Castlerock
Co. Derry/Londonderry · faces N · exposed ·
Offshore wind: smooth water near the shore, small waves.
Scores are estimates from forecasts, not a safety rating. Before you go in
Tides (model): Low 02:00 · High 09:00 · Low 15:00 · High 21:00
Sunrise 07:57 · Sunset 16:24 · UV 0 (low)
Water quality
DAERA rates each bathing season after it ends, using the last four years of samples: the 2027 rating is usually published in autumn 2027.
DAERA advises avoiding bathing during and for up to 48 hours after heavy rainfall. Weekly test results (June to mid-September) are on the DAERA dashboard.
Source: DAERA bathing water data (Castlerock), Open Government Licence v3.0. Water is tested from June to mid-September. DAERA bathing water dashboard
Hour by hour · Overall · Today
| Time | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Score | dark | 3.7 | 3.7 | 3.9 | 4.2 | 4.4 | 4.8 | 5.0 | 4.9 | 4.7 | 4.4 | dark | dark | dark | dark | dark |
| Wind mph | 11 | 12 | 11 | 14 | 16 | 15 | 18 | 16 | 13 | 16 | 16 | 14 | 17 | 13 | 13 | 13 |
| Direction | S | S | S | S | S | S | SW | S | S | S | S | S | S | S | S | S |
| Waves at beach m | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.4 | 0.4 | 0.3 | 0.3 |
| Swell offshore m · s | 0.8 6s | 0.8 6s | 0.8 6s | 0.8 6s | 0.8 6s | 0.9 7s | 0.9 7s | 0.9 7s | 0.9 7s | 0.9 7s | 0.9 7s | 0.9 7s | 0.9 7s | 0.9 7s | 0.9 7s | 0.9 6s |
| Tide | ||||||||||||||||
| Water °C | 10.3 | 10.3 | 10.3 | 10.3 | 10.3 | 10.3 | 10.3 | 10.3 | 10.4 | 10.4 | 10.4 | 10.4 | 10.4 | 10.4 | 10.4 | 10.5 |
| Air °C | 7 | 7 | 6 | 8 | 9 | 9 | 10 | 11 | 11 | 10 | 10 | 10 | 10 | 9 | 9 | 9 |
| Rain chance % | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 4 | 10 | 23 | 40 | 55 | 67 | 76 | 80 |
| Rain mm | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0.1 | 0.4 | 0.4 | 1.0 |
| Cloud % | 98 | 100 | 45 | 100 | 76 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 |
Highlighted columns: the best 3-hour window; grey columns are before sunrise or after sunset. Tides come from a global model and can be off by up to an hour: check local tide tables before swimming.