Few UK towns get more rain than Machynlleth: 2,132 mm (84 in) a year
Midwinter brings lows of about 2.5°C (36°F). Winter and summer sit 18°C apart. In July, afternoons here are cooler than in 89% of UK towns. Windscreens need scraping on about 47 mornings a year, the nights the air drops below 0°C.
Met Office 1991–2020 averages for the town itself.
A year in Machynlleth at a glance
Each month’s typical high and low, in °C.
What a year in Machynlleth feels like
Typical highs and lows by season and by month, from the Met Office’s 1991–2020 averages.
About 2,132 mm of rain a year
December is the wettest month and May the driest. About 61 days a year bring 10 mm (0.4 in) or more.
Rain by month
Millimetres
Sunshine by month
Hours of bright sunshine at Aberporth
47 air frosts and 10 days of 25°C a year
On about 47 nights a year the air drops below freezing, and on about under 1 days it stays below freezing all day. About 10 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 44 miles south-west of Machynlleth, 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 Machynlleth 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 Powys 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.
Machynlleth 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 | 7.6°C 46°F | 2.5°C 36°F | 5.0°C | 197 mm 7.8 in |
| February | 7.0°C 45°F | 1.3°C 34°F | 4.1°C | 181 mm 7.1 in |
| March | 9.1°C 48°F | 2.3°C 36°F | 5.6°C | 152 mm 6.0 in |
| April | 12.0°C 54°F | 3.9°C 39°F | 7.8°C | 127 mm 5.0 in |
| May | 15.3°C 60°F | 6.6°C 44°F | 10.8°C | 117 mm 4.6 in |
| June | 17.7°C 64°F | 9.2°C 48°F | 13.2°C | 142 mm 5.6 in |
| July | 19.2°C 67°F | 11.1°C 52°F | 15.0°C | 153 mm 6.0 in |
| August | 18.6°C 66°F | 10.9°C 52°F | 14.7°C | 171 mm 6.7 in |
| September | 16.4°C 61°F | 8.9°C 48°F | 12.5°C | 178 mm 7.0 in |
| October | 12.8°C 55°F | 6.6°C 44°F | 9.6°C | 228 mm 9.0 in |
| November | 9.4°C 49°F | 3.8°C 39°F | 6.5°C | 215 mm 8.5 in |
| December | 7.0°C 45°F | 1.7°C 35°F | 4.3°C | 272 mm 10.7 in |
| Year | 12.7°C | 5.7°C | 9.1°C | 2,132 mm |
Where Machynlleth’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 Machynlleth’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, 44 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 Machynlleth’s climate
How warm does Machynlleth get in summer?
July is the warmest month, with average highs of 19.2°C (67°F). About 10 days a year reach 25°C (77°F), fewer than 53% of UK towns.
How cold does Machynlleth get in winter?
February nights average 1.3°C (34°F). The air drops below freezing on about 47 nights a year, and about under 1 days a year stay below freezing all day.
How much rain does Machynlleth get?
About 2,132 mm (84 in) a year, more than almost every UK town. December is the wettest month (272 mm) and May the driest (117 mm).
How sunny is it?
The nearest Met Office station with a sunshine record, Aberporth (44 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 Machynlleth. 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 Machynlleth →
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