Bethesda weather

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

• Bethesda weather averages
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Bethesda weather averages

Check the Bethesda 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 Bethesda, Gwynedd, Wales.

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Bethesda weather by month

Check the weather for Bethesda, Gwynedd, 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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Bethesda weather in January

The average maximum daytime temperature in Bethesda in January is a cold 7°C (45°F), while the average minimum night-time temperature is a cold 3°C (37°F). You can expect on average 1 hours of sunshine a day in Bethesda during January.

• 7
  7°C max day temperature
• 1
  1 hour of sunshine per day
• 20
  20 days with some rainfall
• 3
  3°C min night temperature
• 128
  128 mm of monthly rainfall

On average 128 mm (5 inches) of rain normally falls in Bethesda during January with rain falling on 20 days of the month.

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Bethesda weather in February

The average maximum daytime temperature in Bethesda 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 Bethesda during February.

• 8
  8°C max day temperature
• 3
  3 hours of sunshine per day
• 17
  17 days with some rainfall
• 3
  3°C min night temperature
• 92
  92 mm of monthly rainfall

On average 92 mm (3.6 inches) of rain normally falls in Bethesda during February with rain falling on 17 days of the month.

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Bethesda weather in March

The average maximum daytime temperature in Bethesda 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 3 hours of sunshine a day in Bethesda during March.

• 9
  9°C max day temperature
• 3
  3 hours of sunshine per day
• 18
  18 days with some rainfall
• 4
  4°C min night temperature
• 105
  105 mm of monthly rainfall

On average 105 mm (4.1 inches) of rain normally falls in Bethesda during March with rain falling on 18 days of the month.

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Bethesda weather in April

The average maximum daytime temperature in Bethesda 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 5 hours of sunshine a day in Bethesda during April.

• 11
  11°C max day temperature
• 5
  5 hours of sunshine per day
• 15
  15 days with some rainfall
• 5
  5°C min night temperature
• 74
  74 mm of monthly rainfall

On average 74 mm (2.9 inches) of rain normally falls in Bethesda during April with rain falling on 15 days of the month.

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Bethesda weather in May

The average maximum daytime temperature in Bethesda in May is a comfortable 15°C (59°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 Bethesda during May.

• 15
  15°C max day temperature
• 6
  6 hours of sunshine per day
• 15
  15 days with some rainfall
• 7
  7°C min night temperature
• 68
  68 mm of monthly rainfall

On average 68 mm (2.7 inches) of rain normally falls in Bethesda during May with rain falling on 15 days of the month.

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Bethesda weather in June

The average maximum daytime temperature in Bethesda 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 6 hours of sunshine a day in Bethesda during June.

• 17
  17°C max day temperature
• 6
  6 hours of sunshine per day
• 14
  14 days with some rainfall
• 10
  10°C min night temperature
• 77
  77 mm of monthly rainfall

On average 77 mm (3 inches) of rain normally falls in Bethesda during June with rain falling on 14 days of the month.

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Bethesda weather in July

The average maximum daytime temperature in Bethesda 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 5 hours of sunshine a day in Bethesda during July.

• 19
  19°C max day temperature
• 5
  5 hours of sunshine per day
• 14
  14 days with some rainfall
• 12
  12°C min night temperature
• 77
  77 mm of monthly rainfall

On average 77 mm (3 inches) of rain normally falls in Bethesda during July with rain falling on 14 days of the month.

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Bethesda weather in August

The average maximum daytime temperature in Bethesda 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 5 hours of sunshine a day in Bethesda during August.

• 19
  19°C max day temperature
• 5
  5 hours of sunshine per day
• 16
  16 days with some rainfall
• 12
  12°C min night temperature
• 94
  94 mm of monthly rainfall

On average 94 mm (3.7 inches) of rain normally falls in Bethesda during August with rain falling on 16 days of the month.

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Bethesda weather in September

The average maximum daytime temperature in Bethesda in September 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 4 hours of sunshine a day in Bethesda during September.

• 17
  17°C max day temperature
• 4
  4 hours of sunshine per day
• 16
  16 days with some rainfall
• 10
  10°C min night temperature
• 112
  112 mm of monthly rainfall

On average 112 mm (4.4 inches) of rain normally falls in Bethesda during September with rain falling on 16 days of the month.

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Bethesda weather in October

The average maximum daytime temperature in Bethesda 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 Bethesda during October.

• 14
  14°C max day temperature
• 3
  3 hours of sunshine per day
• 19
  19 days with some rainfall
• 8
  8°C min night temperature
• 136
  136 mm of monthly rainfall

On average 136 mm (5.4 inches) of rain normally falls in Bethesda during October with rain falling on 19 days of the month.

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Bethesda weather in November

The average maximum daytime temperature in Bethesda in November is a cool 10°C (50°F), while the average minimum night-time temperature is a cold 5°C (41°F). You can expect on average 2 hours of sunshine a day in Bethesda during November.

• 10
  10°C max day temperature
• 2
  2 hours of sunshine per day
• 21
  21 days with some rainfall
• 5
  5°C min night temperature
• 151
  151 mm of monthly rainfall

On average 151 mm (5.9 inches) of rain normally falls in Bethesda during November with rain falling on 21 days of the month.

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Bethesda weather in December

The average maximum daytime temperature in Bethesda in December is a cool 8°C (46°F), while the average minimum night-time temperature is a cold 4°C (39°F). You can expect on average 1 hours of sunshine a day in Bethesda during December.

• 8
  8°C max day temperature
• 1
  1 hour of sunshine per day
• 21
  21 days with some rainfall
• 4
  4°C min night temperature
• 145
  145 mm of monthly rainfall

On average 145 mm (5.7 inches) of rain normally falls in Bethesda during December with rain falling on 21 days of the month.

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