Lake Fork (Central IL) near Cornland
10 mi- Level
- 3.4 ft
- Flow
- 8 cfs
Reading from Fri 7:30 AM · NWS gauge page
Observed 8:00 AM CDT at KDEC
Illiopolis, IL weather
Sunny and 45°7°.
Today: low 47°8° (likely 46°8° to 49°9°), high 75°24° (likely 73°23° to 75°24°).
Now 45°7°
Sunny
- Wind
- 3 mph5 km/h
- From the east-northeast. 35–7 mph11 km/h through 9 PM
- Dew point
- 43°6°
- Comfortable
- Humidity
- 93%
- Air 45°7°, dew point 43°6° · fog or dew likely
- UV index
- 1Low
- Moderate 11 AM–4 PM · peak 4
- Air quality
- 61Moderate
- Main pollutant: PM2.5 (fine particles)
- Pressure
- 30.31 inHg1026 hPa
- Rising slowly · +0.02 inHg+0.8 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 66°19° by 11 AM · Clear
This afternoonUp to 75°24° by 4 PM · Clear
TonightDown to 48°9° by 5 AM · Partly cloudy
Tomorrow morningUp to 66°19° by 11 AM · Mostly cloudy
Tomorrow afternoonUp to 75°24° by 4 PM · Partly cloudy
Tomorrow nightDown to 49°9° by 5 AM · Partly cloudy
Sunday morningUp to 53°12° by 8 AM · Partly cloudy
| Hour | Conditions | Temperature | Feels like | Precipitation | Wind | Humidity | Cloud cover | UV index |
|---|---|---|---|---|---|---|---|---|
| Fri 9a | Sunny | 55°13° (likely 53°12° to 56°13°) | 55°13° | 0% | 5 mph8 km/h from SE, gusts 10 mph15 km/h | 77% | 0% | 1 |
| Fri 10a | Sunny | 61°16° (likely 60°16° to 61°16°) | 61°16° | 0% | 6 mph10 km/h from SSE, gusts 11 mph18 km/h | 65% | 0% | 1 |
| Fri 11a | Sunny | 66°19° (likely 65°18° to 67°19°) | 66°19° | 0% | 6 mph10 km/h from SSE, gusts 10 mph17 km/h | 56% | 0% | 3 |
| Fri 12p | Sunny | 70°21° (likely 69°21° to 71°22°) | 70°21° | 0% | 7 mph11 km/h from SSE, gusts 10 mph16 km/h | 49% | 0% | 4 |
| Fri 1p | Sunny | 73°23° (likely 72°22° to 73°23°) | 73°23° | 0% | 7 mph11 km/h from SSE, gusts 9 mph15 km/h | 44% | 0% | 4 |
| Fri 2p | Sunny | 74°23° (likely 73°23° to 74°23°) | 74°23° | 0% | 6 mph10 km/h from SSE, gusts 9 mph15 km/h | 41% | 1% | 4 |
| Fri 3p | Sunny | 74°23° (likely 73°23° to 75°24°) | 74°23° | 0% | 6 mph10 km/h from SE, gusts 9 mph14 km/h | 40% | 0% | 3 |
| Fri 4p | Sunny | 75°24° (likely 72°22° to 75°24°) | 75°24° | 0% | 6 mph10 km/h from SE, gusts 8 mph13 km/h | 38% | 1% | 1 |
| Fri 5p | Sunny | 73°23° (likely 70°21° to 73°23°) | 73°23° | 0% | 6 mph10 km/h from SE, gusts 9 mph14 km/h | 41% | 3% | 0 |
| Fri 6p | Mostly clear | 70°21° (likely 65°18° to 70°21°) | 70°21° | 0% | 6 mph10 km/h from ESE, gusts 9 mph14 km/h | 46% | 26% | 0 |
| Fri 7p | Mostly clear | 65°18° (likely 61°16° to 65°18°) | 65°18° | 0% | 6 mph10 km/h from ESE, gusts 8 mph14 km/h | 54% | 16% | 0 |
