Promissão in Summer
In summer (December, January and February), Promissão sees average daytime highs around 31°C and overnight lows near 22°C, with 592 mm of rain over about 59 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 31°C. The sky is clear or mostly clear about 18% of the time across summer, and the air most often feels oppressive.
Summer is Promissão's weakest season of the year to visit on our travel score. For the whole year in context, see Promissão's year-round climate.
- Avg daytime high
- 31°C
- 2nd-warmest season
- Avg overnight low
- 22°C
- Rainfall
- 592 mm
- 59 wet days
- Avg wind
- 8 km/h
- Travel score
- 3.5
- weakest season of the year
- Months
- Dec · Jan · Feb
Temperature in Promissão in Summer
Across summer, daytime highs hold fairly steady around 31°C.
A typical summer day in Promissão reaches about 31°C and drops to 22°C overnight. The warmest of the three months is December, the coolest December.
How summer really feels in Promissão
Once humidity and wind are folded in, summer brings about 90 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.
Promissão 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 | 30° / 22° | 236 | 21.7 | 13.2 | 3.4 |
| Feb | 31° / 22° | 170 | 18.1 | 12.7 | 3.6 |
| Mar | 30° / 22° | 133 | 16.7 | 12.2 | 4.1 |
| Apr | 30° / 20° | 58 | 7 | 11.5 | 5.7 |
| May | 27° / 17° | 49 | 5.3 | 11 | 7.3 |
| Jun | 27° / 16° | 30 | 3.6 | 10.7 | 7.9 |
| Jul | 27° / 15° | 20 | 2.9 | 10.8 | 8.0 |
| Aug | 29° / 17° | 24 | 3.1 | 11.3 | 6.6 |
| Sep | 31° / 19° | 57 | 6.9 | 11.9 | 5.2 |
| Oct | 31° / 20° | 102 | 11.1 | 12.5 | 4.2 |
| Nov | 31° / 21° | 140 | 14.2 | 13 | 4.0 |
| Dec | 31° / 22° | 187 | 19.5 | 13.3 | 3.6 |
Cloud cover in Summer
The sky is clear or mostly clear about 18% of the time across summer.
Chance of precipitation in Summer
Promissão gets around 592 mm of rain over 59 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 8 km/h across summer.
Sunrise & sunset in Summer
Daylight runs from about 13 h 12 min in early December to 12 h 30 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 5.8 kWh/m².
Hazard calendar for Promissão
In summer, Promissão overlaps its monsoon season. The full year is below, with each hazard's peak months called out.
Promissão's monsoon runs November–March, when most of the year's rain falls.
Is summer a good time to visit Promissão?
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 weaker month for outdoor sightseeing in Promissão.
What to pack for Promissão in Summer
From summer's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In summer, Promissão sees daytime highs around 31°C and nights near 22°C. Pack light clothes and rain gear. Worth having: sun protection. About 59 days see rain.
UV index in Promissão in Summer
Clear-sky midday UV across summer averages around 14 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Promissão peaks around January 21 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 10 at about 6 (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 | 15 | 13 | 10 | 7 | 6 | 6 | 8 | 9 | 11 | 13 | 13 |
| Level | Extreme | Extreme | Extreme | Very high | Very high | High | High | Very high | Very high | Extreme | Extreme | Extreme |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 15 | Extreme |
| Feb | 15 | Extreme |
| Mar | 13 | Extreme |
| Apr | 10 | Very high |
| May | 7 | Very high |
| Jun | 6 | High |
| Jul | 6 | High |
| Aug | 8 | Very high |
| Sep | 9 | Very high |
| Oct | 11 | Extreme |
| Nov | 13 | Extreme |
| Dec | 13 | Extreme |
Air quality in Promissão 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 Promissão is worst in September — around 22 µg/m³ PM2.5 (moderate), about 2.8× the cleanest month (November, 8 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) | 9 | 9 | 9 | 10 | 11 | 11 | 11 | 18 | 22 | 15 | 8 | 8 |
| Level | Good | Good | Good | Good | Good | Good | Good | Moderate | Moderate | Moderate | Good | Good |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 9 | Good |
| Feb | 9 | Good |
| Mar | 9 | Good |
| Apr | 10 | Good |
| May | 11 | Good |
| Jun | 11 | Good |
| Jul | 11 | Good |
| Aug | 18 | Moderate |
| Sep | 22 | Moderate |
| Oct | 15 | Moderate |
| Nov | 8 | Good |
| Dec | 8 | Good |
Where is Promissão?
Promissão sits at 21.5°S, 49.9°W, 428 m above sea level, in Brazil. The nearest listed city is Lins, 20 km away.
Topography around Promissão
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Promissão.
Within 3 km, the terrain around Promissão has only modest variations in elevation — a maximum elevation change of 73 m around an average of 416 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 155 m; within 80 km, significant variations in elevation — a maximum elevation change of 375 m.
The land around Promissão is covered by cropland (45%) and grassland (22%) within 3 km, cropland (69%) within 16 km, and cropland (57%) and grassland (20%) within 80 km.
Brazil travel facts
- Travel advisory
- Level 2
- Exercise Increased Caution
- Power plugs
- Type C / N
- 127 / 220 V · 60 Hz
- Prices
- ≈ 46% of US
- price level, 2025
- GDP per capita
- $10,713
- 2025
- Happiness
- 6.6 / 10
- World Happiness, 2025
- Safe drinking water
- 89%
- of population, 2024
- Homicide rate
- 19.3
- per 100k, 2023
- Road deaths
- 16
- per 100k/yr, 2019
- Income group
- Upper middle
- World Bank
- English
- Low
- EF EPI 482
- 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 Promissão (-21.5367°, -49.8581°, elevation 428 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.