San Mateo in Summer
In summer (June, July and August), San Mateo sees average daytime highs around 28°C and overnight lows near 20°C, with 376 mm of rain over about 65 wet days across the season. It is the 3rd-warmest season and the 3rd-wettest season.
Across summer, daytime highs hold fairly steady around 28°C. The sky is clear or mostly clear about 6% of the time across summer, and the air most often feels muggy.
Summer is San Mateo's 3rd-best season to visit on our travel score. For the whole year in context, see San Mateo's year-round climate.
- Avg daytime high
- 28°C
- 3rd-warmest season
- Avg overnight low
- 20°C
- Rainfall
- 376 mm
- 65 wet days
- Avg wind
- 5 km/h
- Travel score
- 4.2
- 3rd-best season
- Months
- Jun · Jul · Aug
Temperature in San Mateo in Summer
Across summer, daytime highs hold fairly steady around 28°C.
A typical summer day in San Mateo reaches about 28°C and drops to 20°C overnight. The warmest of the three months is June, the coolest July.
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 (°C) | Rainfall (mm) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 27° / 18° | 75 | 19.6 | 11.5 | 5.2 |
| Feb | 28° / 19° | 64 | 15.9 | 11.7 | 5.3 |
| Mar | 28° / 19° | 104 | 18.1 | 11.9 | 4.8 |
| Apr | 28° / 20° | 171 | 22.4 | 12.2 | 3.9 |
| May | 29° / 21° | 161 | 21.1 | 12.5 | 3.9 |
| Jun | 28° / 20° | 116 | 20.7 | 12.6 | 4.1 |
| Jul | 28° / 20° | 133 | 22.8 | 12.5 | 4.3 |
| Aug | 28° / 20° | 127 | 21.6 | 12.3 | 4.2 |
| Sep | 29° / 20° | 115 | 19.2 | 12.1 | 4.1 |
| Oct | 29° / 20° | 140 | 21.4 | 11.8 | 4.0 |
| Nov | 28° / 20° | 167 | 23.7 | 11.5 | 4.1 |
| Dec | 27° / 19° | 96 | 20.6 | 11.4 | 4.9 |
Cloud cover in Summer
The sky is clear or mostly clear about 6% of the time across summer.
Chance of precipitation in Summer
San Mateo gets around 376 mm of rain over 65 wet days across summer. The line is the day-by-day chance of measurable precipitation.
Humidity in Summer
Most of summer feels muggy — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Summer
Winds average 5 km/h across summer.
Sunrise & sunset in Summer
Daylight runs from about 12 h 36 min in early June to 12 h 12 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 5.2 kWh/m².
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 a reasonable time to visit San Mateo for sightseeing.
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 28°C and nights near 20°C. Pack light clothes and rain gear. Worth having: sun protection. About 65 days see rain.
Sea temperature near San Mateo in Summer
The nearest coast averages about 27°C 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 46 km away) is warmest in September at about 29°C and coldest in February near 26°C.
The water stays above 20°C all year — warm enough for a swim any month.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 26 | 26 | 26 | 26 | 27 | 27 | 27 | 28 | 29 | 29 | 28 | 27 |
| Comfort | Warm | Warm | Warm | Warm | Warm | Warm | Warm | Tropical | Tropical | Tropical | Tropical | Warm |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 26 | Warm |
| Feb | 26 | Warm |
| Mar | 26 | Warm |
| Apr | 26 | Warm |
| May | 27 | Warm |
| Jun | 27 | Warm |
| Jul | 27 | Warm |
| Aug | 28 | Tropical |
| Sep | 29 | Tropical |
| Oct | 29 | Tropical |
| Nov | 28 | Tropical |
| Dec | 27 | Warm |
UV index in San Mateo in Summer
Clear-sky midday UV across summer averages around 12 (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 March 18 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 10 at about 9 (very high).
The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 11 | 13 | 14 | 13 | 12 | 12 | 12 | 12 | 13 | 12 | 9 | 9 |
| Level | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Very high | Very high |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 11 | Extreme |
| Feb | 13 | Extreme |
| Mar | 14 | Extreme |
| Apr | 13 | Extreme |
| May | 12 | Extreme |
| Jun | 12 | Extreme |
| Jul | 12 | Extreme |
| Aug | 12 | Extreme |
| Sep | 13 | Extreme |
| Oct | 12 | Extreme |
| Nov | 9 | Very high |
| Dec | 9 | Very high |
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 June — around 32 µg/m³ PM2.5 (moderate), about 2.4× the cleanest month (December, 13 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) | 13 | 16 | 19 | 26 | 31 | 32 | 27 | 24 | 21 | 20 | 16 | 13 |
| Level | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 13 | Moderate |
| Feb | 16 | Moderate |
| Mar | 19 | Moderate |
| Apr | 26 | Moderate |
| May | 31 | Moderate |
| Jun | 32 | Moderate |
| Jul | 27 | Moderate |
| Aug | 24 | Moderate |
| Sep | 21 | Moderate |
| Oct | 20 | Moderate |
| Nov | 16 | Moderate |
| Dec | 13 | Moderate |
Where is San Mateo?
San Mateo sits at 10.2°N, 67.4°W, 497 m above sea level, in Venezuela. The nearest listed city is Cagua, 5.0 km away.
Topography around San Mateo
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of San Mateo.
Within 3 km, the terrain around San Mateo has significant variations in elevation — a maximum elevation change of 560 m around an average of 580 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,633 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,728 m.
The land around San Mateo is covered by trees (33%) and shrubs (26%) within 3 km, trees (34%), grassland (27%) and shrubs (21%) within 16 km, and trees (45%) and water (23%) within 80 km.
Venezuela travel facts
- Travel advisory
- Level 3
- Reconsider Travel
- Power plugs
- Type A / B
- 120 V · 60 Hz
- Prices
- ≈ 0% of US
- price level, 2011
- GDP per capita
- $3,495
- 2025
- Happiness
- 5.8 / 10
- World Happiness, 2025
- Homicide rate
- 12.6
- per 100k, 2022
- Road deaths
- 39
- per 100k/yr, 2019
- Income group
- Lower middle
- World Bank
- English
- Moderate
- EF EPI 520
- 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 (10.213°, -67.4236°, elevation 497 m), 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.