| Fri 8p | Mostly clear | 60°16° (likely 58°14° to 61°16°) | 60°16° | 0% | 6 mph10 km/h from ESE, gusts 10 mph16 km/h | 62% | 14% | 0 |
| Fri 9p | Clear | 58°14° (likely 57°14° to 59°15°) | 58°14° | 0% | 6 mph10 km/h from SE, gusts 11 mph18 km/h | 64% | 29% | 0 |
| Fri 10p | Clear | 56°13° (likely 54°12° to 58°14°) | 56°13° | 0% | 5 mph8 km/h from SE, gusts 13 mph21 km/h | 69% | 40% | 0 |
| Fri 11p | Mostly clear | 55°13° (likely 53°12° to 56°13°) | 55°13° | 0% | 5 mph8 km/h from SE, gusts 12 mph19 km/h | 72% | 28% | 0 |
| Sat 12a | Mostly clear | 53°12° (likely 51°11° to 55°13°) | 53°12° | 0% | 6 mph10 km/h from SE, gusts 11 mph18 km/h | 77% | 42% | 0 |
| Sat 1a | Cloudy | 52°11° (likely 50°10° to 55°13°) | 52°11° | 0% | 6 mph10 km/h from SE, gusts 10 mph17 km/h | 77% | 70% | 0 |
| Sat 2a | Cloudy | 51°11° (likely 49°9° to 53°12°) | 51°11° | 0% | 6 mph10 km/h from SE, gusts 10 mph17 km/h | 80% | 81% | 0 |
| Sat 3a | Mostly clear | 50°10° (likely 48°9° to 53°12°) | 48°9° | 0% | 5 mph8 km/h from SE, gusts 11 mph18 km/h | 86% | 73% | 0 |
| Sat 4a | Cloudy | 49°9° (likely 47°8° to 52°11°) | 47°8° | 0% | 5 mph8 km/h from SE, gusts 10 mph16 km/h | 89% | 86% | 0 |
| Sat 5a | Cloudy | 48°9° (likely 47°8° to 51°11°) | 46°8° | 0% | 5 mph8 km/h from SE, gusts 9 mph15 km/h | 89% | 75% | 0 |
| Sat 6a | Mostly clear | 48°9° (likely 46°8° to 50°10°) | 46°8° | 0% | 5 mph8 km/h from SE, gusts 9 mph15 km/h | 89% | 75% | 0 |
| Sat 7a | Mostly sunny | 47°8° (likely 46°8° to 50°10°) | 45°7° | 0% | 5 mph8 km/h from SE, gusts 10 mph16 km/h | 93% | 73% | 0 |
| Sat 8a | Mostly sunny | 48°9° (likely 47°8° to 52°11°) | 46°8° | 0% | 5 mph8 km/h from SE, gusts 10 mph17 km/h | 93% | 79% | 0 |
| Sat 9a | Mostly sunny | 53°12° (likely 52°11° to 56°13°) | 53°12° | 0% | 6 mph10 km/h from SSE, gusts 11 mph18 km/h | 86% | 70% | 1 |
| Sat 10a | Cloudy | 61°16° (likely 59°15° to 61°16°) | 61°16° | 0% | 6 mph10 km/h from SSE, gusts 12 mph19 km/h | 70% | 76% | 2 |
| Sat 11a | Cloudy | 66°19° (likely 64°18° to 66°19°) | 66°19° | 0% | 7 mph11 km/h from SSE, gusts 12 mph20 km/h | 58% | 79% | 3 |
| Sat 12p | Cloudy | 69°21° (likely 68°20° to 70°21°) | 69°21° | 0% | 7 mph11 km/h from SSE, gusts 11 mph17 km/h | 51% | 78% | 4 |
| Sat 1p | Partly sunny | 72°22° (likely 71°22° to 73°23°) | 72°22° | 0% | 7 mph11 km/h from SSE, gusts 10 mph16 km/h | 46% | 71% | 4 |
| Sat 2p | Partly sunny | 73°23° (likely 72°22° to 74°23°) | 73°23° | 0% | 7 mph11 km/h from SSE, gusts 9 mph15 km/h | 43% | 64% | 4 |
