September stays on Eryri (Snowdonia)
Plas Isaf
Beddgelert · Sleeps 9
Indicative catalogue price £807 for 7 nightsExact September prices and availability are checked after you choose a week.What is Eryri (Snowdonia) mountain weather like in September?
Typical mountain and low-level wind, temperature, rainfall and sunshine for September.
40-year mountain climate
Typical high-ground conditions in September.
Historically, September has been one of the more promising parts of the year for high-ground days. Of 1,200 representative high-ground days, 47% were settled for rain and wind, 41% were mixed, and 12% were poor or severe for rain and wind.
Dry days accounted for 51% of the sample. Across the whole year, the settled-day share is 43%, with around 195 wet days, so a region's strongest month should not be mistaken for its usual climate. As a separate check, the Met Office 1991–2020 average at Aber No 2 is 134 hours of bright sunshine during September. Cloud and views are deliberately kept out of the settled-day score because they vary sharply between individual summits; check the live forecast nearer the trip. These figures describe representative high ground around 1,085 metres, so coastal and low-level conditions can be milder.
Settled rain and wind47%Historically dry51%High-ground temperature7.2°CTypical maximum gust27 mphStronger days around 37 mphMet Office sunshine context134 hrsAverage bright sunshine in September, 1991–2020 · Aber No 2
Plan beyond the forecast
Choose an area and week.
Saturday dates are highlighted because they usually unlock the widest choice of seven-night cottage stays. Other arrival days still work.
Typical conditions, not a forecastThis describes representative high ground. A difficult hill day can still be suitable for a lower-level plan.
Week 37 · 12 September
What this week is typically like on Eryri (Snowdonia) high ground.
Across 280 comparable historical hill days, 43% were settled for rain and wind and 14% were poor or severe for rain and wind.
Check the live Eryri (Snowdonia) forecast →Settled rain and wind43%280 comparable days
Dry and light wind23%Dry, manageable wind20%Mixed43%Poor13%Severe1%
Historically dry48% of daysTypical daily max gust28 mphStronger days around 39 mphTypical high ground7.0°C24-hour mean near 1,085 mPoor or severe rain/wind14% of daysViews are checked separately in the live forecast
September context: 47% of days across the month were settled for rain and wind; 12% were poor or severe for rain and wind. Read the full September guide.
Valley and low level for this week
Around Betws-y-Coed.
Representative base · 35 mTypical daily high16.8°CWarmer days 19.0°CHistorically dry53%51% dry with lighter windMaximum wind11 mphStronger days 17 mphTypical overnight low11.0°CCooler nights 8.9°C
Planning a different time of year?Compare Eryri (Snowdonia) month by month
Valleys and trip bases
Low-level weather around Betws-y-Coed in September.
Betws-y-Coed, at roughly 35 metres, provides a practical low-level reference for Eryri (Snowdonia). Across 1,200 historical days, the typical daytime high was 16.8°C, with warmer days around 19.0°C.
About 56% of days were dry and 55% combined dry weather with lighter winds. Conditions vary across glens, coasts and villages, so this should be used as regional trip-planning guidance rather than a forecast for every location.
Typical daily high16.8°CWarmer days around 19.0°CTypical overnight low11.0°CCooler nights around 8.7°CHistorically dry56%9% had 10 mm+ rainTypical maximum wind11 mphStronger days around 15 mph
January to December
Eryri (Snowdonia) weather by month.
Each month has a detailed guide comparing high-ground hill days with typical conditions at a representative valley or low-level trip base.
