Rio Del Mar State Beach Water Temperature & Swim Forecast
Long Aptos-village 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
Rio Del Mar State 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 26.5°C the water is warm enough to swim and surf in just a swimsuit or boardshorts.
Recommendation tuned for Rio Del Mar State Beach's current water temperature. Individual tolerance, wind chill, and session length all matter — when in doubt, size up.
Rio Del Mar State Beach swimming conditions summary
- Water temperature
- 26.5°C
- Water feels
- Warm
- Swimmable today
- Yes — comfortable for most swimmers
- Swim conditions score
- 88/100 · Excellent
- Wetsuit needed
- No wetsuit
- Air temperature
- —
- Waves
- —
- Wind
- —
- UV index
- —
- Average sea temperature (September)
- 27.0 °C
- Warmest months to swim
- July, August, September
At 26.5°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 Rio Del Mar State Beach right now?
The sea at Rio Del Mar State Beach is currently 26.5°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 Rio Del Mar State Beach next week?
Based on long-term September averages and the latest marine model, expect the sea around Rio Del Mar State Beach to sit close to 25.6°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 Rio Del Mar State Beach?
July – August – September are typically the warmest months to swim at Rio Del Mar State Beach, with sea temperatures at their seasonal peak.
Do I need a wetsuit at Rio Del Mar State Beach?
With water currently at 26.5°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 Rio Del Mar State Beach today?
The sea is currently 26.5°C — excellent swimming conditions. Most swimmers will find it pleasant.
- • Located in California, United States (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 Rio Del Mar State Beach
The sea in Rio Del Mar State Beach peaks in July, when the water averages around 28°C.
The main swimming season runs from April – November, when surface temperatures stay comfortable for extended sessions.
On average, 8 months a year sit above 20°C — the threshold most swimmers describe as pleasant without a wetsuit.
Shoulder months like March and December are noticeably cooler but often quieter, with fewer crowds and steadier weather.
The coldest month is typically January at around 18°C, when cold-water swimmers dominate the coast.
Rio Del Mar State Beach sea temperature history
Long-term climatology for Rio Del Mar State Beach shows an annual mean sea temperature of 23°C, ranging from 18°C in winter to 28°C at the summer peak.
The seasonal swing is roughly 10°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 Rio Del Mar State 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.
Rio Del Mar State Beach sea temperature: frequently asked questions
What is the warmest month to swim in Rio Del Mar State Beach?
July is the warmest month in Rio Del Mar State Beach, when the sea averages about 28°C. Late-season warmth often persists a few weeks after peak.
When is the sea coldest in Rio Del Mar State Beach?
The coldest month in Rio Del Mar State Beach is typically January, when the water averages around 18°C. Cold-water swimmers and surfers dominate this period.
When can you swim in Rio Del Mar State Beach without a wetsuit?
The main swimming season in Rio Del Mar State Beach runs from April – November — about 8 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 Rio Del Mar State Beach?
Outside peak summer the water in Rio Del Mar State Beach drops toward 19°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 Rio Del Mar State Beach?
The long-term annual mean sea temperature in Rio Del Mar State Beach is about 23°C, based on multi-decadal climatology of the surrounding waters.
How do I check the current sea temperature in Rio Del Mar State Beach?
The live reading at the top of this page shows the current sea temperature in Rio Del Mar State 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: Apr – May – Jun – Jul – Aug – Sep – Oct – Nov
| Month | Sea | Comfort |
|---|---|---|
| Jan | 18°C | Pleasant |
| Feb | 18°C | Pleasant |
| Mar | 19°C | Pleasant |
| Apr | 21°C | Pleasant |
| May | 23°C | Warm |
| Jun | 26°C | Hot |
| Jul ⭐ | 28°C | Hot |
| Aug | 28°C | Hot |
| Sep | 27°C | Hot |
| Oct | 25°C | Warm |
| Nov | 22°C | Warm |
| Dec | 19°C | Pleasant |
Nearby beaches
The closest coastline, with live water temperatures.