San Sebastián el Grande in Summer
In summer (June, July and August), San Sebastián el Grande sees average daytime highs around 28°C and overnight lows near 17°C, with 449 mm of rain over about 67 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 32°C in early June to 27°C by late August. The sky is clear or mostly clear about 15% of the time across summer, and the air most often feels humid.
Summer is San Sebastián el Grande's weakest season of the year to visit on our travel score. For the whole year in context, see San Sebastián el Grande's year-round climate.
- Avg daytime high
- 28°C
- 2nd-warmest season
- Avg overnight low
- 17°C
- Rainfall
- 449 mm
- 67 wet days
- Avg wind
- 5 km/h
- Travel score
- 4.2
- weakest season of the year
- Months
- Jun · Jul · Aug
Temperature in San Sebastián el Grande in Summer
Over the season highs ease from about 32°C in early June to 27°C by late August.
A typical summer day in San Sebastián el Grande reaches about 28°C and drops to 17°C overnight. The warmest of the three months is June, the coolest July.
How summer really feels in San Sebastián el Grande
Once humidity and wind are folded in, summer brings about 2 days that feel above 32°C and 0 that feel at or below 0°C.
The story in summer is heat — humidity pushes the afternoon "feels like" well above the raw temperature.
San Sebastián el Grande 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 | 25° / 9° | 19 | 2.2 | 10.9 | 8.5 |
| Feb | 27° / 10° | 14 | 2 | 11.3 | 8.2 |
| Mar | 29° / 11° | 7 | 1.2 | 11.9 | 7.0 |
| Apr | 31° / 13° | 5 | 1.3 | 12.5 | 5.5 |
| May | 32° / 16° | 16 | 4.4 | 13 | 4.5 |
| Jun | 30° / 18° | 113 | 17.5 | 13.2 | 4.0 |
| Jul | 28° / 17° | 180 | 25.2 | 13.1 | 4.2 |
| Aug | 27° / 17° | 157 | 24.1 | 12.7 | 4.3 |
| Sep | 27° / 17° | 139 | 20.2 | 12.1 | 4.9 |
| Oct | 27° / 15° | 50 | 8.3 | 11.5 | 6.8 |
| Nov | 26° / 12° | 15 | 2.4 | 11 | 8.2 |
| Dec | 25° / 9° | 8 | 1.7 | 10.8 | 8.5 |
Cloud cover in Summer
The sky is clear or mostly clear about 15% of the time across summer.
Chance of precipitation in Summer
San Sebastián el Grande gets around 449 mm of rain over 67 wet days across summer. The line is the day-by-day chance of measurable precipitation.
Humidity in Summer
Most of summer feels humid — 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 13 h 12 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 6.0 kWh/m².
Hazard calendar for San Sebastián el Grande
In summer, San Sebastián el Grande overlaps its rainy season season. The full year is below, with each hazard's peak months called out.
San Sebastián el Grande's rainy season runs June–September, when most of the year's rain falls.
Is summer a good time to visit San Sebastián el Grande?
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 Sebastián el Grande for sightseeing.
What to pack for San Sebastián el Grande in Summer
From summer's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In summer, San Sebastián el Grande sees daytime highs around 28°C and nights near 17°C. Pack light clothes, rain gear and sun protection. About 67 days see rain.
UV index in San Sebastián el Grande 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 Sebastián el Grande peaks around May 10 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 15 at about 7 (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) | 8 | 11 | 13 | 14 | 14 | 13 | 12 | 13 | 12 | 10 | 8 | 7 |
| Level | Very high | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Very high | High |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 8 | Very high |
| Feb | 11 | Extreme |
| Mar | 13 | Extreme |
| Apr | 14 | Extreme |
| May | 14 | Extreme |
| Jun | 13 | Extreme |
| Jul | 12 | Extreme |
| Aug | 13 | Extreme |
| Sep | 12 | Extreme |
| Oct | 10 | Extreme |
| Nov | 8 | Very high |
| Dec | 7 | High |
Air quality in San Sebastián el Grande 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 Sebastián el Grande is worst in May — around 44 µg/m³ PM2.5 (poor), about 3.2× the cleanest month (July, 14 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) | 20 | 18 | 20 | 33 | 44 | 17 | 14 | 15 | 17 | 17 | 18 | 21 |
| Level | Moderate | Moderate | Moderate | Moderate | Poor | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 20 | Moderate |
| Feb | 18 | Moderate |
| Mar | 20 | Moderate |
| Apr | 33 | Moderate |
| May | 44 | Poor |
| Jun | 17 | Moderate |
| Jul | 14 | Moderate |
| Aug | 15 | Moderate |
| Sep | 17 | Moderate |
| Oct | 17 | Moderate |
| Nov | 18 | Moderate |
| Dec | 21 | Moderate |
Where is San Sebastián el Grande?
San Sebastián el Grande sits at 20.5°N, 103.4°W, 1,589 m above sea level, in Mexico. The nearest listed city is Santa Anita, 2.0 km away.
Topography around San Sebastián el Grande
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of San Sebastián el Grande.
Within 3 km, the terrain around San Sebastián el Grande has significant variations in elevation — a maximum elevation change of 427 m around an average of 1,588 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 790 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,409 m.
The land around San Sebastián el Grande is covered by artificial surfaces (30%), cropland (27%) and grassland (25%) within 3 km, artificial surfaces (32%), trees (23%) and cropland (20%) within 16 km, and trees (35%) and cropland (21%) 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 Sebastián el Grande (20.5328°, -103.4294°, elevation 1,589 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.