Ilminster has milder winter nights than 92% of UK towns
Expect July afternoons of about 21.7°C (71°F). Of all months, December brings the most rain and July the least. By rainfall alone, it ranks wetter than 68% of UK towns. For walks and days out, the stretch from June to September brings highs of 19–22°C.
Met Office 1991–2020 averages for the town itself.
A year in Ilminster at a glance
Each month’s typical high and low, in °C.
What a year in Ilminster feels like
Typical highs and lows by season and by month, from the Met Office’s 1991–2020 averages.
About 888 mm of rain a year
December is the wettest month and July the driest. About 29 days a year bring 10 mm (0.4 in) or more. 24th wettest of 49 Somerset towns of 2,500+.
Rain by month
Millimetres
Sunshine by month
Hours of bright sunshine at Yeovilton
30 air frosts and 14 days of 25°C a year
On about 30 nights a year the air drops below freezing, and on about under 1 days it stays below freezing all day. About 14 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 Yeovilton
Yeovilton is 13 miles north-east of Ilminster, 20 m (66 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 | 8.6°C | 2.0°C | 70 mm | 10.0 | 58 |
| February | 9.0°C | 1.8°C | 51 mm | 9.7 | 77 |
| March | 11.2°C | 3.0°C | 49 mm | 7.6 | 114 |
| April | 13.9°C | 4.5°C | 52 mm | 3.8 | 163 |
| May | 17.1°C | 7.4°C | 47 mm | 0.5 | 191 |
| June | 19.9°C | 10.3°C | 58 mm | 0.0 | 188 |
| July | 21.9°C | 12.2°C | 50 mm | 0.0 | 192 |
| August | 21.6°C | 12.2°C | 61 mm | 0.0 | 175 |
| September | 19.2°C | 10.0°C | 53 mm | 0.0 | 142 |
| October | 15.3°C | 7.6°C | 81 mm | 1.8 | 104 |
| November | 11.5°C | 4.4°C | 80 mm | 5.5 | 69 |
| December | 9.0°C | 2.3°C | 77 mm | 10.3 | 52 |
| Year | 14.9°C | 6.5°C | 728 mm | 49 | 1,524 |
Met Office historic station data, Yeovilton, 1991–2020 months averaged (a month needs 20 of the 30 years; estimated values counted, missing months left out). Sunshine: Kipp & Zonen recorder.
How Ilminster 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 Somerset 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 |
|---|---|---|---|
| Ilminster | 21.7°C | 2.9°C | 888 mm |
| Horton and Broadway 2.3 mi | 21.6°C about the same | 2.9°C about the same | 904 mm |
| Chard 3.9 mi | 21.4°C about the same | 2.6°C about the same | 1,096 mm |
| South Petherton 5.0 mi | 21.9°C about the same | 2.8°C about the same | 819 mm |
| Merriott 5.5 mi | 21.8°C about the same | 3.0°C about the same | 941 mm |
| Tatworth 5.8 mi | 21.4°C about the same | 2.6°C about the same | 1,093 mm |
| Crewkerne 6.1 mi | 21.6°C about the same | 2.9°C about the same | 982 mm |
Ilminster 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 | 8.6°C 47°F | 2.9°C 37°F | 5.7°C | 99 mm 3.9 in |
| February | 8.8°C 48°F | 2.6°C 37°F | 5.6°C | 68 mm 2.7 in |
| March | 11.0°C 52°F | 3.6°C 39°F | 7.4°C | 63 mm 2.5 in |
| April | 14.1°C 57°F | 4.9°C 41°F | 9.5°C | 60 mm 2.4 in |
| May | 17.3°C 63°F | 7.6°C 46°F | 12.4°C | 57 mm 2.3 in |
| June | 19.9°C 68°F | 10.2°C 50°F | 14.9°C | 65 mm 2.6 in |
| July | 21.7°C 71°F | 12.2°C 54°F | 17.1°C | 49 mm 1.9 in |
| August | 21.5°C 71°F | 12.3°C 54°F | 16.9°C | 64 mm 2.5 in |
| September | 19.3°C 67°F | 10.6°C 51°F | 14.9°C | 62 mm 2.4 in |
| October | 14.9°C 59°F | 8.0°C 46°F | 11.5°C | 99 mm 3.9 in |
| November | 11.4°C 53°F | 5.4°C 42°F | 8.3°C | 100 mm 3.9 in |
| December | 8.9°C 48°F | 3.1°C 38°F | 5.8°C | 102 mm 4.0 in |
| Year | 14.8°C | 6.9°C | 10.8°C | 888 mm |
Where Ilminster’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 Ilminster’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 Yeovilton, 13 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 Ilminster’s climate
How warm does Ilminster get in summer?
July is the warmest month, with average highs of 21.7°C (71°F). About 14 days a year reach 25°C (77°F), more than 67% of UK towns.
How cold does Ilminster get in winter?
February nights average 2.6°C (37°F). The air drops below freezing on about 30 nights a year, and about under 1 days a year stay below freezing all day.
How much rain does Ilminster get?
About 888 mm (35 in) a year, more than 68% of UK towns. December is the wettest month (102 mm) and July the driest (49 mm).
How sunny is it?
The nearest Met Office station with a sunshine record, Yeovilton (13 miles away), averages 1,524 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 Ilminster. 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 Ilminster →
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