As of 03:37 CDT

Weather in Deerfield, IL

64°

Deerfield, Monday, 12 October, 03:37

Overcast. Feels like 64°. High 84°, low 62°.

Pressure29.88 inHg

Wind9.6 mph SW

Humidity74%

Visibility6.2 mi

Dew point56°

See detailed hourly forecast

Monthly outlook for Deerfield, IL: average high 65.2°, average low 53.2°. That is 4.3° above the climate normal for October. Precipitation is expected on 5 days (about 2.4 inches), against a normal of 5 days and 1.8 inches. The warmest day looks like 12 October (83.8°), the coolest 17 October (40.7°).

65.2°/53.2°

Average high / low

+4.3°

Above normal

5 / 5

Wet days / normal

2.4 in

Precipitation this month

Ten-day blocks vs climate normal

Period	Forecast high	Normal	Difference
12 October – 21 October	66.7°	58.5°	+4.6°
22 October – 31 October	62.6°	54.8°	+4.4°
1 November – 10 November	at normal	50.6°	—

October records over 66 years

87.4°3 October 2025All-time high

27.5°31 October 2019All-time low

Climate normals and records are computed from the nearest reference point — Highwood (3 mi).

Tue, 1381° / 64°

0.04

81 °

Deerfield, Tuesday, 13 October

Rain. High 81°, low 64°.

Pressure29.80 inHg

Wind11.1 mph W

Humidity64%

Visibility6.2 mi

Dew point63°

Wed, 1467° / 58°

0.3

67 °

Deerfield, Wednesday, 14 October

Heavy rain. High 67°, low 58°.

Pressure30.09 inHg

Wind7 mph NE

Humidity68%

Visibility6.2 mi

Dew point57°

Thu, 1558° / 55°

1.22

58 °

Deerfield, Thursday, 15 October

Rain. High 58°, low 55°.

Pressure30.15 inHg

Wind8 mph E

Humidity96%

Visibility1.5 mi

Dew point55°

Fri, 1656° / 46°

56 °

Deerfield, Friday, 16 October

Partly cloudy. High 56°, low 46°.

Pressure30.36 inHg

Wind16.4 mph NW

Humidity50%

Visibility—

Dew point36°

Sat, 1758° / 41°

58 °

Deerfield, Saturday, 17 October

Clear. High 58°, low 41°.

Pressure30.42 inHg

Wind10.8 mph SW

Humidity42%

Visibility—

Dew point32°

Sun, 1860° / 44°

60 °

Deerfield, Sunday, 18 October

Clear. High 60°, low 44°.

Pressure30.27 inHg

Wind14 mph SW

Humidity29%

Visibility—

Dew point24°

Mon, 1966° / 50°

66 °

Deerfield, Monday, 19 October

Overcast. High 66°, low 50°.

Pressure30.21 inHg

Wind10.4 mph SW

Humidity40%

Visibility—

Dew point38°

Tue, 2068° / 59°

68 °

Deerfield, Tuesday, 20 October

Overcast. High 68°, low 59°.

Pressure30.27 inHg

Wind4.5 mph E

Humidity57%

Visibility—

Dew point51°

Wed, 2168° / 58°

68 °

Deerfield, Wednesday, 21 October

Clear. High 68°, low 58°.

Pressure30.33 inHg

Wind7 mph SE

Humidity59%

Visibility—

Dew point52°

Thu, 2273° / 59°

73 °

Deerfield, Thursday, 22 October

Partly cloudy. High 73°, low 59°.

Pressure30.24 inHg

Wind10.4 mph SW

Humidity46%

Visibility—

Dew point48°

Fri, 2367° / 55°

0.2

67 °

Deerfield, Friday, 23 October

Rain. High 67°, low 55°.

Pressure30.21 inHg

Wind13.1 mph SW

Humidity34%

Visibility—

Dew point38°

Sat, 2457° / 51°

57 °

Deerfield, Saturday, 24 October

Clear. High 57°, low 51°.

Pressure30.39 inHg

Wind9.8 mph SE

Humidity49%

Visibility—

Dew point36°

Sun, 2560° / 52°

0.63

60 °

Deerfield, Sunday, 25 October

Rain. High 60°, low 52°.

Pressure29.80 inHg

Wind12.9 mph S

Humidity82%

Visibility—

Dew point51°

Mon, 2657° / 52°

0.02

57 °

Deerfield, Monday, 26 October

Light rain. High 57°, low 52°.

