Cupertino, California climate: NOAA's gridded normals for the city, beside the nearest station records
NOAA's gridded 1991-2020 normals put Cupertino's center at January lows of 39°F and July highs of 83°F, a yearly mean of 59.1°F and 23.8 inches of precipitation. No NOAA station keeps a record under the city's name. The nearest station record, Sunnyvale (6 miles N, 39 ft), has January lows of 42°F and July highs of 77°F.
58,710 people (Census Bureau 2024). Distances and directions are from the city's center.
- Jan 60° 39°
- Feb 62° 41°
- Mar 66° 43°
- Apr 69° 44°
- May 74° 48°
- Jun 80° 51°
- Jul 83° 54°
- Aug 83° 54°
- Sep 82° 53°
- Oct 77° 48°
- Nov 66° 42°
- Dec 59° 39°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
The months above are NOAA's gridded normals at Cupertino's center.
What is each month like in Cupertino?
NOAA's grid estimates the normals every 5 km or so from the stations around each point, terrain included. It smooths between stations, so night lows at the heart of a large city can run warmer than the grid shows: at five big-city airports we compared, the grid's highs were within about 1°F of the station and its lows 1-6°F cooler. The nearest record's high and low are beside each month.
| Month | High | Low | Mean | Precip. | Sunnyvale high | Sunnyvale low |
|---|---|---|---|---|---|---|
| January | 60°F | 39°F | 49.5°F | 4.75 | 59°F | 42°F |
| February | 62°F | 41°F | 51.8°F | 4.77 | 62°F | 45°F |
| March | 66°F | 43°F | 54.4°F | 3.68 | 65°F | 47°F |
| April | 69°F | 44°F | 56.9°F | 1.65 | 68°F | 49°F |
| May | 74°F | 48°F | 61.2°F | 0.72 | 72°F | 53°F |
| June | 80°F | 51°F | 65.7°F | 0.16 | 76°F | 56°F |
| July | 83°F | 54°F | 68.6°F | 0.01 | 77°F | 59°F |
| August | 83°F | 54°F | 68.7°F | 0.02 | 77°F | 59°F |
| September | 82°F | 53°F | 67.4°F | 0.08 | 78°F | 57°F |
| October | 77°F | 48°F | 62.4°F | 0.96 | 74°F | 53°F |
| November | 66°F | 42°F | 54.1°F | 2.34 | 66°F | 46°F |
| December | 59°F | 39°F | 49.1°F | 4.69 | 59°F | 42°F |
In metric: a yearly mean of 15.1°C, January lows of 4°C, July highs of 28°C and 606 mm of precipitation a year.
Source: NOAA NCEI U.S. Monthly Gridded Climate Normals 1991-2020 (nClimGrid, accession 0245564); NOAA NCEI 1991-2020 station normals. The grid cell holding the city's Census center point.
What do the station records around Cupertino say?
Each row is a NOAA station's own 1991-2020 normals, with the snow and frost dates the grid does not give. A record downhill or nearer the coast than the city can run warmer, one uphill cooler: compare the elevations.
| Record | Where | Elevation | Year | Jan low | Jul high | Precip. | Snow | Last frost |
|---|---|---|---|---|---|---|---|---|
| SunnyvaleMoffett Federal Airfield | 6 mi N | 39 ft | 59.9°F | 42°F | 77°F | 13.4 | – | January 6 |
| San Jose | 7 mi NE | 51 ft | 60.7°F | 42°F | 81°F | 13.5 | – | January 12 |
| Los Gatos | 8 mi SE | 365 ft | 59.7°F | 40°F | 85°F | 22.2 | 0 | February 2 |
Source: NOAA NCEI 1991-2020 U.S. Climate Normals; place center and population: Census Bureau 2024. Last frost: the median last spring date of 32°F.
How much snow, how late a frost, what zone and how much sun in Cupertino?
NOAA's grid gives no snow, frost dates or records, so these come from the nearest station record, Sunnyvale (6 miles N, 39 ft). NOAA publishes no snowfall normal for it; the nearest record that has one, Los Gatos (8 miles SE), gets 0 inches a year. The last spring frost (32°F) comes after January 6 in half of years and the first autumn frost before December 23. Its record high is 106°F (2000) and its record low 21°F (1949) (kept since 1945).
The USDA's 2023 Plant Hardiness Zone Map puts Cupertino in zone 9b (ZIP code 95014).
Over a year 80% of the sunlight that would reach the ground under clear skies gets through the clouds in the area (4.7 kWh per square metre a day, NASA POWER 2001-2020); June is the sunniest month (84%) and December the cloudiest (74%).
Sunnyvale's page has its months, frost probabilities, records by month and recent years. NOAA's grid has monthly figures only, so there are no day-by-day month pages for Cupertino; the nearest record's month pages have them.
Source: NOAA NCEI 1991-2020 normals, station USW00023244; records: ACIS; USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026; sunshine: NASA POWER.
How does the climate vary across Cupertino, ZIP code by ZIP code?
One ZIP code area lies wholly or partly in Cupertino. Each row also names the nearest station record and its frost dates.
| ZIP code | Zone | Year | Jan low | Jul high | Precip. | Nearest record | Last frost | First frost |
|---|---|---|---|---|---|---|---|---|
| 95014 | 9b | 59.1°F | 39°F | 83°F | 23.8 | Skyline Ridge Preserve (6 mi) | March 21 | December 15 |
Source: Census Bureau 2020 ZCTA-to-place relationship file and ZCTA centers; NOAA NCEI gridded and station normals, 1991-2020. A ZIP area counts when at least a tenth of its land (and 0.5 km²) is in the city; its figures are the grid cell at its center; frost dates are the nearest record's medians of 32°F.