Cornwall weather and climate in 2025
Day
22 °C
Night
10 °C
Sea
0 °C
Precipitation
92 mm
in month
Rainy days
12 days
in month
Daylight
12 hours
average
Sunshine
5 hours
average
Humidity
77 %
Day
22 °C
Night
10 °C
Sea
0 °C
Precipitation
92 mm
in month
Rainy days
12 days
in month
Daylight
12 hours
average
Sunshine
5 hours
average
Humidity
77 %
Overview: Cornwall
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Weather overview for Cornwall
Weather overview
Cornwall's climate ranges from chilly, snowy winters to warm summers. With a yearly average of 14 days rainy days, the region has variable precipitation levels; January typically brings the coldest days peaking at around -4 °C (25 °F), while July offers the comfort of 27 °C (80 °F) warmth. Despite the absence of sea temperature data—owing to Cornwall's inland location—the seasonal variations in weather affect wardrobe choices significantly. Throughout the year, the wind generally flows at a steady pace, and humidity levels tend to be higher in winter, with sun hours increasing steadily towards the mid-year.
January weather
January in Cornwall sees the height of winter chill with an average daytime temperature of -4 °C (25 °F) and night lows bottoming out at -14 °C (7 °F). A fresh blanket of snow often covers the streets as precipitation levels reach 75 mm (2.94 in), accompanied by a relatively high number of rainy days at 14 days.
February weather
February in Cornwall offers a slight climb in temperature, but with an average high of -2 °C (28 °F), it's still necessary to bundle up. Night temperatures lean on the frigid side at -12 °C (10 °F), and precipitation remains significant at 60 mm (2.38 in).
March weather
The arrival of March in Cornwall brings milder weather with daytime temperatures reaching an average of 3 °C (38 °F). Night temperatures also rise slightly to -6 °C (20 °F), and rain falls across 11 days of the month.
April weather
April's springtime in Cornwall is marked by a notable increase in temperature to an average daytime high of 12 °C (54 °F), while the nightly lows linger at around 1 °C (34 °F). Rainfall amounts to 81 mm (3.19 in), spreading out over 12 days.
May weather
The prelude to summer in Cornwall is May, showcasing an average high temperature of 19 °C (66 °F) during the day and a comfortable 7 °C (44 °F) at night. With rainfall expected to be 85 mm (3.34 in), May features 13 days rainy days.
June weather
As summer takes hold in Cornwall, June boasts warm temperatures averaging 24 °C (75 °F) by day, paired with mild nightly averages of 12 °C (54 °F). Despite being summer, rainfall is at its peak with 102 mm (4.01 in), and there are 13 days rainy days.
July weather
July in Cornwall is the epitome of summer with peak temperatures averaging 27 °C (80 °F) during the day. Night temperatures also rise to a balmy 15 °C (60 °F). Rainfall slightly subsides but still accumulates to 97 mm (3.80 in) over 12 days.
August weather
August in Cornwall continues to celebrate summer with similar temperatures to July, averaging 26 °C (79 °F) during the day and 14 °C (58 °F) at night. Although there's less rainfall at 89 mm (3.51 in), expect 11 days of rainy days.
September weather
September sees a start to the cool-down in Cornwall with daytime temperatures dipping to an average of 22 °C (71 °F). As the nights draw in, expect averages around 10 °C (50 °F), and prepare for 92 mm (3.60 in) of rain over 12 days.
October weather
October brings a more pronounced autumnal chill to Cornwall, with average highs at 14 °C (58 °F) and night temperatures chilling to 4 °C (39 °F). Accompanied by 98 mm (3.87 in) of rain over 12 days, the weather becomes more variable.
November weather
November in Cornwall ushers in a colder temperament with daytime averages around 7 °C (44 °F) and night temperatures falling to -1 °C (30 °F). Despite the drop in temperature, rainfall remains plentiful at 87 mm (3.42 in), spanning over 13 days.
December weather
Cornwall's December is characterized by the onset of wintry conditions with average daily highs at a chilly -1 °C (31 °F) and nighttime lows of -9 °C (16 °F). An average of 69 mm (2.71 in) of precipitation falls over 14 days.
FAQs
How should one dress for the January weather in Cornwall?
Dressing for January weather in Cornwall means layering up. Warm coats, scarves, hats, and gloves are essential to combat the cold daytime temperatures averaging -4 °C (25 °F); don't forget waterproof boots for the snow and rain.
Does Cornwall get a lot of rain in February?
February in Cornwall is fairly wet with an average of 11 days rainy days and a notable amount of rainfall at 60 mm (2.38 in); it's a good idea to keep an umbrella close at hand.
What's the weather like in Cornwall during March?
March weather in Cornwall is a transition towards spring, with higher daytime temperatures averaging 3 °C (38 °F) and nighttime still cool, averaging -6 °C (20 °F). Mild winds at 4 m/s and moderate precipitation keep the month dynamic.
Is April a good month for outdoor activities in Cornwall?
April is a pleasant month for outdoor activities in Cornwall with an increase in daily temperatures to an average high of 12 °C (54 °F); the evenings are cooler, prompting the need for a light jacket.
What does typical May weather feel like in Cornwall?
May in Cornwall feels increasingly warm with average daytime highs at 19 °C (66 °F) while evenings are mild, inviting for light layers. Go ahead and plan some picnics and hikes, but keep an eye on the sky for rain.
What kind of temperatures can be expected in Cornwall in June?
Expect pleasantly warm weather throughout June in Cornwall with daytime temperatures hovering around the 24 °C (75 °F) mark, which is ideal for enjoying a host of outdoor activities.
How warm is Cornwall in July?
Cornwall experiences its warmest weather in July, with typical daytime temperatures averaging a hot 27 °C (80 °F). It's an excellent month to enjoy summer activities outdoors in the region.
What's the typical daytime temperature in Cornwall in August?
August in Cornwall provides warm and sunshine-filled days with an average daytime temperature of 26 °C (79 °F), making it perfect for savoring the outdoors before autumn arrives.
What type of weather is September known for in Cornwall?
September weather in Cornwall is marked by a noticeable dip in temperature to a comfortable 22 °C (71 °F) during the day, signaling the approach of autumn and cooler days ahead.
As temperatures drop, what should I wear in Cornwall during October?
October's cooler climes mean dressing in layers; warm sweaters, a versatile jacket, and perhaps a scarf and gloves become essential as Cornwall's daytime highs average 14 °C (58 °F) with evenings cooling off to 4 °C (39 °F).
How does the weather in Cornwall change as winter approaches in November?
November's weather in Cornwall is a prelude to winter, featuring falling daytime temperatures that average 7 °C (44 °F) and even colder nights at -1 °C (30 °F); layering becomes increasingly vital.
What temperatures can I expect in Cornwall during December?
Expect winter's chill to take hold in December with chilly daytime temperatures averaging -1 °C (31 °F) in Cornwall; the frigid nights at -9 °C (16 °F) will have you reaching for those winter coats.
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