Historical weather data, all-time temperature records, and monthly climate averages for Gilroy, CA. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 4th in Gilroy runs mild, with highs typically landing around 71° and lows near 44°. The date has seen some wild swings though — a scorching 91° back in 1961 and a near-freezing 34° as recently as 2015. Rain is unlikely, with just a 17% historical chance of any precipitation.
Gilroy is classic Central California valley — it can get seriously hot. The all-time record of 115° in July 1972 puts it firmly in baking territory, while the coldest ever recorded was 17° in December 1990. Snow is essentially a ghost story here, with the only measurable snowfall on record being a half-inch way back in 1915.
Summer is the main event in Gilroy, with mid-July highs averaging 89° and the thermometer staying in the upper 80s from July through September. If heat isn't your thing, January and December are the coolest months, both averaging around 60°. Rain is concentrated in winter — late January is the wettest stretch of the year, but even then it's modest by most standards.