Grajaú weather in August

In August, Grajaú sees average daytime highs of 34°C and overnight lows near 22°C, with 2 mm of rain across 0.3 wet days and about 11.8 hours of daylight. It is the 2nd-warmest and 12th-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 73% of the time in August, and the air most often feels humid.

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 Grajaú's 1st-clearest and 1st-windiest month. For the whole year in context, see Grajaú's year-round climate.

Daytime high
34°
2nd warmest
Overnight low
22°
2nd coldest
Rainfall
2 mm
0.3 wet days
Daylight
11 h 48 min
6:14 AM – 6:03 PM
Cloud cover
28%
1st clearest
Wind
10 km/h
1st windiest
Solar energy
6.18 kWh/m²
Travel score
3.8
out of 10

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 Grajaú reaches about 34°C in the afternoon and slips back to 22°C overnight — a 13°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)
13421
23421
33421
43421
53421
63421
73421
83421
93421
103421
113421
123421
133421
143422
153422
163422
173422
183422
193422
203422
213422
223422
233422
243422
253522
263522
273522
283522
293522
303522
313522

How August really feels in Grajaú

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.

Grajaú weather by month

How August compares with the rest of the year at a glance. August is the 2nd-warmest and 12th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan31° / 23°17224.812.33.0
Feb30° / 22°17523.912.22.9
Mar31° / 23°18826.1122.9
Apr31° / 23°13220.411.93.3
May31° / 22°6410.511.74.2
Jun32° / 22°81.611.74.8
Jul33° / 21°50.811.74.4
Aug34° / 22°20.311.83.8
Sep35° / 23°91.7123.4
Oct34° / 24°325.312.13.4
Nov33° / 24°7811.912.33.4
Dec32° / 23°13517.712.33.3

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 73% of the time in August, the clearest month of the year.

Beyond those clear spells, partly cloudy skies cover about 16% of August, with mostly cloudy or overcast conditions the remaining 11%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
1928
2919
3919
4928
5928
6919
7919
8919
99010
109010
119010
129010
138911
148911
158911
168812
178812
188812
198911
208812
218812
228812
238911
248911
258911
268911
278911
288812
298812
308911
318911

Chance of precipitation in August

Any precipitation

Grajaú gets around 2 mm of rain over 0.3 wet days in August, the driest month. 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 2% on the wettest days.

0%10%20%30%151015202531
Rain chance (%)
11
21
31
41
51
61
71
81
91
101
111
121
131
141
151
161
171
181
191
201
211
221
231
241
251
261
271
281
292
302
312

Humidity in August

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, August lands in the humid band about 43% of days. Sticky, muggy-or-worse air turns up on roughly 42% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
102046295
202046295
302046295
401945305
501945316
601845316
701744326
801744326
901644336
1001645337
1101545337
1201545337
1301446337
1401446327
1511446327
1611446327
1711446328
1811446328
1911445328
2011345338
2111344339
2201344349
2301343359
24012423510
25012413710
26012403811
27012383911
28011374012
29011364012
30011354113
31010354114

Wind in August

Winds average 10 km/h in August, the windiest month of the year.

Across August, daily wind ranges from about 9 km/h on the calmest days to 10 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (km/h)Feels
110calm
210calm
310calm
410calm
510calm
610calm
710calm
810calm
910calm
1010calm
1110calm
1210calm
1310calm
1410calm
1510calm
1610calm
1710calm
1810calm
1910calm
2010calm
2110calm
2210calm
2310calm
2410calm
2510calm
2610calm
279calm
289calm
299calm
309calm
319calm

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 6:18 AM to 6:08 AM, and sunset from 6:03 PM to 6:01 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
111.76:186:03
211.76:186:03
311.86:186:03
411.86:186:03
511.86:186:03
611.86:176:03
711.86:176:03
811.86:176:03
911.86:176:03
1011.86:166:03
1111.86:166:03
1211.86:166:03
1311.86:156:03
1411.86:156:03
1511.86:156:03
1611.86:146:03
1711.86:146:03
1811.86:146:03
1911.86:136:03
2011.86:136:03
2111.86:136:02
2211.86:126:02
2311.86:126:02
2411.86:116:02
2511.96:116:02
2611.96:106:02
2711.96:106:02
2811.96:106:02
2911.96:096:01
3011.96:096:01
3111.96:086:01

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 6.18 kWh/m².

For context, solar energy here swings from a low near 4.51 kWh/m² to a high of 6.39 kWh/m² in September across the year — August's 6.18 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
16.0Bright
26.0Bright
36.0Intense
46.0Intense
56.0Intense
66.0Intense
76.1Intense
86.1Intense
96.1Intense
106.1Intense
116.1Intense
126.1Intense
136.1Intense
146.2Intense
156.2Intense
166.2Intense
176.2Intense
186.2Intense
196.2Intense
206.2Intense
216.2Intense
226.3Intense
236.3Intense
246.3Intense
256.3Intense
266.3Intense
276.3Intense
286.3Intense
296.3Intense
306.3Intense
316.3Intense
Planning a trip in August

Hazard calendar for Grajaú

In seasonPeak

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

Grajaú's monsoon runs December–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 Grajaú?

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

3.8
Sightseeing
4th-best month of the year
7.6
Beach & pool
3rd-best month of the year

August is a weaker month for outdoor sightseeing in Grajaú. The water and warmth also suit a beach or pool day.

What to pack for Grajaú in August

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

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

light clothessun protection

UV index in Grajaú 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 Grajaú peaks around March 12 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 12 at about 10 (extreme).

The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeMar 12UV 15Jul 12UV 10
UV index (midday)Level
Jan14Extreme
Feb15Extreme
Mar15Extreme
Apr14Extreme
May11Extreme
Jun10Extreme
Jul10Very high
Aug11Extreme
Sep12Extreme
Oct12Extreme
Nov12Extreme
Dec10Extreme

Air quality in Grajaú 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 Grajaú is worst in October — around 28 µg/m³ PM2.5 (moderate), about 4.5× the cleanest month (June, 6 µg/m³).

Modeled monthly averages (CAMS reanalysis, 2015–2024).

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodModerateOct 1227 µg/m³Jun 176 µg/m³
PM2.5 (µg/m³)Level
Jan13Moderate
Feb12Good
Mar12Good
Apr11Good
May9Good
Jun6Good
Jul8Good
Aug17Moderate
Sep26Moderate
Oct28Moderate
Nov22Moderate
Dec17Moderate
Location & terrain

Where is Grajaú?

Grajaú sits at 5.8°S, 46.1°W, 163 m above sea level, in Brazil. The nearest listed city is Sítio Novo, 62 km away.

Topography around Grajaú

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Grajaú.

Within 3 km, the terrain around Grajaú has only modest variations in elevation — a maximum elevation change of 115 m around an average of 193 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 218 m; within 80 km, significant variations in elevation — a maximum elevation change of 593 m.

The land around Grajaú is covered by trees (53%), grassland (24%) and artificial surfaces (20%) within 3 km, trees (58%) and grassland (33%) within 16 km, and trees (66%) and grassland (26%) within 80 km.

3 km
115 m
16 km
218 m
80 km
593 m
treesshrubsgrasslandcroplandartificial surfaces
August weather nearby: Sítio Novo 62 km · Formosa da Serra Negra 70 km · Amarante do Maranhão 72 km · Jenipapo dos Vieiras 75 km · Arame 105 km · Barra do Corda 105 km · Governador Edison Lobão 136 km · João Lisboa 146 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 Grajaú (-5.8194°, -46.1386°, elevation 163 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).