Water temperature in Clear Lake (CA) in January

Is it warm enough to swim in Clear Lake in January? Average water temperature in Clear Lake in January is 48.4°F and therefore is not suitable for comfortable swimming. The warmest water in Clear Lake in January is 53.4°F, and the coldest is 45.9°F. To find out the sea temperature today and in the coming days, go to Current sea temperature in Clear Lake

Changes water temperature in Clear Lake in January 2026, 2025

To get an accurate forecast for the water temperature in Clear Lake for any chosen month, compare two years within a 10 year range using the chart below. In addition to the sea water temperature in Clear Lake, the selected years in the table also show the values of the maximum and minimum temperatures on each of the days of January.

Average water temperature in Clear Lake in January over a decade

Chart comparing the height of waves in Clear Lake in January over the past years. The red line indicates the height of the waves when swimming in the sea is prohibited. To view the current sea conditions, click on the graph.

You can also view information about water temperature for other months by clicking on the month button below

Places with the warmest average sea water temperature in California in January. In addition, the maximum and minimum water temperatures for that month, recorded over the last decade, are shown

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Our report for Clear Lake is compiled using satellite data together with in-situ observations to get the most reliable daily data of sea surface temperatures, surf forecasts, current temperatures and weather forecasts.