Costa Rei Water Temperature & Swim Forecast
Eight-km white-sand south-Sardinia 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
Costa Rei 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 23.8°C most swimmers and surfers are comfortable in a swimsuit or thin rash top.
Recommendation tuned for Costa Rei's current water temperature. Individual tolerance, wind chill, and session length all matter — when in doubt, size up.
Costa Rei swimming conditions summary
- Water temperature
- 23.8°C
- Water feels
- Pleasant
- Swimmable today
- Yes — comfortable for most swimmers
- Swim conditions score
- 88/100 · Excellent
- Wetsuit needed
- Rash vest or swimsuit
- Air temperature
- —
- Waves
- —
- Wind
- —
- UV index
- —
- Average sea temperature (September)
- 24.0 °C
- Warmest months to swim
- July, August, September
At 23.8°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 Costa Rei right now?
The sea at Costa Rei is currently 23.8°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 Costa Rei next week?
Based on long-term September averages and the latest marine model, expect the sea around Costa Rei to sit close to 21.9°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 Costa Rei?
July – August – September are typically the warmest months to swim at Costa Rei, with sea temperatures at their seasonal peak.
Do I need a wetsuit at Costa Rei?
With water currently at 23.8°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 Costa Rei today?
The sea is currently 23.8°C — excellent swimming conditions. Most swimmers will find it pleasant.
- • Located in Sardinia, Italy (Tyrrhenian Sea).
- • 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 Costa Rei
The sea in Costa Rei peaks in August, when the water averages around 26°C.
The main swimming season runs from June – October, when surface temperatures stay comfortable for extended sessions.
On average, 5 months a year sit above 20°C — the threshold most swimmers describe as pleasant without a wetsuit.
Shoulder months like May and November are noticeably cooler but often quieter, with fewer crowds and steadier weather.
Outside peak season the water drops toward 16°C, so a 3/2mm shorty or full wetsuit makes long swims much more comfortable.
The coldest month is typically February at around 13°C, when cold-water swimmers dominate the coast.
Costa Rei sea temperature history
Long-term climatology for Costa Rei shows an annual mean sea temperature of 19°C, ranging from 13°C in winter to 26°C at the summer peak.
The seasonal swing is roughly 13°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 Costa Rei, 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.
Costa Rei sea temperature: frequently asked questions
What is the warmest month to swim in Costa Rei?
August is the warmest month in Costa Rei, when the sea averages about 26°C. Late-season warmth often persists a few weeks after peak.
When is the sea coldest in Costa Rei?
The coldest month in Costa Rei is typically February, when the water averages around 13°C. Cold-water swimmers and surfers dominate this period.
When can you swim in Costa Rei without a wetsuit?
The main swimming season in Costa Rei runs from June – October — about 5 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 Costa Rei?
Outside peak summer the water in Costa Rei drops toward 16°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 Costa Rei?
The long-term annual mean sea temperature in Costa Rei is about 19°C, based on multi-decadal climatology of the surrounding waters.
How do I check the current sea temperature in Costa Rei?
The live reading at the top of this page shows the current sea temperature in Costa Rei, 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: Jun – Jul – Aug – Sep – Oct
| Month | Sea | Comfort |
|---|---|---|
| Jan | 14°C | Bracing |
| Feb | 13°C | Cold |
| Mar | 14°C | Bracing |
| Apr | 16°C | Bracing |
| May | 19°C | Pleasant |
| Jun | 23°C | Warm |
| Jul | 25°C | Warm |
| Aug ⭐ | 26°C | Hot |
| Sep | 24°C | Warm |
| Oct | 21°C | Pleasant |
| Nov | 18°C | Pleasant |
| Dec | 15°C | Bracing |
Nearby beaches
The closest coastline, with live water temperatures.