Big River Beach Water Temperature & Swim Forecast
River-mouth Mendocino 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
Big River 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 26.6°C the water is warm enough to swim and surf in just a swimsuit or boardshorts.
Recommendation tuned for Big River Beach's current water temperature. Individual tolerance, wind chill, and session length all matter — when in doubt, size up.
Big River Beach swimming conditions summary
- Water temperature
- 26.6°C
- Water feels
- Warm
- Swimmable today
- Yes — comfortable for most swimmers
- Swim conditions score
- 87/100 · 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 26.6°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 Big River Beach right now?
The sea at Big River Beach is currently 26.6°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 Big River Beach next week?
Based on long-term September averages and the latest marine model, expect the sea around Big River 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 Big River Beach?
July – August – September are typically the warmest months to swim at Big River Beach, with sea temperatures at their seasonal peak.
Do I need a wetsuit at Big River Beach?
With water currently at 26.6°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 Big River Beach today?
The sea is currently 26.6°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 Big River Beach
The sea in Big River 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.
Big River Beach sea temperature history
Long-term climatology for Big River 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 Big River 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.
Big River Beach sea temperature: frequently asked questions
What is the warmest month to swim in Big River Beach?
July is the warmest month in Big River Beach, when the sea averages about 28°C. Late-season warmth often persists a few weeks after peak.
When is the sea coldest in Big River Beach?
The coldest month in Big River Beach is typically January, when the water averages around 18°C. Cold-water swimmers and surfers dominate this period.
When can you swim in Big River Beach without a wetsuit?
The main swimming season in Big River 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 Big River Beach?
Outside peak summer the water in Big River 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 Big River Beach?
The long-term annual mean sea temperature in Big River Beach is about 23°C, based on multi-decadal climatology of the surrounding waters.
How do I check the current sea temperature in Big River Beach?
The live reading at the top of this page shows the current sea temperature in Big River 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.