Kaskaskia River at Cooks Mills
13 mi- Level
- 1.4 ft
- Flow
- 16 cfs
Reading from Sat 4:30 PM · NWS gauge page
Observed 5:20 PM CDT at KMTO
Lerna, IL weather
Sunny and 70°21°, 8°4° warmer than a typical Oct 24, jacket by 9 PM.
Today: low 46°8° (likely 45°7° to 47°8°), high 73°23° (likely 71°22° to 73°23°).
Now 70°21°
Sunny
- Wind
- 7 mph11 km/h
- From the east. Up to 7 mph11 km/h through 5 AM
- Dew point
- 45°7°
- Comfortable
- UV tomorrow
- 4Moderate
- Moderate 11 AM–4 PM · peak 4
- Pressure
- 30.35 inHg1028 hPa
- Steady over the last 3 h
Next 2 hours
No precipitation expected in the next 2 hours.
From forecast models
Next 48 hours
Good hours for
TonightDown to 47°8° by 5 AM · Partly cloudy
Tomorrow morningUp to 67°19° by 11 AM · Partly cloudy
Tomorrow afternoonUp to 75°24° by 2 PM · Partly cloudy
Tomorrow nightDown to 49°9° by 4 AM · Mostly cloudy
Monday morningUp to 69°21° by 11 AM · Mostly cloudy
Monday afternoonUp to 77°25° by 3 PM · Mostly cloudy
| Hour | Conditions | Temperature | Feels like | Precipitation | Wind | Humidity | Cloud cover | UV index |
|---|---|---|---|---|---|---|---|---|
| Sat 5p | Sunny | 71°22° (likely 67°19° to 71°22°) | 71°22° | 0% | 5 mph8 km/h from SE, gusts 8 mph13 km/h | 38% | 38% | 0 |
| Sat 6p | Partly cloudy | 67°19° (likely 62°17° to 67°19°) | 67°19° | 0% | 3 mph5 km/h from ESE, gusts 8 mph13 km/h | 44% | 34% | 0 |
| Sat 7p | Mostly clear | 61°16° (likely 59°15° to 62°17°) | 61°16° | 0% | 2 mph3 km/h from ESE, gusts 8 mph13 km/h | 56% | 26% | 0 |
| Sat 8p | Partly cloudy | 58°14° (likely 57°14° to 60°16°) | 58°14° | 0% | 3 mph5 km/h from ESE, gusts 9 mph14 km/h | 65% | 46% | 0 |
| Sat 9p | Clear | 55°13° (likely 54°12° to 59°15°) | 55°13° | 0% | 3 mph5 km/h from ESE, gusts 9 mph15 km/h | 74% | 43% | 0 |
| Sat 10p | Clear | 54°12° (likely 53°12° to 57°14°) | 54°12° | 0% | 3 mph5 km/h from ESE, gusts 9 mph14 km/h | 76% | 40% | 0 |
| Sat 11p | Clear | 52°11° (likely 51°11° to 56°13°) | 52°11° | 0% | 3 mph5 km/h from ESE, gusts 9 mph14 km/h | 80% | 40% | 0 |
| Sun 12a | Clear | 51°11° (likely 50°10° to 55°13°) | 51°11° | 0% | 2 mph3 km/h from ESE, gusts 8 mph12 km/h | 83% | 10% | 0 |
| Sun 1a | Clear | 50°10° (likely 49°9° to 54°12°) | 50°10° | 0% | 2 mph3 km/h from SE, gusts 9 mph14 km/h | 85% | 0% | 0 |
| Sun 2a | Clear | 49°9° (likely 48°9° to 53°12°) | 49°9° | 0% | 2 mph3 km/h from SE, gusts 8 mph13 km/h | 86% | 13% | 0 |
| Sun 3a | Clear | 48°9° (likely 47°8° to 52°11°) | 48°9° | 0% | 2 mph3 km/h from SE, gusts 9 mph14 km/h | 89% | 2% | 0 |
| Sun 4a | Mostly clear | 48°9° (likely 46°8° to 51°11°) | 47°8° | 0% | 3 mph5 km/h from SE, gusts 9 mph14 km/h | 89% | 54% | 0 |
| Sun 5a | Mostly clear | 47°8° (likely 46°8° to 50°10°) | 46°8° | 0% | 3 mph5 km/h from SE, gusts 7 mph12 km/h | 90% | 47% | 0 |
