San Isidro in Fall
In fall (March, April and May), San Isidro sees average daytime highs around 23°C and overnight lows near 19°C, with 33 mm of rain over about 11 wet days across the season. It is the 2nd-warmest season and the 2nd-wettest season.
Over the season highs ease from about 25°C in early March to 21°C by late May. The sky is clear or mostly clear about 16% of the time across fall, and the air most often feels humid.
Fall is San Isidro's 3rd-best season to visit on our travel score. San Isidro 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 Isidro's year-round climate.
- Avg daytime high
- 23°C
- 2nd-warmest season
- Avg overnight low
- 19°C
- Rainfall
- 33 mm
- 11 wet days
- Avg wind
- 8 km/h
- Travel score
- 7.5
- 3rd-best season
- Months
- Mar · Apr · May
Temperature in San Isidro in Fall
Over the season highs ease from about 25°C in early March to 21°C by late May.
A typical fall day in San Isidro reaches about 23°C and drops to 19°C overnight. The warmest of the three months is March, the coolest May.
San Isidro weather by month
How the three fall months (March, April and May) 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 | 24° / 20° | 19 | 5.7 | 12.6 | 7.0 |
| Feb | 25° / 20° | 31 | 8.9 | 12.4 | 6.3 |
| Mar | 25° / 20° | 24 | 7.6 | 12.1 | 6.7 |
| Apr | 23° / 19° | 7 | 2.6 | 11.7 | 7.8 |
| May | 22° / 17° | 2 | 0.4 | 11.5 | 8.1 |
| Jun | 20° / 17° | 1 | 0 | 11.3 | 7.9 |
| Jul | 20° / 16° | 1 | 0.1 | 11.4 | 7.8 |
| Aug | 19° / 16° | 1 | 0 | 11.6 | 7.9 |
| Sep | 20° / 16° | 2 | 0.3 | 11.9 | 7.7 |
| Oct | 20° / 16° | 3 | 0.6 | 12.3 | 7.6 |
| Nov | 21° / 17° | 3 | 0.7 | 12.6 | 7.6 |
| Dec | 23° / 18° | 6 | 1.7 | 12.7 | 7.5 |
Cloud cover in Fall
The sky is clear or mostly clear about 16% of the time across fall.
Chance of precipitation in Fall
San Isidro gets around 33 mm of rain over 11 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 8 km/h across fall.
Sunrise & sunset in Fall
Daylight runs from about 12 h 18 min in early March to 11 h 18 min by late May. 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 5.6 kWh/m².
Is fall a good time to visit San Isidro?
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 one of the better times to visit San Isidro for general sightseeing.
What to pack for San Isidro in Fall
From fall's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In fall, San Isidro sees daytime highs around 23°C and nights near 19°C. Worth packing: light clothes and sun protection. About 11 days see rain.
Sea temperature near San Isidro in Fall
The nearest coast averages about 20°C across fall — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea offshore is warmest in February at about 22°C and coldest in September near 17°C.
It's comfortable for a long swim from Jan 1 to Apr 9 — about 3.3 months when the water holds above 20°C.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 21 | 22 | 21 | 20 | 19 | 18 | 18 | 17 | 17 | 17 | 18 | 19 |
| Comfort | Refreshing | Refreshing | Refreshing | Cool | Cool | Cool | Cool | Cool | Cool | Cool | Cool | Cool |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 21 | Refreshing |
| Feb | 22 | Refreshing |
| Mar | 21 | Refreshing |
| Apr | 20 | Cool |
| May | 19 | Cool |
| Jun | 18 | Cool |
| Jul | 18 | Cool |
| Aug | 17 | Cool |
| Sep | 17 | Cool |
| Oct | 17 | Cool |
| Nov | 18 | Cool |
| Dec | 19 | Cool |
UV index in San Isidro 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 Isidro peaks around February 12 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 22 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) | 14 | 16 | 13 | 12 | 10 | 8 | 8 | 10 | 10 | 13 | 12 | 13 |
| Level | Extreme | Extreme | Extreme | Extreme | Very high | Very high | Very high | Extreme | Extreme | Extreme | Extreme | Extreme |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 14 | Extreme |
| Feb | 16 | Extreme |
| Mar | 13 | Extreme |
| Apr | 12 | Extreme |
| May | 10 | Very high |
| Jun | 8 | Very high |
| Jul | 8 | Very high |
| Aug | 10 | Extreme |
| Sep | 10 | Extreme |
| Oct | 13 | Extreme |
| Nov | 12 | Extreme |
| Dec | 13 | Extreme |
Air quality in San Isidro 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 Isidro is worst in March — around 23 µg/m³ PM2.5 (moderate), 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) | 17 | 20 | 23 | 22 | 23 | 22 | 20 | 19 | 18 | 18 | 17 | 17 |
| Level | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 17 | Moderate |
| Feb | 20 | Moderate |
| Mar | 23 | Moderate |
| Apr | 22 | Moderate |
| May | 23 | Moderate |
| Jun | 22 | Moderate |
| Jul | 20 | Moderate |
| Aug | 19 | Moderate |
| Sep | 18 | Moderate |
| Oct | 18 | Moderate |
| Nov | 17 | Moderate |
| Dec | 17 | Moderate |
Where is San Isidro?
San Isidro sits at 12.1°S, 77.0°W, 109 m above sea level, in Peru. The nearest listed city is Miraflores, 2.0 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 only modest variations in elevation — a maximum elevation change of 148 m around an average of 91 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 1,046 m; within 80 km, extreme variations in elevation — a maximum elevation change of 4,960 m.
The land around San Isidro is covered by artificial surfaces (83%) within 3 km, artificial surfaces (48%) and water (34%) within 16 km, and water (45%) and bare terrain (30%) within 80 km.
Peru travel facts
- Travel advisory
- Level 2
- Exercise Increased Caution
- Power plugs
- Type A / B / C
- 220 V · 60 Hz
- Prices
- ≈ 51% of US
- price level, 2025
- GDP per capita
- $9,684
- 2025
- Happiness
- 6.0 / 10
- World Happiness, 2025
- Safe drinking water
- 49%
- of population, 2024
- Homicide rate
- 8.6
- per 100k, 2021
- Road deaths
- 13.6
- per 100k/yr, 2019
- Income group
- Upper middle
- World Bank
- English
- Moderate
- EF EPI 519
- 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 (-12.0966°, -77.0426°, elevation 109 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.