Johnston weather

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

• Johnston weather averages
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Johnston weather averages

Check the Johnston 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 Johnston, Pembrokeshire, Wales.

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Johnston weather by month

Check the weather for Johnston, Pembrokeshire, Wales 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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Johnston weather in January

The average maximum daytime temperature in Johnston in January is a cool 8°C (46°F), while the average minimum night-time temperature is a cold 3°C (37°F). You can expect on average 2 hours of sunshine a day in Johnston during January.

• 8
  8°C max day temperature
• 2
  2 hours of sunshine per day
• 20
  20 days with some rainfall
• 3
  3°C min night temperature
• 123
  123 mm of monthly rainfall

On average 123 mm (4.8 inches) of rain normally falls in Johnston during January with rain falling on 20 days of the month.

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Johnston weather in February

The average maximum daytime temperature in Johnston in February is a cool 8°C (46°F), while the average minimum night-time temperature is a cold 3°C (37°F). You can expect on average 3 hours of sunshine a day in Johnston during February.

• 8
  8°C max day temperature
• 3
  3 hours of sunshine per day
• 16
  16 days with some rainfall
• 3
  3°C min night temperature
• 86
  86 mm of monthly rainfall

On average 86 mm (3.4 inches) of rain normally falls in Johnston during February with rain falling on 16 days of the month.

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Johnston weather in March

The average maximum daytime temperature in Johnston in March 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 4 hours of sunshine a day in Johnston during March.

• 9
  9°C max day temperature
• 4
  4 hours of sunshine per day
• 17
  17 days with some rainfall
• 4
  4°C min night temperature
• 91
  91 mm of monthly rainfall

On average 91 mm (3.6 inches) of rain normally falls in Johnston during March with rain falling on 17 days of the month.

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Johnston weather in April

The average maximum daytime temperature in Johnston in April is a cool 11°C (52°F), while the average minimum night-time temperature is a cold 5°C (41°F). You can expect on average 6 hours of sunshine a day in Johnston during April.

• 11
  11°C max day temperature
• 6
  6 hours of sunshine per day
• 13
  13 days with some rainfall
• 5
  5°C min night temperature
• 68
  68 mm of monthly rainfall

On average 68 mm (2.7 inches) of rain normally falls in Johnston during April with rain falling on 13 days of the month.

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Johnston weather in May

The average maximum daytime temperature in Johnston in May is a comfortable 15°C (59°F), while the average minimum night-time temperature is a cool 8°C (46°F). You can expect on average 7 hours of sunshine a day in Johnston during May.

• 15
  15°C max day temperature
• 7
  7 hours of sunshine per day
• 13
  13 days with some rainfall
• 8
  8°C min night temperature
• 60
  60 mm of monthly rainfall

On average 60 mm (2.4 inches) of rain normally falls in Johnston during May with rain falling on 13 days of the month.

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Johnston weather in June

The average maximum daytime temperature in Johnston in June is a comfortable 17°C (63°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 Johnston during June.

• 17
  17°C max day temperature
• 7
  7 hours of sunshine per day
• 13
  13 days with some rainfall
• 10
  10°C min night temperature
• 74
  74 mm of monthly rainfall

On average 74 mm (2.9 inches) of rain normally falls in Johnston during June with rain falling on 13 days of the month.

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Johnston weather in July

The average maximum daytime temperature in Johnston in July is a comfortable 19°C (66°F), while the average minimum night-time temperature is a cool 12°C (54°F). You can expect on average 7 hours of sunshine a day in Johnston during July.

• 19
  19°C max day temperature
• 7
  7 hours of sunshine per day
• 12
  12 days with some rainfall
• 12
  12°C min night temperature
• 66
  66 mm of monthly rainfall

On average 66 mm (2.6 inches) of rain normally falls in Johnston during July with rain falling on 12 days of the month.

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Johnston weather in August

The average maximum daytime temperature in Johnston in August is a comfortable 19°C (66°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 Johnston during August.

• 19
  19°C max day temperature
• 6
  6 hours of sunshine per day
• 14
  14 days with some rainfall
• 12
  12°C min night temperature
• 97
  97 mm of monthly rainfall

On average 97 mm (3.8 inches) of rain normally falls in Johnston during August with rain falling on 14 days of the month.

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Johnston weather in September

The average maximum daytime temperature in Johnston in September is a comfortable 17°C (63°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 Johnston during September.

• 17
  17°C max day temperature
• 5
  5 hours of sunshine per day
• 15
  15 days with some rainfall
• 11
  11°C min night temperature
• 103
  103 mm of monthly rainfall

On average 103 mm (4.1 inches) of rain normally falls in Johnston during September with rain falling on 15 days of the month.

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Johnston weather in October

The average maximum daytime temperature in Johnston in October is a comfortable 14°C (57°F), while the average minimum night-time temperature is a cool 8°C (46°F). You can expect on average 3 hours of sunshine a day in Johnston during October.

• 14
  14°C max day temperature
• 3
  3 hours of sunshine per day
• 18
  18 days with some rainfall
• 8
  8°C min night temperature
• 129
  129 mm of monthly rainfall

On average 129 mm (5.1 inches) of rain normally falls in Johnston during October with rain falling on 18 days of the month.

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Johnston weather in November

The average maximum daytime temperature in Johnston in November is a cool 10°C (50°F), while the average minimum night-time temperature is a cold 6°C (43°F). You can expect on average 2 hours of sunshine a day in Johnston during November.

• 10
  10°C max day temperature
• 2
  2 hours of sunshine per day
• 19
  19 days with some rainfall
• 6
  6°C min night temperature
• 133
  133 mm of monthly rainfall

On average 133 mm (5.2 inches) of rain normally falls in Johnston during November with rain falling on 19 days of the month.

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Johnston weather in December

The average maximum daytime temperature in Johnston in December 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 Johnston during December.

• 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
• 138
  138 mm of monthly rainfall

On average 138 mm (5.4 inches) of rain normally falls in Johnston during December with rain falling on 20 days of the month.

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