San Diego, California - Current temperature and weather conditions. Detailed hourly weather forecast for today - including weather conditions, temperature, pressure, humidity, precipitation, dewpoint, wind, visibility, and UV index data. Click a location below for detailed forecast. Highs Friday. Coast: 70s, valleys: 80s, mountains: 70s, high desert: 80s, low desert: upper 90s. Read More. Highs Saturday. Coast: 70s, valleys: 80s to low 90s, mountains: 70s to low 80s, high desert: 80s, low desert: 100-104 degrees. Read More. Sea water temperature forecast and historical data for San Diego (CA). Today's ocean surface temperature report. Average monthly ocean temperature Today’s and tonight’s San Diego, California weather forecast, weather conditions and Doppler radar from The Weather Channel and Weather.com Temperature is measured with a thermometer. Thermometers are calibrated in various temperature scales that historically have relied on various reference points and thermometric substances for definition. Click a location below for detailed forecast. Get accurate hourly forecasts for today, tonight, and tomorrow, along with 10-day daily forecasts and weather radar for San-Diego, CA with MSN Weather. Stay updated on precipitation, severe. Forecast conditions Partly cloudy skies. High 77F. Winds NW at 10 to 15 mph. Forecast conditions Some clouds in the morning will give way to mainly sunny skies for the afternoon. High 78F. Winds. Current weather in San Diego, CA. Check current conditions in San Diego, CA with radar, hourly, and more. Hourly weather forecast in San Diego, CA. Check current conditions in San Diego, CA with radar, hourly, and more.