San Mateo in Summer
In summer (June, July and August), San Mateo sees average daytime highs around 72°F and overnight lows near 56°F, with 0.2 in of rain over about 1 wet days across the season. It is the warmest season of the year and the driest season of the year.
Over the season highs climb from about 68°F in early June to 74°F by late August. The sky is clear or mostly clear about 77% of the time across summer, and the air most often feels dry.
Summer is San Mateo's best season of the year to visit on our travel score. For the whole year in context, see San Mateo's year-round climate.
- Avg daytime high
- 72°F
- warmest season of the year
- Avg overnight low
- 56°F
- Rainfall
- 0.2 in
- 1 wet days
- Avg wind
- 5 mph
- Travel score
- 8.9
- best season of the year
- Months
- Jun · Jul · Aug
Temperature in San Mateo in Summer
Over the season highs climb from about 68°F in early June to 74°F by late August.
A typical summer day in San Mateo reaches about 72°F and drops to 56°F overnight. The warmest of the three months is August, the coolest June.
San Mateo weather by month
How the three summer months (June, July and August) 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 Summer
The sky is clear or mostly clear about 77% of the time across summer.
Chance of precipitation in Summer
San Mateo gets around 0.2 in of rain over 1 wet days across summer. The line is the day-by-day chance of measurable precipitation.
Humidity in Summer
Most of summer feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Summer
Winds average 5 mph across summer.
Sunrise & sunset in Summer
Daylight runs from about 14 h 24 min in early June to 12 h 54 min by late August. The lit band spans sunrise to sunset each day.
Solar energy in Summer
Average shortwave solar energy reaching the ground each day across summer, about 7.4 kWh/m².
Hazard calendar for San Mateo
None of San Mateo's seasonal hazards peak in summer. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do.
San Mateo's rainy season runs November–March, when most of the year's rain falls.
Is summer a good time to visit San Mateo?
Our two travel scores rate summer for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
summer is one of the better times to visit San Mateo for general sightseeing. The water and warmth also suit a beach or pool day.
What to pack for San Mateo in Summer
From summer's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In summer, San Mateo sees daytime highs around 72°F and nights near 56°F. Pack sun protection. Worth having: light clothes.
Sea temperature near San Mateo in Summer
The nearest coast averages about 57°F across summer — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea at the nearest coast (about 13 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 Mateo in Summer
Clear-sky midday UV across summer averages around 10 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in San Mateo 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 Mateo in Summer
Average fine-particle pollution (PM2.5) through the year — so you can see where summer falls, not just the annual average.
Air quality in San Mateo 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 Mateo?
San Mateo sits at 37.6°N, 122.3°W, 43 ft above sea level, in United States. The nearest listed city is Burlingame, 2.5 mi away.
Topography around San Mateo
How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of San Mateo.
Within 2 miles, the terrain around San Mateo has only modest variations in elevation — a maximum elevation change of 643 ft around an average of 92 ft above sea level; within 10 miles, large variations in elevation — a maximum elevation change of 2,457 ft; within 50 miles, very significant variations in elevation — a maximum elevation change of 4,452 ft.
The land around San Mateo is covered by artificial surfaces (53%) and trees (31%) within 2 miles, water (39%) and trees (34%) within 10 miles, and water (40%), trees (23%) 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 Mateo (37.563°, -122.3255°, elevation 43 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.