South Harrow weather

The South Harrow weather guide shows monthly weather averages (including daytime and night-time temperatures, rainfall and hours of sunshine) for holidays in South Harrow, Greater London, England in 2026/2027.

• South Harrow weather averages
• South Harrow weather by month
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South Harrow weather averages

Check the South Harrow weather averages for each month of the year including maximum daytime and minimum night-time temperatures, monthly rainfall, number of days with rain and average daily hours of sunshine for South Harrow, Greater London, England.

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South Harrow weather by month

Check the weather for South Harrow, Greater London, England for a particular month by selecting from the list below. This gives the best indication of what to expect from the weather months in advance.

• January
• February
• March
• April
• May
• June
• July
• August
• September
• October
• November
• December

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South Harrow weather in January

The average maximum daytime temperature in South Harrow in January is a cold 7°C (45°F), while the average minimum night-time temperature is a cold 1°C (34°F). You can expect on average 2 hours of sunshine a day in South Harrow during January.

• 7
  7°C max day temperature
• 2
  2 hours of sunshine per day
• 17
  17 days with some rainfall
• 1
  1°C min night temperature
• 65
  65 mm of monthly rainfall

On average 65 mm (2.6 inches) of rain normally falls in South Harrow during January with rain falling on 17 days of the month.

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South Harrow weather in February

The average maximum daytime temperature in South Harrow in February is a cold 7°C (45°F), while the average minimum night-time temperature is a cold 1°C (34°F). You can expect on average 2 hours of sunshine a day in South Harrow during February.

• 7
  7°C max day temperature
• 2
  2 hours of sunshine per day
• 13
  13 days with some rainfall
• 1
  1°C min night temperature
• 43
  43 mm of monthly rainfall

On average 43 mm (1.7 inches) of rain normally falls in South Harrow during February with rain falling on 13 days of the month.

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South Harrow weather in March

The average maximum daytime temperature in South Harrow in March is a cool 10°C (50°F), while the average minimum night-time temperature is a cold 3°C (37°F). You can expect on average 4 hours of sunshine a day in South Harrow during March.

• 10
  10°C max day temperature
• 4
  4 hours of sunshine per day
• 15
  15 days with some rainfall
• 3
  3°C min night temperature
• 52
  52 mm of monthly rainfall

On average 52 mm (2 inches) of rain normally falls in South Harrow during March with rain falling on 15 days of the month.

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South Harrow weather in April

The average maximum daytime temperature in South Harrow in April is a cool 12°C (54°F), while the average minimum night-time temperature is a cold 4°C (39°F). You can expect on average 5 hours of sunshine a day in South Harrow during April.

• 12
  12°C max day temperature
• 5
  5 hours of sunshine per day
• 13
  13 days with some rainfall
• 4
  4°C min night temperature
• 51
  51 mm of monthly rainfall

On average 51 mm (2 inches) of rain normally falls in South Harrow during April with rain falling on 13 days of the month.

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South Harrow weather in May

The average maximum daytime temperature in South Harrow in May is a comfortable 16°C (61°F), while the average minimum night-time temperature is a cold 7°C (45°F). You can expect on average 6 hours of sunshine a day in South Harrow during May.

• 16
  16°C max day temperature
• 6
  6 hours of sunshine per day
• 13
  13 days with some rainfall
• 7
  7°C min night temperature
• 50
  50 mm of monthly rainfall

On average 50 mm (2 inches) of rain normally falls in South Harrow during May with rain falling on 13 days of the month.

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South Harrow weather in June

The average maximum daytime temperature in South Harrow in June is a comfortable 19°C (66°F), while the average minimum night-time temperature is a cool 10°C (50°F). You can expect on average 7 hours of sunshine a day in South Harrow during June.

• 19
  19°C max day temperature
• 7
  7 hours of sunshine per day
• 12
  12 days with some rainfall
• 10
  10°C min night temperature
• 60
  60 mm of monthly rainfall

On average 60 mm (2.4 inches) of rain normally falls in South Harrow during June with rain falling on 12 days of the month.

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South Harrow weather in July

The average maximum daytime temperature in South Harrow in July is a warm 22°C (72°F), while the average minimum night-time temperature is a cool 12°C (54°F). You can expect on average 6 hours of sunshine a day in South Harrow during July.

• 22
  22°C max day temperature
• 6
  6 hours of sunshine per day
• 11
  11 days with some rainfall
• 12
  12°C min night temperature
• 44
  44 mm of monthly rainfall

On average 44 mm (1.7 inches) of rain normally falls in South Harrow during July with rain falling on 11 days of the month.

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South Harrow weather in August

The average maximum daytime temperature in South Harrow in August is a warm 22°C (72°F), while the average minimum night-time temperature is a cool 12°C (54°F). You can expect on average 6 hours of sunshine a day in South Harrow during August.

• 22
  22°C max day temperature
• 6
  6 hours of sunshine per day
• 11
  11 days with some rainfall
• 12
  12°C min night temperature
• 52
  52 mm of monthly rainfall

On average 52 mm (2 inches) of rain normally falls in South Harrow during August with rain falling on 11 days of the month.

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South Harrow weather in September

The average maximum daytime temperature in South Harrow in September is a comfortable 18°C (64°F), while the average minimum night-time temperature is a cool 10°C (50°F). You can expect on average 5 hours of sunshine a day in South Harrow during September.

• 18
  18°C max day temperature
• 5
  5 hours of sunshine per day
• 12
  12 days with some rainfall
• 10
  10°C min night temperature
• 62
  62 mm of monthly rainfall

On average 62 mm (2.4 inches) of rain normally falls in South Harrow during September with rain falling on 12 days of the month.

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South Harrow weather in October

The average maximum daytime temperature in South Harrow in October is a comfortable 14°C (57°F), while the average minimum night-time temperature is a cold 7°C (45°F). You can expect on average 3 hours of sunshine a day in South Harrow during October.

• 14
  14°C max day temperature
• 3
  3 hours of sunshine per day
• 14
  14 days with some rainfall
• 7
  7°C min night temperature
• 70
  70 mm of monthly rainfall

On average 70 mm (2.8 inches) of rain normally falls in South Harrow during October with rain falling on 14 days of the month.

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South Harrow weather in November

The average maximum daytime temperature in South Harrow in November is a cool 10°C (50°F), while the average minimum night-time temperature is a cold 4°C (39°F). You can expect on average 2 hours of sunshine a day in South Harrow during November.

• 10
  10°C max day temperature
• 2
  2 hours of sunshine per day
• 15
  15 days with some rainfall
• 4
  4°C min night temperature
• 63
  63 mm of monthly rainfall

On average 63 mm (2.5 inches) of rain normally falls in South Harrow during November with rain falling on 15 days of the month.

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South Harrow weather in December

The average maximum daytime temperature in South Harrow in December is a cold 7°C (45°F), while the average minimum night-time temperature is a cold 2°C (36°F). You can expect on average 2 hours of sunshine a day in South Harrow during December.

• 7
  7°C max day temperature
• 2
  2 hours of sunshine per day
• 15
  15 days with some rainfall
• 2
  2°C min night temperature
• 67
  67 mm of monthly rainfall

On average 67 mm (2.6 inches) of rain normally falls in South Harrow during December with rain falling on 15 days of the month.

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