As of 23:22 CDT

Weather in Sycamore, IL

58°

Sycamore, Wednesday, 7 October, 23:22

Clear. Feels like 57°. High 77°, low 55°.

Pressure29.94 inHg

Wind3 mph NW

Humidity64%

Visibility6.2 mi

Dew point46°

See detailed hourly forecast

Monthly outlook for Sycamore, IL: average high 67.5°, average low 49.5°. That is 3.4° above the climate normal for October. Precipitation is expected on 3 days (about 0.5 inches), against a normal of 5 days and 1.6 inches. The warmest day looks like 15 October (83.3°), the coolest 21 October (37.2°).

67.5°/49.5°

Average high / low

+3.4°

Above normal

3 / 5

Wet days / normal

0.5 in

Precipitation this month

Ten-day blocks vs climate normal

Period	Forecast high	Normal	Difference
7 October – 16 October	73.8°	62.7°	+6.2°
17 October – 26 October	57°	58.3°	-0.7°
27 October – 5 November	at normal	54.2°	—

October records over 66 years

87.1°3 October 2025All-time high

22.1°24 October 1981All-time low

Thu, 0870° / 51°

70 °

Sycamore, Thursday, 8 October

Overcast. High 70°, low 51°.

Pressure30.09 inHg

Wind7 mph NW

Humidity44%

Visibility6.2 mi

Dew point42°

Fri, 0976° / 50°

0.24

76 °

Sycamore, Friday, 9 October

Heavy rain. High 76°, low 50°.

Pressure30.12 inHg

Wind11.2 mph SE

Humidity52%

Visibility6.2 mi

Dew point52°

Sat, 1080° / 60°

80 °

Sycamore, Saturday, 10 October

Clear. High 80°, low 60°.

Pressure30.12 inHg

Wind9.7 mph S

Humidity53%

Visibility6.2 mi

Dew point57°

Sun, 1170° / 57°

70 °

Sycamore, Sunday, 11 October

Clear. High 70°, low 57°.

Pressure30.00 inHg

Wind7.4 mph SE

Humidity65%

Visibility6.2 mi

Dew point56°

Mon, 1280° / 56°

0.02

80 °

Sycamore, Monday, 12 October

Light rain. High 80°, low 56°.

Pressure29.77 inHg

Wind12.3 mph W

Humidity54%

Visibility—

Dew point57°

Tue, 1365° / 47°

65 °

Sycamore, Tuesday, 13 October

Overcast. High 65°, low 47°.

Pressure30.03 inHg

Wind14.7 mph NW

Humidity61%

Visibility—

Dew point43°

Wed, 1457° / 43°

57 °

Sycamore, Wednesday, 14 October

Overcast. High 57°, low 43°.

Pressure30.09 inHg

Wind14.7 mph S

Humidity54%

Visibility—

Dew point38°

Thu, 1583° / 58°

0.06

83 °

Sycamore, Thursday, 15 October

Light rain. High 83°, low 58°.

Pressure29.77 inHg

Wind18.4 mph S

Humidity63%

Visibility—

Dew point64°

Fri, 1680° / 59°

0.2

80 °

Sycamore, Friday, 16 October

Light rain. High 80°, low 59°.

Pressure29.85 inHg

Wind19.2 mph SW

Humidity73%

Visibility—

Dew point66°

Sat, 1753° / 46°

53 °

Sycamore, Saturday, 17 October

Overcast. High 53°, low 46°.

Pressure30.15 inHg

Wind16.5 mph W

Humidity61%

Visibility—

Dew point36°

Sun, 1852° / 46°

52 °

Sycamore, Sunday, 18 October

Overcast. High 52°, low 46°.

Pressure30.27 inHg

Wind8.9 mph W

Humidity54%

Visibility—

Dew point34°

Mon, 1959° / 42°

59 °

Sycamore, Monday, 19 October

Partly cloudy. High 59°, low 42°.

Pressure30.27 inHg

Wind10.2 mph S

Humidity50%

Visibility—

Dew point37°

Tue, 2060° / 45°

60 °

Sycamore, Tuesday, 20 October

Mostly clear. High 60°, low 45°.

Pressure30.15 inHg

Wind12.9 mph N

Humidity47%

Visibility—

Dew point38°

Wed, 2156° / 37°

56 °

Sycamore, Wednesday, 21 October

Clear. High 56°, low 37°.

Pressure30.24 inHg

Wind9.3 mph NE

Humidity52%

Visibility—

Dew point34°

Thu, 2262° / 40°

62 °

Sycamore, Thursday, 22 October

Partly cloudy. High 62°, low 40°.

