Region in Wales, United Kingdom
Snowdonia weather by month and the best time to visit
When to go to Snowdonia
May–June and September are driest and calmer. July–August is busiest, with Snowdon queues and full car parks. Winter brings snow, ice and winter-mountain conditions.
Snowdonia weather by month
Average daily high, rainfall and conditions.
- Jan7°126 mm
- Feb7°104 mm
- Mar9°95 mm
- Apr12°77 mm
- May15°87 mm
- Jun18°99 mm
- Jul19°113 mm
- Aug19°119 mm
- Sep17°108 mm
- Oct14°135 mm
- Nov10°142 mm
- Dec8°148 mm
Monthly averages
| Month | High | Low | Rain | Humidity | Conditions |
|---|---|---|---|---|---|
| January | 7°C45°F | 4°C38°F | 126 mm | 94% | Cold |
| February | 7°C45°F | 3°C38°F | 104 mm | 93% | Cold |
| March | 9°C48°F | 4°C38°F | 95 mm | 90% | Cold |
| April | 12°C54°F | 5°C42°F | 77 mm | 86% | Cool |
| May | 15°C59°F | 8°C47°F | 87 mm | 84% | Cool |
| June | 18°C64°F | 11°C52°F | 99 mm | 84% | Cool |
| July | 19°C67°F | 13°C55°F | 113 mm | 85% | Pleasant |
| August | 19°C66°F | 13°C55°F | 119 mm | 87% | Pleasant |
| September | 17°C62°F | 11°C52°F | 108 mm | 88% | Cool |
| October | 14°C56°F | 9°C48°F | 135 mm | 91% | Cool |
| November | 10°C50°F | 6°C44°F | 142 mm | 93% | Cold |
| December | 8°C46°F | 4°C40°F | 148 mm | 94% | Cold |
Best months across United Kingdom
| Place | Best months | Warmest month |
|---|---|---|
| London | May–Jul, Sep | Jul (23°C) |
| Edinburgh | May–Jun, Aug–Sep | Jul (18°C) |
| Manchester | May–Jul, Sep | Jul (20°C) |
| Liverpool | May–Jul, Sep | Jul (19°C) |
| Oxford | May–Jun, Sep | Jul (22°C) |
| Bath | May–Jun, Sep | Jul (21°C) |
| Cambridge | May–Jun, Sep | Jul (23°C) |
| Glasgow | May–Jul, Sep | Jul (18°C) |
| Brighton | May–Jul, Sep | Jul (21°C) |
| Scottish Highlands | May–Jun, Sep | Jul (18°C) |
| Isle of Skye | May–Jun, Sep | Jul (15°C) |
| York | May–Jun, Sep–Oct | Jul (21°C) |
| Bristol | May–Jul, Sep | Jul (22°C) |
| Lake District | May–Jun, Sep–Oct | Jul (18°C) |
| Cornwall | May–Jun, Sep | Jul (18°C) |
| Cotswolds | May–Jun, Sep–Oct | Jul (22°C) |
| Belfast | May–Jul, Sep | Jul (17°C) |
| Cardiff | May–Jul, Sep | Jul (20°C) |
| Birmingham | May–Jul, Sep | Jul (21°C) |
| Newcastle | May–Jul, Sep | Jul (19°C) |
| Leeds | May–Jul, Sep | Jul (21°C) |
| Snowdonia | May–Jul, Sep | Jul (19°C) |
Quick answers
What is the best month to visit Snowdonia?
May–Jul, Sep. May–June and September are driest and calmer. July–August is busiest, with Snowdon queues and full car parks. Winter brings snow, ice and winter-mountain conditions.
When is the rainy season in Snowdonia?
Rain peaks in December with about 148 mm. No month averages 150 mm or more.
What is the hottest month in Snowdonia?
July, with average highs of 19°C (67°F).
How cold does Snowdonia get?
The coolest nights are in February, averaging 3°C (38°F).
More about Snowdonia
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Sources
- NASA POWER climatology (2001–2020)
- Eryri National Park Authority
- Transport for Wales
- Snowdon Mountain Railway
- Betsi Cadwaladr University Health Board
Climate averages are modelled from NASA POWER (MERRA-2) for 2001–2020 at about 50 km resolution, so coasts and valleys can differ a little. Temperatures are adjusted by 1.4°C for the city's elevation. Compiled and reviewed by SoloSquare. How we compile and score this. Spotted something out of date? Tell us.