Riachão weather in August

In August, Riachão sees average daytime highs of 34°C and overnight lows near 22°C, with 2 mm of rain across 0.4 wet days and about 11.8 hours of daylight. It is the 2nd-warmest and 11th-wettest month of the year here.

Day-to-day highs hold fairly steady near 34°C through the month. The sky is clear or mostly clear about 76% of the time in August, and the air most often feels comfortable.

Daylight stretches from about 11 h 42 min at the start of August to 11 h 54 min by month's end. Set against the rest of the year, August is Riachão's 1st-clearest and 2nd-windiest month. For the whole year in context, see Riachão's year-round climate.

Daytime high
34°
2nd warmest
Overnight low
22°
9th coldest
Rainfall
2 mm
0.4 wet days
Daylight
11 h 48 min
6:18 AM – 6:03 PM
Cloud cover
25%
1st clearest
Wind
11 km/h
2nd windiest
Solar energy
6.31 kWh/m²
Travel score
4.0
out of 10

Riachão is settlement in Brazil.

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in August

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 34°C through the month.

A typical August day in Riachão reaches about 34°C in the afternoon and slips back to 22°C overnight — a 12°C spread between the day's warmth and the night's chill. On most days the high lands between 33°C and 36°C. Set against its neighbours, August runs about 1°C warmer than July and on par with September.

15°20°25°30°35°40°151015202531
Avg high (°C)Avg low (°C)
13321
23322
33322
43422
53422
63422
73422
83422
93422
103422
113422
123422
133422
143422
153422
163422
173422
183422
193422
203422
213422
223422
233422
243422
253523
263523
273523
283523
293523
303523
313523

How August really feels in Riachão

Once humidity and wind are folded in, August averages 31 days that feel above 32°C and 0 that feel at or below 0°C — the comfort signal a plain temperature reading hides.

Days feeling ≥ 32°C
31
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

The story in August is heat — humidity pushes the afternoon "feels like" well above the raw temperature.

Riachão weather by month

How August compares with the rest of the year at a glance. August is the 2nd-warmest and 11th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan30° / 22°30827.212.43.0
Feb30° / 22°26824.512.23.0
Mar30° / 22°27226.7123.0
Apr31° / 22°14918.411.83.7
May31° / 22°568.611.74.4
Jun32° / 22°40.611.65.0
Jul33° / 22°10.211.64.8
Aug34° / 22°20.411.84.0
Sep35° / 23°162.7123.2
Oct33° / 23°869.912.23.4
Nov31° / 22°18518.312.33.5
Dec30° / 22°22723.512.43.3

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 76% of the time in August, the clearest month of the year.

Beyond those clear spells, partly cloudy skies cover about 13% of August, with mostly cloudy or overcast conditions the remaining 10%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
1928
2928
3928
4928
5928
6919
7919
8919
9919
10919
119010
129010
139010
148911
158911
168911
178911
188911
198911
208911
218911
229010
239010
249010
259010
268911
278911
288911
298911
308911
318911

Chance of precipitation in August

Any precipitation

Riachão gets around 2 mm of rain over 0.4 wet days in August. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 1% and peaks near 3% on the wettest days.

0%10%20%30%151015202531
Rain chance (%)
10
20
30
40
50
60
71
81
91
101
111
121
131
141
151
161
171
181
191
201
211
221
231
241
252
262
272
282
292
303
313

Humidity in August

DryComfortableHumidMuggyOppressiveMiserable

Most of August feels comfortable — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, August lands in the comfortable band about 59% of days. Sticky, muggy-or-worse air turns up on roughly 5% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)
11261243
21261243
31361233
41361233
51361233
61361233
71362223
81362223
91362223
101361224
111361224
121361224
131361224
141361224
151361224
161361224
171360234
181359235
191359235
201359235
211359235
221259236
231259236
241258237
251258237
261256248
271256248
281255249
2912532510
3012532510
3112522511

Wind in August

Winds average 11 km/h in August.

