Historical weather data, all-time temperature records, and monthly climate averages for South San Jose Hills, CA. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
South San Jose Hills sits in one of Southern California's inland hot spots, where summer temperatures routinely push into the 90s and the thermometer has hit as high as 118°. Today's historical average reflects a climate that runs warm year-round, with even the coolest months averaging highs in the upper 60s.
The all-time high of 118° on July 6, 2018 puts South San Jose Hills among the most extreme heat pockets in the greater LA area. On the other end, the coldest the thermometer has ever dropped is 29°, recorded on January 14, 2013 — a rare hard freeze for a region that rarely sees frost.
South San Jose Hills is warmest from late August through early September, when average highs peak around 97°, and coolest at the end of December, when highs settle near 67°. The driest stretch of the year ironically falls right at the start of January, despite that being the heart of the rainy season. If you're heat-sensitive, plan visits between November and March, when conditions are mild and manageable.