Strunjan Water Temperature & Swim Forecast
Quiet pebble beach in a nature park.
Fresh water with a light chop and a light breeze — fresh conditions — a wetsuit is recommended.
Model estimate · modelled, not a buoy measurement. How accurate is this?
Location
Strunjan on the map, with nearby beaches and live sea temperatures.
7-day forecast
Water, air, waves, wind and UV outlook for the week ahead.
3/2mm fullsuit
At 16.6°C a 3/2mm fullsuit is the standard wetsuit for surfing and watersports.
Recommendation tuned for Strunjan's current water temperature. Individual tolerance, wind chill, and session length all matter — when in doubt, size up.
Strunjan swimming conditions summary
- Water temperature
- 16.6°C
- Water feels
- Refreshing
- Swimmable today
- Yes, but fresh — short swims or a wetsuit
- Swim conditions score
- 60/100 · Fair
- Wetsuit needed
- 3/2mm fullsuit
- Air temperature
- —
- Waves
- —
- Wind
- —
- UV index
- —
- Average sea temperature (November)
- 17.0 °C
- Warmest months to swim
- June, July, August
At 16.6°C a 3/2mm fullsuit is the standard wetsuit for surfing and watersports. 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 Strunjan right now?
The sea at Strunjan is currently 16.6°C — fresh 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 Strunjan next week?
Based on long-term November averages and the latest marine model, expect the sea around Strunjan to sit close to 17.0°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 Strunjan?
June – July – August are typically the warmest months to swim at Strunjan, with sea temperatures at their seasonal peak.
Do I need a wetsuit at Strunjan?
With water currently at 16.6°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 Strunjan today?
The sea is currently 16.6°C — fair swimming conditions. Acclimatised swimmers will be most comfortable.
- • Located in Slovenian Coast, Slovenia (Adriatic 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 Strunjan
The sea in Strunjan 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 15°C, so a 3/2mm shorty or full wetsuit makes long swims much more comfortable.
The coldest month is typically February at around 12°C, when cold-water swimmers dominate the coast.
Strunjan sea temperature history
Long-term climatology for Strunjan shows an annual mean sea temperature of 18°C, ranging from 12°C in winter to 26°C at the summer peak.
The seasonal swing is roughly 14°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 Strunjan, 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.
Strunjan sea temperature: frequently asked questions
What is the warmest month to swim in Strunjan?
August is the warmest month in Strunjan, when the sea averages about 26°C. Late-season warmth often persists a few weeks after peak.
When is the sea coldest in Strunjan?
The coldest month in Strunjan is typically February, when the water averages around 12°C. Cold-water swimmers and surfers dominate this period.
When can you swim in Strunjan without a wetsuit?
The main swimming season in Strunjan 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 Strunjan?
Outside peak summer the water in Strunjan drops toward 15°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 Strunjan?
The long-term annual mean sea temperature in Strunjan is about 18°C, based on multi-decadal climatology of the surrounding waters.
How do I check the current sea temperature in Strunjan?
The live reading at the top of this page shows the current sea temperature in Strunjan, 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 | 13°C | Cold |
| Feb | 12°C | Cold |
| Mar | 13°C | Cold |
| Apr | 15°C | Bracing |
| May | 19°C | Pleasant |
| Jun | 23°C | Warm |
| Jul | 25°C | Warm |
| Aug ⭐ | 26°C | Hot |
| Sep | 23°C | Warm |
| Oct | 20°C | Pleasant |
| Nov | 17°C | Bracing |
| Dec | 14°C | Bracing |
Nearby beaches
The closest coastline, with live water temperatures.