Treinta y Tres in Summer
In summer (December, January and February), Treinta y Tres sees average daytime highs around 28°C and overnight lows near 17°C, with 264 mm of rain over about 26 wet days across the season. It is the warmest season of the year and the driest season of the year.
Across summer, daytime highs hold fairly steady around 28°C. The sky is clear or mostly clear about 37% of the time across summer, and the air most often feels muggy.
Summer is Treinta y Tres's 3rd-best season to visit on our travel score. For the whole year in context, see Treinta y Tres's year-round climate.
- Avg daytime high
- 28°C
- warmest season of the year
- Avg overnight low
- 17°C
- Rainfall
- 264 mm
- 26 wet days
- Avg wind
- 13 km/h
- Travel score
- 6.2
- 3rd-best season
- Months
- Dec · Jan · Feb
Temperature in Treinta y Tres in Summer
Across summer, daytime highs hold fairly steady around 28°C.
A typical summer day in Treinta y Tres reaches about 28°C and drops to 17°C overnight. The warmest of the three months is January, the coolest December.
Treinta y Tres weather by month
How the three summer months (December, January and February) 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 | 29° / 18° | 83 | 8.5 | 13.9 | 5.8 |
| Feb | 28° / 18° | 94 | 8.9 | 13.2 | 6.1 |
| Mar | 27° / 16° | 82 | 8.7 | 12.3 | 6.8 |
| Apr | 23° / 14° | 108 | 8.7 | 11.2 | 7.0 |
| May | 19° / 10° | 97 | 7 | 10.3 | 6.6 |
| Jun | 17° / 8° | 91 | 8.1 | 9.8 | 5.5 |
| Jul | 16° / 7° | 89 | 8 | 10 | 5.3 |
| Aug | 18° / 8° | 103 | 8.2 | 10.8 | 6.1 |
| Sep | 19° / 9° | 99 | 8.6 | 11.8 | 6.3 |
| Oct | 22° / 12° | 112 | 10 | 12.8 | 6.6 |
| Nov | 25° / 14° | 92 | 8.1 | 13.7 | 7.2 |
| Dec | 28° / 16° | 87 | 8.4 | 14.2 | 6.6 |
Cloud cover in Summer
The sky is clear or mostly clear about 37% of the time across summer.
Chance of precipitation in Summer
Treinta y Tres gets around 264 mm of rain over 26 wet days across summer. The line is the day-by-day chance of measurable precipitation.
Humidity in Summer
Most of summer feels muggy — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Summer
Winds average 13 km/h across summer.
Sunrise & sunset in Summer
Daylight runs from about 14 hours in early December to 12 h 48 min by late February. 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 6.5 kWh/m².
Is summer a good time to visit Treinta y Tres?
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 Treinta y Tres for sightseeing. The water and warmth also suit a beach or pool day.
What to pack for Treinta y Tres in Summer
From summer's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In summer, Treinta y Tres sees daytime highs around 28°C and nights near 17°C. Pack light clothes and sun protection. Worth having: rain gear. About 26 days see rain.
UV index in Treinta y Tres 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 Treinta y Tres peaks around January 15 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 18 at about 3 (moderate).
The index reaches 3 or more — the level where the WHO recommends sun protection — in 11 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 13 | 12 | 10 | 6 | 4 | 3 | 3 | 4 | 6 | 8 | 11 | 12 |
| Level | Extreme | Extreme | Very high | High | Moderate | Moderate | Moderate | Moderate | High | Very high | Extreme | Extreme |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 13 | Extreme |
| Feb | 12 | Extreme |
| Mar | 10 | Very high |
| Apr | 6 | High |
| May | 4 | Moderate |
| Jun | 3 | Moderate |
| Jul | 3 | Moderate |
| Aug | 4 | Moderate |
| Sep | 6 | High |
| Oct | 8 | Very high |
| Nov | 11 | Extreme |
| Dec | 12 | Extreme |
Where is Treinta y Tres?
Treinta y Tres sits at 33.2°S, 54.4°W, 55 m above sea level, in Uruguay. The nearest listed city is Melo, 98 km away.
Topography around Treinta y Tres
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Treinta y Tres.
Within 3 km, the terrain around Treinta y Tres has only modest variations in elevation — a maximum elevation change of 44 m around an average of 40 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 144 m; within 80 km, significant variations in elevation — a maximum elevation change of 375 m.
The land around Treinta y Tres is covered by grassland (38%), trees (35%) and artificial surfaces (24%) within 3 km, grassland (72%) within 16 km, and grassland (69%) within 80 km.
Uruguay travel facts
- Travel advisory
- Level 2
- Exercise Increased Caution
- Power plugs
- Type C / F / I / L
- 230 V · 50 Hz
- Prices
- ≈ 66% of US
- price level, 2025
- GDP per capita
- $25,216
- 2025
- Happiness
- 6.6 / 10
- World Happiness, 2025
- Homicide rate
- 11.2
- per 100k, 2023
- Road deaths
- 14.8
- per 100k/yr, 2019
- Income group
- High
- World Bank
- English
- Moderate
- EF EPI 542
- 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 Treinta y Tres (-33.231°, -54.3858°, elevation 55 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.