Traeth Harlech Sea Water Temperature
A temperate beach on the Irish Sea, warmest around August at about 17.2°C. Today's reading, 7-day forecast, and monthly averages below.
Traeth Harlech water temperature
Invigorating and crisp. Tolerable for active swimming, but chilly for prolonged casual bathing.
7-Day Water Temperature Forecast
Traeth Harlech Monthly Water Temperature Averages
Historical monthly climatology. The warmest water in Traeth Harlech occurs inJune, July, August, September — peaking at17.2°C (63°F) in August.
Year-Round Water Temperature Curve (°C / °F)
Hover a bar for detailsFull 12-month data table — min / avg / max & swimming comfort
| Month | Min Water Temp | Average Water Temp | Max Water Temp | Swimming Comfort |
|---|---|---|---|---|
| January | 6.8°C | 8°C | 10.1°C | Very Cold (< 16°C) |
| February | 5.7°C | 7.4°C | 8.9°C | Very Cold (< 16°C) |
| March | 5.8°C | 7.5°C | 10°C | Very Cold (< 16°C) |
| April | 8°C | 9.6°C | 11.2°C | Very Cold (< 16°C) |
| May | 9.9°C | 12°C | 13.7°C | Very Cold (< 16°C) |
| June | 12.6°C | 14.8°C | 16.8°C | Very Cold (< 16°C) |
| July | 13.6°C | 16.5°C | 18.8°C | Cool / Refreshing (16°C – 20°C) |
| August | 16.4°C | 17.2°C | 18.7°C | Cool / Refreshing (16°C – 20°C) |
| SeptemberCurrent | 14.5°C | 16.4°C | 18.9°C | Cool / Refreshing (16°C – 20°C) |
| October | 12.5°C | 14.3°C | 16.2°C | Very Cold (< 16°C) |
| November | 9.2°C | 11.4°C | 13.5°C | Very Cold (< 16°C) |
| December | 8.7°C | 9.6°C | 10.7°C | Very Cold (< 16°C) |
Swimming FAQs for Traeth Harlech
Is the sea warm enough to swim in Traeth Harlech today?
Typical sea surface temperature in Traeth Harlech this time of year is 16.4°C (61.5°F) — classified as Cool / Refreshing (16°C – 20°C). Invigorating and crisp. Tolerable for active swimming, but chilly for prolonged casual bathing. Live readings load automatically.
What are the warmest months for swimming in Traeth Harlech?
The highest water temperatures in Traeth Harlech typically occur duringJune, July, August, September, when monthly averages reach peak seasonal levels.
What is the typical water temperature in Traeth Harlech in September?
Historically in September, water temperatures in Traeth Harlech average around16.4°C (61.5°F), fluctuating between a recorded minimum of 14.5°C and a maximum of 18.9°C.