Castaway Island Beach Water Temperature & Swim Forecast
Iconic Mamanuca palm-fringed island beach.
Pleasant water with a light chop and a light breeze — great swimming conditions.
Model estimate · modelled, not a buoy measurement. How accurate is this?
Location
Castaway Island Beach on the map, with nearby beaches and live sea temperatures.
7-day forecast
Water, air, waves, wind and UV outlook for the week ahead.
Rash vest or swimsuit
At 22.3°C most swimmers and surfers are comfortable in a swimsuit or thin rash top.
Recommendation tuned for Castaway Island Beach's current water temperature. Individual tolerance, wind chill, and session length all matter — when in doubt, size up.
Castaway Island Beach swimming conditions summary
- Water temperature
- 22.3°C
- Water feels
- Pleasant
- Swimmable today
- Yes — comfortable for most swimmers
- Swim conditions score
- 85/100 · Excellent
- Wetsuit needed
- Rash vest or swimsuit
- Air temperature
- —
- Waves
- —
- Wind
- —
- UV index
- —
- Average sea temperature (September)
- 23.0 °C
- Warmest months to swim
- July, August, September
At 22.3°C most swimmers and surfers are comfortable in a swimsuit or thin rash top. 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 Castaway Island Beach right now?
The sea at Castaway Island Beach is currently 22.3°C — great 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 Castaway Island Beach next week?
Based on long-term September averages and the latest marine model, expect the sea around Castaway Island Beach to sit close to 22.3°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 Castaway Island Beach?
July – August – September are typically the warmest months to swim at Castaway Island Beach, with sea temperatures at their seasonal peak.
Do I need a wetsuit at Castaway Island Beach?
With water currently at 22.3°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 Castaway Island Beach today?
The sea is currently 22.3°C — excellent swimming conditions. Most swimmers will find it pleasant.
- • Located in Western, Fiji (Pacific Ocean).
- • 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 Castaway Island Beach
The sea in Castaway Island Beach peaks in July, when the water averages around 23°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 20°C, when cold-water swimmers dominate the coast.
Castaway Island Beach sea temperature history
Long-term climatology for Castaway Island Beach shows an annual mean sea temperature of 21°C, ranging from 20°C in winter to 23°C at the summer peak.
The seasonal swing is roughly 3°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 Castaway Island Beach, 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.
Castaway Island Beach sea temperature: frequently asked questions
What is the warmest month to swim in Castaway Island Beach?
July is the warmest month in Castaway Island Beach, when the sea averages about 23°C. Late-season warmth often persists a few weeks after peak.
When is the sea coldest in Castaway Island Beach?
The coldest month in Castaway Island Beach is typically January, when the water averages around 20°C. Cold-water swimmers and surfers dominate this period.
When can you swim in Castaway Island Beach without a wetsuit?
The main swimming season in Castaway Island Beach 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 Castaway Island Beach?
Outside peak summer the water in Castaway Island Beach drops toward 20°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 Castaway Island Beach?
The long-term annual mean sea temperature in Castaway Island Beach is about 21°C, based on multi-decadal climatology of the surrounding waters.
How do I check the current sea temperature in Castaway Island Beach?
The live reading at the top of this page shows the current sea temperature in Castaway Island Beach, 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 | 20°C | Pleasant |
| Feb | 20°C | Pleasant |
| Mar | 20°C | Pleasant |
| Apr | 20°C | Pleasant |
| May | 21°C | Pleasant |
| Jun | 22°C | Warm |
| Jul ⭐ | 23°C | Warm |
| Aug | 23°C | Warm |
| Sep | 23°C | Warm |
| Oct | 22°C | Warm |
| Nov | 21°C | Pleasant |
| Dec | 20°C | Pleasant |
Nearby beaches
The closest coastline, with live water temperatures.