Historical weather data, all-time temperature records, and monthly climate averages for Santee, CA. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 5th in Santee typically feels like a mild spring day, with highs averaging 74° and lows around 50°. There's only a 16% chance of rain, though the date has seen some wild swings — from a scorching 102° back in 1989 to a chilly 39° low in 1999.
Santee runs hot, and the numbers prove it — the all-time record of 114° set on September 5, 2020 is among the most extreme heat ever recorded in the San Diego area. The thermometer has dipped as low as 25° (Christmas Day, 1987) and a single storm dropped 3.8 inches of rain on December 22, 2010.
Santee is warm year-round, with average highs never dipping below 68° even in late December. Peak heat arrives in late summer — the week of September 3rd averages a sweltering 91° — while the wettest stretch falls in late February through early March, averaging under an inch per week. If you're heat-averse, winter is your window; if you're chasing sun, almost any week will do.