As of 12:19 BST

Weather in O'hare

+11°

O'hare, Wednesday, 7 October, 12:19

Mainly clear. Feels like 10°C. High 13°C, low 6°C.

Pressure1015 mb

Wind8 mph W

Humidity72%

Visibility6.2 mi

Dew point7°C

Detailed hourly forecast

The month ahead in O'hare: daytime temperatures averaging +12.1° and +6.2° overnight — that is 0.3° above the climate average for October. Rain is expected on 7 days (around 69 mm), against a normal of 8 days and 67 mm. The warmest day should be 13 October (+15.1°), the coolest 22 October (+2°).

+12.1°/+6.2°

Average day / night

+0.3°

Above average

7 / 8

Wet days / normal

69 mm

Rainfall this month

Ten-day blocks against the climate average

Period	Forecast (day)	Average	Difference
7 October – 16 October	+13.5°	+12.2°	+1.3°
17 October – 26 October	+9.8°	+10.9°	-1.1°
27 October – 5 November	near average	+9.9°	—

October records over 66 years

+19.2°1 October 1985All-time high

-3.2°20 October 2002All-time low

Climate averages and records are calculated from the nearest reference point — Alexandria (1.3 km away).

Thu, 08+6 ° /14 °

9.7

+14 °

O'hare, Thursday, 8 October

Rain. High 14°C, low 6°C.

Pressure1021 mb

Wind7 mph W

Humidity69%

Visibility6.2 mi

Dew point6°C

Fri, 09+9 ° /14 °

15.3

+14 °

O'hare, Friday, 9 October

Rain. High 14°C, low 9°C.

Pressure1004 mb

Wind15 mph W

Humidity80%

Visibility6.2 mi

Dew point8°C

Sat, 10+8 ° /11 °

10.7

+11 °

O'hare, Saturday, 10 October

Rain. High 11°C, low 8°C.

Pressure1001 mb

Wind15 mph W

Humidity81%

Visibility3.6 mi

Dew point7°C

Sun, 11+8 ° /13 °

+13 °

O'hare, Sunday, 11 October

Overcast. High 13°C, low 8°C.

Pressure1012 mb

Wind6 mph W

Humidity70%

Visibility6.2 mi

Dew point6°C

Mon, 12+7 ° /15 °

+15 °

O'hare, Monday, 12 October

Light rain. High 15°C, low 7°C.

Pressure1008 mb

Wind12 mph S

Humidity94%

Visibility—

Dew point11°C

Tue, 13+8 ° /15 °

3.8

+15 °

O'hare, Tuesday, 13 October

Light rain. High 15°C, low 8°C.

Pressure1017 mb

Wind16 mph S

Humidity91%

Visibility—

Dew point12°C

Wed, 14+7 ° /13 °

+13 °

O'hare, Wednesday, 14 October

Overcast. High 13°C, low 7°C.

Pressure1029 mb

Wind7 mph SW

Humidity79%

Visibility—

Dew point8°C

Thu, 15+5 ° /12 °

0.2

+12 °

O'hare, Thursday, 15 October

Light rain. High 12°C, low 5°C.

Pressure1022 mb

Wind6 mph S

Humidity92%

Visibility—

Dew point9°C

Fri, 16+9 ° /15 °

+15 °

O'hare, Friday, 16 October

Overcast. High 15°C, low 9°C.

Pressure1012 mb

Wind10 mph SE

Humidity76%

Visibility—

Dew point10°C

Sat, 17+8 ° /11 °

+11 °

O'hare, Saturday, 17 October

Rain. High 11°C, low 8°C.

Pressure1000 mb

Wind9 mph SW

Humidity95%

Visibility—

Dew point9°C

Sun, 18+5 ° /11 °

6.2

+11 °

O'hare, Sunday, 18 October

Light rain. High 11°C, low 5°C.

Pressure1003 mb

Wind14 mph E

Humidity89%

Visibility—

Dew point7°C

Mon, 19+4 ° /10 °

0.4

+10 °

O'hare, Monday, 19 October

Light rain. High 10°C, low 4°C.

Pressure1000 mb

Wind4 mph W

Humidity77%

Visibility—

Dew point6°C

Tue, 20+4 ° /10 °

0.1

+10 °

O'hare, Tuesday, 20 October

Light rain. High 10°C, low 4°C.

Pressure1001 mb

Wind4 mph NW

Humidity70%

Visibility—

Dew point3°C

Wed, 21+2 ° /10 °

+10 °

O'hare, Wednesday, 21 October

Clear sky. High 10°C, low 2°C.

Pressure1009 mb

Wind6 mph NW

Humidity60%

Visibility—

Dew point1°C

Thu, 22+2 ° /8 °

+8 °

O'hare, Thursday, 22 October

Overcast. High 8°C, low 2°C.

Pressure1013 mb

Wind4 mph NW

Humidity81%

Visibility—

Dew point3°C

Days 17 onward are based on 60-year climate statistics

Fri, 23+6 ° /11 °

4.5

+11 °

O'hare, Friday, 23 October

Climate average for this date — the mean of the last 60 years.

