Mountain Weather

Best time to visit Eryri (Snowdonia) for mountain weather.

Typical high-ground conditions for every week and month, drawn from 40 years of weather history.

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, 24% were excellent or good and 21% were poor or severe.

Check the live Eryri (Snowdonia) forecast →
Historically excellent or good24%280 comparable days
Excellent4%Good20%Average55%Poor20%Severe1%
Historically dry48% of daysTypical daily max gust28 mphStronger days around 39 mphTypical high ground7.0°C24-hour mean near 1,085 mExtensive cloud46% of days

September context: 23% of days across the month were excellent or good; 18% were poor or severe. Read the full September guide.

Planning a different time of year?Compare Eryri (Snowdonia) month by month
January to December

Eryri (Snowdonia) mountain weather by month.

Each month has its own detailed climate guide, with the historical balance of excellent, good, average, poor and severe days on representative high ground.

January16% good
50% average · 34% poor or severe
February17% good
52% average · 31% poor or severe
March21% good
55% average · 24% poor or severe
April29% good
56% average · 15% poor or severe
May31% good
53% average · 16% poor or severe
June29% good
58% average · 13% poor or severe
July27% good
60% average · 13% poor or severe
August26% good
59% average · 15% poor or severe
September23% good
59% average · 18% poor or severe
October16% good
58% average · 26% poor or severe
November17% good
54% average · 29% poor or severe
December16% good
50% average · 34% poor or severe
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 excellent or good days. They are useful for broad trip timing, but the live forecast should decide the final plan.

  1. 01
    Week around 17 April35% excellent or good · 14% poor or severe
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  2. 02
    Week around 29 May34% excellent or good · 12% poor or severe
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  3. 03
    Week around 1 May34% excellent or good · 14% poor or severe
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  4. 04
    Week around 5 June34% excellent or good · 15% poor or severe
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  5. 05
    Week around 12 June31% excellent or good · 13% poor or severe
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  6. 06
    Week around 17 July31% excellent or good · 13% poor or severe
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20 mountain areas

Compare another part of the UK.

Each page includes weekly and monthly high-ground climate summaries, a highlighted Saturday planner and nearby accommodation.

Angus GlensScotland · strongest historical month: May23% good Argyll and Loch LomondScotland · strongest historical month: May28% good Bannau Brycheiniog (Brecon Beacons)Wales · strongest historical month: June31% good CairngormsScotland · strongest historical month: May22% good Clwydian Range and BerwynsWales · strongest historical month: April28% good DartmoorEngland · strongest historical month: July37% good Eryri (Snowdonia)Wales · strongest historical month: May31% good Lake DistrictEngland · strongest historical month: May35% good Lewis and HarrisScotland · strongest historical month: May29% good LochaberScotland · strongest historical month: May25% good Mid Wales and Cambrian MountainsWales · strongest historical month: May32% good Monadhliath and Creag MeagaidhScotland · strongest historical month: May22% good North PenninesEngland · strongest historical month: May28% good Northumberland and CheviotsEngland · strongest historical month: May32% good Northwest HighlandsScotland · strongest historical month: May27% good Peak DistrictEngland · strongest historical month: July30% good Perthshire HighlandsScotland · strongest historical month: May25% good SkyeScotland · strongest historical month: May38% good Southern ScotlandScotland · strongest historical month: May34% good Yorkshire DalesEngland · strongest historical month: May32% good