Anglesey is flatter, sunnier and often drier than the mountains on the mainland, though it is exposed to wind.
Season by season
Spring (March–May)
Seabirds return to South Stack, wildflowers cover the cliffs and beaches are empty.
Summer (June–August)
The best beach weather and boat trips; the solstice at Bryn Celli Ddu in June.
Autumn (September–November)
Mild, with migrating birds and quiet beaches.
Winter (December–February)
Windy and wild; good for bracing walks. St Dwynwen’s Day on 25 January.
Month by month
| Month | Avg high / low | Wet days | Daylight | Our verdict |
|---|---|---|---|---|
| January | 8° / 3°C | ≈16 | ≈8.5 h | Quiet & cheap |
| February | 8° / 3°C | ≈12 | ≈10 h | Quiet & cheap |
| March | 10° / 4°C | ≈13 | ≈11.8 h | Good |
| April | 12° / 6°C | ≈11 | ≈13.7 h | Good |
| May | 15° / 8°C | ≈11 | ≈15.3 h | Best |
| June | 17° / 11°C | ≈10 | ≈16.2 h | Best |
| July | 19° / 13°C | ≈11 | ≈15.7 h | Peak season |
| August | 19° / 13°C | ≈12 | ≈14.3 h | Peak season |
| September | 17° / 11°C | ≈12 | ≈12.5 h | Best |
| October | 14° / 9°C | ≈15 | ≈10.7 h | Good |
| November | 11° / 6°C | ≈16 | ≈9 h | Quiet & cheap |
| December | 9° / 4°C | ≈16 | ≈8.1 h | Quiet & cheap |
Approximate long-term averages, rounded; daylight is the approximate time between sunrise and sunset mid-month. Wales is mild but wet, and the mountains are colder, windier and wetter than the coast: pack layers in every season.
Festivals & events
- 25 January St Dwynwen’s Day, the Welsh day of lovers.
- June Summer solstice at Bryn Celli Ddu.
- August The Anglesey Show and sailing regattas on the Menai Strait.
Crowds & booking ahead
Newborough car park and Beaumaris are busy on sunny summer weekends. Weekdays and evenings are quieter.
