- 13 mph21 km/h, gusts 27 mph43 km/h
- UV peak
- 3
Wednesday, Oct 28. Partly sunny. High 74°23°, low 52°11°. Typical 58°14° / 38°3°. Dry. Mostly agree. Best day outdoors this week.
Morning
6 AM–noon
Partly sunny, 56°13°Dry
Afternoon
noon–6 PM
Sunny, 73°23°Dry
Evening
6 PM–midnight
Clear, 64°18°Dry
Overnight
midnight–6 AM
Cloudy, 59°15°Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly sunny, with a high near 74.
Night: Partly cloudy, with a low around 52.
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 74°23°).
- High, likely
- 72°22°–75°24°
- Low, likely
- 52°11°–55°13°
- Typical high / low
- 58°14° / 38°3°
- Wind
- 12 mph19 km/h, gusts 23 mph37 km/h
- UV peak
- 4
Thursday, Oct 29. Partly sunny. High 71°22°, low 48°9°. Typical 58°14° / 38°3°. Dry. Forecasts differ.
Morning
6 AM–noon
Partly sunny, 60°15°Dry
Afternoon
noon–6 PM
Partly sunny, 73°23°Dry
Evening
6 PM–midnight
Clear, 62°17°Dry
Overnight
midnight–6 AM
Clear, 55°13°Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly sunny, with a high near 71.
Night: Partly cloudy, with a low around 48.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
- High, likely
- 70°21°–76°24°
- Low, likely
- 48°9°–59°15°
- Typical high / low
- 58°14° / 38°3°
- Wind
- 11 mph18 km/h, gusts 30 mph49 km/h
- UV peak
- 3
Friday, Oct 30. Showers. High 70°21°, low 50°10°. Typical 57°14° / 38°3°. Rain 0.01 in0.3 mm, 20% chance. Forecasts differ.
Morning
6 AM–noon
Cloudy, 56°13°Dry
Afternoon
noon–6 PM
Cloudy, 70°21°Dry
Evening
6 PM–midnight
Partly cloudy, 61°16°Dry
Overnight
midnight–6 AM
Cloudy, 54°12°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.
Night: A slight chance of rain showers. Mostly cloudy, with a low around 50.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
- High, likely
- 64°18°–77°25°
- Low, likely
- 45°7°–59°15°
- Typical high / low
- 57°14° / 38°3°
- Wind
- 13 mph22 km/h
- UV peak
- 3
Saturday, Oct 31. Cloudy. High 71°22°, low 56°13°. Typical 56°13° / 37°3°. Rain 0.08 in2 mm, 40% chance. Forecasts differ.
Morning
6 AM–noon
Cloudy, 58°14°20% chance
Afternoon
noon–6 PM
Drizzle, 72°22°30% chance
Evening
6 PM–midnight
Drizzle, 65°18°40% chance · 0.02 in0.5 mm
Overnight
midnight–6 AM
Drizzle, 61°16°50% chance · 0.05 in1.2 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
- 68°20°–78°26°
- Low, likely
- 53°12°–59°15°
- Typical high / low
- 56°13° / 37°3°
- Wind
- 13 mph21 km/h, gusts 24 mph39 km/h
- UV peak
- 3
Sunday, Nov 1. Showers. High 67°19°, low 60°16°. Typical 56°13° / 37°3°. Rain 0.69 in18 mm, 50% chance. Forecasts agree.
Morning
6 AM–noon
Drizzle, 62°17°50% chance · 0.17 in4.2 mm
Afternoon
noon–6 PM
Drizzle, 65°18°50% chance · 0.25 in6.2 mm
Evening
6 PM–midnight
Showers, 63°17°40% chance · 0.24 in6.1 mm
Overnight
midnight–6 AM
Showers, 58°15°40% chance · 0.04 in1 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 agreeIndependent forecasts are close; the range is narrow.
- High, likely
- 66°19°–68°20°
- Low, likely
- 58°14°–61°16°
- Typical high / low
- 56°13° / 37°3°
- Wind
- 25 mph41 km/h, gusts 44 mph71 km/h
- UV peak
- 2
Monday, Nov 2. Showers. High 64°18°, low 55°13°. Typical 56°13° / 37°3°. Rain 0.53 in13 mm, 40% chance. Mostly agree.
Morning
6 AM–noon
Drizzle, 58°15°30% chance · 0.04 in0.9 mm
Afternoon
noon–6 PM
Showers, 60°16°40% chance · 0.33 in8.4 mm
Evening
6 PM–midnight
Cloudy, 59°15°40% chance · 0.11 in2.8 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
- 60°16°–67°19°
- Low, likely
- 48°9°–62°17°
- Typical high / low
- 56°13° / 37°3°
- Wind
- 22 mph35 km/h, gusts 30 mph49 km/h
- UV peak
- 2
The outlook
Today
Dry, high 73°, low 48°.
Tomorrow
Dry, high 75°, low 50°.
Monday
Dry, high 71°, low 48°, cooling off.
Rest of week
Highs 64–74°; chance of precipitation on Sunday, Monday.
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 Starved Rock Lock (tailwater)
17 mi- Level
- 442 ft
- Flow
- 4,830 cfs
Forecast peak 442 ft Sat 7 AM
Reading from Sat 5 AM · NWS gauge page
Illinois River at Morris
18 mi- Level
- 5.1 ft
- Flow
- 4,980 cfs
Forecast peak 5.1 ft Sat 1 PM
Reading from Sat 5:45 AM · NWS gauge page
Illinois River near La Salle
23 mi- Level
- 11.6 ft
- Flow
- 6,050 cfs
Forecast peak 11.4 ft Sat 7 AM
Reading from Sat 5:45 AM · NWS gauge page
For your home
What this week’s weather means for heating, cooling, pipes and fresh air.
Heating this week
About 88% less heating than a typical week.
This week 13Typical 114
Heating degree days, base 65°F
Comfort
Dry air outside (dew point 43°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 13°7° warmer than typical.
- Normal high / low
- 60°16° / 40°4°
- Forecast high / low
- 73°23° / 48°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
Serena weather by month: normals, records, snow and freeze dates
Sun & moon
Sun
Sunrise 7:17 AM, sunset 6:00 PM.
- Daylight
- 10 h 43 min
- Losing 2 min 35 s a day; shortest Dec 21, 1 h 33 min less
- Golden hour
- 5:21–6:17 PM
- Morning 6:59–7:55 AM
- Blue hour
- 6:17–6:28 PM
- Morning 6:49–6:59 AM; first light 6:49 AM
Stars tonight? Fair
Mostly clear 9 PM–12 AM, but the moon is 99% lit and up.
Moon
Waxing gibbous
96% lit · growing
- Today
- sets 5:30 AM · rises 4:58 PM
- Full moon
- Oct 25
- New moon
- Nov 9
