Historical weather data, all-time temperature records, and monthly climate averages for Tustin Legacy, CA. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 4th in Tustin Legacy typically feels like a mild spring day, with average highs around 72° and lows near 49°. History shows it can surprise you though — this date has swung from a scorching 98° in 1989 all the way down to a freezing 33° in 1945. There's a modest 16% chance of rain today, but snow is essentially off the table.
Tustin Legacy lives up to Southern California's sunny reputation, but the extremes are real — the mercury has hit 114° as recently as July 2018 and plunged to 16° in January 1989. The wettest single day on record dropped 4.69 inches of rain back in February 1927, a reminder that this area's rare storms can pack a punch.
Tustin Legacy is warm year-round, with average highs never dipping below 68° even in the dead of winter. Peak heat arrives late summer, with the warmest week of the year averaging 86° around late August through early September. If you're trying to dodge rain, aim for summer — the wettest stretch clusters in early February, averaging 0.76 inches for the week.