As of 00:44 BST

Weather in Harrow on the Hill

+18°

Harrow on the Hill, Sunday, 9 August, 00:44

Overcast. Feels like 17°C. High 31°C, low 14°C.

Pressure1016 mb

Wind3 mph S

Humidity59%

Visibility6.2 mi

Dew point9°C

Detailed hourly forecast

Mon, 10+12 ° /25 °

+25 °

Harrow on the Hill, Monday, 10 August

Overcast. High 25°C, low 12°C.

Pressure1020 mb

Wind9 mph NW

Humidity31%

Visibility6.2 mi

Dew point5°C

Tue, 11+16 ° /25 °

+25 °

Harrow on the Hill, Tuesday, 11 August

Clear sky. High 25°C, low 16°C.

Pressure1025 mb

Wind10 mph E

Humidity34%

Visibility6.2 mi

Dew point7°C

Wed, 12+17 ° /31 °

+31 °

Harrow on the Hill, Wednesday, 12 August

Overcast. High 31°C, low 17°C.

Pressure1023 mb

Wind6 mph SE

Humidity19%

Visibility6.2 mi

Dew point3°C

Thu, 13+21 ° /37 °

+37 °

Harrow on the Hill, Thursday, 13 August

Clear sky. High 37°C, low 21°C.

Pressure1018 mb

Wind9 mph SE

Humidity12%

Visibility—

Dew point0°C

Fri, 14+21 ° /33 °

+33 °

Harrow on the Hill, Friday, 14 August

Overcast. High 33°C, low 21°C.

Pressure1016 mb

Wind12 mph W

Humidity32%

Visibility—

Dew point10°C

Sat, 15+19 ° /30 °

+30 °

Harrow on the Hill, Saturday, 15 August

Overcast. High 30°C, low 19°C.

Pressure1014 mb

Wind15 mph N

Humidity36%

Visibility—

Dew point11°C

Sun, 16+16 ° /23 °

0.3

+23 °

Harrow on the Hill, Sunday, 16 August

Light rain. High 23°C, low 16°C.

Pressure1017 mb

Wind10 mph NE

Humidity50%

Visibility—

Dew point11°C

Mon, 17+17 ° /20 °

0.4

+20 °

Harrow on the Hill, Monday, 17 August

Light rain. High 20°C, low 17°C.

Pressure1014 mb

Wind12 mph SW

Humidity51%

Visibility—

Dew point9°C

Tue, 18+15 ° /26 °

0.2

+26 °

Harrow on the Hill, Tuesday, 18 August

Light rain. High 26°C, low 15°C.

Pressure1012 mb

Wind14 mph W

Humidity37%

Visibility—

Dew point7°C

Wed, 19+14 ° /24 °

+24 °

Harrow on the Hill, Wednesday, 19 August

Partly cloudy. High 24°C, low 14°C.

Pressure1014 mb

Wind10 mph W

Humidity31%

Visibility—

Dew point3°C

Thu, 20+14 ° /25 °

+25 °

Harrow on the Hill, Thursday, 20 August

Overcast. High 25°C, low 14°C.

Pressure1012 mb

Wind9 mph NE

Humidity33%

Visibility—

Dew point5°C

Fri, 21+14 ° /23 °

0.3

+23 °

Harrow on the Hill, Friday, 21 August

Light rain. High 23°C, low 14°C.

Pressure1013 mb

Wind11 mph N

Humidity36%

Visibility—

Dew point6°C

Sat, 22+15 ° /22 °

1.5

+22 °

Harrow on the Hill, Saturday, 22 August

Light rain. High 22°C, low 15°C.

Pressure1019 mb

Wind10 mph NE

Humidity36%

Visibility—

Dew point6°C

Sun, 23+13 ° /24 °

+24 °

Harrow on the Hill, Sunday, 23 August

Clear sky. High 24°C, low 13°C.

Pressure1020 mb

Wind8 mph NE

Humidity35%

Visibility—

Dew point5°C

Mon, 24+17 ° /25 °

+25 °

Harrow on the Hill, Monday, 24 August

Partly cloudy. High 25°C, low 17°C.

Pressure1018 mb

Wind9 mph SW

Humidity30%

Visibility—

Dew point5°C

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.