| Sun 6a | Mostly clear | 46°8° (likely 45°7° to 49°9°) | 45°7° | 0% | 3 mph5 km/h from SE, gusts 7 mph11 km/h | 93% | 40% | 0 |
| Sun 7a | Mostly sunny | 46°8° (likely 45°7° to 49°9°) | 46°8° | 0% | 2 mph3 km/h from SE, gusts 6 mph10 km/h | 92% | 59% | 0 |
| Sun 8a | Cloudy | 48°9° (likely 45°7° to 50°10°) | 47°8° | 0% | 3 mph5 km/h from SE, gusts 6 mph10 km/h | 91% | 79% | 0 |
| Sun 9a | Mostly sunny | 56°13° (likely 52°11° to 56°13°) | 56°13° | 0% | 3 mph5 km/h from SE, gusts 6 mph9 km/h | 75% | 67% | 1 |
| Sun 10a | Partly sunny | 62°17° (likely 59°15° to 62°17°) | 62°17° | 0% | 3 mph5 km/h from SSE, gusts 7 mph12 km/h | 61% | 53% | 2 |
| Sun 11a | Mostly sunny | 67°19° (likely 64°18° to 67°19°) | 67°19° | 0% | 3 mph5 km/h from S, gusts 7 mph11 km/h | 50% | 44% | 3 |
| Sun 12p | Mostly sunny | 71°22° (likely 68°20° to 71°22°) | 71°22° | 0% | 3 mph5 km/h from SSE, gusts 6 mph10 km/h | 42% | 24% | 4 |
| Sun 1p | Mostly sunny | 73°23° (likely 71°22° to 73°23°) | 73°23° | 0% | 2 mph3 km/h from SSE, gusts 6 mph9 km/h | 38% | 35% | 4 |
| Sun 2p | Partly sunny | 75°24° (likely 72°22° to 75°24°) | 75°24° | 0% | 2 mph3 km/h from SSE, gusts 5 mph8 km/h | 35% | 54% | 4 |
| Sun 3p | Partly sunny | 75°24° (likely 72°22° to 75°24°) | 75°24° | 0% | 3 mph5 km/h from SSE, gusts 5 mph9 km/h | 34% | 58% | 3 |
| Sun 4p | Cloudy | 75°24° (likely 71°22° to 75°24°) | 75°24° | 0% | 3 mph5 km/h from SSE, gusts 6 mph9 km/h | 34% | 67% | 2 |
| Sun 5p | Cloudy | 74°23° (likely 69°21° to 74°23°) | 74°23° | 0% | 2 mph3 km/h from SSE, gusts 5 mph8 km/h | 36% | 73% | 1 |
| Sun 6p | Mostly clear | 69°21° (likely 64°18° to 69°21°) | 69°21° | 0% | 1 mph2 km/h from SE, gusts 6 mph9 km/h | 44% | 44% | 0 |
| Sun 7p | Mostly clear | 64°18° (likely 62°17° to 65°18°) | 64°18° | 0% | 1 mph2 km/h from SE, gusts 6 mph9 km/h | 54% | 46% | 0 |
| Sun 8p | Cloudy | 59°15° (likely 59°15° to 63°17°) | 59°15° | 0% | 1 mph2 km/h from SE, gusts 6 mph10 km/h | 65% | 81% | 0 |
| Sun 9p | Partly cloudy | 57°14° (likely 57°14° to 60°16°) | 57°14° | 0% | 1 mph2 km/h from SE, gusts 7 mph12 km/h | 70% | 75% | 0 |
| Sun 10p | Cloudy | 55°13° (likely 55°13° to 59°15°) | 55°13° | 0% | 1 mph2 km/h from SE, gusts 8 mph13 km/h | 75% | 76% | 0 |
| Sun 11p | Cloudy | 54°12° (likely 54°12° to 58°14°) | 54°12° | 0% | 1 mph2 km/h from SE, gusts 7 mph12 km/h | 77% | 68% | 0 |
| Mon 12a | Cloudy | 53°12° (likely 53°12° to 57°14°) | 53°12° | 0% | 1 mph2 km/h from SE, gusts 8 mph12 km/h | 79% | 80% | 0 |
| Mon 1a | Cloudy | 52°11° (likely 52°11° to 56°13°) | 52°11° | 0% | 1 mph2 km/h from SE, gusts 8 mph12 km/h | 80% | 81% | 0 |
| Mon 2a | Cloudy | 51°11° (likely 51°11° to 55°13°) | 51°11° | 0% | 1 mph2 km/h from SE, gusts 7 mph11 km/h | 83% | 80% | 0 |
