Shell Bay Water Temperature & Swim Forecast
Dorset family beach.
Fresh water with a light chop and a light breeze — fresh conditions — a wetsuit is recommended.
Model estimate · modelled, not a buoy measurement. How accurate is this?
Location
Shell Bay on the map, with nearby beaches and live sea temperatures.
7-day forecast
Water, air, waves, wind and UV outlook for the week ahead.
3/2mm fullsuit
At 16.4°C a 3/2mm fullsuit is the standard wetsuit for surfing and watersports.
Recommendation tuned for Shell Bay's current water temperature. Individual tolerance, wind chill, and session length all matter — when in doubt, size up.
Shell Bay swimming conditions summary
- Water temperature
- 16.4°C
- Water feels
- Refreshing
- Swimmable today
- Yes, but fresh — short swims or a wetsuit
- Swim conditions score
- 59/100 · Fair
- Wetsuit needed
- 3/2mm fullsuit
- Air temperature
- —
- Waves
- —
- Wind
- —
- UV index
- —
- Average sea temperature (September)
- 16.0 °C
- Warmest months to swim
- July, August, September
At 16.4°C a 3/2mm fullsuit is the standard wetsuit for surfing and watersports. Model estimate. Water, wave, wind and UV values are Open-Meteo marine/weather model estimates, refreshed hourly — not buoy measurements.
Frequently asked questions
Can I swim at Shell Bay right now?
The sea at Shell Bay is currently 16.4°C — fresh swimming conditions. Most swimmers will find the water comfortable when it's above 22°C; below 18°C feels fresh and a wetsuit is recommended.
What will the sea temperature be at Shell Bay next week?
Based on long-term September averages and the latest marine model, expect the sea around Shell Bay to sit close to 14.6°C over the next 7 days. Check the live 7-day chart above for the exact daily outlook.
When is the best month to swim at Shell Bay?
July – August – September are typically the warmest months to swim at Shell Bay, with sea temperatures at their seasonal peak.
Do I need a wetsuit at Shell Bay?
With water currently at 16.4°C: above 22°C no wetsuit needed; 18–22°C a shorty is comfortable for long swims; 14–18°C a 3/2mm full suit; below 14°C a 4/3mm or thicker.
Can I swim at Shell Bay today?
The sea is currently 16.4°C — fair swimming conditions. Acclimatised swimmers will be most comfortable.
- • Located in Dorset, United Kingdom (English Channel).
- • Family friendly with calm, accessible water.
- • Live data refreshed hourly from Open-Meteo Marine.
Monthly sea temperature averages
Tap any month to see what to expect — based on regional climatology.
Best time to swim in Shell Bay
The sea in Shell Bay peaks in August, when the water averages around 17°C.
On average, 0 months a year sit above 20°C — the threshold most swimmers describe as pleasant without a wetsuit.
Outside peak season the water drops toward 9°C, so a 3/2mm shorty or full wetsuit makes long swims much more comfortable.
The coldest month is typically February at around 8°C, when cold-water swimmers dominate the coast.
Shell Bay sea temperature history
Long-term climatology for Shell Bay shows an annual mean sea temperature of 12°C, ranging from 8°C in winter to 17°C at the summer peak.
The seasonal swing is roughly 9°C between the coldest and warmest month — a useful yardstick when comparing years or checking whether the current sea is running above or below average.
Recent decades have trended slightly warmer at Shell Bay, in line with regional sea-surface temperature records for the wider basin.
Monthly averages below are drawn from multi-decadal climatology and are updated as new observations arrive.
Shell Bay sea temperature: frequently asked questions
What is the warmest month to swim in Shell Bay?
August is the warmest month in Shell Bay, when the sea averages about 17°C. Late-season warmth often persists a few weeks after peak.
When is the sea coldest in Shell Bay?
The coldest month in Shell Bay is typically February, when the water averages around 8°C. Cold-water swimmers and surfers dominate this period.
When can you swim in Shell Bay without a wetsuit?
The sea in Shell Bay rarely climbs above 20°C, so a wetsuit is recommended year-round for anything longer than a quick dip.
Do I need a wetsuit in Shell Bay?
Outside peak summer the water in Shell Bay drops toward 9°C, so a 3/2mm shorty or full wetsuit makes long swims much more comfortable. In peak months most swimmers go without.
What is the average sea temperature in Shell Bay?
The long-term annual mean sea temperature in Shell Bay is about 12°C, based on multi-decadal climatology of the surrounding waters.
How do I check the current sea temperature in Shell Bay?
The live reading at the top of this page shows the current sea temperature in Shell Bay, updated hourly from marine buoy and satellite data. The 7-day forecast covers water, air, waves, wind and UV for the week ahead.
Year-round sea temperature
| Month | Sea | Comfort |
|---|---|---|
| Jan | 9°C | Cold |
| Feb | 8°C | Cold |
| Mar | 8°C | Cold |
| Apr | 9°C | Cold |
| May | 11°C | Cold |
| Jun | 14°C | Bracing |
| Jul | 16°C | Bracing |
| Aug ⭐ | 17°C | Bracing |
| Sep | 16°C | Bracing |
| Oct | 14°C | Bracing |
| Nov | 12°C | Cold |
| Dec | 10°C | Cold |
Nearby beaches
The closest coastline, with live water temperatures.