Anajás weather in September

In September, Anajás sees average daytime highs of 34°C and overnight lows near 23°C, with 46 mm of rain across 10.9 wet days and about 12 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 39% of the time in September, and the air most often feels oppressive.

Daylight stretches from about 12 hours at the start of September to 12 hours by month's end. Set against the rest of the year, September is Anajás's 2nd-clearest and 3rd-windiest month. For the whole year in context, see Anajás's year-round climate.

Daytime high
34°
2nd warmest
Overnight low
23°
9th coldest
Rainfall
46 mm
10.9 wet days
Daylight
12 hours
6:14 AM – 6:14 PM
Cloud cover
48%
2nd clearest
Wind
9 km/h
3rd windiest
Solar energy
6.01 kWh/m²
Travel score
3.2
out of 10

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

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

A typical September day in Anajás reaches about 34°C in the afternoon and slips back to 23°C overnight — a 11°C spread between the day's warmth and the night's chill. On most days the high lands between 32°C and 35°C. Set against its neighbours, September runs on par with August and on par with October.

20°25°30°35°40°151015202530
Avg high (°C)Avg low (°C)
13423
23423
33423
43423
53423
63423
73423
83423
93423
103423
113423
123423
133423
143423
153423
163423
173423
183423
193423
203423
213423
223423
233423
243423
253423
263423
273423
283423
293423
303423

How September really feels in Anajás

Once humidity and wind are folded in, September averages 30 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
30
11 feel dangerously hot (≥ 39°C)
Days feeling ≤ C
0
wind chill below the day's low

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

Anajás weather by month

How September compares with the rest of the year at a glance. September 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
Jan31° / 23°25827.912.12.6
Feb30° / 23°33927.1122.5
Mar30° / 23°40630.2122.5
Apr30° / 23°39029.4122.4
May31° / 23°30827.7122.6
Jun32° / 23°16222.111.93.0
Jul32° / 23°11118.111.93.4
Aug33° / 23°6314.2123.3
Sep34° / 23°4610.9123.2
Oct34° / 23°398.2123.2
Nov34° / 23°478.5123.1
Dec33° / 23°12519.412.12.8

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 39% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 37% of September, with mostly cloudy or overcast conditions the remaining 24%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
17921
27822
37822
47822
57822
67723
77723
87723
97624
107624
117624
127624
137525
147624
157624
167525
177525
187525
197525
207426
217426
227525
237525
247525
257525
267426
277426
287327
297327
307129

Chance of precipitation in September

Any precipitation

Anajás gets around 46 mm of rain over 10.9 wet days in September. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 36% and peaks near 42% on the wettest days. The odds ease toward the end of the month.

0%10%20%30%40%50%151015202530
Rain chance (%)
142
242
341
441
541
640
740
840
939
1039
1139
1239
1339
1439
1538
1638
1737
1837
1936
2035
2135
2234
2333
2432
2531
2631
2730
2829
2929
3028

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the oppressive band about 83% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202530
Muggy (%)Oppressive (%)Miserable (%)
117524
217623
317623
417722
517722
617821
717821
817821
917920
1017920
1127820
1227919
1328018
1428117
1528117
1618316
1718415
1818514
1918613
2018712
2118811
2218910
2318910
241909
251909
261918
271918
281918
291918
301918

Wind in September

Winds average 9 km/h in September.

