Few UK towns have milder winter nights than Porthtowan
Midsummer highs settle at about 19.1°C (66°F). Its July afternoons stay fresher than in 90% of UK towns. The gap between a January night and a July afternoon is 15°C. Homes need heating from November to April, the months averaging under 10°C.
Met Office 1991–2020 averages for the town itself.
A year in Porthtowan at a glance
Each month’s typical high and low, in °C.
What a year in Porthtowan feels like
Typical highs and lows by season and by month, from the Met Office’s 1991–2020 averages.
About 1,071 mm of rain a year
November is the wettest month and June the driest. About 30 days a year bring 10 mm (0.4 in) or more.
Rain by month
Millimetres
Sunshine by month
Hours of bright sunshine at Camborne
7 air frosts and under 1 days of 25°C a year
On about 7 nights a year the air drops below freezing; days that stay below freezing are rare. About under 1 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 6.2 miles south-west of Porthtowan, 87 m (285 ft) above sea level. It is the nearest of the 37 long-running stations the Met Office publishes in full.
| 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 Porthtowan 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 |
|---|---|---|---|
| Porthtowan | 19.1°C | 4.9°C | 1,071 mm |
| Mount Hawke 1.4 mi | 19.4°C about the same | 4.4°C 0.5°C colder | 1,074 mm |
| St Agnes 2.3 mi | 18.9°C about the same | 4.5°C about the same | 1,045 mm |
| Portreath 2.7 mi | 19.2°C about the same | 5.3°C about the same | 1,086 mm |
| Redruth 3.6 mi | 19.6°C 0.5°C warmer | 4.1°C 0.8°C colder | 1,105 mm |
| Illogan 3.6 mi | 19.2°C about the same | 4.5°C about the same | 1,101 mm |
| Pool and Illogan 3.9 mi | 19.2°C about the same | 4.7°C about the same | 1,098 mm |
Porthtowan 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 | 9.7°C 49°F | 4.9°C 41°F | 7.3°C | 113 mm 4.4 in |
| February | 9.3°C 49°F | 4.2°C 39°F | 6.7°C | 93 mm 3.7 in |
| March | 10.5°C 51°F | 5.0°C 41°F | 7.8°C | 72 mm 2.8 in |
| April | 12.5°C 54°F | 5.8°C 42°F | 9.2°C | 71 mm 2.8 in |
| May | 15.0°C 59°F | 8.4°C 47°F | 11.7°C | 62 mm 2.4 in |
| June | 17.5°C 63°F | 11.0°C 52°F | 14.2°C | 59 mm 2.3 in |
| July | 19.1°C 66°F | 12.9°C 55°F | 16.0°C | 69 mm 2.7 in |
| August | 19.1°C 66°F | 13.1°C 56°F | 16.2°C | 80 mm 3.1 in |
| September | 17.7°C 64°F | 11.6°C 53°F | 14.7°C | 76 mm 3.0 in |
| October | 14.9°C 59°F | 9.5°C 49°F | 12.2°C | 115 mm 4.5 in |
| November | 12.0°C 54°F | 6.9°C 44°F | 9.5°C | 134 mm 5.3 in |
| December | 10.1°C 50°F | 5.2°C 41°F | 7.6°C | 129 mm 5.1 in |
| Year | 14.0°C | 8.2°C | 11.1°C | 1,071 mm |
Where Porthtowan’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 Porthtowan’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, 6.2 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 Porthtowan’s climate
How warm does Porthtowan get in summer?
August is the warmest month, with average highs of 19.1°C (66°F). About under 1 days a year reach 25°C (77°F), fewer than 98% of UK towns.
How cold does Porthtowan get in winter?
February nights average 4.2°C (39°F). The air drops below freezing on about 7 nights a year, and about under 1 days a year stay below freezing all day.
How much rain does Porthtowan get?
About 1,071 mm (42 in) a year, more than 82% of UK towns. November is the wettest month (134 mm) and June the driest (59 mm).
How sunny is it?
The nearest Met Office station with a sunshine record, Camborne (6.2 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 Porthtowan. 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 Porthtowan →
Contains public sector information licensed under the Open Government Licence v3.0. Contains HM Land Registry data © Crown copyright and database right 2026. Contains OS data © Crown copyright and database right 2026 (ONS boundaries). Northern Ireland: Source: NISRA; contains Land & Property Services data and Ordnance Survey of Northern Ireland information, © Crown copyright, licensed under the Open Government Licence v3.0. Scotland: contains National Records of Scotland data, Registers of Scotland data and SEPA data, © Crown copyright / © SEPA 2025, licensed under the Open Government Licence v3.0.