Observed 7:15 AM CDT at KDKB

Cortland, IL weather

Clear and 48°9°, 12°7° warmer than a typical Oct 24.

Forecasts agree

Now 48°9°

Clear · Feels like 44°7°

Wind: 7 mph11 km/h; From the south-southeast. 58–10 mph16 km/h through 8 PM
Dew point: 43°6°; Comfortable
UV index: 0Low; Moderate 12–4 PM · peak 3
Air quality: 96Moderate; Main pollutant: PM2.5 (fine particles)
Pressure: 30.39 inHg1029 hPa; Rising slowly · +0.03 inHg+0.9 hPa in 3 h

No precipitation expected in the next 2 hours.

From forecast models

Next 48 hours

About the same as this time yesterday (49°10° then, 48°9° now)

Good hours for

Above 60°16° today by 11 AM
High 70°21° today at 3 PM
Below 60°16° tonight after 8 PM
Low 48°9° tomorrow at 6 AM

This morningUp to 62°17° by 11 AM · Mostly cloudy
This afternoonUp to 70°21° by 3 PM · Mostly cloudy
TonightDown to 49°9° by 4 AM · Mostly cloudy
Tomorrow morningUp to 64°18° by 11 AM · Cloudy
Tomorrow afternoonUp to 73°23° by 3 PM · Mostly cloudy
Tomorrow nightDown to 50°10° by 5 AM · Mostly cloudy

