San Sebastián in Fall
In fall (September, October and November), San Sebastián sees average daytime highs around 30°C and overnight lows near 23°C, with 956 mm of rain over about 72 wet days across the season. It is the coldest season of the year and the 2nd-wettest season.
Across fall, daytime highs hold fairly steady around 30°C. The sky is clear or mostly clear about 18% of the time across fall, and the air most often feels oppressive.
Fall is San Sebastián's 2nd-best season to visit on our travel score. For the whole year in context, see San Sebastián's year-round climate.
- Avg daytime high
- 30°C
- coldest season of the year
- Avg overnight low
- 23°C
- Rainfall
- 956 mm
- 72 wet days
- Avg wind
- 4 km/h
- Travel score
- 3.3
- 2nd-best season
- Months
- Sep · Oct · Nov
Temperature in San Sebastián in Fall
Across fall, daytime highs hold fairly steady around 30°C.
A typical fall day in San Sebastián reaches about 30°C and drops to 23°C overnight. The warmest of the three months is November, the coolest November.
How fall really feels in San Sebastián
Once humidity and wind are folded in, fall brings about 91 days that feel above 32°C and 0 that feel at or below 0°C.
The story in fall is heat — humidity pushes the afternoon "feels like" well above the raw temperature.
San Sebastián weather by month
How the three fall months (September, October and November) 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 | 31° / 21° | 18 | 4.9 | 11.2 | 5.3 |
| Feb | 32° / 22° | 15 | 3.8 | 11.5 | 4.8 |
| Mar | 33° / 23° | 36 | 8.5 | 11.9 | 4.0 |
| Apr | 33° / 23° | 94 | 14.4 | 12.3 | 3.2 |
| May | 32° / 24° | 351 | 27 | 12.7 | 2.6 |
| Jun | 30° / 23° | 374 | 28.4 | 12.8 | 2.6 |
| Jul | 31° / 23° | 287 | 27 | 12.8 | 2.8 |
| Aug | 30° / 23° | 361 | 28.6 | 12.5 | 2.7 |
| Sep | 30° / 23° | 456 | 29.2 | 12.1 | 2.6 |
| Oct | 30° / 23° | 384 | 27.7 | 11.7 | 3.0 |
| Nov | 30° / 23° | 116 | 15.5 | 11.3 | 4.4 |
| Dec | 31° / 22° | 27 | 6.1 | 11.2 | 5.4 |
Cloud cover in Fall
The sky is clear or mostly clear about 18% of the time across fall.
Chance of precipitation in Fall
San Sebastián gets around 956 mm of rain over 72 wet days across fall. The line is the day-by-day chance of measurable precipitation.
Humidity in Fall
Most of fall feels oppressive — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Fall
Winds average 4 km/h across fall.
Sunrise & sunset in Fall
Daylight runs from about 12 h 18 min in early September to 11 h 12 min by late November. The lit band spans sunrise to sunset each day.
Solar energy in Fall
Average shortwave solar energy reaching the ground each day across fall, about 4.8 kWh/m².
Hazard calendar for San Sebastián
In fall, San Sebastián overlaps its atlantic hurricane and rainy season season. The full year is below, with each hazard's peak months called out.
San Sebastián sits in the Atlantic hurricane belt; the season peaks August–October.
San Sebastián's rainy season runs May–October, when most of the year's rain falls.
Is fall a good time to visit San Sebastián?
Our two travel scores rate fall for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
fall is a weaker month for outdoor sightseeing in San Sebastián.
What to pack for San Sebastián in Fall
From fall's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In fall, San Sebastián sees daytime highs around 30°C and nights near 23°C. Pack light clothes and rain gear. Worth having: sun protection. About 72 days see rain.
Sea temperature near San Sebastián in Fall
The nearest coast averages about 30°C across fall — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea at the nearest coast (about 49 km away) is warmest in July at about 30°C and coldest in February near 29°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) | 29 | 29 | 29 | 29 | 30 | 30 | 30 | 30 | 30 | 29 | 30 | 29 |
| Comfort | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 29 | Tropical |
| Feb | 29 | Tropical |
| Mar | 29 | Tropical |
| Apr | 29 | Tropical |
| May | 30 | Tropical |
| Jun | 30 | Tropical |
| Jul | 30 | Tropical |
| Aug | 30 | Tropical |
| Sep | 30 | Tropical |
| Oct | 29 | Tropical |
| Nov | 30 | Tropical |
| Dec | 29 | Tropical |
UV index in San Sebastián in Fall
Clear-sky midday UV across fall 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 Sebastián peaks around March 21 at about 12 (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 | 11 | 12 | 12 | 11 | 12 | 11 | 11 | 11 | 10 | 8 | 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 | 11 | Extreme |
| Mar | 12 | Extreme |
| Apr | 12 | Extreme |
| May | 11 | Extreme |
| Jun | 12 | Extreme |
| Jul | 11 | Extreme |
| Aug | 11 | Extreme |
| Sep | 11 | Extreme |
| Oct | 10 | Extreme |
| Nov | 8 | Very high |
| Dec | 8 | Very high |
Air quality in San Sebastián in Fall
Average fine-particle pollution (PM2.5) through the year — so you can see where fall falls, not just the annual average.
Air quality in San Sebastián is worst in December — around 45 µg/m³ PM2.5 (poor), about 1.6× the cleanest month (June, 28 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) | 44 | 45 | 41 | 44 | 40 | 28 | 29 | 29 | 29 | 30 | 37 | 45 |
| Level | Poor | Poor | Poor | Poor | Poor | Moderate | Moderate | Moderate | Moderate | Moderate | Poor | Poor |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 44 | Poor |
| Feb | 45 | Poor |
| Mar | 41 | Poor |
| Apr | 44 | Poor |
| May | 40 | Poor |
| Jun | 28 | Moderate |
| Jul | 29 | Moderate |
| Aug | 29 | Moderate |
| Sep | 29 | Moderate |
| Oct | 30 | Moderate |
| Nov | 37 | Poor |
| Dec | 45 | Poor |
Where is San Sebastián?
San Sebastián sits at 14.6°N, 91.6°W, 313 m above sea level, in Guatemala. The nearest listed city is Retalhuleu, 4.0 km away.
Topography around San Sebastián
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of San Sebastián.
Within 3 km, the terrain around San Sebastián has only modest variations in elevation — a maximum elevation change of 150 m around an average of 314 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,200 m; within 80 km, extreme variations in elevation — a maximum elevation change of 4,178 m.
The land around San Sebastián is covered by trees (66%) and grassland (20%) within 3 km, trees (71%) within 16 km, and trees (53%) and water (20%) within 80 km.
Guatemala travel facts
- Travel advisory
- Level 3
- Reconsider Travel
- Power plugs
- Type A / B
- 120 V · 60 Hz
- Prices
- ≈ 43% of US
- price level, 2025
- GDP per capita
- $6,598
- 2025
- Happiness
- 6.5 / 10
- World Happiness, 2025
- Safe drinking water
- 49%
- of population, 2024
- Homicide rate
- 23.4
- per 100k, 2023
- Road deaths
- 22.9
- per 100k/yr, 2019
- Income group
- Upper middle
- World Bank
- English
- Moderate
- EF EPI 510
- 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 (14.5618°, -91.6487°, elevation 313 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.