Pressure30.06 inHg

Wind14.7 mph N

Humidity58%

Visibility—

Dew point42°

Tue, 2761° / 47°

61 °

Deerfield, Tuesday, 27 October

Clear. High 61°, low 47°.

Pressure30.12 inHg

Wind4.3 mph NW

Humidity39%

Visibility—

Dew point34°

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

Wed, 2853° / 45°

0.05

53 °

Deerfield, Wednesday, 28 October

Climate normal for this date — 60-year average.

Average high53°

Average low45°

Average precipitation0.05 in

Chance of precipitation18%

Record high67° (1999)

Record low31° (2020)

Thu, 2953° / 45°

0.06

53 °

Deerfield, Thursday, 29 October

Climate normal for this date — 60-year average.

Average high53°

Average low45°

Average precipitation0.06 in

Chance of precipitation22%

Record high78° (2024)

Record low31° (1988)

Fri, 3055° / 46°

0.1

55 °

Deerfield, Friday, 30 October

Climate normal for this date — 60-year average.

Average high55°

Average low46°

Average precipitation0.1 in

Chance of precipitation30%

Record high76° (2024)

Record low30° (2020)

Sat, 3154° / 45°

0.13

54 °

Deerfield, Saturday, 31 October

Climate normal for this date — 60-year average.

Average high54°

Average low45°

Average precipitation0.13 in

Chance of precipitation42%

Record high71° (2024)

Record low28° (2019)

Sun, 0153° / 44°

0.17

53 °

Deerfield, Sunday, 1 November

Climate normal for this date — 60-year average.

Average high53°

Average low44°

Average precipitation0.17 in

Chance of precipitation42%

Record high67° (2016)

Record low20° (2019)

Mon, 0252° / 43°

0.13

52 °

Deerfield, Monday, 2 November

Climate normal for this date — 60-year average.

Average high52°

Average low43°

Average precipitation0.13 in

Chance of precipitation38%

Record high68° (1961)

Record low25° (1991)

Tue, 0351° / 42°

0.06

51 °

Deerfield, Tuesday, 3 November

Climate normal for this date — 60-year average.

Average high51°

Average low42°

Average precipitation0.06 in

Chance of precipitation23%

Record high70° (2022)

Record low20° (1991)

Wed, 0451° / 43°

0.09

51 °

Deerfield, Wednesday, 4 November

Climate normal for this date — 60-year average.

Average high51°

Average low43°

Average precipitation0.09 in

Chance of precipitation28%

Record high69° (2022)

Record low18° (1991)

Thu, 0551° / 42°

0.12

51 °

Deerfield, Thursday, 5 November

Climate normal for this date — 60-year average.

Average high51°

Average low42°

Average precipitation0.12 in

Chance of precipitation28%

Record high68° (2022)

Record low22° (1991)

Fri, 0651° / 40°

0.09

51 °

Deerfield, Friday, 6 November

Climate normal for this date — 60-year average.

Average high51°

Average low40°

Average precipitation0.09 in

Chance of precipitation28%

Record high70° (2020)

Record low25° (1991)

Sat, 0750° / 41°

0.05

50 °

Deerfield, Saturday, 7 November

Climate normal for this date — 60-year average.

Average high50°

Average low41°

Average precipitation0.05 in

Chance of precipitation18%

Record high68° (2020)

Record low21° (1991)

Sun, 0849° / 41°

0.06

49 °

Deerfield, Sunday, 8 November

Climate normal for this date — 60-year average.

Average high49°

Average low41°

Average precipitation0.06 in

Chance of precipitation17%

Record high72° (2020)

Record low18° (2019)

Mon, 0950° / 40°

0.12

50 °

Deerfield, Monday, 9 November

Climate normal for this date — 60-year average.

Average high50°

Average low40°

Average precipitation0.12 in

Chance of precipitation38%

Record high72° (2020)

Record low23° (2018)

Tue, 1049° / 40°

0.11

49 °

Deerfield, Tuesday, 10 November

Climate normal for this date — 60-year average.

Average high49°

Average low40°

Average precipitation0.11 in

Chance of precipitation37%

Record high72° (2022)

Record low18° (2017)

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 Deerfield, 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 Deerfield, 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.