Comfortable for swimming. Now in the Celtic Sea +20°. Swimming season — from May to October.
Water temperature map of the Celtic Sea
ColderWarmer
Water temperature in the Celtic Sea by city today 📍
+17°
Dublin
+23°
Santander
+18°
Blekpul
+23°
Bilbao
+15°
Kork
+17°
Dublin
+16°
Penzans
+19°
La-Korunya
+23°
San-Sebastyan
+18°
Plymouth
+21°
Saint-Brieuc
+19°
Tonkedek
| City | Now | Swimming |
|---|---|---|
| Dublin | +17° | Cool for swimming |
| Santander | +23° | Comfortable for swimming |
| Blekpul | +18° | Comfortable for swimming |
| Bilbao | +23° | Comfortable for swimming |
| Kork | +15° | Cool for swimming |
| Dublin | +17° | Cool for swimming |
| Penzans | +16° | Cool for swimming |
| La-Korunya | +19° | Comfortable for swimming |
| San-Sebastyan | +23° | Comfortable for swimming |
| Plymouth | +18° | Cool for swimming |
| Saint-Brieuc | +21° | Comfortable for swimming |
| Tonkedek | +19° | Comfortable for swimming |
| Direnon | +21° | Comfortable for swimming |
| Larmor-Plyazh | +20° | Comfortable for swimming |
| Notr-Dam-de-Mon | +22° | Comfortable for swimming |
| Andiyi | +24° | Warm water |
| Mevadzhissi | +17° | Cool for swimming |
| Pil | +16° | Cool for swimming |
| A Coruna | +19° | Comfortable for swimming |
| Sada | +20° | Comfortable for swimming |
| Dinar | +21° | Comfortable for swimming |
| Gijon | +22° | Comfortable for swimming |
| Arteykho | +19° | Comfortable for swimming |
| Foksrok | +16° | Cool for swimming |
| Blackpool | +18° | Comfortable for swimming |
| Anglet | +23° | Warm water |
| Kambre | +19° | Comfortable for swimming |
| Nyukvey | +18° | Comfortable for swimming |
| Ormskirk | +18° | Comfortable for swimming |
| Arklou | +17° | Cool for swimming |
| Bilbao | +23° | Comfortable for swimming |
| Pontipridd | +19° | Comfortable for swimming |
| San Sebastian | +23° | Comfortable for swimming |
| Challans | +22° | Comfortable for swimming |
| Culleredo | +19° | Comfortable for swimming |
| Ayvibridzh | +17° | Cool for swimming |
| Finglas | +17° | Cool for swimming |
| Torquay | +18° | Comfortable for swimming |
| Penzance | +16° | Cool for swimming |
| Balbriggan | +16° | Cool for swimming |
🎣 Fishing in cities on the Celtic Sea
Water temperature forecast in the Celtic Sea 📅
Tuesday
8 September
+25°
Wednesday
9 September
+25°
Thursday
10 September
+25°
Friday
11 September
+25°
Saturday
12 September
+24°
Sunday
13 September
+24°
Monday
14 September
+23°
Computed by a climate model. Water changes slowly — no sharp shifts.
Water temperature in the Celtic Sea this weekend
Saturday, 12 September · water +24° · warm water
Sunday, 13 September · water +24° · warm water
Water temperature in the Celtic Sea for a month
There is no exact monthly water forecast — it changes slowly. The reference is the climate normal: up to +26° in summer. The monthly normal is below.
Monthly water temperature in the Celtic Sea 🗓️
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| +5 | +7 | +10 | +13 | +19 | +26 | +26 | +24 | +22 | +19 | +12 | +7 |
Climate normal (model estimate).
Swimming conditions in the Celtic Sea by month
Jan+5°Cold, only for the hardy.
Feb+7°Cold, only for the hardy.
Mar+10°Cold, only for the hardy.
Apr+13°Cold, only for the hardy.
May+19°Swimming season — comfortable.
Jun+26°Swimming season — comfortable.
Jul+26°Swimming season — comfortable.
Aug+24°Swimming season — comfortable.
Sep+22°Swimming season — comfortable.
Oct+19°Swimming season — comfortable.
Nov+12°Cold, only for the hardy.
Dec+7°Cold, only for the hardy.
When to swim in the Celtic Sea 🏖️
🏖️
Comfortable to swim in from May to October, when the water warms to +17° and above.
Cities on the Celtic Sea 📍
DublinSantanderBlekpulBilbaoKorkDublinPenzansLa-KorunyaSan-SebastyanPlymouthSaint-BrieucTonkedekDirenonLarmor-PlyazhNotr-Dam-de-MonAndiyiMevadzhissiPilA CorunaSadaDinarGijonArteykhoFoksrokBlackpoolAngletKambreNyukveyOrmskirkArklouBilbaoPontipriddSan SebastianChallansCulleredoAyvibridzhFinglasTorquayPenzanceBalbriggan
FAQ about water in the Celtic Sea ❓
What is the water temperature in the Celtic Sea now?
Now +20° — Comfortable for swimming.
Can you swim in the Celtic Sea?
Comfortable season — from May to October.
When is water warmest in the Celtic Sea?
Warmest in July — up to +26°.
Where does the water temperature data come from?
A water temperature model (by latitude, longitude and day of year) and SST measurements, by cities.
Water temperature archive in the Celtic Sea on this day
| City | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
|---|---|---|---|---|---|---|---|---|---|---|
| Dublin | +19° | +21° | +23° | +24° | +22° | +20° | +19° | +20° | +23° | +24° |
| Santander | +22° | +24° | +26° | +26° | +25° | +23° | +22° | +23° | +25° | +27° |
| Blekpul | +16° | +18° | +21° | +21° | +20° | +17° | +16° | +18° | +20° | +22° |
| Bilbao | +23° | +24° | +27° | +27° | +26° | +23° | +22° | +24° | +26° | +28° |
| Kork | +20° | +22° | +25° | +25° | +24° | +21° | +20° | +22° | +24° | +25° |
Climate normal (model estimate for this date), not a measurement archive.
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Water temperature in the Celtic Sea — in detail
Water temperature in the Celtic Sea is tracked across 1245 cities. The water is now about +20°. The page has a temperature map by city, a daily forecast and a monthly climate normal.