As of 12:00 BST

Weather in Harrow on the Hill

+12°

Harrow on the Hill, Thursday, 8 October, 12:00

Clear sky. Feels like 11°C. High 12°C, low 6°C.

Pressure1022 mb

Wind11 mph NW

Humidity61%

Visibility6.2 mi

Dew point4°C

Detailed hourly forecast

The month ahead in Harrow on the Hill: daytime temperatures averaging +14.9° and +9.3° overnight — that is 0.8° above the climate average for October. Rain is expected on 4 days (around 38 mm), against a normal of 5 days and 32 mm. The warmest day should be 13 October (+20.8°), the coolest 17 October (+6.1°).

+14.9°/+9.3°

Average day / night

+0.8°

Above average

4 / 5

Wet days / normal

38 mm

Rainfall this month

Ten-day blocks against the climate average

Period	Forecast (day)	Average	Difference
8 October – 17 October	+15.1°	+14.5°	+0.7°
18 October – 27 October	+14.4°	+13.2°	+1.2°
28 October – 6 November	near average	+11.8°	—

October records over 66 years

+25.4°1 October 2011All-time high

-2.2°16 October 1993All-time low

Fri, 09+8 ° /17 °

3.9

+17 °

Harrow on the Hill, Friday, 9 October

Light rain. High 17°C, low 8°C.

Pressure1012 mb

Wind17 mph W

Humidity67%

Visibility6.2 mi

Dew point12°C

Sat, 10+8 ° /14 °

+14 °

Harrow on the Hill, Saturday, 10 October

Overcast. High 14°C, low 8°C.

Pressure1014 mb

Wind13 mph W

Humidity58%

Visibility6.2 mi

Dew point5°C

Sun, 11+6 ° /14 °

+14 °

Harrow on the Hill, Sunday, 11 October

Overcast. High 14°C, low 6°C.

Pressure1014 mb

Wind6 mph W

Humidity65%

Visibility6.2 mi

Dew point7°C

Mon, 12+8 ° /16 °

0.3

+16 °

Harrow on the Hill, Monday, 12 October

Light rain. High 16°C, low 8°C.

Pressure1017 mb

Wind9 mph SE

Humidity82%

Visibility6.2 mi

Dew point12°C

Tue, 13+16 ° /21 °

0.5

+21 °

Harrow on the Hill, Tuesday, 13 October

Light rain. High 21°C, low 16°C.

Pressure1022 mb

Wind10 mph SW

Humidity70%

Visibility—

Dew point15°C

Wed, 14+12 ° /19 °

+19 °

Harrow on the Hill, Wednesday, 14 October

Overcast. High 19°C, low 12°C.

Pressure1022 mb

Wind8 mph SW

Humidity62%

Visibility—

Dew point10°C

Thu, 15+9 ° /13 °

3.5

+13 °

Harrow on the Hill, Thursday, 15 October

Light rain. High 13°C, low 9°C.

Pressure1018 mb

Wind16 mph NW

Humidity84%

Visibility—

Dew point7°C

Fri, 16+7 ° /13 °

+13 °

Harrow on the Hill, Friday, 16 October

Clear sky. High 13°C, low 7°C.

Pressure1022 mb

Wind9 mph NW

Humidity50%

Visibility—

Dew point1°C

Sat, 17+6 ° /14 °

0.2

+14 °

Harrow on the Hill, Saturday, 17 October

Light rain. High 14°C, low 6°C.

Pressure1015 mb

Wind12 mph N

Humidity57%

Visibility—

Dew point4°C

Sun, 18+11 ° /15 °

14.4

+15 °

Harrow on the Hill, Sunday, 18 October

Rain. High 15°C, low 11°C.

Pressure1013 mb

Wind13 mph N

Humidity73%

Visibility—

Dew point10°C

Mon, 19+10 ° /13 °

14.7

+13 °

Harrow on the Hill, Monday, 19 October

Rain. High 13°C, low 10°C.

Pressure1023 mb

Wind10 mph E

Humidity62%

Visibility—

Dew point6°C

Tue, 20+9 ° /15 °

+15 °

Harrow on the Hill, Tuesday, 20 October

Overcast. High 15°C, low 9°C.

Pressure1021 mb

Wind13 mph E

Humidity65%

Visibility—

Dew point8°C

Wed, 21+12 ° /15 °

+15 °

Harrow on the Hill, Wednesday, 21 October

Overcast. High 15°C, low 12°C.

