Guastatoya in Summer
In summer (June, July and August), Guastatoya sees average daytime highs around 26°C and overnight lows near 17°C, with 466 mm of rain over about 63 wet days across the season. It is the 2nd-warmest season and the wettest season of the year.
Across summer, daytime highs hold fairly steady around 26°C. The sky is clear or mostly clear about 8% of the time across summer, and the air most often feels humid.
Summer is Guastatoya's weakest season of the year to visit on our travel score. For the whole year in context, see Guastatoya's year-round climate.
- Avg daytime high
- 26°C
- 2nd-warmest season
- Avg overnight low
- 17°C
- Rainfall
- 466 mm
- 63 wet days
- Avg wind
- 6 km/h
- Travel score
- 4.8
- weakest season of the year
- Months
- Jun · Jul · Aug
Temperature in Guastatoya in Summer
Across summer, daytime highs hold fairly steady around 26°C.
A typical summer day in Guastatoya reaches about 26°C and drops to 17°C overnight. The warmest of the three months is June, the coolest July.
Guastatoya 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 | 24° / 13° | 6 | 2.1 | 11.2 | 8.5 |
| Feb | 26° / 13° | 4 | 1.3 | 11.5 | 8.4 |
| Mar | 28° / 14° | 12 | 3.2 | 11.9 | 7.7 |
| Apr | 29° / 16° | 41 | 7.3 | 12.3 | 6.1 |
| May | 28° / 17° | 143 | 17.7 | 12.7 | 4.9 |
| Jun | 26° / 17° | 215 | 24.3 | 12.9 | 4.2 |
| Jul | 26° / 16° | 114 | 18.7 | 12.8 | 5.2 |
| Aug | 26° / 17° | 138 | 20.1 | 12.5 | 4.9 |
| Sep | 26° / 17° | 216 | 24.9 | 12.1 | 4.1 |
| Oct | 25° / 16° | 143 | 18.8 | 11.7 | 5.3 |
| Nov | 24° / 15° | 32 | 6.1 | 11.3 | 7.5 |
| Dec | 24° / 14° | 11 | 2.6 | 11.1 | 8.4 |
Cloud cover in Summer
The sky is clear or mostly clear about 8% of the time across summer.
Chance of precipitation in Summer
Guastatoya gets around 466 mm of rain over 63 wet days across summer. The line is the day-by-day chance of measurable precipitation.
Humidity in Summer
Most of summer feels humid — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Summer
Winds average 6 km/h across summer.
Sunrise & sunset in Summer
Daylight runs from about 12 h 48 min in early June to 12 h 18 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 5.7 kWh/m².
Hazard calendar for Guastatoya
In summer, Guastatoya overlaps its monsoon season. The full year is below, with each hazard's peak months called out.
Guastatoya's monsoon runs May–October, when most of the year's rain falls.
Is summer a good time to visit Guastatoya?
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 Guastatoya for sightseeing.
What to pack for Guastatoya in Summer
From summer's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In summer, Guastatoya sees daytime highs around 26°C and nights near 17°C. Pack rain gear. Worth having: light clothes and sun protection. About 63 days see rain.
UV index in Guastatoya in Summer
Clear-sky midday UV across summer averages around 13 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Guastatoya peaks around April 12 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 15 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) | 10 | 13 | 14 | 14 | 13 | 13 | 13 | 13 | 13 | 12 | 10 | 9 |
| Level | Very high | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Very high | Very high |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 10 | Very high |
| Feb | 13 | Extreme |
| Mar | 14 | Extreme |
| Apr | 14 | Extreme |
| May | 13 | Extreme |
| Jun | 13 | Extreme |
| Jul | 13 | Extreme |
| Aug | 13 | Extreme |
| Sep | 13 | Extreme |
| Oct | 12 | Extreme |
| Nov | 10 | Very high |
| Dec | 9 | Very high |
Air quality in Guastatoya 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 Guastatoya is worst in April — around 55 µg/m³ PM2.5 (unhealthy), about 3.0× the cleanest month (November, 18 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) | 19 | 20 | 25 | 55 | 39 | 24 | 23 | 21 | 21 | 20 | 18 | 18 |
| Level | Moderate | Moderate | Moderate | Unhealthy | Poor | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 19 | Moderate |
| Feb | 20 | Moderate |
| Mar | 25 | Moderate |
| Apr | 55 | Unhealthy |
| May | 39 | Poor |
| Jun | 24 | Moderate |
| Jul | 23 | Moderate |
| Aug | 21 | Moderate |
| Sep | 21 | Moderate |
| Oct | 20 | Moderate |
| Nov | 18 | Moderate |
| Dec | 18 | Moderate |
Where is Guastatoya?
Guastatoya sits at 14.9°N, 90.1°W, 520 m above sea level, in Guatemala. The nearest listed city is Sanarate, 16 km away.
Topography around Guastatoya
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Guastatoya.
Within 3 km, the terrain around Guastatoya has large variations in elevation — a maximum elevation change of 682 m around an average of 638 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,805 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,984 m.
The land around Guastatoya is covered by shrubs (70%) within 3 km, shrubs (60%) and trees (24%) within 16 km, and trees (64%) 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 Guastatoya (14.8544°, -90.0699°, elevation 520 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.