Los Altos in Winter
In winter (December, January and February), Los Altos sees average daytime highs around 58°F and overnight lows near 44°F, with 10.6 in of rain over about 27 wet days across the season. It is the coldest season of the year and the wettest season of the year.
Across winter, daytime highs hold fairly steady around 58°F. The sky is clear or mostly clear about 35% of the time across winter, and the air most often feels dry.
Winter is Los Altos's weakest season of the year to visit on our travel score. For the whole year in context, see Los Altos's year-round climate.
- Avg daytime high
- 58°F
- coldest season of the year
- Avg overnight low
- 44°F
- Rainfall
- 10.6 in
- 27 wet days
- Avg wind
- 4 mph
- Travel score
- 4.4
- weakest season of the year
- Months
- Dec · Jan · Feb
Temperature in Los Altos in Winter
Across winter, daytime highs hold fairly steady around 58°F.
A typical winter day in Los Altos reaches about 58°F and drops to 44°F overnight. The warmest of the three months is February, the coolest January.
Los Altos weather by month
How the three winter months (December, January and February) compare with the rest of the year — the season's months are highlighted.
| Month | High / Low (°F) | Rainfall (inches) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 57° / 43° | 3.6 | 8.9 | 9.7 | 4.2 |
| Feb | 59° / 45° | 3.8 | 8.9 | 10.6 | 4.7 |
| Mar | 62° / 47° | 2.9 | 9.1 | 11.7 | 5.6 |
| Apr | 65° / 48° | 1.6 | 5.7 | 12.9 | 6.8 |
| May | 70° / 52° | 0.8 | 3.4 | 14 | 7.9 |
| Jun | 76° / 55° | 0.2 | 0.9 | 14.5 | 9.1 |
| Jul | 80° / 58° | 0.0 | 0.2 | 14.3 | 9.0 |
| Aug | 81° / 59° | 0.0 | 0.2 | 13.4 | 8.9 |
| Sep | 79° / 58° | 0.1 | 0.4 | 12.3 | 9.0 |
| Oct | 73° / 54° | 0.9 | 2.9 | 11 | 8.5 |
| Nov | 63° / 48° | 1.7 | 5.7 | 10 | 6.3 |
| Dec | 57° / 43° | 3.3 | 8.9 | 9.5 | 4.2 |
Cloud cover in Winter
The sky is clear or mostly clear about 35% of the time across winter.
Chance of precipitation in Winter
Los Altos gets around 10.6 in of rain over 27 wet days across winter. The line is the day-by-day chance of measurable precipitation.
Humidity in Winter
Most of winter feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Winter
Winds average 4 mph across winter.
Sunrise & sunset in Winter
Daylight runs from about 9 h 36 min in early December to 11 h 06 min by late February. The lit band spans sunrise to sunset each day.
Solar energy in Winter
Average shortwave solar energy reaching the ground each day across winter, about 2.7 kWh/m².
Is winter a good time to visit Los Altos?
Our two travel scores rate winter for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
winter is a reasonable time to visit Los Altos for sightseeing.
What to pack for Los Altos in Winter
From winter's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In winter, Los Altos sees daytime highs around 58°F and nights near 44°F. Worth packing: a warm layer and rain gear. About 27 days see rain.
Sea temperature near Los Altos in Winter
The nearest coast averages about 54°F across winter — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea at the nearest coast (about 14 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.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°F) | 54 | 54 | 54 | 54 | 54 | 55 | 57 | 59 | 59 | 58 | 56 | 55 |
| Comfort | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing |
| Sea temperature (°F) | Comfort | |
|---|---|---|
| Jan | 54 | Bracing |
| Feb | 54 | Bracing |
| Mar | 54 | Bracing |
| Apr | 54 | Bracing |
| May | 54 | Bracing |
| Jun | 55 | Bracing |
| Jul | 57 | Bracing |
| Aug | 59 | Bracing |
| Sep | 59 | Bracing |
| Oct | 58 | Bracing |
| Nov | 56 | Bracing |
| Dec | 55 | Bracing |
UV index in Los Altos in Winter
Clear-sky midday UV across winter averages around 3. The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Los Altos 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.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 3 | 4 | 5 | 7 | 8 | 10 | 10 | 10 | 6 | 5 | 2 | 2 |
| Level | Moderate | Moderate | Moderate | High | Very high | Extreme | Extreme | Very high | High | High | Moderate | Moderate |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 3 | Moderate |
| Feb | 4 | Moderate |
| Mar | 5 | Moderate |
| Apr | 7 | High |
| May | 8 | Very high |
| Jun | 10 | Extreme |
| Jul | 10 | Extreme |
| Aug | 10 | Very high |
| Sep | 6 | High |
| Oct | 5 | High |
| Nov | 2 | Moderate |
| Dec | 2 | Moderate |
Air quality in Los Altos in Winter
Average fine-particle pollution (PM2.5) through the year — so you can see where winter falls, not just the annual average.
Air quality in Los Altos 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).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 15 | 18 | 16 | 12 | 10 | 10 | 11 | 25 | 17 | 20 | 18 | 13 |
| Level | Moderate | Moderate | Moderate | Moderate | Good | Good | Good | Moderate | Moderate | Moderate | Moderate | Moderate |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 15 | Moderate |
| Feb | 18 | Moderate |
| Mar | 16 | Moderate |
| Apr | 12 | Moderate |
| May | 10 | Good |
| Jun | 10 | Good |
| Jul | 11 | Good |
| Aug | 25 | Moderate |
| Sep | 17 | Moderate |
| Oct | 20 | Moderate |
| Nov | 18 | Moderate |
| Dec | 13 | Moderate |
Where is Los Altos?
Los Altos sits at 37.4°N, 122.1°W, 157 ft above sea level, in United States. The nearest listed city is Mountain View, 1.9 mi away.
Topography around Los Altos
How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Los Altos.
Within 2 miles, the terrain around Los Altos has only modest variations in elevation — a maximum elevation change of 505 ft around an average of 177 ft above sea level; within 10 miles, large variations in elevation — a maximum elevation change of 3,002 ft; within 50 miles, very significant variations in elevation — a maximum elevation change of 4,452 ft.
The land around Los Altos is covered by artificial surfaces (48%) and trees (47%) within 2 miles, trees (43%) and artificial surfaces (28%) within 10 miles, and water (36%), trees (25%) and grassland (23%) within 50 miles.
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
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 Los Altos (37.3852°, -122.1141°, elevation 157 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.