| Mon 3a | Partly cloudy | 50°10° (likely 50°10° to 54°12°) | 50°10° | 0% | 1 mph2 km/h from SSE, gusts 9 mph14 km/h | 86% | 74% | 0 |
| Mon 4a | Cloudy | 49°9° (likely 49°9° to 54°12°) | 49°9° | 0% | 1 mph2 km/h from SSE, gusts 9 mph14 km/h | 89% | 79% | 0 |
| Mon 5a | Cloudy | 49°9° (likely 49°9° to 53°12°) | 49°9° | 0% | 1 mph2 km/h from SSE, gusts 8 mph13 km/h | 88% | 83% | 0 |
| Mon 6a | Cloudy | 48°9° (likely 48°9° to 52°11°) | 48°9° | 0% | 1 mph2 km/h from SSE, gusts 8 mph13 km/h | 91% | 87% | 0 |
| Mon 7a | Cloudy | 48°9° (likely 48°9° to 52°11°) | 48°9° | 0% | 0 mph0 km/h, gusts 9 mph14 km/h | 90% | 85% | 0 |
| Mon 8a | Cloudy | 50°10° (likely 49°9° to 54°12°) | 50°10° | 0% | 1 mph2 km/h from SSE, gusts 8 mph13 km/h | 90% | 79% | 0 |
| Mon 9a | Mostly sunny | 56°13° (likely 55°13° to 59°15°) | 56°13° | 0% | 1 mph2 km/h from S, gusts 8 mph13 km/h | 77% | 77% | 1 |
| Mon 10a | Partly sunny | 64°18° (likely 62°17° to 65°18°) | 64°18° | 0% | 1 mph2 km/h from S, gusts 10 mph15 km/h | 60% | 73% | 2 |
| Mon 11a | Partly sunny | 69°21° (likely 67°19° to 70°21°) | 69°21° | 0% | 1 mph2 km/h from S, gusts 9 mph14 km/h | 51% | 75% | 3 |
| Mon 12p | Cloudy | 72°22° (likely 71°22° to 73°23°) | 72°22° | 0% | 2 mph3 km/h from SSW, gusts 8 mph13 km/h | 44% | 78% | 3 |
| Mon 1p | Cloudy | 74°23° (likely 73°23° to 75°24°) | 74°23° | 0% | 2 mph3 km/h from SSW, gusts 8 mph13 km/h | 40% | 85% | 3 |
| Mon 2p | Cloudy | 76°24° (likely 73°23° to 77°25°) | 76°24° | 0% | 2 mph3 km/h from SSW, gusts 8 mph12 km/h | 36% | 78% | 4 |
| Mon 3p | Cloudy | 77°25° (likely 74°23° to 77°25°) | 77°25° | 0% | 2 mph3 km/h from SSW, gusts 7 mph12 km/h | 35% | 85% | 3 |
| Mon 4p | Partly sunny | 76°24° (likely 72°22° to 77°25°) | 76°24° | 0% | 2 mph3 km/h from SSW, gusts 7 mph12 km/h | 36% | 79% | 2 |
Days ahead
Shaded: typical range for these dates (1991–2020)
Today, Oct 24. Cloudy. High 73°23°, low 46°8°. Typical 65°18° / 43°6°. Dry. Forecasts agree.
Evening
6 PM–midnight
Clear, 58°14°Dry
Overnight
midnight–6 AM
Clear, 47°8°Dry
Official NWS forecast
Today: Mostly sunny, with a high near 73. Southeast wind around 5 mph.
Tonight: Mostly clear, with a low around 46. Southeast wind around 3 mph.
Forecasts agreeIndependent forecasts are close; the range is narrow.
- High, likely
- 71°22°–73°23°
- Low, likely
- 45°7°–47°8°
- Typical high / low
- 65°18° / 43°6°
- Wind
- 8 mph14 km/h, gusts 13 mph22 km/h
- UV peak
- 4
Tomorrow, Oct 25. Cloudy. High 75°24°, low 48°9°. Typical 65°18° / 42°6°. Dry. Mostly 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, 59°15°Dry
Overnight
midnight–6 AM
Partly cloudy, 49°9°Dry
Official NWS forecast
Day: Sunny, with a high near 75. South southeast wind around 3 mph.
