Nosy Iranja Water Temperature & Swim Forecast
Twin-island sandbar beach.
Pleasant water with a light chop and a light breeze — good swimming conditions.
Model estimate · modelled, not a buoy measurement. How accurate is this?
Location
Nosy Iranja on the map, with nearby beaches and live sea temperatures.
7-day forecast
Water, air, waves, wind and UV outlook for the week ahead.
Shorty 2mm
At 21.5°C a 2mm shorty keeps surfers warm; lap swimmers can usually skip the neoprene.
Recommendation tuned for Nosy Iranja's current water temperature. Individual tolerance, wind chill, and session length all matter — when in doubt, size up.
Nosy Iranja swimming conditions summary
- Water temperature
- 21.5°C
- Water feels
- Pleasant
- Swimmable today
- Yes — comfortable for most swimmers
- Swim conditions score
- 83/100 · Excellent
- Wetsuit needed
- Shorty 2mm
- Air temperature
- —
- Waves
- —
- Wind
- —
- UV index
- —
- Average sea temperature (September)
- 21.0 °C
- Warmest months to swim
- January, February, March
At 21.5°C a 2mm shorty keeps surfers warm; lap swimmers can usually skip the neoprene. 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 Nosy Iranja right now?
The sea at Nosy Iranja is currently 21.5°C — good 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 Nosy Iranja next week?
Based on long-term September averages and the latest marine model, expect the sea around Nosy Iranja to sit close to 21.7°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 Nosy Iranja?
January – February – March are typically the warmest months to swim at Nosy Iranja, with sea temperatures at their seasonal peak.
Do I need a wetsuit at Nosy Iranja?
With water currently at 21.5°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 Nosy Iranja today?
The sea is currently 21.5°C — excellent swimming conditions. Most swimmers will find it pleasant.
- • Located in Diana, Madagascar (Indian 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 Nosy Iranja
The sea in Nosy Iranja peaks in February, when the water averages around 25°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 July at around 20°C, when cold-water swimmers dominate the coast.
Nosy Iranja sits in the Southern Hemisphere, so the warmest sea coincides with the December–February summer and the coolest with July–August.
Nosy Iranja sea temperature history
Long-term climatology for Nosy Iranja shows an annual mean sea temperature of 22°C, ranging from 20°C in winter to 25°C at the summer peak.
The seasonal swing is roughly 5°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 Nosy Iranja, 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.
Nosy Iranja sea temperature: frequently asked questions
What is the warmest month to swim in Nosy Iranja?
February is the warmest month in Nosy Iranja, when the sea averages about 25°C. Late-season warmth often persists a few weeks after peak.
When is the sea coldest in Nosy Iranja?
The coldest month in Nosy Iranja is typically July, when the water averages around 20°C. Cold-water swimmers and surfers dominate this period.
When can you swim in Nosy Iranja without a wetsuit?
The main swimming season in Nosy Iranja 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 Nosy Iranja?
Outside peak summer the water in Nosy Iranja 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 Nosy Iranja?
The long-term annual mean sea temperature in Nosy Iranja is about 22°C, based on multi-decadal climatology of the surrounding waters.
How do I check the current sea temperature in Nosy Iranja?
The live reading at the top of this page shows the current sea temperature in Nosy Iranja, 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 | 24°C | Warm |
| Feb ⭐ | 25°C | Warm |
| Mar | 24°C | Warm |
| Apr | 23°C | Warm |
| May | 22°C | Warm |
| Jun | 21°C | Pleasant |
| Jul | 20°C | Pleasant |
| Aug | 20°C | Pleasant |
| Sep | 21°C | Pleasant |
| Oct | 22°C | Warm |
| Nov | 23°C | Warm |
| Dec | 24°C | Warm |
Nearby beaches
The closest coastline, with live water temperatures.