Castleton weather
The Castleton weather guide shows monthly weather averages (including daytime and night-time temperatures, rainfall and hours of sunshine) for holidays in Castleton, Newport Area, Wales in 2026/2027.
Castleton weather averages
Check the Castleton 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 Castleton, Newport Area, Wales.
Castleton weather by month
Check the weather for Castleton, Newport Area, 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.
Castleton weather in January
The average maximum daytime temperature in Castleton 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 Castleton during January.
- 6°C max day temperature
6 - 2 hours of sunshine per day
2 - 20 days with some rainfall
20 - 1°C min night temperature
1 - 165 mm of monthly rainfall
165
On average 165 mm (6.5 inches) of rain normally falls in Castleton during January with rain falling on 20 days of the month.
Castleton weather in February
The average maximum daytime temperature in Castleton 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 Castleton during February.
- 7°C max day temperature7
- 2 hours of sunshine per day2
- 16 days with some rainfall
16 - 1°C min night temperature1
- 120 mm of monthly rainfall
120
On average 120 mm (4.7 inches) of rain normally falls in Castleton during February with rain falling on 16 days of the month.
Castleton weather in March
The average maximum daytime temperature in Castleton 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 4 hours of sunshine a day in Castleton during March.
- 9°C max day temperature
9 - 4 hours of sunshine per day
4 - 18 days with some rainfall18
- 2°C min night temperature2
- 114 mm of monthly rainfall114
On average 114 mm (4.5 inches) of rain normally falls in Castleton during March with rain falling on 18 days of the month.
Castleton weather in April
The average maximum daytime temperature in Castleton 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 Castleton during April.
- 11°C max day temperature11
- 5 hours of sunshine per day
5 - 15 days with some rainfall
15 - 4°C min night temperature4
- 86 mm of monthly rainfall
86
On average 86 mm (3.4 inches) of rain normally falls in Castleton during April with rain falling on 15 days of the month.
Castleton weather in May
The average maximum daytime temperature in Castleton 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 Castleton during May.
- 15°C max day temperature
15 - 6 hours of sunshine per day
6 - 14 days with some rainfall14
- 6°C min night temperature6
- 80 mm of monthly rainfall
80
On average 80 mm (3.1 inches) of rain normally falls in Castleton during May with rain falling on 14 days of the month.
Castleton weather in June
The average maximum daytime temperature in Castleton in June is a comfortable 18°C (64°F), while the average minimum night-time temperature is a cool 9°C (48°F). You can expect on average 7 hours of sunshine a day in Castleton during June.
- 18°C max day temperature
18 - 7 hours of sunshine per day
7 - 14 days with some rainfall14
- 9°C min night temperature9
- 80 mm of monthly rainfall80
On average 80 mm (3.1 inches) of rain normally falls in Castleton during June with rain falling on 14 days of the month.
Castleton weather in July
The average maximum daytime temperature in Castleton in July is a comfortable 20°C (68°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 Castleton during July.
- 20°C max day temperature20
- 6 hours of sunshine per day6
- 13 days with some rainfall13
- 11°C min night temperature11
- 68 mm of monthly rainfall68
On average 68 mm (2.7 inches) of rain normally falls in Castleton during July with rain falling on 13 days of the month.
Castleton weather in August
The average maximum daytime temperature in Castleton in August is a comfortable 20°C (68°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 Castleton during August.
- 20°C max day temperature20
- 6 hours of sunshine per day6
- 15 days with some rainfall15
- 11°C min night temperature11
- 97 mm of monthly rainfall97
On average 97 mm (3.8 inches) of rain normally falls in Castleton during August with rain falling on 15 days of the month.
Castleton weather in September
The average maximum daytime temperature in Castleton in September 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 5 hours of sunshine a day in Castleton during September.
- 17°C max day temperature17
- 5 hours of sunshine per day5
- 15 days with some rainfall15
- 9°C min night temperature9
- 112 mm of monthly rainfall112
On average 112 mm (4.4 inches) of rain normally falls in Castleton during September with rain falling on 15 days of the month.
Castleton weather in October
The average maximum daytime temperature in Castleton in October is a cool 13°C (55°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 Castleton during October.
- 13°C max day temperature
13 - 3 hours of sunshine per day
3 - 18 days with some rainfall18
- 7°C min night temperature7
- 138 mm of monthly rainfall
138
On average 138 mm (5.4 inches) of rain normally falls in Castleton during October with rain falling on 18 days of the month.
Castleton weather in November
The average maximum daytime temperature in Castleton 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 Castleton during November.
- 9°C max day temperature9
- 2 hours of sunshine per day2
- 19 days with some rainfall19
- 4°C min night temperature4
- 146 mm of monthly rainfall
146
On average 146 mm (5.7 inches) of rain normally falls in Castleton during November with rain falling on 19 days of the month.
Castleton weather in December
The average maximum daytime temperature in Castleton 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 Castleton during December.
- 7°C max day temperature7
- 2 hours of sunshine per day2
- 19 days with some rainfall19
- 2°C min night temperature2
- 168 mm of monthly rainfall168
On average 168 mm (6.6 inches) of rain normally falls in Castleton during December with rain falling on 19 days of the month.