Cupertino weather in January

In January, Cupertino sees average daytime highs of 57°F and overnight lows near 42°F, with 5.1 in of rain across 9.1 wet days and about 9.7 hours of daylight. It is the 11th-warmest and 2nd-wettest month of the year here.

Day-to-day highs hold fairly steady near 57°F through the month. The sky is clear or mostly clear about 34% of the time in January, and the air most often feels dry.

Daylight stretches from about 9 h 30 min at the start of January to 10 h 06 min by month's end. Set against the rest of the year, January is Cupertino's 12th-clearest and 7th-windiest month. For the whole year in context, see Cupertino's year-round climate.

Daytime high
57°
11th warmest
Overnight low
42°
2nd coldest
Rainfall
5.1 in
9.1 wet days
Daylight
9 h 42 min
7:27 AM – 5:08 PM
Cloud cover
58%
12th clearest
Wind
4 mph
7th windiest
Solar energy
2.54 kWh/m²
Travel score
4.2
out of 10

Cupertino is city in Santa Clara County, California, United States.

Density
2,078/km²
people per km²
Founded
1947

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in January

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 57°F through the month.

A typical January day in Cupertino reaches about 57°F in the afternoon and slips back to 42°F overnight — a 15°F spread between the day's warmth and the night's chill. On most days the high lands between 51°F and 65°F. Set against its neighbours, January runs on par with December and about 2°F cooler than February.

30°40°50°60°70°151015202531
Avg high (°F)Avg low (°F)
15642
25642
35642
45642
55642
65642
75742
85742
95742
105742
115742
125742
135742
145742
155742
165742
175742
185742
195743
205743
215843
225843
235843
245843
255843
265843
275843
285843
295843
305843
315943

Cupertino weather by month

How January compares with the rest of the year at a glance. January is the 11th-warmest and 2nd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysDaylight (hours)Travel score
Jan57° / 42°5.19.19.74.2
Feb59° / 44°5.39.310.64.6
Mar62° / 45°3.99.311.75.4
Apr65° / 47°1.85.612.96.7
May69° / 50°0.93.4147.8
Jun74° / 53°0.2114.59.1
Jul78° / 56°0.00.114.39.4
Aug78° / 56°0.00.213.49.2
Sep78° / 56°0.10.512.39.2
Oct73° / 52°1.23118.5
Nov63° / 46°2.46106.2
Dec57° / 42°4.79.29.54.2

Cloud cover in January

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 34% of the time in January, the cloudiest month of the year.

Beyond those clear spells, partly cloudy skies cover about 12% of January, with mostly cloudy or overcast conditions the remaining 55%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14555
24456
34456
44357
54456
64357
74357
84357
94555
104555
114555
124555
134555
144555
154555
164555
174555
184753
194654
204555
214654
224654
234654
244753
254654
264654
274753
284753
294753
304852
314852

Chance of precipitation in January

Any precipitation

Cupertino gets around 5.1 in of rain over 9.1 wet days in January. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 29% and peaks near 32% on the wettest days.

0%10%20%30%40%151015202531
Rain chance (%)
128
228
328
428
528
628
727
827
927
1027
1128
1228
1328
1429
1529
1630
1731
1831
1932
2032
2132
2232
2332
2432
2531
2631
2731
2830
2930
3029
3129

Humidity in January

DryComfortableHumidMuggyOppressiveMiserable

Most of January feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, January lands in the dry band about 99% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)
1982
2982
3982
4982
5982
6991
7991
8991
9991
10991
11991
12991
13991
141000
151000
161000
171000
181000
191000
201000
211000
221000
231000
241000
251000
26991
27991
28991
29991
30991
31991

Wind in January

Winds average 4 mph in January.

Across January, daily wind ranges from about 4 mph on the calmest days to 5 mph at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (mph)Feels
15calm
25calm
35calm
45calm
54calm
64calm
74calm
84calm
94calm
104calm
114calm
124calm
134calm
144calm
154calm
164calm
174calm
184calm
194calm
204calm
214calm
224calm
234calm
244calm
254calm
264calm
274calm
284calm
294calm
304calm
314calm

Sunrise & sunset in January

DaylightNight

Daylight runs from about 9 h 30 min at the start of January to 10 h 06 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 36 minutes over January. Sunrise moves from 7:27 AM to 7:19 AM, and sunset from 4:55 PM to 5:24 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
19.57:274:55
29.57:274:56
39.57:274:57
49.57:284:58
59.57:284:58
69.57:284:59
79.57:285:00
89.67:285:01
99.67:285:02
109.67:285:03
119.67:285:04
129.67:275:04
139.67:275:05
149.77:275:06
159.77:275:07
169.77:275:08
179.77:265:09
189.77:265:10
199.87:265:11
209.87:255:12
219.87:255:13
229.87:245:14
239.97:245:15
249.97:235:16
259.97:235:17
269.97:225:18
2710.07:225:19
2810.07:215:21
2910.07:215:22
3010.07:205:23
3110.17:195:24

Solar energy in January

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in January, about 2.54 kWh/m².

