Alleynes Bay — Sea temperature now
Snorkel bay with turtles.
Very warm water with a light chop and a light breeze — great swimming conditions.
Location
Alleynes 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.
Monthly sea temperature averages
Typical year-round water temperature, based on regional climatology.
Best time to swim in Alleynes Bay
The sea in Alleynes Bay peaks in June, when the water averages around 28°C.
The main swimming season runs from January – December, when surface temperatures stay comfortable for extended sessions.
On average, 12 months a year sit above 20°C — the threshold most swimmers describe as pleasant without a wetsuit.
The coldest month is typically January at around 26°C, when cold-water swimmers dominate the coast.
Alleynes Bay sea temperature history
Long-term climatology for Alleynes Bay shows an annual mean sea temperature of 27°C, ranging from 26°C in winter to 28°C at the summer peak.
The seasonal swing is roughly 2°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 Alleynes 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.
Alleynes Bay sea temperature: frequently asked questions
What is the warmest month to swim in Alleynes Bay?
June is the warmest month in Alleynes Bay, when the sea averages about 28°C. Late-season warmth often persists a few weeks after peak.
When is the sea coldest in Alleynes Bay?
The coldest month in Alleynes Bay is typically January, when the water averages around 26°C. Cold-water swimmers and surfers dominate this period.
When can you swim in Alleynes Bay without a wetsuit?
The main swimming season in Alleynes Bay runs from January – December — about 12 months a year when the sea sits above 20°C, the level most swimmers describe as pleasant without a wetsuit.
Do I need a wetsuit in Alleynes Bay?
Alleynes Bay stays warm year-round, so most swimmers never need a wetsuit — a rash guard is usually enough for sun and wildlife protection.
What is the average sea temperature in Alleynes Bay?
The long-term annual mean sea temperature in Alleynes Bay is about 27°C, based on multi-decadal climatology of the surrounding waters.
How do I check the current sea temperature in Alleynes Bay?
The live reading at the top of this page shows the current sea temperature in Alleynes 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
Best swim months: Jan – Feb – Mar – Apr – May – Jun – Jul – Aug – Sep – Oct – Nov – Dec
| Month | Sea | Comfort |
|---|---|---|
| Jan | 26°C | Hot |
| Feb | 26°C | Hot |
| Mar | 26°C | Hot |
| Apr | 27°C | Hot |
| May | 27°C | Hot |
| Jun ⭐ | 28°C | Hot |
| Jul | 28°C | Hot |
| Aug | 28°C | Hot |
| Sep | 28°C | Hot |
| Oct | 28°C | Hot |
| Nov | 28°C | Hot |
| Dec | 27°C | Hot |