Sellafield weather

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

• Sellafield weather averages
• Sellafield weather by month
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Sellafield weather averages

Check the Sellafield 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 Sellafield, Cumbria, England.

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Sellafield weather by month

Check the weather for Sellafield, Cumbria, 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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Sellafield weather in January

The average maximum daytime temperature in Sellafield in January is a cold 6°C (43°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 Sellafield during January.

• 6
  6°C max day temperature
• 2
  2 hours of sunshine per day
• 21
  21 days with some rainfall
• 1
  1°C min night temperature
• 230
  230 mm of monthly rainfall

On average 230 mm (9.1 inches) of rain normally falls in Sellafield during January with rain falling on 21 days of the month.

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Sellafield weather in February

The average maximum daytime temperature in Sellafield 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 3 hours of sunshine a day in Sellafield during February.

• 7
  7°C max day temperature
• 3
  3 hours of sunshine per day
• 17
  17 days with some rainfall
• 1
  1°C min night temperature
• 166
  166 mm of monthly rainfall

On average 166 mm (6.5 inches) of rain normally falls in Sellafield during February with rain falling on 17 days of the month.

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Sellafield weather in March

The average maximum daytime temperature in Sellafield in March is a cool 9°C (48°F), while the average minimum night-time temperature is a cold 2°C (36°F). You can expect on average 3 hours of sunshine a day in Sellafield during March.

• 9
  9°C max day temperature
• 3
  3 hours of sunshine per day
• 19
  19 days with some rainfall
• 2
  2°C min night temperature
• 186
  186 mm of monthly rainfall

On average 186 mm (7.3 inches) of rain normally falls in Sellafield during March with rain falling on 19 days of the month.

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Sellafield weather in April

The average maximum daytime temperature in Sellafield in April is a cool 11°C (52°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 Sellafield during April.

• 11
  11°C max day temperature
• 5
  5 hours of sunshine per day
• 16
  16 days with some rainfall
• 4
  4°C min night temperature
• 110
  110 mm of monthly rainfall

On average 110 mm (4.3 inches) of rain normally falls in Sellafield during April with rain falling on 16 days of the month.

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Sellafield weather in May

The average maximum daytime temperature in Sellafield in May is a comfortable 15°C (59°F), while the average minimum night-time temperature is a cold 6°C (43°F). You can expect on average 6 hours of sunshine a day in Sellafield during May.

• 15
  15°C max day temperature
• 6
  6 hours of sunshine per day
• 15
  15 days with some rainfall
• 6
  6°C min night temperature
• 92
  92 mm of monthly rainfall

On average 92 mm (3.6 inches) of rain normally falls in Sellafield during May with rain falling on 15 days of the month.

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Sellafield weather in June

The average maximum daytime temperature in Sellafield in June is a comfortable 17°C (63°F), while the average minimum night-time temperature is a cool 9°C (48°F). You can expect on average 6 hours of sunshine a day in Sellafield during June.

• 17
  17°C max day temperature
• 6
  6 hours of sunshine per day
• 15
  15 days with some rainfall
• 9
  9°C min night temperature
• 107
  107 mm of monthly rainfall

On average 107 mm (4.2 inches) of rain normally falls in Sellafield during June with rain falling on 15 days of the month.

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Sellafield weather in July

The average maximum daytime temperature in Sellafield in July is a comfortable 19°C (66°F), while the average minimum night-time temperature is a cool 11°C (52°F). You can expect on average 6 hours of sunshine a day in Sellafield during July.

• 19
  19°C max day temperature
• 6
  6 hours of sunshine per day
• 15
  15 days with some rainfall
• 11
  11°C min night temperature
• 111
  111 mm of monthly rainfall

On average 111 mm (4.4 inches) of rain normally falls in Sellafield during July with rain falling on 15 days of the month.

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Sellafield weather in August

The average maximum daytime temperature in Sellafield in August is a comfortable 19°C (66°F), while the average minimum night-time temperature is a cool 11°C (52°F). You can expect on average 5 hours of sunshine a day in Sellafield during August.

• 19
  19°C max day temperature
• 5
  5 hours of sunshine per day
• 16
  16 days with some rainfall
• 11
  11°C min night temperature
• 139
  139 mm of monthly rainfall

On average 139 mm (5.5 inches) of rain normally falls in Sellafield during August with rain falling on 16 days of the month.

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Sellafield weather in September

The average maximum daytime temperature in Sellafield in September is a comfortable 16°C (61°F), while the average minimum night-time temperature is a cool 9°C (48°F). You can expect on average 4 hours of sunshine a day in Sellafield during September.

• 16
  16°C max day temperature
• 4
  4 hours of sunshine per day
• 16
  16 days with some rainfall
• 9
  9°C min night temperature
• 182
  182 mm of monthly rainfall

On average 182 mm (7.2 inches) of rain normally falls in Sellafield during September with rain falling on 16 days of the month.

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Sellafield weather in October

The average maximum daytime temperature in Sellafield in October is a cool 13°C (55°F), while the average minimum night-time temperature is a cold 6°C (43°F). You can expect on average 3 hours of sunshine a day in Sellafield during October.

• 13
  13°C max day temperature
• 3
  3 hours of sunshine per day
• 19
  19 days with some rainfall
• 6
  6°C min night temperature
• 242
  242 mm of monthly rainfall

On average 242 mm (9.5 inches) of rain normally falls in Sellafield during October with rain falling on 19 days of the month.

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Sellafield weather in November

The average maximum daytime temperature in Sellafield in November is a cool 9°C (48°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 Sellafield during November.

• 9
  9°C max day temperature
• 2
  2 hours of sunshine per day
• 20
  20 days with some rainfall
• 4
  4°C min night temperature
• 233
  233 mm of monthly rainfall

On average 233 mm (9.2 inches) of rain normally falls in Sellafield during November with rain falling on 20 days of the month.

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Sellafield weather in December

The average maximum daytime temperature in Sellafield 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 1 hours of sunshine a day in Sellafield during December.

• 7
  7°C max day temperature
• 1
  1 hour of sunshine per day
• 21
  21 days with some rainfall
• 2
  2°C min night temperature
• 256
  256 mm of monthly rainfall

On average 256 mm (10.1 inches) of rain normally falls in Sellafield during December with rain falling on 21 days of the month.

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