Fortuna in Summer
In summer (December, January and February), Fortuna sees average daytime highs around 31°C and overnight lows near 22°C, with 590 mm of rain over about 68 wet days across the season. It is the 3rd-warmest season and the wettest season of the year.
Over the season highs ease from about 32°C in early December to 30°C by late February. The sky is clear or mostly clear about 7% of the time across summer, and the air most often feels oppressive.
Summer is Fortuna's weakest season of the year to visit on our travel score. For the whole year in context, see Fortuna's year-round climate.
- Avg daytime high
- 31°C
- 3rd-warmest season
- Avg overnight low
- 22°C
- Rainfall
- 590 mm
- 68 wet days
- Avg wind
- 5 km/h
- Travel score
- 3.0
- weakest season of the year
- Months
- Dec · Jan · Feb
Temperature in Fortuna in Summer
Over the season highs ease from about 32°C in early December to 30°C by late February.
A typical summer day in Fortuna reaches about 31°C and drops to 22°C overnight. The warmest of the three months is December, the coolest February.
How summer really feels in Fortuna
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.
Fortuna 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 | 31° / 22° | 234 | 26 | 12.3 | 2.9 |
| Feb | 30° / 22° | 220 | 24.3 | 12.2 | 2.9 |
| Mar | 30° / 22° | 248 | 27.6 | 12 | 2.8 |
| Apr | 31° / 22° | 173 | 21.9 | 11.9 | 3.3 |
| May | 31° / 22° | 73 | 11.5 | 11.7 | 4.2 |
| Jun | 32° / 22° | 8 | 2 | 11.7 | 4.8 |
| Jul | 33° / 22° | 7 | 0.7 | 11.7 | 4.7 |
| Aug | 34° / 22° | 1 | 0.2 | 11.8 | 4.0 |
| Sep | 35° / 23° | 13 | 1.7 | 12 | 3.2 |
| Oct | 35° / 23° | 30 | 4.6 | 12.1 | 3.1 |
| Nov | 33° / 23° | 91 | 11.9 | 12.3 | 3.2 |
| Dec | 32° / 23° | 137 | 17.6 | 12.3 | 3.2 |
Cloud cover in Summer
The sky is clear or mostly clear about 7% of the time across summer.
Chance of precipitation in Summer
Fortuna gets around 590 mm of rain over 68 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 5 km/h across summer.
Sunrise & sunset in Summer
Daylight runs from about 12 h 18 min in early December to 12 h 06 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 4.8 kWh/m².
Hazard calendar for Fortuna
In summer, Fortuna overlaps its monsoon season. The full year is below, with each hazard's peak months called out.
Fortuna's monsoon runs December–April, when most of the year's rain falls.
Is summer a good time to visit Fortuna?
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 Fortuna.
What to pack for Fortuna in Summer
From summer's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In summer, Fortuna sees daytime highs around 31°C and nights near 22°C. Pack light clothes and rain gear. Worth having: sun protection. About 68 days see rain.
UV index in Fortuna 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 Fortuna peaks around March 11 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near August 10 at about 10 (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) | 13 | 15 | 15 | 14 | 11 | 10 | 10 | 10 | 12 | 12 | 11 | 11 |
| Level | Extreme | Extreme | Extreme | Extreme | Extreme | Very high | Very high | Very high | Extreme | Extreme | Extreme | Extreme |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 13 | Extreme |
| Feb | 15 | Extreme |
| Mar | 15 | Extreme |
| Apr | 14 | Extreme |
| May | 11 | Extreme |
| Jun | 10 | Very high |
| Jul | 10 | Very high |
| Aug | 10 | Very high |
| Sep | 12 | Extreme |
| Oct | 12 | Extreme |
| Nov | 11 | Extreme |
| Dec | 11 | Extreme |
Air quality in Fortuna 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 Fortuna is worst in October — around 53 µg/m³ PM2.5 (poor), about 8.4× the cleanest month (June, 6 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) | 13 | 13 | 12 | 11 | 8 | 6 | 8 | 25 | 53 | 53 | 23 | 17 |
| Level | Moderate | Moderate | Good | Good | Good | Good | Good | Moderate | Poor | Poor | Moderate | Moderate |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 13 | Moderate |
| Feb | 13 | Moderate |
| Mar | 12 | Good |
| Apr | 11 | Good |
| May | 8 | Good |
| Jun | 6 | Good |
| Jul | 8 | Good |
| Aug | 25 | Moderate |
| Sep | 53 | Poor |
| Oct | 53 | Poor |
| Nov | 23 | Moderate |
| Dec | 17 | Moderate |
Where is Fortuna?
Fortuna sits at 5.7°S, 44.2°W, 210 m above sea level, in Brazil. The nearest listed city is São Domingos do Maranhão, 31 km away.
Topography around Fortuna
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Fortuna.
Within 3 km, the terrain around Fortuna has only modest variations in elevation — a maximum elevation change of 108 m around an average of 211 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 278 m; within 80 km, significant variations in elevation — a maximum elevation change of 410 m.
The land around Fortuna is covered by grassland (56%) and trees (35%) within 3 km, trees (59%) and grassland (32%) within 16 km, and trees (68%) and grassland (27%) 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 Fortuna (-5.7333°, -44.1583°, elevation 210 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.