Historical weather data, all-time temperature records, and monthly climate averages for Pico Rivera, CA. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 4th in Pico Rivera typically lands right in that pleasant spring sweet spot — expect a high near 70° and a low around 53°. There's a 20% chance of rain, a reminder that Southern California's wet season hasn't fully let go yet. The date's range is wild though: it's hit 100° back in 1989 and dipped to 43° in 1976.
Pico Rivera is firmly in Southern California heat territory — the all-time record of 113° set in September 2010 puts it among the most extreme urban heat events in the region's history. On the other end, 28° in January 1913 shows this area isn't immune to a hard freeze, and a single-day deluge of 5.88" in March 1938 remains a testament to how dramatically atmospheric rivers can unload here.
Pico Rivera stays mild year-round, with average highs ranging only from 66° in early January to 84° in late August — a remarkably narrow swing for a place that can occasionally flirt with triple digits. If you're chasing warmth, aim for late summer; if you want the best shot at rain, the last week of December averages 0.9" of precipitation. Honestly, any month is a safe bet for decent weather here.