Historical weather data, all-time temperature records, and monthly climate averages for Los Osos, CA. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 4th in Los Osos is a mild shoulder-season day, historically averaging a high of 68° and a low of 45°. There's only an 18% chance of rain, though the date has seen its wild moments — a scorching 94° in 1961 and a freezing 32° low in 1999 show the range is wider than you'd expect.
Los Osos keeps its cool by Central California standards, but extremes do happen — the mercury has hit 113° (September 6, 2020) and plunged to 17° (December 23, 1990). The wettest single day on record dumped 6.05 inches on January 9, 2023, a reminder that winter storms here can be serious.
Los Osos is a study in mild consistency, with average highs ranging only from 63° in early January to 80° in late August and early September. If you want the warmest weather, aim for late summer; if you want to avoid rain, skip December through February, when the wettest stretch of the year — averaging over 1.5 inches in a single week — tends to arrive.