Night: Partly cloudy, with a low around 48. Southeast wind around 1 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
- High, likely
- 72°22°–75°24°
- Low, likely
- 45°7°–49°9°
- Typical high / low
- 65°18° / 42°6°
- Wind
- 8 mph12 km/h, gusts 13 mph21 km/h
- UV peak
- 4
Monday, Oct 26. Partly sunny. High 77°25°, low 49°9°. Typical 64°18° / 42°6°. Dry. Mostly agree.
Morning
6 AM–noon
Mostly sunny, 50°10°Dry
Afternoon
noon–6 PM
Cloudy, 77°25°Dry
Evening
6 PM–midnight
Cloudy, 62°16°Dry
Overnight
midnight–6 AM
Cloudy, 52°11°Dry
Official NWS forecast
Day: Mostly sunny, with a high near 77. South wind around 2 mph.
Night: Partly cloudy, with a low around 49. South southeast wind around 2 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
- High, likely
- 73°23°–77°25°
- Low, likely
- 49°9°–52°11°
- Typical high / low
- 64°18° / 42°6°
- Wind
- 8 mph12 km/h, gusts 14 mph23 km/h
- UV peak
- 4
Tuesday, Oct 27. Cloudy. High 74°23°, low 51°11°. Typical 64°18° / 42°6°. Dry. Mostly agree.
Morning
6 AM–noon
Cloudy, 52°11°Dry
Afternoon
noon–6 PM
Cloudy, 72°22°Dry
Evening
6 PM–midnight
Cloudy, 61°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 74. South southeast wind around 5 mph.
Night: Mostly cloudy, with a low around 51.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
- High, likely
- 70°21°–74°23°
- Low, likely
- 49°9°–54°12°
- Typical high / low
- 64°18° / 42°6°
- Wind
- 8 mph13 km/h, gusts 17 mph27 km/h
- UV peak
- 4
Wednesday, Oct 28. Partly sunny. High 78°26°, low 52°11°. Typical 63°17° / 41°5°. Dry. Mostly agree.
Morning
6 AM–noon
Sunny, 54°12°Dry
Afternoon
noon–6 PM
Sunny, 76°24°Dry
Evening
6 PM–midnight
Mostly clear, 63°17°Dry
Overnight
midnight–6 AM
Clear, 54°12°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 52.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
- High, likely
- 73°23°–78°26°
- Low, likely
- 49°9°–53°12°
- Typical high / low
- 63°17° / 41°5°
- Wind
- 11 mph18 km/h, gusts 21 mph33 km/h
- UV peak
- 4
Thursday, Oct 29. Mostly sunny. High 80°27°, low 52°11°. Typical 63°17° / 41°5°. Dry. Mostly agree.
Morning
6 AM–noon
Sunny, 56°13°Dry
Afternoon
noon–6 PM
Sunny, 78°26°Dry
Evening
6 PM–midnight
Clear, 65°18°Dry
Overnight
midnight–6 AM
Mostly clear, 54°12°Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Sunny, with a high near 80.
Night: Mostly clear, with a low around 52.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
- High, likely
- 76°24°–80°27°
- Low, likely
- 49°9°–56°13°
- Typical high / low
- 63°17° / 41°5°
- Wind
- 14 mph22 km/h, gusts 24 mph38 km/h
- UV peak
- 4
Friday, Oct 30. Mostly sunny. High 79°26°, low 55°13°. Typical 62°17° / 41°5°. Dry. Mostly agree.
Morning
6 AM–noon
Sunny, 56°13°Dry
Afternoon
noon–6 PM
Partly sunny, 77°25°Dry
Evening
6 PM–midnight
Cloudy, 64°18°Dry
Overnight
midnight–6 AM
Cloudy, 57°14°Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Sunny, with a high near 79.
Night: Mostly cloudy, with a low around 55.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
- High, likely
- 74°23°–79°26°
- Low, likely
- 50°10°–56°13°
- Typical high / low
- 62°17° / 41°5°
- Wind
- 12 mph20 km/h, gusts 24 mph39 km/h
- UV peak
- 4
Saturday, Oct 31. Drizzle. High 71°22°, low 58°14°. Typical 62°17° / 40°4°. Rain 0.06 in1.5 mm, 50% chance. Forecasts differ.