Hourly forecast, next 48 hours, in the place's local time
Hour	Conditions	Temperature	Feels like	Precipitation	Wind	Humidity	Cloud cover	UV index
Sat 8a	Mostly cloudy	49°9° (likely 48°9° to 50°10°)	46°8°	0%	5 mph8 km/h from SSE, gusts 11 mph17 km/h	87%	75%	0
Sat 9a	Mostly cloudy	54°12° (likely 52°11° to 54°12°)	54°12°	0%	10 mph16 km/h from SSE, gusts 12 mph20 km/h	76%	66%	1
Sat 10a	Cloudy	58°14° (likely 56°13° to 58°14°)	58°14°	0%	10 mph16 km/h from S, gusts 15 mph25 km/h	67%	75%	2
Sat 11a	Cloudy	62°17° (likely 60°16° to 62°17°)	62°17°	0%	10 mph16 km/h from S, gusts 16 mph25 km/h	59%	82%	2
Sat 12p	Cloudy	65°18° (likely 63°17° to 65°18°)	65°18°	5%	10 mph16 km/h from S, gusts 15 mph24 km/h	53%	76%	3
Sat 1p	Mostly cloudy	68°20° (likely 66°19° to 68°20°)	68°20°	5%	10 mph16 km/h from S, gusts 14 mph23 km/h	48%	62%	3
Sat 2p	Mostly cloudy	69°21° (likely 67°19° to 69°21°)	69°21°	5%	10 mph16 km/h from S, gusts 13 mph21 km/h	45%	69%	3
Sat 3p	Mostly cloudy	70°21° (likely 67°19° to 70°21°)	70°21°	5%	10 mph16 km/h from S, gusts 13 mph21 km/h	43%	54%	3
Sat 4p	Sunny	70°21° (likely 67°19° to 70°21°)	70°21°	5%	10 mph16 km/h from S, gusts 13 mph20 km/h	42%	48%	2
Sat 5p	Mostly cloudy	68°20° (likely 66°19° to 68°20°)	68°20°	5%	10 mph16 km/h from SSE, gusts 13 mph21 km/h	45%	54%	1
Sat 6p	Cloudy	64°18° (likely 62°17° to 64°18°)	65°18°	5%	5 mph8 km/h from SSE, gusts 11 mph17 km/h	51%	79%	0
Sat 7p	Cloudy	60°16° (likely 59°15° to 61°16°)	60°16°	5%	5 mph8 km/h from SSE, gusts 9 mph15 km/h	59%	67%	0
Sat 8p	Partly cloudy	58°14° (likely 57°14° to 59°15°)	58°14°	5%	5 mph8 km/h from SSE, gusts 11 mph17 km/h	66%	37%	0
Sat 9p	Clear	56°13° (likely 56°13° to 57°14°)	56°13°	5%	5 mph8 km/h from SSE, gusts 10 mph16 km/h	69%	16%	0
Sat 10p	Partly cloudy	55°13° (likely 54°12° to 56°13°)	55°13°	0%	5 mph8 km/h from S, gusts 9 mph15 km/h	72%	44%	0
Sat 11p	Partly cloudy	54°12° (likely 54°12° to 55°13°)	54°12°	0%	5 mph8 km/h from S, gusts 9 mph15 km/h	75%	62%	0
Sun 12a	Partly cloudy	53°12° (likely 53°12° to 55°13°)	53°12°	0%	5 mph8 km/h from S, gusts 11 mph17 km/h	77%	68%	0
Sun 1a	Partly cloudy	52°11° (likely 52°11° to 54°12°)	52°11°	5%	5 mph8 km/h from S, gusts 11 mph17 km/h	80%	66%	0
Sun 2a	Partly cloudy	51°11° (likely 51°11° to 53°12°)	48°9°	5%	5 mph8 km/h from S, gusts 11 mph18 km/h	83%	71%	0
Sun 3a	Partly cloudy	50°10° (likely 50°10° to 53°12°)	48°9°	5%	5 mph8 km/h from S, gusts 12 mph20 km/h	83%	71%	0
Sun 4a	Cloudy	49°9° (likely 49°9° to 53°12°)	46°8°	0%	5 mph8 km/h from S, gusts 13 mph20 km/h	86%	97%	0
Sun 5a	Cloudy	49°9° (likely 49°9° to 52°11°)	46°8°	0%	5 mph8 km/h from S, gusts 12 mph20 km/h	86%	91%	0
Sun 6a	Cloudy	48°9° (likely 48°9° to 52°11°)	45°7°	0%	5 mph8 km/h from S, gusts 10 mph16 km/h	88%	95%	0