For context, solar energy here swings from a low near 2.34 kWh/m² to a high of 7.85 kWh/m² in June across the year — January's 2.54 kWh/m² sits near the bottom.

0123151015202531
Solar energy (kWh/m²)Level
12.4Moderate
22.4Moderate
32.4Moderate
42.4Moderate
52.4Moderate
62.4Moderate
72.4Moderate
82.4Moderate
92.4Moderate
102.4Moderate
112.5Moderate
122.5Moderate
132.5Moderate
142.5Moderate
152.5Moderate
162.5Moderate
172.6Moderate
182.6Moderate
192.6Moderate
202.6Moderate
212.7Moderate
222.7Moderate
232.7Moderate
242.8Moderate
252.8Moderate
262.8Moderate
272.8Moderate
282.9Moderate
292.9Moderate
302.9Moderate
313.0Moderate
Planning a trip in January

Hazard calendar for Cupertino

In seasonPeak

In January, Cupertino sits inside its rainy season season. The full year is below, with each hazard's peak months called out.

Cupertino's rainy season runs November–March, when most of the year's rain falls.

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

Is January a good time to visit Cupertino?

Our two travel scores rate January for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

4.2
Sightseeing
11th-best month of the year
0.0
Beach & pool
12th-best month of the year

January is a reasonable time to visit Cupertino for sightseeing.

What to pack for Cupertino in January

From January's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In January, Cupertino sees daytime highs around 57°F and nights near 42°F. Worth packing: a warm layer and rain gear. About 9 days see rain.

a warm layerrain gear

Sea temperature near Cupertino in January

The nearest coast averages about 54°F in January — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 19 mi away) is warmest in August at about 59°F and coldest in April near 54°F.

The water stays below 68°F all year — cool enough that most swimmers want a wetsuit.

52°54°56°58°60°JanFebMarAprMayJunJulAugSepOctNovDecbracingcool
Sea temperature (°F)Comfort
Jan54Bracing
Feb54Bracing
Mar54Bracing
Apr54Bracing
May54Bracing
Jun55Bracing
Jul57Bracing
Aug59Bracing
Sep59Bracing
Oct58Bracing
Nov56Bracing
Dec55Bracing

UV index in Cupertino in January

LowModerateHighVery highExtreme

Clear-sky midday UV in January peaks around 3. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Cupertino peaks around June 23 at about 10 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 15 at about 2 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 9 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highExtremeVery highHighModerateJun 23UV 10Dec 15UV 2
UV index (midday)Level
Jan3Moderate
Feb4Moderate
Mar5Moderate
Apr7High
May8Very high
Jun10Extreme
Jul10Extreme
Aug10Very high
Sep6High
Oct5High
Nov2Moderate
Dec2Moderate

Air quality in Cupertino in January

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where January falls, not just the annual average.

Air quality in Cupertino is worst in August — around 25 µg/m³ PM2.5 (moderate), about 2.5× the cleanest month (June, 10 µg/m³).

Modeled monthly averages (CAMS reanalysis, 2015–2024).

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodModerateAug 1824 µg/m³Jun 1110 µg/m³
PM2.5 (µg/m³)Level
Jan15Moderate
Feb18Moderate
Mar16Moderate
Apr12Moderate
May10Good
Jun10Good
Jul11Good
Aug25Moderate
Sep17Moderate
Oct20Moderate
Nov18Moderate
Dec13Moderate
Location & terrain

Where is Cupertino?

Cupertino sits at 37.3°N, 122.0°W, 236 ft above sea level, in United States. The nearest listed city is Sunnyvale, 3.1 mi away.

Topography around Cupertino

How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Cupertino.

Within 2 miles, the terrain around Cupertino has only modest variations in elevation — a maximum elevation change of 469 ft around an average of 253 ft above sea level; within 10 miles, large variations in elevation — a maximum elevation change of 3,297 ft; within 50 miles, very significant variations in elevation — a maximum elevation change of 4,373 ft.

The land around Cupertino is covered by artificial surfaces (81%) within 2 miles, trees (44%) and artificial surfaces (41%) within 10 miles, and water (32%), grassland (26%) and trees (25%) within 50 miles.

2 miles
469 ft
10 miles
3,297 ft
50 miles
4,373 ft
treesgrasslandcroplandartificial surfacesbare terrainwaterwetland
January weather nearby: Sunnyvale 3.1 mi · Saratoga 4.3 mi · Santa Clara 5.0 mi · Campbell 5.0 mi · Mountain View 5.0 mi · Los Altos 6.2 mi · Los Gatos 7.5 mi · San Jose 7.5 mi

United States travel facts

Power plugs
Type A / B
120 V · 60 Hz
Prices
≈ 100% of US
price level, 2025
GDP per capita
$90,027
2025
Happiness
6.8 / 10
World Happiness, 2025
Safe drinking water
98%
of population, 2024
Homicide rate
5.8
per 100k, 2023
Road deaths
12.7
per 100k/yr, 2019
Income group
High
World Bank
Religion
Protestant 47%unaffiliated 23%Roman Catholic 21%Jewish 2%

Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.

Data sources

Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Cupertino (37.323°, -122.0322°, elevation 236 ft), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).