Rialto Beach Sea Water Temperature
A cool beach on the Coastal Waters, warmest around September at about 13.5°C. Today's reading, 7-day forecast, and monthly averages below.
Rialto Beach water temperature
Wetsuit strongly recommended. Sudden entry may cause cold shock. Suitable only for brief, brisk plunges.
7-Day Water Temperature Forecast
Rialto Beach Monthly Water Temperature Averages
Historical monthly climatology. The warmest water in Rialto Beach occurs inJune, July, August, September — peaking at13.5°C (56.3°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 | 7.2°C | 8.9°C | 10.5°C | Very Cold (< 16°C) |
| February | 7°C | 8.7°C | 10.6°C | Very Cold (< 16°C) |
| March | 7.8°C | 9.1°C | 10.9°C | Very Cold (< 16°C) |
| April | 7.6°C | 9.9°C | 11.8°C | Very Cold (< 16°C) |
| May | 9.7°C | 11.6°C | 14.3°C | Very Cold (< 16°C) |
| June | 10.4°C | 12.5°C | 14.8°C | Very Cold (< 16°C) |
| July | 10.9°C | 13.2°C | 16°C | Very Cold (< 16°C) |
| August | 10.7°C | 13.1°C | 15.4°C | Very Cold (< 16°C) |
| SeptemberCurrent | 11.3°C | 13.5°C | 16.2°C | Very Cold (< 16°C) |
| October | 9.5°C | 12.1°C | 14.6°C | Very Cold (< 16°C) |
| November | 9.4°C | 11°C | 13.3°C | Very Cold (< 16°C) |
| December | 8.1°C | 9.8°C | 12.9°C | Very Cold (< 16°C) |
Swimming FAQs for Rialto Beach
Is the sea warm enough to swim in Rialto Beach today?
Typical sea surface temperature in Rialto Beach this time of year is 13.5°C (56.3°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 Rialto Beach?
The highest water temperatures in Rialto Beach typically occur duringJune, July, August, September, when monthly averages reach peak seasonal levels.
What is the typical water temperature in Rialto Beach in September?
Historically in September, water temperatures in Rialto Beach average around13.5°C (56.3°F), fluctuating between a recorded minimum of 11.3°C and a maximum of 16.2°C.