Powered by Create your own unique … It is not unlikely in the fall and spring that water temperatures can be in the low 50’s or colder. The Big Bear Municipal Water District (BBMWD) opened The Carol Morrison East Launch Ramp for the 2015 season on April 1, and all five private Big Bear Lake marinas are now open. In the event of a capsized boat or swim from shore, a sudden immersion into the cold lake can cause instant blackout. Average water temperature in Big Bear Lake in July is 18.3°C/64.9°F and therefore is not suitable for comfortable swimming. To get an accurate forecast for the water temperature in Big Bear Lake for any chosen month, compare two years within a 10 year range using the chart below. Big Bear Lake is a reservoir in the San Bernardino Mountains, in San Bernardino County, California, United States.It is a completely snow-fed lake, having no other means of tributaries or mechanical replenishment. Partly Cloudy. Weather Summary. Big Bear Lake's water temperature 51° Today's forecast Partly Cloudy H:72° L:50° Wind:4-11 mph Big Bear Lake . On May 8, the Duane Boyer West Launch Ramp will open. Its location at over 7,000' elevation in the San Bernardino mountain range makes for winters with snow! Wind. BIG BEAR LAKE WEATHER. Throughout the month of November daytime temperatures will generally reach highs of around 21°C that's about 70°F. The BBMWD also planted approximately one million fingerling rainbows on April 1. Big Bear Lake in Southern California is one of those rare, 4 seasons destinations. H: 72 L: 50. away. Here is a great link to Real Time Weather Conditions at Pine Knot Marina - The Dock Club. 54.3. Temperature. Water from Bear Lake can be pumped by the Lifton pumping station through the outlet canal and into the Bear River. The warmest water temperature in Big Bear Lake in March is 16°C/60.8°F, and the coldest water temperature in March is 16°C/60.8°F.  Big Bear Lake Water Temperature and Lake Level Current Wind Speed  As of Aug. 2015 - Lake down 13ft. Water Temp. The warmest water temperature in Big Bear Lake in July is 22°C/71.6°F, and the coldest water temperature in July is 16°C/60.8°F. Problem. The climate profile is taken from closest available data source to Big Bear Lake. From the beaches of Southern California you can stand in the warm, sunny 70 degree weather and see snow on the mountains where Big Bear Lake is located. On average Big Bear Lake water temperature fluctuates around 65° in the summer. Water levels vary 1-2 meters with releases of storage water in the top portion of the lake; however, there is a proposal to increase the volume of Bear River water stored in Bear Lake (see discussion below). Big Bear Current Radar Map. H: 4 L: 11. These fish are expected to be from six to 12 inches long within three … At night the average minimum temperature drops down to around 8°C, that's 46°F. Air. 1464 miles.