San Miguel in Fall
In fall (September, October and November), San Miguel sees average daytime highs around 22°C and overnight lows near 15°C, with 1346 mm of rain over about 85 wet days across the season. It is the coldest season of the year and the wettest season of the year.
Across fall, daytime highs hold fairly steady around 22°C. The sky is clear or mostly clear about 2% of the time across fall, and the air most often feels humid.
Fall is San Miguel's 3rd-best season to visit on our travel score. San Miguel has little temperature swing across the year, so its calendar seasons blur — the season framing matters less here than for a place with four distinct seasons. For the whole year in context, see San Miguel's year-round climate.
- Avg daytime high
- 22°C
- coldest season of the year
- Avg overnight low
- 15°C
- Rainfall
- 1346 mm
- 85 wet days
- Avg wind
- 4 km/h
- Travel score
- 3.6
- 3rd-best season
- Months
- Sep · Oct · Nov
Temperature in San Miguel in Fall
Across fall, daytime highs hold fairly steady around 22°C.
A typical fall day in San Miguel reaches about 22°C and drops to 15°C overnight. The warmest of the three months is September, the coolest November.
San Miguel 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 | 22° / 14° | 29 | 5.9 | 11.5 | 7.4 |
| Feb | 23° / 14° | 27 | 5.6 | 11.7 | 7.7 |
| Mar | 23° / 14° | 40 | 9.9 | 11.9 | 7.0 |
| Apr | 23° / 15° | 123 | 19.7 | 12.2 | 5.1 |
| May | 22° / 16° | 455 | 28.8 | 12.4 | 3.6 |
| Jun | 22° / 16° | 458 | 28.9 | 12.6 | 3.4 |
| Jul | 22° / 15° | 340 | 28.1 | 12.5 | 3.6 |
| Aug | 22° / 15° | 431 | 29.3 | 12.3 | 3.5 |
| Sep | 22° / 15° | 509 | 29.9 | 12.1 | 3.3 |
| Oct | 22° / 15° | 537 | 30.2 | 11.8 | 3.3 |
| Nov | 21° / 15° | 299 | 24.9 | 11.5 | 4.1 |
| Dec | 22° / 14° | 88 | 13.1 | 11.4 | 6.1 |
Cloud cover in Fall
The sky is clear or mostly clear about 2% of the time across fall.
Chance of precipitation in Fall
San Miguel gets around 1346 mm of rain over 85 wet days across fall. The line is the day-by-day chance of measurable precipitation.
Humidity in Fall
Most of fall feels humid — 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 12 min in early September to 11 h 30 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 3.9 kWh/m².
Hazard calendar for San Miguel
In fall, San Miguel overlaps its rainy season season. The full year is below, with each hazard's peak months called out.
San Miguel's rainy season runs May–November, when most of the year's rain falls.
Is fall a good time to visit San Miguel?
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 Miguel.
What to pack for San Miguel in Fall
From fall's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In fall, San Miguel sees daytime highs around 22°C and nights near 15°C. Pack rain gear. About 85 days see rain.
Sea temperature near San Miguel in Fall
The nearest coast averages about 28°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 56 km away) is warmest in March at about 30°C and coldest in November near 28°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 | 30 | 30 | 29 | 29 | 29 | 29 | 29 | 28 | 28 | 28 |
| Comfort | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Warm | Tropical |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 29 | Tropical |
| Feb | 29 | Tropical |
| Mar | 30 | Tropical |
| Apr | 30 | Tropical |
| May | 29 | Tropical |
| Jun | 29 | Tropical |
| Jul | 29 | Tropical |
| Aug | 29 | Tropical |
| Sep | 29 | Tropical |
| Oct | 28 | Tropical |
| Nov | 28 | Warm |
| Dec | 28 | Tropical |
UV index in San Miguel in Fall
Clear-sky midday UV across fall 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 Miguel peaks around March 19 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 16 at about 10 (extreme).
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) | 12 | 14 | 15 | 14 | 13 | 13 | 13 | 13 | 13 | 12 | 12 | 10 |
| Level | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 12 | Extreme |
| Feb | 14 | Extreme |
| Mar | 15 | Extreme |
| Apr | 14 | Extreme |
| May | 13 | Extreme |
| Jun | 13 | Extreme |
| Jul | 13 | Extreme |
| Aug | 13 | Extreme |
| Sep | 13 | Extreme |
| Oct | 12 | Extreme |
| Nov | 12 | Extreme |
| Dec | 10 | Extreme |
Air quality in San Miguel 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 Miguel is worst in May — around 19 µg/m³ PM2.5 (moderate), about 2.1× the cleanest month (January, 9 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) | 9 | 10 | 11 | 17 | 19 | 17 | 18 | 17 | 16 | 14 | 12 | 10 |
| Level | Good | Good | Good | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Good | Good |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 9 | Good |
| Feb | 10 | Good |
| Mar | 11 | Good |
| Apr | 17 | Moderate |
| May | 19 | Moderate |
| Jun | 17 | Moderate |
| Jul | 18 | Moderate |
| Aug | 17 | Moderate |
| Sep | 16 | Moderate |
| Oct | 14 | Moderate |
| Nov | 12 | Good |
| Dec | 10 | Good |
Where is San Miguel?
San Miguel sits at 9.9°N, 84.1°W, 1,216 m above sea level, in Costa Rica. The nearest listed city is San Rafael Arriba, 2.0 km away.
Topography around San Miguel
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of San Miguel.
Within 3 km, the terrain around San Miguel has significant variations in elevation — a maximum elevation change of 370 m around an average of 1,248 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,798 m; within 80 km, extreme variations in elevation — a maximum elevation change of 3,764 m.
The land around San Miguel is covered by trees (46%) and artificial surfaces (42%) within 3 km, trees (61%) and artificial surfaces (24%) within 16 km, and trees (68%) within 80 km.
Costa Rica travel facts
- Travel advisory
- Level 2
- Exercise Increased Caution
- Power plugs
- Type A / B
- 120 V · 60 Hz
- Prices
- ≈ 59% of US
- price level, 2025
- GDP per capita
- $19,970
- 2025
- Happiness
- 7.4 / 10
- World Happiness, 2025
- Safe drinking water
- 81%
- of population, 2024
- Homicide rate
- 17.7
- per 100k, 2023
- Road deaths
- 14.8
- per 100k/yr, 2019
- Income group
- High
- World Bank
- English
- Moderate
- EF EPI 516
- 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 Miguel (9.8712°, -84.0608°, elevation 1,216 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.