| Sat 3p | Partly sunny | 74°23° (likely 72°22° to 74°23°) | 74°23° | 0% | 7 mph11 km/h from SSE, gusts 9 mph15 km/h | 40% | 58% | 3 |
| Sat 4p | Mostly sunny | 75°24° (likely 72°22° to 75°24°) | 75°24° | 0% | 7 mph11 km/h from SSE, gusts 9 mph15 km/h | 37% | 26% | 2 |
| Sat 5p | Partly sunny | 73°23° (likely 70°21° to 73°23°) | 73°23° | 0% | 6 mph10 km/h from SSE, gusts 9 mph14 km/h | 41% | 38% | 1 |
| Sat 6p | Partly cloudy | 70°21° (likely 65°18° to 70°21°) | 70°21° | 0% | 6 mph10 km/h from SE, gusts 9 mph14 km/h | 46% | 25% | 0 |
| Sat 7p | Partly cloudy | 65°18° (likely 60°16° to 65°18°) | 65°18° | 0% | 5 mph8 km/h from SE, gusts 10 mph16 km/h | 54% | 42% | 0 |
| Sat 8p | Partly cloudy | 60°16° (likely 58°14° to 61°16°) | 60°16° | 0% | 5 mph8 km/h from SE, gusts 10 mph17 km/h | 62% | 24% | 0 |
| Sat 9p | Partly cloudy | 58°14° (likely 56°13° to 59°15°) | 58°14° | 0% | 5 mph8 km/h from SE, gusts 11 mph18 km/h | 67% | 24% | 0 |
| Sat 10p | Clear | 56°13° (likely 55°13° to 57°14°) | 56°13° | 0% | 5 mph8 km/h from SE, gusts 12 mph19 km/h | 72% | 35% | 0 |
| Sat 11p | Clear | 55°13° (likely 54°12° to 55°13°) | 55°13° | 0% | 5 mph8 km/h from SSE, gusts 11 mph18 km/h | 72% | 43% | 0 |
| Sun 12a | Mostly clear | 53°12° (likely 53°12° to 54°12°) | 53°12° | 0% | 3 mph5 km/h from SSE, gusts 12 mph19 km/h | 77% | 48% | 0 |
| Sun 1a | Mostly clear | 52°11° (likely 51°11° to 53°12°) | 52°11° | 0% | 3 mph5 km/h from SSE, gusts 11 mph18 km/h | 77% | 46% | 0 |
| Sun 2a | Mostly clear | 51°11° (likely 50°10° to 52°11°) | 51°11° | 0% | 3 mph5 km/h from SSE, gusts 11 mph18 km/h | 80% | 49% | 0 |
| Sun 3a | Mostly clear | 50°10° (likely 50°10° to 51°11°) | 49°9° | 0% | 3 mph5 km/h from SSE, gusts 10 mph17 km/h | 83% | 43% | 0 |
| Sun 4a | Partly cloudy | 50°10° (likely 49°9° to 50°10°) | 49°9° | 0% | 3 mph5 km/h from SSE, gusts 9 mph15 km/h | 83% | 50% | 0 |
| Sun 5a | Partly cloudy | 49°9° (likely 48°9° to 50°10°) | 48°9° | 0% | 3 mph5 km/h from SSE, gusts 9 mph14 km/h | 83% | 58% | 0 |
| Sun 6a | Partly cloudy | 49°9° (likely 47°8° to 51°11°) | 48°9° | 0% | 3 mph5 km/h from SSE, gusts 8 mph13 km/h | 83% | 57% | 0 |
| Sun 7a | Partly sunny | 48°9° (likely 47°8° to 52°11°) | 47°8° | 0% | 3 mph5 km/h from SSE, gusts 8 mph12 km/h | 86% | 69% | 0 |
| Sun 8a | Partly sunny | 53°12° (likely 47°8° to 56°13°) | 53°12° | 0% | 2 mph3 km/h from SSE, gusts 7 mph11 km/h | 77% | 41% | 0 |
Days ahead
Tap a day for its hours and the official wording.
Today, Oct 23. Sunny. High 75°24°, low 47°8°. Dry. Forecasts agree.
