San Jose, California climate: Normal weather by month, frost dates and records

What is the weather like in San Jose each month?

August is the warmest month, with normal highs of 81°F; December the coldest, with normal lows of 42°F. The most precipitation falls in January (2.80 in), the least in July (0.00 in).

Each month has its own page with the day-by-day normals, the month's records and its recent years:

• Jan
• Feb
• Mar
• Apr
• May
• Jun
• Jul
• Aug
• Sep
• Oct
• Nov
• Dec

When is the best weather to visit San Jose?

Normal highs sit between 65°F and 85°F in March, April, May, June, July, August, September, October and November. Of those, July has the fewest days with rain (0).

That is a measurement, not a recommendation: it counts the months whose normal afternoon high sits between 65°F and 85°F, where a light layer is enough by day.

When is the last frost in San Jose?

In San Jose, the last spring frost (32°F) comes after January 12 in half of years and after February 14 in one year in ten; the first autumn frost comes before December 22 in half of years and before December 1 in one year in ten. A night at 32°F or colder comes at all in 76% of years here (NOAA).

Last spring frost, half of years after

January 121 year in 10 after February 14; 9 in 10 after December 20

First autumn frost, half of years before

December 221 year in 10 before December 1; 9 in 10 before January 20

NOAA puts the median frost-free season at 347 days, and the season without a hard freeze (28°F) at 365 days.

A hard freeze (28°F) comes after December 31 in half of springs and before December 28 in half of autumns.

The USDA's 2023 Plant Hardiness Zone Map puts San Jose in zones 9b to 10a across its 31 ZIP code areas (9b in 95037, the largest). By the map's own method, the average of each year's coldest night over 1991-2020, San Jose's NOAA station is in zone 10a: the coldest night of a typical year reaches 31°F (22 complete years); the map interpolates between stations and terrain, so the station and the ZIP area can differ by half a zone.

Frost dates for every NOAA station in California · Frost dates by ZIP code

What hardiness zone is each San Jose ZIP code in?

The USDA's 2023 map gives each ZIP code area one zone. San Jose's 31 ZIP code areas run from zone 9b to 10a: 4 in 10a and 27 in 9b. Each ZIP's frost dates are in the frost tool.

How hot and how cold does it get in San Jose?

In a normal year in San Jose, 16 days a year reach 90°F (1 of them 100°F or more), 3 nights fall to 32°F or colder and 59 days bring measurable precipitation.

Days at 90°F or more

16a normal year

Days at 100°F or more

1a normal year

Nights at 32°F or colder

3a normal year

Days that stay below freezing

fewer than 1high of 32°F or less

Days with 0.01 inch of precipitation

59a normal year

The highest temperature in San Jose's official record (kept by the National Weather Service since 1893) is 109°F, on September 6, 2022; the lowest is 18°F, on January 6, 1894.

The wettest calendar year on that record is 1911, with 24.42 in; the snowiest season is 1932–33, with 1.0 inches.

How sunny is San Jose?

Over a year 89% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around San Jose, 5.3 kWh per square metre a day. July is the sunniest month (97%) and January the cloudiest (74%). Among the 459 U.S. places of 50,000 or more, that ranks tied 39th (with 12 others) in sunshine.

How much heating and cooling does San Jose need?

A normal year in San Jose brings 2,184 heating degree days, 59% fewer than the median U.S. place (5,373), and 624 cooling degree days, 31% fewer than the median (908). Three months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 4,040 growing degree days a year above 50°F.

Has San Jose been warmer than normal lately?

2025 averaged 61.2°F, 0.5°F above the 1991-2020 normal of 60.7°F. 5 of the 5 complete years since 2021 ran warmer than the normal.

Over 92 complete years from 1875 to 2025, the station's annual mean temperature rose at a fitted 3.2°F per century (+0.18°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.

Which places near San Jose share this climate record?

6 places have no NOAA station with 1991-2020 normals of their own, and this station is the nearest full record. A place's own climate can differ from these figures, by several degrees where it sits much higher or lower than the station, nearer the coast, or inside a large city's heat; for the larger places the next nearest records are named with their yearly mean, so the spread around them is visible, and places of 50,000 or more have their own page with NOAA's gridded normals.

• Santa Clara, CAalso near: Sunnyvale (5 mi, 59.9°F a year); Los Gatos (9 mi, 59.7°F a year)133,132 people · 2 mi W
• Milpitas, CAalso near: Sunnyvale (9 mi, 59.9°F a year); Newark (10 mi, 59.9°F a year)79,746 people · 5 mi N
• Alum Rock, CA11,619 people · 6 mi E
• East Foothills, CA8,630 people · 6 mi E
• Burbank, CA5,552 people · 3 mi S
• Fruitdale, CA1,203 people · 3 mi S

What do San Jose's other NOAA stations record?

One more NOAA station keeps 1991-2020 normals in or near San Jose. This page uses San Jose; the other differs by site and elevation:

Nearby and next

• San Jose in OctoberThis month day by day, its records and recent years
• California climateThe statewide normals and every place in the state
• Sunnyvale, CA7 miles from this station, 59.9°F a year
• Los Gatos, CA9 miles from this station, 59.7°F a year
• Newark, CA12 miles from this station, 59.9°F a year
• Palo Alto, CA13 miles from this station, 58.5°F a year
• Compare two placesMonth by month, side by side

Download these normals (CSV) · JSON · How these figures are made