Pressure29.74 inHg

Wind16.3 mph S

Humidity51%

Visibility—

Dew point39°

From day 17 onward the outlook is built from 60-year climate statistics

Fri, 2359° / 44°

0.11

59 °

Sycamore, Friday, 23 October

Climate normal for this date — 60-year average.

Average high59°

Average low44°

Average precipitation0.11 in

Chance of precipitation38%

Record high78° (1963)

Record low25° (1969)

Sat, 2457° / 44°

0.11

57 °

Sycamore, Saturday, 24 October

Climate normal for this date — 60-year average.

Average high57°

Average low44°

Average precipitation0.11 in

Chance of precipitation38%

Record high78° (1963)

Record low22° (1981)

Sun, 2557° / 42°

0.1

57 °

Sycamore, Sunday, 25 October

Climate normal for this date — 60-year average.

Average high57°

Average low42°

Average precipitation0.1 in

Chance of precipitation27%

Record high75° (1989)

Record low27° (2006)

Mon, 2656° / 42°

0.09

56 °

Sycamore, Monday, 26 October

Climate normal for this date — 60-year average.

Average high56°

Average low42°

Average precipitation0.09 in

Chance of precipitation23%

Record high79° (1963)

Record low22° (1962)

Tue, 2756° / 41°

0.08

56 °

Sycamore, Tuesday, 27 October

Climate normal for this date — 60-year average.

Average high56°

Average low41°

Average precipitation0.08 in

Chance of precipitation22%

Record high75° (2014)

Record low27° (1997)

Wed, 2855° / 41°

0.04

55 °

Sycamore, Wednesday, 28 October

Climate normal for this date — 60-year average.

Average high55°

Average low41°

Average precipitation0.04 in

Chance of precipitation17%

Record high74° (1999)

Record low25° (1976)

Thu, 2955° / 40°

0.06

55 °

Sycamore, Thursday, 29 October

Climate normal for this date — 60-year average.

Average high55°

Average low40°

Average precipitation0.06 in

Chance of precipitation18%

Record high78° (2024)

Record low23° (1980)

Fri, 3057° / 41°

0.1

57 °

Sycamore, Friday, 30 October

Climate normal for this date — 60-year average.

Average high57°

Average low41°

Average precipitation0.1 in

Chance of precipitation27%

Record high77° (1971)

Record low22° (1988)

Sat, 3155° / 42°

0.11

55 °

Sycamore, Saturday, 31 October

Climate normal for this date — 60-year average.

Average high55°

Average low42°

Average precipitation0.11 in

Chance of precipitation42%

Record high73° (1974)

Record low26° (2019)

Sun, 0154° / 40°

0.17

54 °

Sycamore, Sunday, 1 November

Climate normal for this date — 60-year average.

Average high54°

Average low40°

Average precipitation0.17 in

Chance of precipitation38%

Record high73° (2000)

Record low18° (2019)

Mon, 0253° / 39°

0.1

53 °

Sycamore, Monday, 2 November

Climate normal for this date — 60-year average.

Average high53°

Average low39°

Average precipitation0.1 in

Chance of precipitation33%

Record high74° (1961)

Record low21° (1991)

Tue, 0352° / 38°

0.07

52 °

Sycamore, Tuesday, 3 November

Climate normal for this date — 60-year average.

Average high52°

Average low38°

Average precipitation0.07 in

Chance of precipitation28%

Record high72° (1964)

Record low16° (1991)

Wed, 0452° / 40°

0.1

52 °

Sycamore, Wednesday, 4 November

Climate normal for this date — 60-year average.

Average high52°

Average low40°

Average precipitation0.1 in

Chance of precipitation25%

Record high71° (2015)

Record low14° (1991)

Thu, 0552° / 38°

0.11

52 °

Sycamore, Thursday, 5 November

Climate normal for this date — 60-year average.

Average high52°

Average low38°

Average precipitation0.11 in

Chance of precipitation27%

Record high73° (1978)

Record low17° (1991)

About the monthly outlook

How accurate is a 30-day forecast?

The first 16 days come from weather models — reliable for the first 3–5 days and progressively less so after that. Days 17 through 30 for Sycamore, IL are built from the climate normal, the 60-year average, so they show typical weather for those dates rather than a specific forecast.

What does "above normal" mean?

We compare the forecast against the climate normal for those exact calendar days, computed from 60 years of observations. The deviation shows how much the coming month differs from a typical one.

Where do the 66-year records come from?

They are real temperature extremes recorded in Sycamore, IL since 1960: the highest and lowest reading for each calendar date, with the year it happened.

How often is it updated?

The forecast portion refreshes every hour; the climate portion is based on long-term data and stays stable.