Morning
6 AM–noon
Sunny, 66°19°Dry
Afternoon
noon–6 PM
Sunny, 75°24°Dry
Evening
6 PM–midnight
Clear, 60°16°Dry
Overnight
midnight–6 AM
Mostly clear, 48°9°Dry
Official NWS forecast
Today: Sunny, with a high near 75. Southeast wind around 7 mph.
Tonight: Mostly clear, with a low around 47. Southeast wind around 6 mph.
Forecasts agreeIndependent forecasts are close; the range is narrow.
- High, likely
- 73°23°–75°24°
- Low, likely
- 46°8°–49°9°
- Wind
- 9 mph14 km/h, gusts 19 mph31 km/h
- UV peak
- 4
Tomorrow, Oct 24. Cloudy. High 75°24°, low 48°9°. Dry. Forecasts agree.
Morning
6 AM–noon
Mostly sunny, 48°9°Dry
Afternoon
noon–6 PM
Partly sunny, 75°24°Dry
Evening
6 PM–midnight
Partly cloudy, 60°16°Dry
Overnight
midnight–6 AM
Mostly clear, 49°9°Dry
Official NWS forecast
Day: Mostly sunny, with a high near 75. Southeast wind around 7 mph.
Night: Partly cloudy, with a low around 48. Southeast wind around 6 mph.
Forecasts agreeIndependent forecasts are close; the range is narrow.
- High, likely
- 73°23°–75°24°
- Low, likely
- 46°8°–50°10°
- Wind
- 9 mph14 km/h, gusts 16 mph25 km/h
- UV peak
- 4
Sunday, Oct 25. Cloudy. High 77°25°, low 48°9°. Dry. Mostly agree.
Morning
6 AM–noon
Cloudy, 53°12°Dry
Afternoon
noon–6 PM
Cloudy, 76°25°Dry
Evening
6 PM–midnight
Cloudy, 63°17°Dry
Overnight
midnight–6 AM
Cloudy, 54°12°Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly sunny, with a high near 77. South wind around 3 mph.
Night: Partly cloudy, with a low around 48. South southeast wind around 2 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
- High, likely
- 75°24°–78°26°
- Low, likely
- 47°8°–50°10°
- Wind
- 8 mph13 km/h, gusts 16 mph26 km/h
- UV peak
- 4
Monday, Oct 26. Cloudy. High 76°24°, low 50°10°. Dry. Forecasts agree.
Morning
6 AM–noon
Cloudy, 54°12°Dry
Afternoon
noon–6 PM
Cloudy, 76°24°Dry
Evening
6 PM–midnight
Cloudy, 63°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 76. South wind 0 to 3 mph.
Night: Mostly cloudy, with a low around 50.
Forecasts agreeIndependent forecasts are close; the range is narrow.
- High, likely
- 74°23°–77°25°
- Low, likely
- 50°10°–56°13°
- Wind
- 7 mph12 km/h
- UV peak
- 3
Tuesday, Oct 27. Cloudy. High 74°23°, low 48°9°. Dry. Forecasts agree.
Morning
6 AM–noon
Cloudy, 55°13°Dry
Afternoon
noon–6 PM
Cloudy, 72°22°Dry
Evening
6 PM–midnight
Cloudy, 63°17°Dry
Overnight
midnight–6 AM
Partly cloudy, 55°13°Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Partly sunny, with a high near 74.
Night: Mostly cloudy, with a low around 48.
Forecasts agreeIndependent forecasts are close; the range is narrow.
- High, likely
- 72°22°–74°23°
- Low, likely
- 48°9°–56°13°
- Wind
- 9 mph15 km/h, gusts 22 mph35 km/h
- UV peak
- 3
Wednesday, Oct 28. Partly sunny. High 75°24°, low 50°10°. Dry. Forecasts agree.
Morning
6 AM–noon
Sunny, 56°13°Dry
Afternoon
noon–6 PM
Sunny, 74°24°Dry
Evening
6 PM–midnight
Clear, 63°17°Dry
Overnight
midnight–6 AM
Partly cloudy, 57°14°Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly sunny, with a high near 75.
Night: Mostly clear, with a low around 50.
Forecasts agreeIndependent forecasts are close; the range is narrow.
