January in Clyst St Mary stays gentler than in 91% of UK towns
July afternoons average 21.8°C (71°F). Wet weather is most frequent in November and least in July. The outdoor season runs from June to September, with highs of 19–22°C.
Met Office 1991–2020 averages for the town itself.
A year in Clyst St Mary at a glance
Each month’s typical high and low, in °C.
What a year in Clyst St Mary feels like
Typical highs and lows by season and by month, from the Met Office’s 1991–2020 averages.
About 825 mm of rain a year
November is the wettest month and July the driest. About 24 days a year bring 10 mm (0.4 in) or more.
Rain by month
Millimetres
35 air frosts and 9 days of 25°C a year
On about 35 nights a year the air drops below freezing; days that stay below freezing are rare. About 9 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 Chivenor
Chivenor is 40 miles north-west of Clyst St Mary, 6 m (20 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 |
|---|---|---|---|---|
| January | 9.1°C | 3.6°C | 91 mm | 5.4 |
| February | 9.4°C | 3.4°C | 70 mm | 5.0 |
| March | 11.2°C | 4.5°C | 60 mm | 2.6 |
| April | 13.7°C | 5.9°C | 56 mm | 0.9 |
| May | 16.5°C | 8.6°C | 55 mm | 0.0 |
| June | 19.0°C | 11.4°C | 68 mm | 0.0 |
| July | 20.7°C | 13.3°C | 74 mm | 0.0 |
| August | 20.5°C | 13.4°C | 77 mm | 0.0 |
| September | 18.8°C | 11.5°C | 70 mm | 0.0 |
| October | 15.4°C | 9.1°C | 107 mm | 0.4 |
| November | 12.1°C | 6.2°C | 106 mm | 1.8 |
| December | 9.9°C | 4.3°C | 107 mm | 4.6 |
| Year | 14.7°C | 7.9°C | 941 mm | 21 |
Met Office historic station data, Chivenor, 1991–2020 months averaged (a month needs 20 of the 30 years; estimated values counted, missing months left out). Sunshine: Campbell-Stokes recorder.
How Clyst St Mary 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 Devon 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 |
|---|---|---|---|
| Clyst St Mary | 21.8°C | 2.8°C | 825 mm |
| Topsham 1.6 mi | 21.8°C about the same | 2.9°C about the same | 834 mm |
| Clyst Honiton 1.9 mi | 21.6°C about the same | 2.6°C about the same | 846 mm |
| West Clyst 2.7 mi | 21.5°C about the same | 2.7°C about the same | 865 mm |
| Exminster 2.8 mi | 21.8°C about the same | 2.9°C about the same | 834 mm |
| Exeter 2.9 mi | 21.6°C about the same | 2.8°C about the same | 873 mm |
| Exton 3.1 mi | 21.7°C about the same | 2.9°C about the same | 866 mm |
Clyst St Mary 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 | 2.8°C 37°F | 5.9°C | 82 mm 3.2 in |
| February | 9.3°C 49°F | 2.7°C 37°F | 6.0°C | 65 mm 2.6 in |
| March | 11.3°C 52°F | 3.9°C 39°F | 7.6°C | 64 mm 2.5 in |
| April | 14.1°C 57°F | 5.3°C 42°F | 9.6°C | 62 mm 2.5 in |
| May | 16.9°C 62°F | 7.7°C 46°F | 12.3°C | 51 mm 2.0 in |
| June | 19.9°C 68°F | 10.6°C 51°F | 15.2°C | 54 mm 2.1 in |
| July | 21.8°C 71°F | 12.3°C 54°F | 17.0°C | 47 mm 1.8 in |
| August | 21.6°C 71°F | 12.3°C 54°F | 16.9°C | 60 mm 2.3 in |
| September | 19.2°C 67°F | 10.6°C 51°F | 14.9°C | 57 mm 2.2 in |
| October | 15.6°C 60°F | 8.2°C 47°F | 11.9°C | 89 mm 3.5 in |
| November | 12.1°C 54°F | 5.1°C 41°F | 8.6°C | 100 mm 3.9 in |
| December | 9.4°C 49°F | 3.4°C 38°F | 6.3°C | 95 mm 3.7 in |
| Year | 15.0°C | 7.1°C | 11.0°C | 825 mm |
Where Clyst St Mary’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 Clyst St Mary’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 Chivenor, 40 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 Clyst St Mary’s climate
How warm does Clyst St Mary get in summer?
July is the warmest month, with average highs of 21.8°C (71°F). About 9 days a year reach 25°C (77°F), fewer than 59% of UK towns.
How cold does Clyst St Mary get in winter?
February nights average 2.7°C (37°F). The air drops below freezing on about 35 nights a year, and about under 1 days a year stay below freezing all day.
How much rain does Clyst St Mary get?
About 825 mm (32 in) a year, more than 58% of UK towns. November is the wettest month (100 mm) and July the driest (47 mm).
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 Clyst St Mary. 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 Clyst St Mary →
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.