Muir Beach Sea Water Temperature
A temperate beach on the Coastal Waters, warmest around September at about 14.5°C. Today's reading, 7-day forecast, and monthly averages below.
Muir Beach water temperature
Wetsuit strongly recommended. Sudden entry may cause cold shock. Suitable only for brief, brisk plunges.
7-Day Water Temperature Forecast
Muir Beach Monthly Water Temperature Averages
Historical monthly climatology. The warmest water in Muir Beach occurs inJuly, August, September, October — peaking at14.5°C (58.1°F) in September.
Year-Round Water Temperature Curve (°C / °F)
Hover a bar for detailsFull 12-month data table — min / avg / max & swimming comfort
| Month | Min Water Temp | Average Water Temp | Max Water Temp | Swimming Comfort |
|---|---|---|---|---|
| January | 9.9°C | 11.5°C | 13°C | Very Cold (< 16°C) |
| February | 9.9°C | 11.6°C | 14.2°C | Very Cold (< 16°C) |
| March | 9.5°C | 11.8°C | 14.1°C | Very Cold (< 16°C) |
| April | 9.6°C | 11.4°C | 13.4°C | Very Cold (< 16°C) |
| May | 9.7°C | 11.5°C | 14.6°C | Very Cold (< 16°C) |
| June | 9.7°C | 12.6°C | 14.5°C | Very Cold (< 16°C) |
| July | 10.8°C | 13.7°C | 16.7°C | Very Cold (< 16°C) |
| August | 11.4°C | 14.2°C | 16.6°C | Very Cold (< 16°C) |
| SeptemberCurrent | 13.2°C | 14.5°C | 17.4°C | Very Cold (< 16°C) |
| October | 11.7°C | 13.8°C | 16.2°C | Very Cold (< 16°C) |
| November | 11°C | 13.1°C | 15.4°C | Very Cold (< 16°C) |
| December | 10.6°C | 12.1°C | 15.2°C | Very Cold (< 16°C) |
Swimming FAQs for Muir Beach
Is the sea warm enough to swim in Muir Beach today?
Typical sea surface temperature in Muir Beach this time of year is 14.5°C (58.1°F) — classified as Very Cold (< 16°C). Wetsuit strongly recommended. Sudden entry may cause cold shock. Suitable only for brief, brisk plunges. Live readings load automatically.
What are the warmest months for swimming in Muir Beach?
The highest water temperatures in Muir Beach typically occur duringJuly, August, September, October, when monthly averages reach peak seasonal levels.
What is the typical water temperature in Muir Beach in September?
Historically in September, water temperatures in Muir Beach average around14.5°C (58.1°F), fluctuating between a recorded minimum of 13.2°C and a maximum of 17.4°C.