January39% settled rain/wind
High ground: 31% mixed · 30% poor or severe for rain/windBetws-y-Coed: 49% dry · 7.9°C daily high
February39% settled rain/wind
High ground: 34% mixed · 27% poor or severe for rain/windBetws-y-Coed: 50% dry · 8.3°C daily high
March42% settled rain/wind
High ground: 40% mixed · 18% poor or severe for rain/windBetws-y-Coed: 50% dry · 9.9°C daily high
April46% settled rain/wind
High ground: 45% mixed · 9% poor or severe for rain/windBetws-y-Coed: 52% dry · 12.1°C daily high
May48% settled rain/wind
High ground: 42% mixed · 10% poor or severe for rain/windBetws-y-Coed: 52% dry · 14.9°C daily high
June48% settled rain/wind
High ground: 45% mixed · 7% poor or severe for rain/windBetws-y-Coed: 53% dry · 17.3°C daily high
July48% settled rain/wind
High ground: 46% mixed · 6% poor or severe for rain/windBetws-y-Coed: 52% dry · 18.6°C daily high
August45% settled rain/wind
High ground: 46% mixed · 9% poor or severe for rain/windBetws-y-Coed: 50% dry · 18.6°C daily high
September47% settled rain/wind
High ground: 41% mixed · 12% poor or severe for rain/windBetws-y-Coed: 56% dry · 16.8°C daily high
October38% settled rain/wind
High ground: 42% mixed · 20% poor or severe for rain/windBetws-y-Coed: 49% dry · 13.9°C daily high
November40% settled rain/wind
High ground: 37% mixed · 23% poor or severe for rain/windBetws-y-Coed: 46% dry · 10.5°C daily high
December39% settled rain/wind
High ground: 31% mixed · 30% poor or severe for rain/windBetws-y-Coed: 48% dry · 8.6°C daily high
Strongest historical signals
Best weeks of the year for Eryri (Snowdonia) mountain weather.
These are the six week bands with the largest historical share of settled rain-and-wind days. Views are not included; use the live forecast nearer the trip.
- 01Week around 12 June53% settled rain/wind · 6% poor or severePlan this week →
- 02Week around 19 June53% settled rain/wind · 6% poor or severePlan this week →
- 03Week around 1 May53% settled rain/wind · 10% poor or severePlan this week →
- 04Week around 17 July51% settled rain/wind · 6% poor or severePlan this week →
- 05Week around 28 August51% settled rain/wind · 9% poor or severePlan this week →
- 06Week around 4 September51% settled rain/wind · 9% poor or severePlan this week →
20 mountain areas
Compare another part of the UK.
The comparison uses the whole year, rather than putting each region's single best month beside another's typical conditions.
Angus GlensScotland · about 184 wet days · 1,047 mm rain · 1,411 sunshine hrs41% settled annually Argyll and Loch LomondScotland · about 213 wet days · 1,933 mm rain · 1,179 sunshine hrs39% settled annually Bannau Brycheiniog (Brecon Beacons)Wales · about 170 wet days · 1,161 mm rain · 1,422 sunshine hrs50% settled annually CairngormsScotland · about 197 wet days · 1,135 mm rain · 1,209 sunshine hrs42% settled annually Clwydian Range and BerwynsWales · about 175 wet days · 1,054 mm rain · 1,573 sunshine hrs48% settled annually DartmoorEngland · about 154 wet days · 942 mm rain · 1,494 sunshine hrs54% settled annually Eryri (Snowdonia)Wales · about 195 wet days · 1,355 mm rain · 1,458 sunshine hrs43% settled annually Lake DistrictEngland · about 194 wet days · 1,447 mm rain · 1,225 sunshine hrs43% settled annually Lewis and HarrisScotland · about 206 wet days · 1,204 mm rain · 1,256 sunshine hrs37% settled annually LochaberScotland · about 218 wet days · 1,931 mm rain · 1,005 sunshine hrs38% settled annually Mid Wales and Cambrian MountainsWales · about 180 wet days · 1,159 mm rain · 1,279 sunshine hrs48% settled annually Monadhliath and Creag MeagaidhScotland · about 202 wet days · 1,307 mm rain · 1,091 sunshine hrs41% settled annually North PenninesEngland · about 178 wet days · 1,037 mm rain · 1,421 sunshine hrs47% settled annually Northumberland and CheviotsEngland · about 152 wet days · 761 mm rain · 1,535 sunshine hrs50% settled annually Northwest HighlandsScotland · about 231 wet days · 1,860 mm rain · 1,044 sunshine hrs33% settled annually Peak DistrictEngland · about 164 wet days · 916 mm rain · 1,383 sunshine hrs49% settled annually Perthshire HighlandsScotland · about 198 wet days · 1,483 mm rain · 1,142 sunshine hrs43% settled annually SkyeScotland · about 230 wet days · 2,031 mm rain · 1,200 sunshine hrs36% settled annually Southern ScotlandScotland · about 203 wet days · 1,368 mm rain · 1,215 sunshine hrs42% settled annually Yorkshire DalesEngland · about 183 wet days · 1,219 mm rain · 1,154 sunshine hrs46% settled annually