Historical weather data, all-time temperature records, and monthly climate averages for Lake Arrowhead, CA. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 4th at Lake Arrowhead runs mild, with an average high of 74° and a low of 45° across 23 years of records. The date has seen some wild swings though — from a scorching 93° in 1961 down to a chilly 37° low back in 1956. Rain is unlikely but not impossible, with just a 17% chance of precipitation.
Lake Arrowhead plays in extremes — the thermometer has climbed as high as 113° (September 6, 1955) and plunged to 20° (January 12, 1949), a 93-degree spread that tells you this is no mild coastal town. A single January day in 1956 dumped 4.03 inches of rain, and the day before the record cold brought 6.5 inches of snow.
Summer is the main event here, with highs averaging 95° during the peak weeks of mid-July through August — but if you want to escape the heat, January's average high of 62° and occasional snow make it a genuine four-season destination. The wettest stretch falls in late January, averaging nearly an inch of precipitation per week. Spring and fall offer the sweet spot: mild temps in the 70s–80s with minimal rain.