San Juan in Spring
In spring (September, October and November), San Juan sees average daytime highs around 30°C and overnight lows near 23°C, with 614 mm of rain over about 75 wet days across the season. It is the warmest season of the year and the 3rd-wettest season.
Across spring, daytime highs hold fairly steady around 30°C. The sky is clear or mostly clear about 5% of the time across spring, and the air most often feels miserable.
Spring is San Juan's 2nd-best season to visit on our travel score. San Juan 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 Juan's year-round climate.
- Avg daytime high
- 30°C
- warmest season of the year
- Avg overnight low
- 23°C
- Rainfall
- 614 mm
- 75 wet days
- Avg wind
- 4 km/h
- Travel score
- 3.0
- 2nd-best season
- Months
- Sep · Oct · Nov
Temperature in San Juan in Spring
Across spring, daytime highs hold fairly steady around 30°C.
A typical spring day in San Juan reaches about 30°C and drops to 23°C overnight. The warmest of the three months is September, the coolest September.
How spring really feels in San Juan
Once humidity and wind are folded in, spring brings about 91 days that feel above 32°C and 0 that feel at or below 0°C.
The story in spring is heat — humidity pushes the afternoon "feels like" well above the raw temperature.
San Juan weather by month
How the three spring 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 | 30° / 24° | 252 | 25.9 | 12.2 | 3.0 |
| Feb | 30° / 24° | 233 | 24.5 | 12.1 | 2.9 |
| Mar | 30° / 24° | 304 | 28.4 | 12 | 2.8 |
| Apr | 30° / 23° | 294 | 27.3 | 11.9 | 2.9 |
| May | 29° / 23° | 271 | 26.7 | 11.8 | 3.2 |
| Jun | 29° / 23° | 219 | 25 | 11.8 | 3.4 |
| Jul | 29° / 22° | 166 | 23.3 | 11.8 | 3.8 |
| Aug | 30° / 22° | 154 | 21.8 | 11.9 | 3.6 |
| Sep | 31° / 23° | 179 | 23.5 | 12 | 3.2 |
| Oct | 31° / 23° | 201 | 25.9 | 12.1 | 2.9 |
| Nov | 30° / 24° | 235 | 25.8 | 12.2 | 2.9 |
| Dec | 30° / 24° | 263 | 27.2 | 12.2 | 2.9 |
Cloud cover in Spring
The sky is clear or mostly clear about 5% of the time across spring.
Chance of precipitation in Spring
San Juan gets around 614 mm of rain over 75 wet days across spring. The line is the day-by-day chance of measurable precipitation.
Humidity in Spring
Most of spring feels miserable — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Spring
Winds average 4 km/h across spring.
Sunrise & sunset in Spring
Daylight runs from about 11 h 54 min in early September to 12 h 12 min by late November. The lit band spans sunrise to sunset each day.
Solar energy in Spring
Average shortwave solar energy reaching the ground each day across spring, about 5.0 kWh/m².
Is spring a good time to visit San Juan?
Our two travel scores rate spring for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
spring is a weaker month for outdoor sightseeing in San Juan.
What to pack for San Juan in Spring
From spring's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In spring, San Juan sees daytime highs around 30°C and nights near 23°C. Pack light clothes and rain gear. Worth having: sun protection. About 75 days see rain.
UV index in San Juan in Spring
Clear-sky midday UV across spring 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 Juan peaks around February 13 at about 16 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near August 14 at about 9 (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) | 15 | 16 | 15 | 12 | 13 | 11 | 10 | 9 | 12 | 12 | 12 | 12 |
| Level | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Very high | Extreme | Extreme | Extreme | Extreme |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 15 | Extreme |
| Feb | 16 | Extreme |
| Mar | 15 | Extreme |
| Apr | 12 | Extreme |
| May | 13 | Extreme |
| Jun | 11 | Extreme |
| Jul | 10 | Extreme |
| Aug | 9 | Very high |
| Sep | 12 | Extreme |
| Oct | 12 | Extreme |
| Nov | 12 | Extreme |
| Dec | 12 | Extreme |
Air quality in San Juan in Spring
Average fine-particle pollution (PM2.5) through the year — so you can see where spring falls, not just the annual average.
Air quality in San Juan is worst in March — around 15 µg/m³ PM2.5 (moderate), about 1.7× the cleanest month (June, 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) | 14 | 15 | 15 | 12 | 10 | 9 | 10 | 13 | 15 | 10 | 11 | 12 |
| Level | Moderate | Moderate | Moderate | Moderate | Good | Good | Good | Moderate | Moderate | Good | Good | Moderate |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 14 | Moderate |
| Feb | 15 | Moderate |
| Mar | 15 | Moderate |
| Apr | 12 | Moderate |
| May | 10 | Good |
| Jun | 9 | Good |
| Jul | 10 | Good |
| Aug | 13 | Moderate |
| Sep | 15 | Moderate |
| Oct | 10 | Good |
| Nov | 11 | Good |
| Dec | 12 | Moderate |
Where is San Juan?
San Juan sits at 3.8°S, 73.3°W, 99 m above sea level, in Peru. The nearest listed city is Belen, 4.0 km away.
Topography around San Juan
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of San Juan.
Within 3 km, the terrain around San Juan has only modest variations in elevation — a maximum elevation change of 37 m around an average of 94 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 78 m; within 80 km, only modest variations in elevation — a maximum elevation change of 116 m.
The land around San Juan is covered by trees (53%) and artificial surfaces (30%) within 3 km, trees (79%) within 16 km, and trees (96%) 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 Juan (-3.7761°, -73.2814°, elevation 99 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.