Pressure1015 mb

Wind7 mph NE

Humidity75%

Visibility—

Dew point10°C

Thu, 22+12 ° /13 °

+13 °

Harrow on the Hill, Thursday, 22 October

Overcast. High 13°C, low 12°C.

Pressure1022 mb

Wind9 mph N

Humidity69%

Visibility—

Dew point7°C

Fri, 23+10 ° /14 °

+14 °

Harrow on the Hill, Friday, 23 October

Overcast. High 14°C, low 10°C.

Pressure1028 mb

Wind12 mph N

Humidity53%

Visibility—

Dew point5°C

Days 17 onward are based on 60-year climate statistics

Sat, 24+7 ° /13 °

+13 °

Harrow on the Hill, Saturday, 24 October

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

Average high13°C

Average low7°C

Average rainfall2 mm

Chance of rain38%

Warmest on record+18° (2017)

Coldest on record+0° (1964)

Sun, 25+8 ° /13 °

1.5

+13 °

Harrow on the Hill, Sunday, 25 October

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

Average high13°C

Average low8°C

Average rainfall1.5 mm

Chance of rain33%

Warmest on record+17° (2017)

Coldest on record+0° (1997)

Mon, 26+7 ° /13 °

1.2

+13 °

Harrow on the Hill, Monday, 26 October

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

Average high13°C

Average low7°C

Average rainfall1.2 mm

Chance of rain27%

Warmest on record+18° (2022)

Coldest on record+0° (1997)

Tue, 27+8 ° /13 °

1.6

+13 °

Harrow on the Hill, Tuesday, 27 October

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

Average high13°C

Average low8°C

Average rainfall1.6 mm

Chance of rain33%

Warmest on record+20° (2022)

Coldest on record-1° (1962)

Wed, 28+7 ° /13 °

2.1

+13 °

Harrow on the Hill, Wednesday, 28 October

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

Average high13°C

Average low7°C

Average rainfall2.1 mm

Chance of rain40%

Warmest on record+18° (2022)

Coldest on record0° (2003)

Thu, 29+7 ° /12 °

1.3

+12 °

Harrow on the Hill, Thursday, 29 October

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

Average high12°C

Average low7°C

Average rainfall1.3 mm

Chance of rain28%

Warmest on record+21° (2022)

Coldest on record-2° (1997)

Fri, 30+7 ° /13 °

1.3

+13 °

Harrow on the Hill, Friday, 30 October

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

Average high13°C

Average low7°C

Average rainfall1.3 mm

Chance of rain23%

Warmest on record+19° (2001)

Coldest on record-1° (1983)

Sat, 31+7 ° /13 °

2.3

+13 °

Harrow on the Hill, Saturday, 31 October

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

Average high13°C

Average low7°C

Average rainfall2.3 mm

Chance of rain33%

Warmest on record+19° (2014)

Coldest on record-2° (1997)

Sun, 01+7 ° /12 °

2.3

+12 °

Harrow on the Hill, Sunday, 1 November

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

Average high12°C

Average low7°C

Average rainfall2.3 mm

Chance of rain38%

Warmest on record+17° (1999)

Coldest on record-1° (1988)

Mon, 02+7 ° /12 °

2.8

+12 °

Harrow on the Hill, Monday, 2 November

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

Average high12°C

Average low7°C

Average rainfall2.8 mm

Chance of rain35%

Warmest on record+17° (2005)

Coldest on record-1° (1997)

Tue, 03+6 ° /12 °

1.7

+12 °

Harrow on the Hill, Tuesday, 3 November

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

Average high12°C

Average low6°C

Average rainfall1.7 mm

Chance of rain28%

Warmest on record+16° (2025)

Coldest on record-3° (1985)

Wed, 04+6 ° /11 °

2.4

+11 °

Harrow on the Hill, Wednesday, 4 November

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

Average high11°C

Average low6°C

Average rainfall2.4 mm

Chance of rain37%

Warmest on record+15° (2010)

Coldest on record-1° (1966)

Thu, 05+6 ° /11 °

1.3

+11 °

Harrow on the Hill, Thursday, 5 November

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

Average high11°C

Average low6°C

Average rainfall1.3 mm

Chance of rain28%

Warmest on record+17° (2025)

Coldest on record-2° (1988)

Fri, 06+6 ° /11 °

2.3

+11 °

Harrow on the Hill, Friday, 6 November

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

Average high11°C

Average low6°C

Average rainfall2.3 mm

Chance of rain37%

Warmest on record+17° (2025)

Coldest on record0° (2014)

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 Harrow on the Hill 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 Harrow on the Hill 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.