Historical weather data, all-time temperature records, and monthly climate averages for San Fernando, CA. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 5th in San Fernando runs mild and mostly dry — across 79 years of records, the average high lands at 63° with only a 16% chance of rain. This year actually set the warmest high ever recorded on this date at 69°, just one degree above what was a frigid 41° low in 2024.
San Fernando plays for keeps on the extremes — the valley baked to a scorching 115° on September 7, 2024, while the coldest day on record was a sharp 33° back in December 1967. Rain is rare but can be dramatic: a single February day in 1973 dropped 5.74 inches, and the valley even saw 4 inches of snow in January 1949.
Summer is long and hot here, with the warmest week of the year averaging a 97° high in early August — plan accordingly if heat isn't your thing. If you want mild, the sweet spot is mid-March, when highs hover around 62°. Rain is almost entirely a winter story, peaking in early February with about 1.25 inches per week on average.