Astir Beach Water Temperature & Swim Forecast
Athens Riviera family beach.
Warm water with a light chop and a light breeze — great swimming conditions.
Model estimate · modelled, not a buoy measurement. How accurate is this?
Location
Astir 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.
No wetsuit
At 25.1°C the water is warm enough to swim and surf in just a swimsuit or boardshorts.
Recommendation tuned for Astir Beach's current water temperature. Individual tolerance, wind chill, and session length all matter — when in doubt, size up.
Astir Beach swimming conditions summary
- Water temperature
- 25.1°C
- Water feels
- Warm
- Swimmable today
- Yes — comfortable for most swimmers
- Swim conditions score
- 91/100 · Excellent
- Wetsuit needed
- No wetsuit
- Air temperature
- —
- Waves
- —
- Wind
- —
- UV index
- —
- Average sea temperature (September)
- 25.0 °C
- Warmest months to swim
- July, August, September
At 25.1°C the water is warm enough to swim and surf in just a swimsuit or boardshorts. 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 Astir Beach right now?
The sea at Astir Beach is currently 25.1°C — excellent 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 Astir Beach next week?
Based on long-term September averages and the latest marine model, expect the sea around Astir Beach to sit close to 22.9°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 Astir Beach?
July – August – September are typically the warmest months to swim at Astir Beach, with sea temperatures at their seasonal peak.
Do I need a wetsuit at Astir Beach?
With water currently at 25.1°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 Astir Beach today?
The sea is currently 25.1°C — excellent swimming conditions. Most swimmers will find it pleasant.
- • Located in Athens Riviera, Greece (Aegean 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 Astir Beach
The sea in Astir Beach peaks in August, when the water averages around 26°C.
The main swimming season runs from May – November, when surface temperatures stay comfortable for extended sessions.
On average, 7 months a year sit above 20°C — the threshold most swimmers describe as pleasant without a wetsuit.
Shoulder months like April and December are noticeably cooler but often quieter, with fewer crowds and steadier weather.
Outside peak season the water drops toward 17°C, so a 3/2mm shorty or full wetsuit makes long swims much more comfortable.
The coldest month is typically February at around 15°C, when cold-water swimmers dominate the coast.
Astir Beach sea temperature history
Long-term climatology for Astir Beach shows an annual mean sea temperature of 20°C, ranging from 15°C in winter to 26°C at the summer peak.
The seasonal swing is roughly 11°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 Astir 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.
Astir Beach sea temperature: frequently asked questions
What is the warmest month to swim in Astir Beach?
August is the warmest month in Astir Beach, when the sea averages about 26°C. Late-season warmth often persists a few weeks after peak.
When is the sea coldest in Astir Beach?
The coldest month in Astir Beach is typically February, when the water averages around 15°C. Cold-water swimmers and surfers dominate this period.
When can you swim in Astir Beach without a wetsuit?
The main swimming season in Astir Beach runs from May – November — about 7 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 Astir Beach?
Outside peak summer the water in Astir Beach drops toward 17°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 Astir Beach?
The long-term annual mean sea temperature in Astir Beach is about 20°C, based on multi-decadal climatology of the surrounding waters.
How do I check the current sea temperature in Astir Beach?
The live reading at the top of this page shows the current sea temperature in Astir 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: May – Jun – Jul – Aug – Sep – Oct – Nov
| Month | Sea | Comfort |
|---|---|---|
| Jan | 16°C | Bracing |
| Feb | 15°C | Bracing |
| Mar | 15°C | Bracing |
| Apr | 17°C | Bracing |
| May | 20°C | Pleasant |
| Jun | 23°C | Warm |
| Jul | 25°C | Warm |
| Aug ⭐ | 26°C | Hot |
| Sep | 25°C | Warm |
| Oct | 22°C | Warm |
| Nov | 20°C | Pleasant |
| Dec | 17°C | Bracing |
Nearby beaches
The closest coastline, with live water temperatures.