Port Isaac has some of the mildest winter nights among UK towns
A warm July spell here typically peaks at 19.4°C (67°F). From frosty January to warm July, readings climb 16°C. Days of 25°C are scarce: about 3 a year, fewer than in 86% of UK towns. Windscreens need scraping on about 12 mornings a year, the nights the air drops below 0°C.
Met Office 1991–2020 averages for the town itself.
A year in Port Isaac at a glance
Each month’s typical high and low, in °C.
What a year in Port Isaac feels like
Typical highs and lows by season and by month, from the Met Office’s 1991–2020 averages.
About 995 mm of rain a year
November is the wettest month and May the driest. About 31 days a year bring 10 mm (0.4 in) or more.
Rain by month
Millimetres
Sunshine by month
Hours of bright sunshine at Camborne
12 air frosts and 3 days of 25°C a year
On about 12 nights a year the air drops below freezing; days that stay below freezing are rare. About 3 days a year reach 25°C (77°F).
Day counts are 1991–2020 averages from the Met Office’s 2 km grid. The Met Office calls a day of 25°C or more a summer day and a night below 0°C an air frost; ground frosts, on grass, come more often.
The Met Office station at Camborne
Camborne is 34 miles south-west of Port Isaac, 87 m (285 ft) above sea level. It is the nearest of the 37 long-running stations the Met Office publishes in full; at that distance read it for sunshine and the station’s own record, not as the town’s figures.
| Month | High | Low | Rain | Air frosts | Sun (hours) |
|---|---|---|---|---|---|
| January | 9.2°C | 4.9°C | 121 mm | 2.2 | 60 |
| February | 9.1°C | 4.6°C | 95 mm | 2.1 | 82 |
| March | 10.2°C | 5.4°C | 72 mm | 1.1 | 121 |
| April | 12.1°C | 6.6°C | 73 mm | 0.0 | 181 |
| May | 14.5°C | 8.8°C | 61 mm | 0.0 | 208 |
| June | 16.9°C | 11.2°C | 63 mm | 0.0 | 205 |
| July | 18.7°C | 13.2°C | 69 mm | 0.0 | 190 |
| August | 19.0°C | 13.4°C | 79 mm | 0.0 | 180 |
| September | 17.5°C | 12.0°C | 78 mm | 0.0 | 154 |
| October | 14.6°C | 10.0°C | 111 mm | 0.0 | 108 |
| November | 11.8°C | 7.4°C | 130 mm | 0.2 | 68 |
| December | 9.9°C | 5.6°C | 126 mm | 1.7 | 54 |
| Year | 13.6°C | 8.6°C | 1,076 mm | 7 | 1,611 |
Met Office historic station data, Camborne, 1991–2020 months averaged (a month needs 20 of the 30 years; estimated values counted, missing months left out). Sunshine: Kipp & Zonen recorder.
How Port Isaac compares
Against the 2,537 towns and cities of 2,500 or more across the UK, each with its own Met Office averages, and its place among Cornwall towns that size.
Nearby towns’ climate
The nearest towns of 1,000+ within 12 miles: a hill, a valley or the sea can make a real difference over a few miles.
| Town | July high | January low | Rain a year |
|---|---|---|---|
| Port Isaac | 19.4°C | 4.0°C | 995 mm |
| Rock 4.4 mi | 19.7°C about the same | 4.2°C about the same | 978 mm |
| Delabole 4.8 mi | 18.8°C 0.6°C cooler | 3.1°C 0.8°C colder | 1,193 mm |
| Egloshayle 5.1 mi | 20.0°C 0.6°C warmer | 4.0°C about the same | 1,050 mm |
| Wadebridge 5.3 mi | 20.0°C 0.6°C warmer | 4.0°C about the same | 1,050 mm |
| Padstow 6.3 mi | 19.7°C about the same | 4.5°C about the same | 970 mm |
| Camelford 6.7 mi | 18.7°C 0.7°C cooler | 2.9°C 1.1°C colder | 1,406 mm |
Port Isaac weather by month
Average daily high and low, mean temperature and rain, 1991–2020, for the town itself (the Met Office’s HadUK-Grid).
| Month | High | Low | Mean | Rain |
|---|---|---|---|---|
| January | 9.0°C 48°F | 4.0°C 39°F | 6.5°C | 111 mm 4.4 in |
| February | 9.3°C 49°F | 3.9°C 39°F | 6.6°C | 78 mm 3.1 in |
| March | 10.7°C 51°F | 4.7°C 41°F | 7.8°C | 62 mm 2.4 in |
| April | 13.1°C 56°F | 5.9°C 43°F | 9.5°C | 56 mm 2.2 in |
| May | 15.5°C 60°F | 8.3°C 47°F | 12.0°C | 52 mm 2.1 in |
| June | 17.8°C 64°F | 10.7°C 51°F | 14.2°C | 62 mm 2.4 in |
| July | 19.4°C 67°F | 12.7°C 55°F | 16.1°C | 71 mm 2.8 in |
| August | 19.7°C 67°F | 12.9°C 55°F | 16.3°C | 76 mm 3.0 in |
| September | 18.2°C 65°F | 11.5°C 53°F | 14.8°C | 72 mm 2.8 in |
| October | 15.1°C 59°F | 9.2°C 49°F | 12.2°C | 116 mm 4.6 in |
| November | 12.0°C 54°F | 6.7°C 44°F | 9.3°C | 122 mm 4.8 in |
| December | 9.8°C 50°F | 4.8°C 41°F | 7.3°C | 117 mm 4.6 in |
| Year | 14.1°C | 7.9°C | 11.0°C | 995 mm |
Where Port Isaac’s numbers come from
Averages over 30 years, not a forecast.
- Mean temperature, rain and day counts: HadUK-Grid 1991–2020 averages for the Met Office 2 km grid square nearest Port Isaac’s centre (the town is smaller than one square).
- Highs and lows: the Met Office publishes average daily maxima and minima on its 12 km grid; each is moved by the difference between the town’s 2 km mean temperature and the 12 km square’s, which carries the town’s own height and setting over.
- Weather station and sunshine: Met Office historic station data for Camborne, 34 miles away, months of 1991–2020 averaged.
- Comparisons: every town and city of 2,500 or more across the UK, all four nations, read the same way.
Met Office HadUK-Grid · Met Office Climate Data Portal · Historic station data. Open Government Licence v3.0.
Questions about Port Isaac’s climate
How warm does Port Isaac get in summer?
August is the warmest month, with average highs of 19.7°C (67°F). About 3 days a year reach 25°C (77°F), fewer than 86% of UK towns.
How cold does Port Isaac get in winter?
February nights average 3.9°C (39°F). The air drops below freezing on about 12 nights a year, and about under 1 days a year stay below freezing all day.
How much rain does Port Isaac get?
About 995 mm (39 in) a year, more than 78% of UK towns. November is the wettest month (122 mm) and May the driest (52 mm).
How sunny is it?
The nearest Met Office station with a sunshine record, Camborne (34 miles away), averages 1,611 hours of bright sunshine a year. Sunshine isn’t on the town grid, so this is the station’s figure.
Where do these figures come from?
The Met Office’s HadUK-Grid 1991–2020 averages, which turn thousands of weather stations into a map of the UK in 2 km squares; the page reads the squares inside Port Isaac. They are 30-year averages, not a forecast.
Contains Met Office data © Crown copyright 2026, Open Government Licence v3.0. HadUK-Grid 1991–2020 averages via the Met Office Climate Data Portal; station averages from Met Office historic station data. Today’s forecast for Port Isaac →
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