Riachão in Fall
In fall (March, April and May), Riachão sees average daytime highs around 31°C and overnight lows near 22°C, with 476 mm of rain over about 54 wet days across the season. It is the 3rd-warmest season and the 2nd-wettest season.
Across fall, daytime highs hold fairly steady around 31°C. The sky is clear or mostly clear about 17% of the time across fall, and the air most often feels oppressive.
Fall is Riachão's 2nd-best season to visit on our travel score. For the whole year in context, see Riachão's year-round climate.
- Avg daytime high
- 31°C
- 3rd-warmest season
- Avg overnight low
- 22°C
- Rainfall
- 476 mm
- 54 wet days
- Avg wind
- 7 km/h
- Travel score
- 3.7
- 2nd-best season
- Months
- Mar · Apr · May
Temperature in Riachão in Fall
Across fall, daytime highs hold fairly steady around 31°C.
A typical fall day in Riachão reaches about 31°C and drops to 22°C overnight. The warmest of the three months is May, the coolest March.
How fall really feels in Riachão
Once humidity and wind are folded in, fall brings about 92 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.
Riachão 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 | 30° / 22° | 308 | 27.2 | 12.4 | 3.0 |
| Feb | 30° / 22° | 268 | 24.5 | 12.2 | 3.0 |
| Mar | 30° / 22° | 272 | 26.7 | 12 | 3.0 |
| Apr | 31° / 22° | 149 | 18.4 | 11.8 | 3.7 |
| May | 31° / 22° | 56 | 8.6 | 11.7 | 4.4 |
| Jun | 32° / 22° | 4 | 0.6 | 11.6 | 5.0 |
| Jul | 33° / 22° | 1 | 0.2 | 11.6 | 4.8 |
| Aug | 34° / 22° | 2 | 0.4 | 11.8 | 4.0 |
| Sep | 35° / 23° | 16 | 2.7 | 12 | 3.2 |
| Oct | 33° / 23° | 86 | 9.9 | 12.2 | 3.4 |
| Nov | 31° / 22° | 185 | 18.3 | 12.3 | 3.5 |
| Dec | 30° / 22° | 227 | 23.5 | 12.4 | 3.3 |
Cloud cover in Fall
The sky is clear or mostly clear about 17% of the time across fall.
Chance of precipitation in Fall
Riachão gets around 476 mm of rain over 54 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 7 km/h across fall.
Sunrise & sunset in Fall
Daylight runs from about 12 h 12 min in early March to 11 h 36 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 5.0 kWh/m².
Hazard calendar for Riachão
In fall, Riachão overlaps its monsoon season. The full year is below, with each hazard's peak months called out.
Riachão's monsoon runs November–April, when most of the year's rain falls.
Is fall a good time to visit Riachão?
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 weaker month for outdoor sightseeing in Riachão.
What to pack for Riachão in Fall
From fall's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In fall, Riachão sees daytime highs around 31°C and nights near 22°C. Pack light clothes and rain gear. Worth having: sun protection. About 54 days see rain.
UV index in Riachão in Fall
Clear-sky midday UV across fall 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 Riachão peaks around February 21 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 22 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) | 14 | 15 | 15 | 14 | 11 | 10 | 10 | 11 | 12 | 12 | 12 | 11 |
| Level | Extreme | Extreme | Extreme | Extreme | Extreme | Very high | Very high | Extreme | Extreme | Extreme | Extreme | Extreme |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 14 | Extreme |
| Feb | 15 | Extreme |
| Mar | 15 | Extreme |
| Apr | 14 | Extreme |
| May | 11 | Extreme |
| Jun | 10 | Very high |
| Jul | 10 | Very high |
| Aug | 11 | Extreme |
| Sep | 12 | Extreme |
| Oct | 12 | Extreme |
| Nov | 12 | Extreme |
| Dec | 11 | Extreme |
Air quality in Riachão in Fall
Average fine-particle pollution (PM2.5) through the year — so you can see where fall falls, not just the annual average.
Air quality in Riachão is worst in September — around 30 µg/m³ PM2.5 (moderate), about 5.1× 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) | 12 | 11 | 11 | 11 | 7 | 6 | 7 | 15 | 30 | 26 | 17 | 14 |
| Level | Good | Good | Good | Good | Good | Good | Good | Moderate | Moderate | Moderate | Moderate | Moderate |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 12 | Good |
| Feb | 11 | Good |
| Mar | 11 | Good |
| Apr | 11 | Good |
| May | 7 | Good |
| Jun | 6 | Good |
| Jul | 7 | Good |
| Aug | 15 | Moderate |
| Sep | 30 | Moderate |
| Oct | 26 | Moderate |
| Nov | 17 | Moderate |
| Dec | 14 | Moderate |
Where is Riachão?
Riachão sits at 7.4°S, 46.6°W, 385 m above sea level, in Brazil. The nearest listed city is Balsas, 67 km away.
Topography around Riachão
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Riachão.
Within 3 km, the terrain around Riachão has only modest variations in elevation — a maximum elevation change of 80 m around an average of 378 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 374 m; within 80 km, significant variations in elevation — a maximum elevation change of 475 m.
The land around Riachão is covered by grassland (47%), trees (25%) and shrubs (20%) within 3 km, grassland (45%), trees (33%) and shrubs (21%) within 16 km, and trees (36%), grassland (36%) and shrubs (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 Riachão (-7.3619°, -46.6172°, elevation 385 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.