Cairu in Fall
In fall (March, April and May), Cairu sees average daytime highs around 28°C and overnight lows near 24°C, with 396 mm of rain over about 68 wet days across the season. It is the 2nd-warmest season and the wettest season of the year.
Over the season highs ease from about 29°C in early March to 27°C by late May. The sky is clear or mostly clear about 32% of the time across fall, and the air most often feels oppressive.
Fall is Cairu's weakest season of the year to visit on our travel score. Cairu 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 Cairu's year-round climate.
- Avg daytime high
- 28°C
- 2nd-warmest season
- Avg overnight low
- 24°C
- Rainfall
- 396 mm
- 68 wet days
- Avg wind
- 11 km/h
- Travel score
- 4.4
- weakest season of the year
- Months
- Mar · Apr · May
Temperature in Cairu in Fall
Over the season highs ease from about 29°C in early March to 27°C by late May.
A typical fall day in Cairu reaches about 28°C and drops to 24°C overnight. The warmest of the three months is March, the coolest May.
How fall really feels in Cairu
Once humidity and wind are folded in, fall brings about 35 days that feel above 32°C and 0 that feel at or below 0°C.
The story in fall is heat — humidity pushes the afternoon "feels like" well above the raw temperature.
Cairu weather by month
How the three fall months (March, April and May) 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° / 24° | 87 | 19.4 | 12.7 | 4.5 |
| Feb | 29° / 24° | 77 | 19.7 | 12.4 | 4.2 |
| Mar | 29° / 24° | 106 | 22.2 | 12.1 | 4.1 |
| Apr | 28° / 24° | 141 | 23.6 | 11.7 | 4.2 |
| May | 27° / 23° | 149 | 22 | 11.4 | 4.8 |
| Jun | 26° / 22° | 150 | 23.2 | 11.2 | 4.8 |
| Jul | 25° / 21° | 131 | 23.3 | 11.3 | 5.0 |
| Aug | 25° / 21° | 104 | 21.1 | 11.6 | 5.3 |
| Sep | 26° / 22° | 84 | 18.3 | 11.9 | 5.5 |
| Oct | 27° / 23° | 79 | 17.8 | 12.3 | 5.5 |
| Nov | 28° / 23° | 99 | 18 | 12.6 | 5.1 |
| Dec | 28° / 24° | 74 | 16.1 | 12.8 | 5.0 |
Cloud cover in Fall
The sky is clear or mostly clear about 32% of the time across fall.
Chance of precipitation in Fall
Cairu gets around 396 mm of rain over 68 wet days across fall. The line is the day-by-day chance of measurable precipitation.
Humidity in Fall
Most of fall feels oppressive — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Fall
Winds average 11 km/h across fall.
Sunrise & sunset in Fall
Daylight runs from about 12 h 18 min in early March to 11 h 18 min by late May. The lit band spans sunrise to sunset each day.
Solar energy in Fall
Average shortwave solar energy reaching the ground each day across fall, about 4.9 kWh/m².
Is fall a good time to visit Cairu?
Our two travel scores rate fall for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
fall is a reasonable time to visit Cairu for sightseeing.
What to pack for Cairu in Fall
From fall's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In fall, Cairu sees daytime highs around 28°C and nights near 24°C. Pack light clothes and rain gear. Worth having: sun protection. About 68 days see rain.
Sea temperature near Cairu in Fall
The nearest coast averages about 28°C across fall — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea at the nearest coast (about 22 km away) is warmest in March at about 28°C and coldest in August near 25°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) | 28 | 28 | 28 | 28 | 27 | 26 | 26 | 25 | 26 | 26 | 27 | 27 |
| Comfort | Warm | Tropical | Tropical | Tropical | Warm | Warm | Warm | Warm | Warm | Warm | Warm | Warm |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 28 | Warm |
| Feb | 28 | Tropical |
| Mar | 28 | Tropical |
| Apr | 28 | Tropical |
| May | 27 | Warm |
| Jun | 26 | Warm |
| Jul | 26 | Warm |
| Aug | 25 | Warm |
| Sep | 26 | Warm |
| Oct | 26 | Warm |
| Nov | 27 | Warm |
| Dec | 27 | Warm |
UV index in Cairu in Fall
Clear-sky midday UV across fall 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 Cairu peaks around February 19 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 22 at about 8 (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 | 14 | 12 | 9 | 8 | 8 | 10 | 11 | 13 | 13 | 12 |
| Level | Extreme | Extreme | Extreme | Extreme | Very high | Very high | Very high | Very high | Extreme | Extreme | Extreme | Extreme |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 13 | Extreme |
| Feb | 15 | Extreme |
| Mar | 14 | Extreme |
| Apr | 12 | Extreme |
| May | 9 | Very high |
| Jun | 8 | Very high |
| Jul | 8 | Very high |
| Aug | 10 | Very high |
| Sep | 11 | Extreme |
| Oct | 13 | Extreme |
| Nov | 13 | Extreme |
| Dec | 12 | Extreme |
Where is Cairu?
Cairu sits at 13.5°S, 39.0°W, 17 m above sea level, in Brazil. The nearest listed city is Taperoá, 8.0 km away.
Topography around Cairu
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Cairu.
Within 3 km, the terrain around Cairu has only modest variations in elevation — a maximum elevation change of 55 m around an average of 9 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 212 m; within 80 km, large variations in elevation — a maximum elevation change of 898 m.
The land around Cairu is covered by mangroves (33%), trees (32%) and water (31%) within 3 km, trees (59%) within 16 km, and trees (48%) and water (32%) 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 Cairu (-13.4869°, -39.0439°, elevation 17 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.