- High, likely
- 74°23°–75°24°
- Low, likely
- 50°10°–55°13°
- Wind
- 13 mph20 km/h, gusts 21 mph33 km/h
- UV peak
- 4
Thursday, Oct 29. Partly sunny. High 74°23°, low 48°9°. Dry. Forecasts differ.
Morning
6 AM–noon
Cloudy, 58°15°Dry
Afternoon
noon–6 PM
Cloudy, 72°22°Dry
Evening
6 PM–midnight
Clear, 59°15°Dry
Overnight
midnight–6 AM
Mostly clear, 45°7°Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly sunny, with a high near 74.
Night: A slight chance of rain showers after 1am. Partly cloudy, with a low around 48.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
- High, likely
- 68°20°–77°25°
- Low, likely
- 48°9°–57°14°
- Wind
- 14 mph23 km/h, gusts 32 mph51 km/h
- UV peak
- 3
Friday, Oct 30. Rain. High 64°18°, low 47°8°. Rain 0.15 in3.8 mm, 20% chance. Forecasts differ.
Morning
6 AM–noon
Drizzle, 47°9°Dry
Afternoon
noon–6 PM
Rain, 60°16°Dry
Evening
6 PM–midnight
Cloudy, 53°11°Dry
Overnight
midnight–6 AM
Drizzle, 48°9°Dry
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
- 55°13°–72°22°
- Low, likely
- 40°4°–54°12°
- Wind
- 11 mph17 km/h, gusts 22 mph35 km/h
Saturday, Oct 31. Drizzle. High 64°18°, low 50°10°. Rain 0.13 in3.3 mm, 30% chance. Forecasts differ.
Morning
6 AM–noon
Mostly sunny, 50°10°30% chance · 0.03 in0.7 mm
Afternoon
noon–6 PM
Cloudy, 62°17°30% chance
Evening
6 PM–midnight
Cloudy, 58°14°30% chance
Overnight
midnight–6 AM
Cloudy, 55°13°30% 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 differIndependent forecasts disagree; expect changes and plan for the range.
- High, likely
- 58°14°–68°20°
- Low, likely
- 44°7°–57°14°
- Wind
- 12 mph19 km/h, gusts 22 mph35 km/h
Sunday, Nov 1. Cloudy. High 67°19°, low 56°13°. Rain 0.19 in4.8 mm, 30% chance. Forecasts agree.
Morning
6 AM–noon
Cloudy, 56°13°30% chance · 0.02 in0.4 mm
Afternoon
noon–6 PM
Mostly sunny, 65°18°30% chance
Evening
6 PM–midnight
Cloudy, 60°15°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
- 66°19°–67°19°
- Low, likely
- 54°12°–58°14°
- Wind
- 13 mph21 km/h, gusts 26 mph42 km/h
- UV peak
- 4
The outlook
Today
Dry, high 75°, low 47°.
Tomorrow
Dry, high 75°, low 48°.
Sunday
Dry, high 77°, low 48°.
Rest of week
Mostly dry, highs 64–76°.
Want the meteorologists’ reasoning? Read the NWS forecast discussion (ILX) (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
Sangamon River at Decatur
15 mi- Level
- 1.9 ft
- Flow
- under 1 cfs
Reading from Fri 6:45 AM · NWS gauge page
Sangamon River at Riverton
16 mi- Level
- 2.2 ft
- Flow
- 92 cfs
Reading from Fri 7:45 AM · NWS gauge page
South Fork Sangamon River below Rochester - AUX
18 mi- Level
- 4.4 ft
Reading from Fri 7:30 AM · NWS gauge page
Sun & moon
Sun
Sunrise 7:15 AM, sunset 6:06 PM.
- Daylight
- 10 h 50 min
- Losing 2 min 30 s a day; shortest Dec 21, 1 h 29 min less
- Golden hour
- 5:28–6:23 PM
- Morning 6:59–7:53 AM
- Blue hour
- 6:23–6:33 PM
- Morning 6:48–6:59 AM; first light 6:48 AM
Stars tonight? Fair
Mostly clear 7–9 PM, but the moon is 95% lit and up.
Moon
Waxing gibbous
92% lit · growing
- Today
- sets 4:23 AM · rises 4:37 PM
- Full moon
- Oct 25
- New moon
- Nov 9
