San Germán in Summer
In summer (June, July and August), San Germán sees average daytime highs around 30°C and overnight lows near 25°C, with 174 mm of rain over about 37 wet days across the season. It is the warmest season of the year and the 2nd-wettest season.
Across summer, daytime highs hold fairly steady around 30°C. The sky is clear or mostly clear about 33% of the time across summer, and the air most often feels oppressive.
Summer is San Germán's 3rd-best season to visit on our travel score. San Germán 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 Germán's year-round climate.
- Avg daytime high
- 30°C
- warmest season of the year
- Avg overnight low
- 25°C
- Rainfall
- 174 mm
- 37 wet days
- Avg wind
- 16 km/h
- Travel score
- 5.0
- 3rd-best season
- Months
- Jun · Jul · Aug
Temperature in San Germán in Summer
Across summer, daytime highs hold fairly steady around 30°C.
A typical summer day in San Germán reaches about 30°C and drops to 25°C overnight. The warmest of the three months is July, the coolest June.
How summer really feels in San Germán
Once humidity and wind are folded in, summer brings about 89 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 Germán 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 | 28° / 22° | 13 | 3.5 | 11 | 7.8 |
| Feb | 27° / 22° | 16 | 3.8 | 11.4 | 7.7 |
| Mar | 27° / 22° | 31 | 6.7 | 11.9 | 7.2 |
| Apr | 28° / 23° | 43 | 9.5 | 12.4 | 6.6 |
| May | 28° / 24° | 71 | 11.8 | 12.8 | 5.7 |
| Jun | 29° / 25° | 42 | 9.6 | 13.1 | 5.3 |
| Jul | 30° / 25° | 53 | 11.9 | 13 | 5.0 |
| Aug | 30° / 25° | 79 | 15 | 12.6 | 4.6 |
| Sep | 29° / 25° | 116 | 17.3 | 12.1 | 4.4 |
| Oct | 29° / 25° | 104 | 17.7 | 11.6 | 4.6 |
| Nov | 28° / 24° | 72 | 11.5 | 11.2 | 5.7 |
| Dec | 28° / 23° | 21 | 4.1 | 10.9 | 7.5 |
Cloud cover in Summer
The sky is clear or mostly clear about 33% of the time across summer.
Chance of precipitation in Summer
San Germán gets around 174 mm of rain over 37 wet days across summer. The line is the day-by-day chance of measurable precipitation.
Humidity in Summer
Most of summer feels oppressive — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Summer
Winds average 16 km/h across summer.
Sunrise & sunset in Summer
Daylight runs from about 13 hours 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 6.6 kWh/m².
Hazard calendar for San Germán
In summer, San Germán overlaps its atlantic hurricane, rainy season and dust season. The full year is below, with each hazard's peak months called out.
San Germán sits in the Atlantic hurricane belt; the season peaks August–October.
San Germán's rainy season runs July–November, when most of the year's rain falls.
San Germán sees seasonal dust haze (July), heaviest in July.
Is summer a good time to visit San Germán?
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 Germán for sightseeing. The water and warmth also suit a beach or pool day.
What to pack for San Germán in Summer
From summer's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In summer, San Germán sees daytime highs around 30°C and nights near 25°C. Pack light clothes, rain gear and sun protection. About 37 days see rain.
Sea temperature near San Germán in Summer
The nearest coast averages about 29°C across summer — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea offshore is warmest in September at about 29°C and coldest in February near 27°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) | 27 | 27 | 27 | 27 | 28 | 28 | 29 | 29 | 29 | 29 | 29 | 28 |
| Comfort | Warm | Warm | Warm | Warm | Warm | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Warm |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 27 | Warm |
| Feb | 27 | Warm |
| Mar | 27 | Warm |
| Apr | 27 | Warm |
| May | 28 | Warm |
| Jun | 28 | Tropical |
| Jul | 29 | Tropical |
| Aug | 29 | Tropical |
| Sep | 29 | Tropical |
| Oct | 29 | Tropical |
| Nov | 29 | Tropical |
| Dec | 28 | Warm |
UV index in San Germán 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 Germán peaks around April 13 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 15 at about 7 (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) | 8 | 10 | 12 | 13 | 11 | 12 | 11 | 12 | 12 | 10 | 8 | 7 |
| Level | Very high | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Very high | Very high | High |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 8 | Very high |
| Feb | 10 | Extreme |
| Mar | 12 | Extreme |
| Apr | 13 | Extreme |
| May | 11 | Extreme |
| Jun | 12 | Extreme |
| Jul | 11 | Extreme |
| Aug | 12 | Extreme |
| Sep | 12 | Extreme |
| Oct | 10 | Very high |
| Nov | 8 | Very high |
| Dec | 7 | High |
Air quality in San Germán 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 Germán is worst in July — around 25 µg/m³ PM2.5 (moderate), about 4.8× the cleanest month (January, 5 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) | 5 | 7 | 7 | 8 | 15 | 25 | 25 | 20 | 15 | 15 | 8 | 5 |
| Level | Good | Good | Good | Good | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Good | Good |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 5 | Good |
| Feb | 7 | Good |
| Mar | 7 | Good |
| Apr | 8 | Good |
| May | 15 | Moderate |
| Jun | 25 | Moderate |
| Jul | 25 | Moderate |
| Aug | 20 | Moderate |
| Sep | 15 | Moderate |
| Oct | 15 | Moderate |
| Nov | 8 | Good |
| Dec | 5 | Good |
Where is San Germán?
San Germán sits at 18.1°N, 67.0°W, 0 m above sea level, in Puerto Rico. The nearest listed city is La Parguera, 12 km away.
Topography around San Germán
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of San Germán.
Within 3 km, the terrain around San Germán has only modest variations in elevation — a maximum elevation change of 191 m around an average of 83 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 900 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,307 m.
The land around San Germán is covered by trees (74%) within 3 km, trees (61%) and grassland (23%) within 16 km, and water (68%) and trees (25%) within 80 km.
Puerto Rico travel facts
- Power plugs
- Type A / B
- 120 V · 60 Hz
- Prices
- ≈ 78% of US
- price level, 2025
- GDP per capita
- $40,620
- 2025
- Happiness
- 7.0 / 10
- World Happiness, 2015
- Safe drinking water
- 99%
- of population, 2024
- Homicide rate
- 14.6
- per 100k, 2023
- Income group
- High
- World Bank
- 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 Germán (18.0816°, -67.0449°, elevation 0 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.