San Carlos in Winter
In winter (December, January and February), San Carlos sees average daytime highs around 58°F and overnight lows near 46°F, with 11.8 in of rain over about 28 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 32% of the time across winter, and the air most often feels dry.
Winter is San Carlos's weakest season of the year to visit on our travel score. For the whole year in context, see San Carlos's year-round climate.
- Avg daytime high
- 58°F
- coldest season of the year
- Avg overnight low
- 46°F
- Rainfall
- 11.8 in
- 28 wet days
- Avg wind
- 5 mph
- Travel score
- 4.2
- weakest season of the year
- Months
- Dec · Jan · Feb
Temperature in San Carlos in Winter
Across winter, daytime highs hold fairly steady around 58°F.
A typical winter day in San Carlos reaches about 58°F and drops to 46°F overnight. The warmest of the three months is February, the coolest January.
San Carlos 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° / 45° | 3.9 | 9.4 | 9.7 | 4.1 |
| Feb | 59° / 47° | 4.2 | 9.3 | 10.6 | 4.5 |
| Mar | 61° / 48° | 3.2 | 9.1 | 11.7 | 5.3 |
| Apr | 63° / 49° | 1.6 | 5.6 | 12.9 | 6.4 |
| May | 66° / 52° | 0.8 | 3.3 | 14 | 7.4 |
| Jun | 70° / 54° | 0.2 | 0.9 | 14.5 | 8.5 |
| Jul | 73° / 56° | 0.0 | 0.2 | 14.3 | 9.1 |
| Aug | 74° / 57° | 0.0 | 0.1 | 13.4 | 9.2 |
| Sep | 74° / 57° | 0.1 | 0.4 | 12.3 | 9.2 |
| Oct | 71° / 54° | 0.9 | 3 | 11 | 8.2 |
| Nov | 63° / 49° | 2.0 | 6 | 10 | 6.1 |
| Dec | 57° / 46° | 3.7 | 9.3 | 9.5 | 4.1 |
Cloud cover in Winter
The sky is clear or mostly clear about 32% of the time across winter.
Chance of precipitation in Winter
San Carlos gets around 11.8 in of rain over 28 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 5 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.
Hazard calendar for San Carlos
In winter, San Carlos overlaps its rainy season season. The full year is below, with each hazard's peak months called out.
San Carlos's rainy season runs November–March, when most of the year's rain falls.
Is winter a good time to visit San Carlos?
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 San Carlos for sightseeing.
What to pack for San Carlos in Winter
From winter's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In winter, San Carlos sees daytime highs around 58°F and nights near 46°F. Worth packing: a warm layer and rain gear. About 28 days see rain.
Sea temperature near San Carlos 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 11 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 San Carlos 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 San Carlos 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) | 2 | 4 | 5 | 6 | 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 | 2 | Moderate |
| Feb | 4 | Moderate |
| Mar | 5 | Moderate |
| Apr | 6 | 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 San Carlos 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 San Carlos 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 San Carlos?
San Carlos sits at 37.5°N, 122.3°W, 33 ft above sea level, in United States. The nearest listed city is Belmont, 1.2 mi away.
Topography around San Carlos
How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of San Carlos.
Within 2 miles, the terrain around San Carlos has significant variations in elevation — a maximum elevation change of 902 ft around an average of 121 ft above sea level; within 10 miles, large variations in elevation — a maximum elevation change of 2,454 ft; within 50 miles, very significant variations in elevation — a maximum elevation change of 4,452 ft.
The land around San Carlos is covered by artificial surfaces (50%) and trees (27%) within 2 miles, trees (39%) and water (33%) within 10 miles, and water (40%), trees (24%) and grassland (21%) 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 San Carlos (37.5072°, -122.2605°, elevation 33 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.