Average high11°C

Average low6°C

Average rainfall4.5 mm

Chance of rain62%

Warmest on record+15° (1996)

Coldest on record0° (1974)

Sat, 24+6 ° /11 °

6.3

+11 °

O'hare, Saturday, 24 October

Climate average for this date — the mean of the last 60 years.

Average high11°C

Average low6°C

Average rainfall6.3 mm

Chance of rain63%

Warmest on record+15° (1995)

Coldest on record-2° (1964)

Sun, 25+6 ° /11 °

4.4

+11 °

O'hare, Sunday, 25 October

Climate average for this date — the mean of the last 60 years.

Average high11°C

Average low6°C

Average rainfall4.4 mm

Chance of rain53%

Warmest on record+15° (1996)

Coldest on record+0° (1992)

Mon, 26+6 ° /11 °

4.9

+11 °

O'hare, Monday, 26 October

Climate average for this date — the mean of the last 60 years.

Average high11°C

Average low6°C

Average rainfall4.9 mm

Chance of rain58%

Warmest on record+15° (2005)

Coldest on record-2° (2012)

Tue, 27+6 ° /11 °

5.5

+11 °

O'hare, Tuesday, 27 October

Climate average for this date — the mean of the last 60 years.

Average high11°C

Average low6°C

Average rainfall5.5 mm

Chance of rain63%

Warmest on record+18° (2005)

Coldest on record-3° (2012)

Wed, 28+6 ° /11 °

5.3

+11 °

O'hare, Wednesday, 28 October

Climate average for this date — the mean of the last 60 years.

Average high11°C

Average low6°C

Average rainfall5.3 mm

Chance of rain57%

Warmest on record+16° (2005)

Coldest on record-1° (2008)

Thu, 29+5 ° /10 °

5.2

+10 °

O'hare, Thursday, 29 October

Climate average for this date — the mean of the last 60 years.

Average high10°C

Average low5°C

Average rainfall5.2 mm

Chance of rain50%

Warmest on record+14° (2005)

Coldest on record-2° (2018)

Fri, 30+5 ° /10 °

5.1

+10 °

O'hare, Friday, 30 October

Climate average for this date — the mean of the last 60 years.

Average high10°C

Average low5°C

Average rainfall5.1 mm

Chance of rain58%

Warmest on record+15° (2005)

Coldest on record-2° (2018)

Sat, 31+6 ° /11 °

5.5

+11 °

O'hare, Saturday, 31 October

Climate average for this date — the mean of the last 60 years.

Average high11°C

Average low6°C

Average rainfall5.5 mm

Chance of rain63%

Warmest on record+16° (2014)

Coldest on record-2° (1988)

Sun, 01+5 ° /10 °

5.2

+10 °

O'hare, Sunday, 1 November

Climate average for this date — the mean of the last 60 years.

Average high10°C

Average low5°C

Average rainfall5.2 mm

Chance of rain62%

Warmest on record+14° (2007)

Coldest on record-2° (2008)

Mon, 02+5 ° /10 °

5.2

+10 °

O'hare, Monday, 2 November

Climate average for this date — the mean of the last 60 years.

Average high10°C

Average low5°C

Average rainfall5.2 mm

Chance of rain53%

Warmest on record+15° (1971)

Coldest on record-2° (1998)

Tue, 03+5 ° /9 °

5.4

+9 °

O'hare, Tuesday, 3 November

Climate average for this date — the mean of the last 60 years.

Average high9°C

Average low5°C

Average rainfall5.4 mm

Chance of rain63%

Warmest on record+15° (1979)

Coldest on record-6° (1968)

Wed, 04+4 ° /9 °

3.3

+9 °

O'hare, Wednesday, 4 November

Climate average for this date — the mean of the last 60 years.

Average high9°C

Average low4°C

Average rainfall3.3 mm

Chance of rain55%

Warmest on record+13° (1978)

Coldest on record-7° (1968)

Thu, 05+4 ° /9 °

3.4

+9 °

O'hare, Thursday, 5 November

Climate average for this date — the mean of the last 60 years.

Average high9°C

Average low4°C

Average rainfall3.4 mm

Chance of rain48%

Warmest on record+14° (2025)

Coldest on record-4° (1968)

Questions about the month ahead

How accurate is a month-long forecast?

The first 16 days come from weather models — highly reliable for the first 3–5 days, gradually less so after that. Days 17 to 30 for O'hare are built from climate averages over the last 60 years, so they show typical weather for those dates rather than a specific forecast.

What does "above average" mean?

We compare the forecast with the climate average for exactly the same calendar days, calculated from 60 years of observations. The difference shows how the coming month compares with a typical one.

Where do the 66-year records come from?

These are real historical extremes recorded in O'hare since 1960: the highest and lowest temperature for each calendar date, with the year it happened.

How often is the 30-day forecast updated?

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