Historical weather data, all-time temperature records, and monthly climate averages for Irvine, CA. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 5th in Irvine typically feels like a mild spring day, with average highs of 72° and lows of 49°. That said, the date has real range in the record books — from a scorching 104° in 1989 to a near-freezing 34° in 1945. Rain is unlikely but not impossible, with just a 16% historical chance of any precipitation.
Irvine's all-time extremes tell the story of a place that's mostly mild but occasionally surprises. The mercury has touched 114° (July 6, 2018) and plunged to 16° (January 12, 1989) — a 98-degree spread across the record books. The wettest single day on record dropped 4.69 inches back in February 1927.
Irvine is about as close to year-round pleasant as it gets — monthly average highs range from just 68° in January to 86° in late August, barely a 18-degree swing. Peak warmth arrives late summer, while winter stays mild enough that even January rarely dips below comfortable. If you're trying to dodge rain, avoid February, when weekly precipitation averages peak around 0.76 inches.