St Just sits near the bottom of UK towns for frosts
High summer brings afternoon highs near 18.7°C (66°F). Summers stay cool: July afternoons here are cooler than in 95% of UK towns. Temperatures cover 14°C across the year, low to high. Warm coats and heating bills mark the months from November to April, when means dip under 10°C.
Met Office 1991–2020 averages for the town itself.
A year in St Just at a glance
Each month’s typical high and low, in °C.
What a year in St Just feels like
Typical highs and lows by season and by month, from the Met Office’s 1991–2020 averages.
About 1,072 mm of rain a year
December is the wettest month and June 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
6 air frosts and under 1 days of 25°C a year
On about 6 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 17 miles east of St Just, 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 St Just 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 |
|---|---|---|---|
| St Just | 18.7°C | 5.0°C | 1,072 mm |
| Newlyn 5.9 mi | 19.2°C 0.5°C warmer | 5.2°C about the same | 1,228 mm |
| Penzance 6.2 mi | 19.2°C 0.5°C warmer | 5.3°C about the same | 1,221 mm |
| Longrock 7.0 mi | 19.0°C about the same | 5.0°C about the same | 1,210 mm |
| Crowlas 9.2 mi | 19.0°C about the same | 4.9°C about the same | 1,216 mm |
| Marazion 9.5 mi | 19.3°C 0.6°C warmer | 5.2°C about the same | 1,094 mm |
| St Ives 10.5 mi | 18.8°C about the same | 5.1°C about the same | 1,205 mm |
St Just 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 | 9.6°C 49°F | 5.0°C 41°F | 7.3°C | 109 mm 4.3 in |
| February | 9.5°C 49°F | 4.8°C 41°F | 7.2°C | 101 mm 4.0 in |
| March | 10.3°C 51°F | 5.3°C 41°F | 7.8°C | 79 mm 3.1 in |
| April | 12.2°C 54°F | 6.3°C 43°F | 9.2°C | 64 mm 2.5 in |
| May | 14.6°C 58°F | 8.5°C 47°F | 11.5°C | 58 mm 2.3 in |
| June | 17.0°C 63°F | 10.9°C 52°F | 13.9°C | 55 mm 2.2 in |
| July | 18.7°C 66°F | 12.7°C 55°F | 15.6°C | 73 mm 2.9 in |
| August | 18.8°C 66°F | 13.0°C 55°F | 15.8°C | 100 mm 3.9 in |
| September | 17.6°C 64°F | 11.8°C 53°F | 14.7°C | 74 mm 2.9 in |
| October | 14.9°C 59°F | 10.0°C 50°F | 12.5°C | 112 mm 4.4 in |
| November | 12.3°C 54°F | 7.6°C 46°F | 9.9°C | 118 mm 4.6 in |
| December | 10.5°C 51°F | 5.9°C 43°F | 8.2°C | 130 mm 5.1 in |
| Year | 13.8°C | 8.5°C | 11.1°C | 1,072 mm |
Where St Just’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 St Just’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, 17 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 St Just’s climate
How warm does St Just get in summer?
August is the warmest month, with average highs of 18.8°C (66°F). About under 1 days a year reach 25°C (77°F), fewer than almost every UK town.
How cold does St Just get in winter?
February nights average 4.8°C (41°F). The air drops below freezing on about 6 nights a year, and about under 1 days a year stay below freezing all day.
How much rain does St Just get?
About 1,072 mm (42 in) a year, more than 83% of UK towns. December is the wettest month (130 mm) and June the driest (55 mm).
How sunny is it?
The nearest Met Office station with a sunshine record, Camborne (17 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 St Just. 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 St Just →
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