Morning
6 AM–noon
Cloudy, 58°14°30% chance
Afternoon
noon–6 PM
Cloudy, 72°22°40% chance
Evening
6 PM–midnight
Drizzle, 65°19°50% chance · 0.04 in1 mm
Overnight
midnight–6 AM
Drizzle, 62°16°50% chance · 0.13 in3.4 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
- 55°13°–63°17°
- Typical high / low
- 62°17° / 40°4°
- Wind
- 15 mph24 km/h, gusts 26 mph41 km/h
- UV peak
- 2
Sunday, Nov 1. Showers. High 72°22°, low 60°16°. Typical 61°16° / 40°4°. Rain 0.51 in13 mm, 50% chance. Forecasts differ.
Morning
6 AM–noon
Drizzle, 65°18°50% chance · 0.04 in1.1 mm
Afternoon
noon–6 PM
Drizzle, 73°23°40% chance · 0.02 in0.5 mm
Evening
6 PM–midnight
Showers, 66°19°30% chance · 0.34 in8.6 mm
Overnight
midnight–6 AM
Drizzle, 52°11°30% chance · 0.11 in2.7 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
- 70°21°–78°26°
- Low, likely
- 58°14°–63°17°
- Typical high / low
- 61°16° / 40°4°
- Wind
- 22 mph36 km/h, gusts 38 mph61 km/h
- UV peak
- 3
Monday, Nov 2. Rain. High 66°19°, low 51°11°. Typical 61°16° / 40°4°. Rain 0.36 in9.1 mm, 40% chance. Forecasts differ.
Morning
6 AM–noon
Drizzle, 50°10°40% chance · 0.11 in2.8 mm
Afternoon
noon–6 PM
Drizzle, 54°12°40% chance · 0.03 in0.8 mm
Evening
6 PM–midnight
Rain, 51°11°30% chance · 0.09 in2.3 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
- 58°14°–74°23°
- Low, likely
- 37°3°–63°17°
- Typical high / low
- 61°16° / 40°4°
- Wind
- 21 mph34 km/h, gusts 39 mph62 km/h
The outlook
Today
Dry, high 73°, low 46°.
Tomorrow
Dry, high 75°, low 48°.
Monday
Dry, high 77°, low 49°.
Rest of week
Highs 66–80°; chance of precipitation on Saturday, Sunday.
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
Whitley Creek near Allenville
14 mi- Level
- 2.2 ft
Reading from Sat 4:30 PM · NWS gauge page
For your home
What this week’s weather means for heating, cooling, pipes and fresh air.
Heating this week
About 81% less heating than a typical week.
This week 16Typical 86
Heating degree days, base 65°F
Heat-pump hours, next 7 days
- h below 47°F
- 3
- h below 17°F
- 0
- h below 5°F
- 0
47, 17 and 5°F are the test points heat pumps are rated at.
Comfort
Dry air outside (dew point 45°F).
Open the windows?
Today, 6:00 PM–7:00 PM
Good stretch to open the windows (air quality forecast not available for part of this window).
Is this typical?
CHARLESTON · official normals 1991–2020 · records 1896–2026
Oct 24, today vs a typical year
Today’s expected high is 8°4° warmer than typical.
- Normal high / low
- 65°18° / 43°6°
- Forecast high / low
- 73°23° / 46°8°
- Record high
- 83°28° in 1927
- Record low
- 20°−7° in 1981
Last 7 days vs normal
On average 1° warmer than normal (daily mean temperature).
- −6°−3°SunOct 18
- −1°MonOct 19
- +2°+1°TueOct 20
- ±0°WedOct 21
- +6°+3°ThuOct 22
- +5°+3°FriOct 23
- —SatOct 24
Lerna weather by month: normals, records, snow and freeze dates
Sun & moon
Sun
Sunrise 7:12 AM, sunset 6:01 PM.
- Daylight
- 10 h 49 min
- Losing 2 min 16 s a day; shortest Dec 21, 1 h 26 min less
- Golden hour
- 5:24–6:18 PM
- Morning 6:55–7:49 AM
- Blue hour
- 6:18–6:28 PM
- Morning 6:45–6:55 AM; first light 6:45 AM
Stars tonight? Fair
Mostly clear 12–4 AM, but the moon is 99% lit and up.
Moon
Waxing gibbous
98% lit · growing
- Today
- sets 5:26 AM · rises 4:58 PM
- Full moon
- Oct 25
- New moon
- Nov 9