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

051015151015202530
Wind speed (km/h)Feels
19calm
29calm
39calm
49calm
59calm
69calm
79calm
89calm
99calm
109calm
119calm
129calm
139calm
149calm
159calm
169calm
179calm
189calm
199calm
209calm
219calm
229calm
239calm
249calm
259calm
269calm
279calm
289calm
299calm
309calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 hours at the start of September to 12 hours by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 0 minutes over September. Sunrise moves from 6:20 AM to 6:09 AM, and sunset from 6:19 PM to 6:09 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.06:206:19
212.06:206:19
312.06:196:18
412.06:196:18
512.06:196:18
612.06:186:17
712.06:186:17
812.06:176:17
912.06:176:16
1012.06:176:16
1112.06:166:16
1212.06:166:15
1312.06:156:15
1412.06:156:15
1512.06:156:14
1612.06:146:14
1712.06:146:14
1812.06:136:13
1912.06:136:13
2012.06:136:13
2112.06:126:12
2212.06:126:12
2312.06:116:12
2412.06:116:11
2512.06:116:11
2612.06:106:11
2712.06:106:10
2812.06:106:10
2912.06:096:10
3012.06:096:09

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 6.01 kWh/m².

For context, solar energy here swings from a low near 3.75 kWh/m² to a high of 6.11 kWh/m² in October across the year — September's 6.01 kWh/m² sits near the top of that range.

0246151015202530
Solar energy (kWh/m²)Level
15.8Bright
25.8Bright
35.9Bright
45.9Bright
55.9Bright
65.9Bright
75.9Bright
85.9Bright
95.9Bright
105.9Bright
115.9Bright
126.0Bright
136.0Bright
146.0Bright
156.0Bright
166.0Intense
176.0Intense
186.0Intense
196.0Intense
206.0Intense
216.1Intense
226.1Intense
236.1Intense
246.1Intense
256.1Intense
266.1Intense
276.1Intense
286.1Intense
296.1Intense
306.1Intense
Planning a trip in September

Hazard calendar for Anajás

In seasonPeak

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

Anajás's monsoon runs January–May, when most of the year's rain falls.

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

Is September a good time to visit Anajás?

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

3.2
Sightseeing
3rd-best month of the year
6.0
Beach & pool
3rd-best month of the year

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

What to pack for Anajás in September

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

In September, Anajás sees daytime highs around 34°C and nights near 23°C. Pack light clothes and sun protection. Worth having: rain gear. About 11 days see rain.

light clothessun protectionrain gear

UV index in Anajás in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks 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 Anajás peaks around March 14 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near August 10 at about 10 (extreme).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeMar 14UV 15Aug 10UV 10
UV index (midday)Level
Jan13Extreme
Feb15Extreme
Mar15Extreme
Apr14Extreme
May12Extreme
Jun10Extreme
Jul10Extreme
Aug10Extreme
Sep12Extreme
Oct12Extreme
Nov11Extreme
Dec10Extreme

Air quality in Anajás in September

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where September falls, not just the annual average.

Air quality in Anajás is worst in February — around 20 µg/m³ PM2.5 (moderate), about 2.5× the cleanest month (July, 8 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodModerateFeb 2020 µg/m³Jul 248 µg/m³
PM2.5 (µg/m³)Level
Jan17Moderate
Feb20Moderate
Mar20Moderate
Apr16Moderate
May10Good
Jun9Good
Jul8Good
Aug8Good
Sep10Good
Oct12Good
Nov11Good
Dec13Moderate
Location & terrain

Where is Anajás?

Anajás sits at 1.0°S, 49.9°W, 6 m above sea level, in Brazil. The nearest listed city is Chaves, 92 km away.

Topography around Anajás

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

Within 3 km, the terrain around Anajás has only modest variations in elevation — a maximum elevation change of 28 m around an average of 15 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 39 m; within 80 km, only modest variations in elevation — a maximum elevation change of 39 m.

The land around Anajás is covered by trees (90%) within 3 km, trees (99%) within 16 km, and trees (87%) within 80 km.

3 km
28 m
16 km
39 m
80 km
39 m
treesgrasslandartificial surfaceswaterwetland
September weather nearby: Chaves 92 km · São Sebastião da Boa Vista 93 km · Curralinho 93 km · Breves 98 km · Muaná 100 km · Afuá 105 km · Bagre 106 km · Cachoeira do Arari 109 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 Anajás (-0.9867°, -49.94°, elevation 6 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).