San Isidro in Summer
In summer (June, July and August), San Isidro sees average daytime highs around 21°C and overnight lows near 11°C, with 925 mm of rain over about 74 wet days across the season. It is the 2nd-warmest season and the wettest season of the year.
Over the season highs ease from about 23°C in early June to 20°C by late August. The sky is clear or mostly clear about 6% of the time across summer, and the air most often feels dry.
Summer is San Isidro's weakest season of the year to visit on our travel score. For the whole year in context, see San Isidro's year-round climate.
- Avg daytime high
- 21°C
- 2nd-warmest season
- Avg overnight low
- 11°C
- Rainfall
- 925 mm
- 74 wet days
- Avg wind
- 4 km/h
- Travel score
- 4.2
- weakest season of the year
- Months
- Jun · Jul · Aug
Temperature in San Isidro in Summer
Over the season highs ease from about 23°C in early June to 20°C by late August.
A typical summer day in San Isidro reaches about 21°C and drops to 11°C overnight. The warmest of the three months is June, the coolest July.
San Isidro 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 | 19° / 5° | 19 | 3.4 | 11 | 7.3 |
| Feb | 20° / 6° | 17 | 3.5 | 11.3 | 7.8 |
| Mar | 22° / 8° | 22 | 5.2 | 11.9 | 7.8 |
| Apr | 23° / 9° | 40 | 6.9 | 12.4 | 7.5 |
| May | 23° / 10° | 79 | 12.5 | 12.9 | 6.6 |
| Jun | 22° / 11° | 243 | 20.1 | 13.1 | 4.9 |
| Jul | 20° / 10° | 345 | 27 | 13 | 3.8 |
| Aug | 20° / 10° | 337 | 26.5 | 12.7 | 3.8 |
| Sep | 20° / 11° | 273 | 23.6 | 12.1 | 4.1 |
| Oct | 20° / 9° | 120 | 14 | 11.6 | 5.6 |
| Nov | 19° / 6° | 35 | 5.7 | 11.1 | 7.0 |
| Dec | 19° / 5° | 12 | 2.2 | 10.9 | 7.5 |
Cloud cover in Summer
The sky is clear or mostly clear about 6% of the time across summer.
Chance of precipitation in Summer
San Isidro gets around 925 mm of rain over 74 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 4 km/h across summer.
Sunrise & sunset in Summer
Daylight runs from about 13 h 06 min in early June to 12 h 24 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 5.9 kWh/m².
Hazard calendar for San Isidro
In summer, San Isidro overlaps its monsoon season. The full year is below, with each hazard's peak months called out.
San Isidro's monsoon runs June–September, when most of the year's rain falls.
Is summer a good time to visit San Isidro?
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 Isidro for sightseeing.
What to pack for San Isidro in Summer
From summer's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In summer, San Isidro sees daytime highs around 21°C and nights near 11°C. Pack rain gear. Worth having: sun protection. About 74 days see rain.
UV index in San Isidro in Summer
Clear-sky midday UV across summer averages around 13 (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 Isidro peaks around April 10 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 14 at about 8 (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) | 9 | 12 | 14 | 15 | 11 | 14 | 12 | 14 | 12 | 11 | 9 | 8 |
| Level | Very high | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Very high | Very high |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 9 | Very high |
| Feb | 12 | Extreme |
| Mar | 14 | Extreme |
| Apr | 15 | Extreme |
| May | 11 | Extreme |
| Jun | 14 | Extreme |
| Jul | 12 | Extreme |
| Aug | 14 | Extreme |
| Sep | 12 | Extreme |
| Oct | 11 | Extreme |
| Nov | 9 | Very high |
| Dec | 8 | Very high |
Air quality in San Isidro 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 Isidro is worst in December — around 179 µg/m³ PM2.5 (very unhealthy), and holds fairly steady the rest of the year.
Modeled monthly averages (CAMS reanalysis, 2015–2024).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 149 | 141 | 126 | 113 | 134 | 126 | 135 | 127 | 136 | 137 | 174 | 179 |
| Level | Unhealthy | Unhealthy | Unhealthy | Unhealthy | Unhealthy | Unhealthy | Unhealthy | Unhealthy | Unhealthy | Unhealthy | Very unhealthy | Very unhealthy |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 149 | Unhealthy |
| Feb | 141 | Unhealthy |
| Mar | 126 | Unhealthy |
| Apr | 113 | Unhealthy |
| May | 134 | Unhealthy |
| Jun | 126 | Unhealthy |
| Jul | 135 | Unhealthy |
| Aug | 127 | Unhealthy |
| Sep | 136 | Unhealthy |
| Oct | 137 | Unhealthy |
| Nov | 174 | Very unhealthy |
| Dec | 179 | Very unhealthy |
Where is San Isidro?
San Isidro sits at 19.3°N, 99.0°W, 2,259 m above sea level, in Mexico. The nearest listed city is Emiliano Zapata, 3.0 km away.
Topography around San Isidro
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of San Isidro.
Within 3 km, the terrain around San Isidro has significant variations in elevation — a maximum elevation change of 473 m around an average of 2,316 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 550 m; within 80 km, extreme variations in elevation — a maximum elevation change of 4,473 m.
The land around San Isidro is covered by artificial surfaces (69%) within 3 km, artificial surfaces (50%) within 16 km, and trees (32%) and cropland (29%) within 80 km.
Mexico travel facts
- Travel advisory
- Level 2
- Exercise Increased Caution
- Power plugs
- Type A / B
- 120 / 127 V · 60 Hz
- Prices
- ≈ 54% of US
- price level, 2025
- GDP per capita
- $13,889
- 2025
- Happiness
- 7.0 / 10
- World Happiness, 2025
- Safe drinking water
- 43%
- of population, 2024
- Homicide rate
- 24.9
- per 100k, 2023
- Road deaths
- 12.8
- per 100k/yr, 2019
- Income group
- Upper middle
- World Bank
- English
- Very low
- EF EPI 440
- 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 Isidro (19.3397°, -98.9506°, elevation 2,259 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.