Blackwater weather
The Blackwater weather guide shows monthly weather averages (including daytime and night-time temperatures, rainfall and hours of sunshine) for holidays in Blackwater, Cornwall, England in 2026/2027.
Blackwater weather averages
Check the Blackwater 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 Blackwater, Cornwall, England.
Blackwater weather by month
Check the weather for Blackwater, Cornwall, 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.
Blackwater weather in January
The average maximum daytime temperature in Blackwater in January 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 Blackwater during January.
- 9°C max day temperature
9 - 2 hours of sunshine per day
2 - 21 days with some rainfall
21 - 4°C min night temperature
4 - 138 mm of monthly rainfall
138
On average 138 mm (5.4 inches) of rain normally falls in Blackwater during January with rain falling on 21 days of the month.
Blackwater weather in February
The average maximum daytime temperature in Blackwater in February 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 Blackwater during February.
- 9°C max day temperature9
- 3 hours of sunshine per day
3 - 17 days with some rainfall
17 - 4°C min night temperature4
- 106 mm of monthly rainfall
106
On average 106 mm (4.2 inches) of rain normally falls in Blackwater during February with rain falling on 17 days of the month.
Blackwater weather in March
The average maximum daytime temperature in Blackwater in March 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 4 hours of sunshine a day in Blackwater during March.
- 10°C max day temperature10
- 4 hours of sunshine per day
4 - 17 days with some rainfall17
- 5°C min night temperature5
- 93 mm of monthly rainfall
93
On average 93 mm (3.7 inches) of rain normally falls in Blackwater during March with rain falling on 17 days of the month.
Blackwater weather in April
The average maximum daytime temperature in Blackwater in April is a cool 12°C (54°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 Blackwater during April.
- 12°C max day temperature
12 - 6 hours of sunshine per day
6 - 14 days with some rainfall
14 - 6°C min night temperature6
- 68 mm of monthly rainfall
68
On average 68 mm (2.7 inches) of rain normally falls in Blackwater during April with rain falling on 14 days of the month.
Blackwater weather in May
The average maximum daytime temperature in Blackwater 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 Blackwater during May.
- 15°C max day temperature
15 - 7 hours of sunshine per day
7 - 13 days with some rainfall13
- 8°C min night temperature8
- 64 mm of monthly rainfall64
On average 64 mm (2.5 inches) of rain normally falls in Blackwater during May with rain falling on 13 days of the month.
Blackwater weather in June
The average maximum daytime temperature in Blackwater in June 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 7 hours of sunshine a day in Blackwater during June.
- 17°C max day temperature17
- 7 hours of sunshine per day7
- 12 days with some rainfall
12 - 11°C min night temperature11
- 67 mm of monthly rainfall67
On average 67 mm (2.6 inches) of rain normally falls in Blackwater during June with rain falling on 12 days of the month.
Blackwater weather in July
The average maximum daytime temperature in Blackwater in July is a comfortable 19°C (66°F), while the average minimum night-time temperature is a cool 13°C (55°F). You can expect on average 7 hours of sunshine a day in Blackwater during July.
- 19°C max day temperature
19 - 7 hours of sunshine per day7
- 12 days with some rainfall12
- 13°C min night temperature13
- 60 mm of monthly rainfall
60
On average 60 mm (2.4 inches) of rain normally falls in Blackwater during July with rain falling on 12 days of the month.
Blackwater weather in August
The average maximum daytime temperature in Blackwater in August is a comfortable 19°C (66°F), while the average minimum night-time temperature is a cool 13°C (55°F). You can expect on average 6 hours of sunshine a day in Blackwater during August.
- 19°C max day temperature19
- 6 hours of sunshine per day6
- 14 days with some rainfall14
- 13°C min night temperature13
- 79 mm of monthly rainfall79
On average 79 mm (3.1 inches) of rain normally falls in Blackwater during August with rain falling on 14 days of the month.
Blackwater weather in September
The average maximum daytime temperature in Blackwater 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 Blackwater during September.
- 17°C max day temperature17
- 5 hours of sunshine per day
5 - 15 days with some rainfall15
- 11°C min night temperature11
- 88 mm of monthly rainfall88
On average 88 mm (3.5 inches) of rain normally falls in Blackwater during September with rain falling on 15 days of the month.
Blackwater weather in October
The average maximum daytime temperature in Blackwater in October is a comfortable 14°C (57°F), while the average minimum night-time temperature is a cool 9°C (48°F). You can expect on average 3 hours of sunshine a day in Blackwater during October.
- 14°C max day temperature14
- 3 hours of sunshine per day3
- 18 days with some rainfall18
- 9°C min night temperature9
- 119 mm of monthly rainfall119
On average 119 mm (4.7 inches) of rain normally falls in Blackwater during October with rain falling on 18 days of the month.
Blackwater weather in November
The average maximum daytime temperature in Blackwater in November is a cool 11°C (52°F), while the average minimum night-time temperature is a cold 7°C (45°F). You can expect on average 2 hours of sunshine a day in Blackwater during November.
- 11°C max day temperature11
- 2 hours of sunshine per day2
- 20 days with some rainfall20
- 7°C min night temperature7
- 136 mm of monthly rainfall136
On average 136 mm (5.4 inches) of rain normally falls in Blackwater during November with rain falling on 20 days of the month.
Blackwater weather in December
The average maximum daytime temperature in Blackwater in December 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 Blackwater during December.
- 10°C max day temperature10
- 2 hours of sunshine per day2
- 21 days with some rainfall21
- 6°C min night temperature6
- 143 mm of monthly rainfall
143
On average 143 mm (5.6 inches) of rain normally falls in Blackwater during December with rain falling on 21 days of the month.