Sun 7a	Cloudy	48°9° (likely 48°9° to 52°11°)	46°8°	0%	5 mph8 km/h from S, gusts 10 mph16 km/h	90%	95%	0
Sun 8a	Cloudy	50°10° (likely 49°9° to 52°11°)	47°8°	0%	5 mph8 km/h from S, gusts 10 mph16 km/h	88%	95%	0
Sun 9a	Cloudy	54°12° (likely 53°12° to 56°13°)	55°13°	0%	5 mph8 km/h from S, gusts 9 mph15 km/h	75%	88%	1
Sun 10a	Cloudy	59°15° (likely 57°14° to 60°16°)	59°15°	0%	5 mph8 km/h from S, gusts 11 mph18 km/h	65%	73%	2
Sun 11a	Cloudy	64°18° (likely 62°17° to 64°18°)	64°18°	0%	5 mph8 km/h from S, gusts 11 mph18 km/h	57%	71%	2
Sun 12p	Partly sunny	68°20° (likely 66°19° to 68°20°)	68°20°	0%	5 mph8 km/h from S, gusts 11 mph18 km/h	50%	71%	3
Sun 1p	Partly sunny	70°21° (likely 68°20° to 70°21°)	71°22°	0%	5 mph8 km/h from S, gusts 10 mph16 km/h	45%	72%	3
Sun 2p	Cloudy	72°22° (likely 70°21° to 72°22°)	72°22°	0%	5 mph8 km/h from S, gusts 10 mph16 km/h	43%	68%	3
Sun 3p	Partly sunny	73°23° (likely 70°21° to 73°23°)	73°23°	0%	5 mph8 km/h from S, gusts 10 mph16 km/h	41%	48%	3
Sun 4p	Cloudy	73°23° (likely 70°21° to 73°23°)	73°23°	0%	5 mph8 km/h from S, gusts 9 mph15 km/h	41%	65%	2
Sun 5p	Cloudy	71°22° (likely 68°20° to 71°22°)	71°22°	0%	5 mph8 km/h from S, gusts 7 mph11 km/h	44%	71%	1
Sun 6p	Partly cloudy	66°19° (likely 63°17° to 66°19°)	66°19°	0%	5 mph8 km/h from S, gusts 6 mph9 km/h	52%	75%	0
Sun 7p	Cloudy	62°17° (likely 60°16° to 62°17°)	62°17°	0%	5 mph8 km/h from S, gusts 7 mph12 km/h	59%	79%	0
Sun 8p	Cloudy	59°15° (likely 58°14° to 60°16°)	59°15°	0%	0 mph0 km/h, gusts 8 mph13 km/h	65%	80%	0
Sun 9p	Partly cloudy	58°14° (likely 57°14° to 59°15°)	58°14°	0%	0 mph0 km/h, gusts 7 mph12 km/h	67%	76%	0
Sun 10p	Mostly cloudy	56°13° (likely 56°13° to 58°14°)	57°14°	0%	0 mph0 km/h, gusts 7 mph12 km/h	71%	70%	0
Sun 11p	Cloudy	56°13° (likely 55°13° to 58°14°)	56°13°	0%	0 mph0 km/h, gusts 7 mph11 km/h	74%	74%	0
Mon 12a	Cloudy	55°13° (likely 54°12° to 57°14°)	55°13°	0%	0 mph0 km/h, gusts 8 mph13 km/h	77%	82%	0
Mon 1a	Cloudy	54°12° (likely 54°12° to 57°14°)	54°12°	0%	0 mph0 km/h, gusts 8 mph12 km/h	79%	83%	0
Mon 2a	Cloudy	53°12° (likely 53°12° to 56°13°)	53°12°	0%	0 mph0 km/h, gusts 3 mph5 km/h	82%	80%	0
Mon 3a	Mostly cloudy	52°11° (likely 52°11° to 56°13°)	52°11°	0%	0 mph0 km/h, gusts 3 mph5 km/h	85%	77%	0
Mon 4a	Mostly cloudy	51°11° (likely 51°11° to 55°13°)	51°11°	0%	0 mph0 km/h, gusts 3 mph5 km/h	88%	80%	0
Mon 5a	Mostly cloudy	50°10° (likely 50°10° to 55°13°)	50°10°	0%	5 mph8 km/h from N, gusts 4 mph6 km/h	92%	79%	0
Mon 6a	Cloudy	49°9° (likely 49°9° to 55°13°)	48°9°	0%	5 mph8 km/h from NNE, gusts 6 mph9 km/h	95%	81%	0
Mon 7a	Cloudy	50°10° (likely 48°9° to 55°13°)	48°9°	0%	5 mph8 km/h from NE, gusts 8 mph13 km/h	95%	76%	0