Across August, daily wind ranges from about 11 km/h on the calmest days to 12 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (km/h)Feels
112calm
212calm
312calm
412calm
512calm
612calm
712calm
812calm
912calm
1012calm
1112calm
1212calm
1312calm
1412calm
1512calm
1612calm
1712calm
1812calm
1912calm
2012calm
2111calm
2211calm
2311calm
2411calm
2511calm
2611calm
2711calm
2811calm
2911calm
3011calm
3111calm

Sunrise & sunset in August

DaylightNight

Daylight runs from about 11 h 42 min at the start of August to 11 h 54 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 12 minutes over August. Sunrise moves from 6:22 AM to 6:11 AM, and sunset from 6:03 PM to 6:02 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
111.76:226:03
211.76:226:03
311.76:226:03
411.76:226:03
511.76:216:03
611.76:216:03
711.76:216:03
811.76:216:03
911.76:206:03
1011.76:206:03
1111.76:206:03
1211.76:196:03
1311.76:196:03
1411.76:196:03
1511.86:186:03
1611.86:186:03
1711.86:176:03
1811.86:176:03
1911.86:176:03
2011.86:166:03
2111.86:166:03
2211.86:156:03
2311.86:156:03
2411.86:146:03
2511.86:146:03
2611.86:136:03
2711.86:136:03
2811.86:136:02
2911.86:126:02
3011.86:116:02
3111.96:116:02

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 6.31 kWh/m².

For context, solar energy here swings from a low near 4.88 kWh/m² to a high of 6.55 kWh/m² in September across the year — August's 6.31 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
16.1Intense
26.1Intense
36.1Intense
46.1Intense
56.2Intense
66.2Intense
76.2Intense
86.2Intense
96.2Intense
106.2Intense
116.2Intense
126.3Intense
136.3Intense
146.3Intense
156.3Intense
166.3Intense
176.3Intense
186.3Intense
196.3Intense
206.4Intense
216.4Intense
226.4Intense
236.4Intense
246.4Intense
256.4Intense
266.4Intense
276.5Intense
286.5Intense
296.5Intense
306.5Intense
316.5Intense
Planning a trip in August

Hazard calendar for Riachão

In seasonPeak

None of Riachão's seasonal hazards are active in August. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.

Riachão's monsoon runs November–April, when most of the year's rain falls.

Monsoon
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is August a good time to visit Riachão?

Our two travel scores rate August for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

4.0
Sightseeing
4th-best month of the year
7.8
Beach & pool
3rd-best month of the year

August is a reasonable time to visit Riachão for sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Riachão in August

From August's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In August, Riachão sees daytime highs around 34°C and nights near 22°C. Pack light clothes and sun protection.

light clothessun protection

UV index in Riachão in August

LowModerateHighVery highExtreme

Clear-sky midday UV in August peaks around 11 (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.

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highExtremeFeb 21UV 15Jun 22UV 10
UV index (midday)Level
Jan14Extreme
Feb15Extreme
Mar15Extreme
Apr14Extreme
May11Extreme
Jun10Very high
Jul10Very high
Aug11Extreme
Sep12Extreme
Oct12Extreme
Nov12Extreme
Dec11Extreme

Air quality in Riachão in August

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where August 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).

010203040JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateSep 2029 µg/m³Jun 186 µg/m³
PM2.5 (µg/m³)Level
Jan12Good
Feb11Good
Mar11Good
Apr11Good
May7Good
Jun6Good
Jul7Good
Aug15Moderate
Sep30Moderate
Oct26Moderate
Nov17Moderate
Dec14Moderate
Location & terrain

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.

3 km
80 m
16 km
374 m
80 km
475 m
treesshrubsgrasslandcroplandartificial surfaces
August weather nearby: Balsas 67 km · Carolina 93 km · Formosa da Serra Negra 112 km · Estreito 128 km · São Raimundo das Mangabeiras 131 km · Porto Franco 143 km · Tocantinópolis 145 km · Sítio Novo 165 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
Roman Catholic 57%Evangelical 27%none 9%other 4%

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. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).