St Ishmael's sits near the bottom of UK towns for frosts
July afternoons average 19.1°C (66°F). Expect the heaviest rain in November and the lightest in June. Warm afternoons come less often than in 93% of UK towns. Radiators earn their keep from November to April, the months that average under 10°C.
Met Office 1991–2020 averages for the town itself.
A year in St Ishmael's at a glance
Each month’s typical high and low, in °C.
What a year in St Ishmael's feels like
Typical highs and lows by season and by month, from the Met Office’s 1991–2020 averages.
About 1,022 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 Aberporth
9 air frosts and 2 days of 25°C a year
On about 9 nights a year the air drops below freezing; days that stay below freezing are rare. About 2 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 Aberporth
Aberporth is 38 miles north-east of St Ishmael's, 133 m (436 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 | 7.8°C | 3.4°C | 90 mm | 4.5 | 60 |
| February | 7.9°C | 3.3°C | 67 mm | 3.8 | 79 |
| March | 9.4°C | 4.2°C | 58 mm | 1.8 | 127 |
| April | 11.6°C | 5.7°C | 54 mm | 0.4 | 172 |
| May | 14.3°C | 8.2°C | 55 mm | 0.0 | 210 |
| June | 16.6°C | 10.7°C | 64 mm | 0.0 | 203 |
| July | 18.3°C | 12.5°C | 67 mm | 0.0 | 187 |
| August | 18.3°C | 12.7°C | 75 mm | 0.0 | 169 |
| September | 16.7°C | 11.2°C | 71 mm | 0.0 | 141 |
| October | 13.6°C | 8.9°C | 107 mm | 0.0 | 99 |
| November | 10.5°C | 6.2°C | 117 mm | 0.6 | 59 |
| December | 8.5°C | 4.1°C | 107 mm | 3.5 | 49 |
| Year | 12.8°C | 7.6°C | 931 mm | 15 | 1,554 |
Met Office historic station data, Aberporth, 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 Ishmael's 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 Dyfed 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 Ishmael's | 19.1°C | 4.2°C | 1,022 mm |
| Milford Haven 4.4 mi | 19.2°C about the same | 4.2°C about the same | 1,101 mm |
| Johnston 6.6 mi | 19.2°C about the same | 2.8°C 1.4°C colder | 1,184 mm |
| Neyland 8.0 mi | 19.9°C 0.8°C warmer | 2.8°C 1.4°C colder | 1,194 mm |
| Merlin's Bridge 8.4 mi | 19.5°C about the same | 2.7°C 1.5°C colder | 1,273 mm |
| Pembroke Dock 8.7 mi | 19.6°C 0.6°C warmer | 3.6°C 0.6°C colder | 1,193 mm |
| Haverfordwest 8.8 mi | 19.5°C about the same | 3.0°C 1.2°C colder | 1,264 mm |
St Ishmael's 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 | 8.7°C 48°F | 4.2°C 40°F | 6.6°C | 104 mm 4.1 in |
| February | 9.0°C 48°F | 4.2°C 40°F | 6.6°C | 82 mm 3.2 in |
| March | 10.2°C 50°F | 4.8°C 41°F | 7.5°C | 73 mm 2.9 in |
| April | 12.6°C 55°F | 6.2°C 43°F | 9.4°C | 67 mm 2.6 in |
| May | 15.1°C 59°F | 8.5°C 47°F | 11.8°C | 66 mm 2.6 in |
| June | 17.4°C 63°F | 11.0°C 52°F | 14.1°C | 62 mm 2.4 in |
| July | 19.1°C 66°F | 13.0°C 55°F | 15.9°C | 65 mm 2.6 in |
| August | 19.2°C 66°F | 13.2°C 56°F | 16.2°C | 92 mm 3.6 in |
| September | 17.8°C 64°F | 11.9°C 53°F | 14.8°C | 73 mm 2.9 in |
| October | 14.8°C 59°F | 9.8°C 50°F | 12.3°C | 116 mm 4.5 in |
| November | 11.9°C 53°F | 7.4°C 45°F | 9.6°C | 123 mm 4.8 in |
| December | 9.9°C 50°F | 5.3°C 42°F | 7.6°C | 100 mm 3.9 in |
| Year | 13.8°C | 8.3°C | 11.0°C | 1,022 mm |
Where St Ishmael's’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 Ishmael's’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 Aberporth, 38 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 Ishmael's’s climate
How warm does St Ishmael's get in summer?
August is the warmest month, with average highs of 19.2°C (66°F). About 2 days a year reach 25°C (77°F), fewer than 93% of UK towns.
How cold does St Ishmael's get in winter?
January nights average 4.2°C (40°F). The air drops below freezing on about 9 nights a year, and about under 1 days a year stay below freezing all day.
How much rain does St Ishmael's get?
About 1,022 mm (40 in) a year, more than 79% of UK towns. November is the wettest month (123 mm) and June the driest (62 mm).
How sunny is it?
The nearest Met Office station with a sunshine record, Aberporth (38 miles away), averages 1,554 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 Ishmael's. 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 Ishmael's →
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