Days ahead

Shaded: typical range for these dates (1991–2020)

Today, Oct 24. Cloudy. High 70°21°, low 48°9°. Typical 58°14° / 38°3°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Cloudy, 49°9°
  Dry
2. Afternoon
  noon–6 PM
  Mostly cloudy, 70°21°
  Dry
3. Evening
  6 PM–midnight
  Clear, 58°14°
  Dry
4. Overnight
  midnight–6 AM
  Partly cloudy, 49°9°
  Dry
Official NWS forecast
Today: Partly sunny. High near 70, with temperatures falling to around 68 in the afternoon. South southeast wind 5 to 10 mph.
Tonight: Partly cloudy, with a low around 48. South southeast wind around 5 mph, with gusts as high as 15 mph.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
67°19°–70°21°
Low, likely
47°8°–49°9°
Typical high / low
58°14° / 38°3°
Wind
10 mph17 km/h, gusts 20 mph32 km/h
UV peak
3
Tomorrow, Oct 25. Cloudy. High 73°23°, low 49°9°. Typical 58°14° / 38°3°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Cloudy, 50°10°
  Dry
2. Afternoon
  noon–6 PM
  Partly sunny, 73°23°
  Dry
3. Evening
  6 PM–midnight
  Partly cloudy, 59°15°
  Dry
4. Overnight
  midnight–6 AM
  Mostly cloudy, 50°10°
  Dry
Official NWS forecast
Day: Partly sunny. High near 73, with temperatures falling to around 71 in the afternoon. South wind around 5 mph, with gusts as high as 10 mph.
Night: Mostly cloudy, with a low around 49. South southwest wind 0 to 5 mph.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
70°21°–73°23°
Low, likely
49°9°–51°11°
Typical high / low
58°14° / 38°3°
Wind
8 mph13 km/h, gusts 18 mph29 km/h
UV peak
3
Monday, Oct 26. Mostly cloudy. High 67°19°, low 46°8°. Typical 57°14° / 37°3°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Cloudy, 52°11°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 67°19°
  Dry
3. Evening
  6 PM–midnight
  Mostly clear, 54°12°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 51°10°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Partly sunny, with a high near 67. Northeast wind 5 to 10 mph, with gusts as high as 20 mph.
Night: Mostly cloudy, with a low around 46.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
65°18°–69°21°
Low, likely
46°8°–51°11°
Typical high / low
57°14° / 37°3°
Wind
12 mph19 km/h, gusts 20 mph32 km/h
UV peak
3
Tuesday, Oct 27. Mostly cloudy. High 67°19°, low 50°10°. Typical 56°13° / 37°3°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Cloudy, 51°11°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 68°20°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 61°16°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 55°13°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly cloudy, with a high near 67.
Night: Mostly cloudy, with a low around 50.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
65°18°–70°21°
Low, likely
49°9°–51°11°
Typical high / low
56°13° / 37°3°
Wind
12 mph19 km/h, gusts 28 mph44 km/h
UV peak
3
Wednesday, Oct 28. Partly sunny. High 72°22°, low 51°11°. Typical 56°13° / 37°3°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 55°13°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 71°22°
  Dry
3. Evening
  6 PM–midnight
  Partly cloudy, 63°17°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 58°15°
  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 51.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
69°21°–73°23°
Low, likely
51°11°–55°13°
Typical high / low
56°13° / 37°3°
Wind
13 mph22 km/h, gusts 29 mph47 km/h
UV peak
4
Thursday, Oct 29. Partly sunny. High 69°21°, low 46°8°. Typical 56°13° / 36°2°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Partly sunny, 59°15°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 70°21°
  Dry
3. Evening
  6 PM–midnight
  Partly cloudy, 61°16°
  Dry
4. 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 69.
Night: A slight chance of rain showers after 1am. Partly cloudy, with a low around 46.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
67°19°–73°23°
Low, likely
46°8°–58°14°
Typical high / low
56°13° / 36°2°
Wind
11 mph18 km/h, gusts 33 mph53 km/h
UV peak
3
Friday, Oct 30. Showers. High 67°19°, low 47°8°. Typical 55°13° / 36°2°. Rain 0.01 in0.3 mm, 20% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Mostly sunny, 54°12°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 68°20°
  Dry
3. Evening
  6 PM–midnight
  Mostly clear, 60°15°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 55°13°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: A slight chance of rain showers. Partly sunny, with a high near 67.
Night: A chance of rain showers. Mostly cloudy, with a low around 47.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
62°17°–76°24°
Low, likely
44°7°–58°14°
Typical high / low
55°13° / 36°2°
Wind
13 mph21 km/h, gusts 23 mph37 km/h
UV peak
2
Saturday, Oct 31. Drizzle. High 69°21°, low 55°13°. Typical 54°12° / 36°2°. Rain 0.1 in2.5 mm, 40% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Cloudy, 56°13°
  20% chance
2. Afternoon
  noon–6 PM
  Drizzle, 69°21°
  30% chance
3. Evening
  6 PM–midnight
  Drizzle, 63°17°
  40% chance · 0.03 in0.8 mm
4. Overnight
  midnight–6 AM
  Drizzle, 60°15°
  50% chance · 0.03 in0.8 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.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
64°18°–76°24°
Low, likely
52°11°–59°15°
Typical high / low
54°12° / 36°2°
Wind
14 mph23 km/h, gusts 27 mph44 km/h
UV peak
3
Sunday, Nov 1. Showers. High 65°18°, low 58°14°. Typical 54°12° / 35°2°. Rain 0.58 in15 mm, 50% chance. Forecasts agree.
1. Morning
  6 AM–noon
  Drizzle, 60°16°
  50% chance · 0.12 in3.1 mm
2. Afternoon
  noon–6 PM
  Drizzle, 63°17°
  40% chance · 0.28 in7 mm
3. Evening
  6 PM–midnight
  Showers, 61°16°
  40% chance · 0.13 in3.4 mm
4. Overnight
  midnight–6 AM
  Drizzle, 58°14°
  40% chance · 0.01 in0.4 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 agreeIndependent forecasts are close; the range is narrow.
High, likely
63°17°–66°19°
Low, likely
56°13°–60°16°
Typical high / low
54°12° / 35°2°
Wind
28 mph45 km/h, gusts 43 mph69 km/h
UV peak
2
Monday, Nov 2. Drizzle. High 62°17°, low 54°12°. Typical 53°12° / 35°2°. Rain 0.47 in12 mm, 40% chance. Mostly agree.
1. Morning
  6 AM–noon
  Drizzle, 57°14°
  30% chance · 0.04 in1.1 mm
2. Afternoon
  noon–6 PM
  Drizzle, 58°14°
  30% chance · 0.32 in8.2 mm
3. Evening
  6 PM–midnight
  Cloudy, 57°14°
  30% chance · 0.1 in2.5 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
59°15°–65°18°
Low, likely
47°8°–61°16°
Typical high / low
53°12° / 35°2°
Wind
22 mph36 km/h, gusts 41 mph66 km/h
UV peak
2

10 days15 days30 days

The outlook

Today
Dry, high 70°, low 48°.
Tomorrow
Dry, high 73°, low 49°, warming up.
Monday
Dry, high 67°, low 46°, cooling off.
Rest of week
Highs 62–72°; chance of precipitation on Saturday, 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

Full-screen radar

Rivers

NOAA river gauges within 25 mi

South Branch Kishwaukee River at De Kalb

3.6 mi

Below flood stage

Level: 3.5 ft
Flow: 55 cfs

Reading from Sat 6:30 AM · NWS gauge page

South Branch Kishwaukee River near Fairdale

16 mi

Below flood stage

Level: 2.4 ft
Flow: 94 cfs

Reading from Sat 5:45 AM · NWS gauge page

Ferson Creek near St Charles

18 mi

Below flood stage

Level: 1.8 ft
Flow: 30 cfs

Reading from Sat 6:15 AM · NWS gauge page

Mill Creek (IL) at Batavia

19 mi

Below flood stage

Level: 2.3 ft
Flow: 5 cfs

Reading from Sat 6 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 15Typical 128

Heating degree days, base 65°F

Comfort

Dry air outside (dew point 43°F).

Open the windows?

Today, 11:00 AM–7:00 PM

Good stretch to open the windows.

Is this typical?

DE KALB · official normals 1991–2020 · records 1966–2026

Oct 24, today vs a typical year

Today’s expected high is 12°7° warmer than typical.

Last 7 days vs normal

On average 1° warmer than normal (daily mean temperature).

−13°−7°SunOct 18
+1°±0°MonOct 19
−1°TueOct 20
+8°+4°WedOct 21
—ThuOct 22
+11°+6°FriOct 23
—SatOct 24

Cortland weather by month: normals, records, snow and freeze dates

Sun & moon

Sun

Daylight: 10 h 42 min; Losing 2 min 35 s a day; shortest Dec 21, 1 h 34 min less
Golden hour: 5:20–6:16 PM; Morning 7:00–7:56 AM
Blue hour: 6:16–6:28 PM; Morning 6:49–7:00 AM; first light 6:49 AM

Stars tonight? Poor

Clouds most of the night (about 67% cover).

Moon

Waxing gibbous

97% lit · growing

Today: sets 5:30 AM · rises 4:57 PM
Full moon: Oct 25
New moon: Nov 9

Looking west from Cortland. A level horizon.Skyline from USGS elevation data, heights drawn up to 6× taller. Sky, sun and moon as they are now.

Cortland, IL weather

Next 2 hours

Next 48 hours

Days ahead

The outlook

Today

Tomorrow

Monday

Rest of week

What changed since yesterday

Radar

Rivers

South Branch Kishwaukee River at De Kalb

South Branch Kishwaukee River near Fairdale

Ferson Creek near St Charles

Mill Creek (IL) at Batavia

For your home

Heating this week

Comfort

Open the windows?

Is this typical?

Oct 24, today vs a typical year

Last 7 days vs normal

Sun & moon

Sun

Stars tonight? Poor

Moon