Almeirim weather in September

In September, Almeirim sees average daytime highs of 33°C and overnight lows near 25°C, with 26 mm of rain across 5.4 wet days and about 12 hours of daylight. It is the 3rd-warmest and 12th-wettest month of the year here.

Day-to-day highs hold fairly steady near 33°C through the month. The sky is clear or mostly clear about 57% 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 Almeirim's 1st-clearest and 2nd-windiest month. For the whole year in context, see Almeirim's year-round climate.

Daytime high
33°
3rd warmest
Overnight low
25°
10th coldest
Rainfall
26 mm
5.4 wet days
Daylight
12 hours
6:25 AM – 6:24 PM
Cloud cover
42%
1st clearest
Wind
10 km/h
2nd windiest
Solar energy
6.11 kWh/m²
Travel score
4.2
out of 10

Almeirim is human settlement in Brazil.

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

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 33°C through the month.

A typical September day in Almeirim reaches about 33°C in the afternoon and slips back to 25°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 32°C and 34°C. Set against its neighbours, September runs about 1°C warmer than August and on par with October.

20°25°30°35°151015202530
Avg high (°C)Avg low (°C)
13225
23225
33225
43225
53225
63225
73225
83225
93225
103325
113325
123325
133325
143325
153325
163325
173325
183325
193325
203325
213325
223325
233325
243325
253325
263325
273325
283325
293325
303325

How September really feels in Almeirim

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
heat index over the day's high
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.

Almeirim weather by month

How September compares with the rest of the year at a glance. September is the 3rd-warmest and 12th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan30° / 24°18924.412.13.1
Feb30° / 24°22524.4123.0
Mar30° / 24°27828.1122.9
Apr30° / 24°31528.5122.8
May30° / 24°24727.811.92.9
Jun30° / 24°13622.711.93.4
Jul31° / 24°8517.511.94.0
Aug32° / 25°469.8124.3
Sep33° / 25°265.4124.2
Oct33° / 25°306.3123.8
Nov33° / 25°467.912.13.7
Dec32° / 25°9815.112.13.5

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 57% of the time in September, the clearest month of the year.

Beyond those clear spells, partly cloudy skies cover about 23% of September, with mostly cloudy or overcast conditions the remaining 19%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
18515
28515
38515
48515
58515
68416
78416
88416
98317
108218
118218
128218
138218
148119
158119
168119
178020
188020
198020
207921
217921
227822
237822
247822
257723
267723
277624
287624
297426
307426

Chance of precipitation in September

Any precipitation

Almeirim gets around 26 mm of rain over 5.4 wet days in September, the driest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 19% and peaks near 25% on the wettest days. The odds ease toward the end of the month.

0%10%20%30%40%151015202530
Rain chance (%)
124
225
325
425
524
624
724
823
923
1022
1122
1221
1321
1420
1519
1618
1717
1816
1915
2015
2114
2214
2314
2414
2514
2614
2714
2815
2915
3015

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 65% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202530
Muggy (%)Oppressive (%)Miserable (%)
105347
205446
305545
405644
505743
605842
715841
815841
915940
1015940
1115940
1216039
1316039
1416138
1516138
1616237
1706436
1806634
1906733
2006832
2107030
2207129
2307228
2407426
2507525
2607624
2707723
2807822
2907921
3007921

Wind in September

Winds average 10 km/h in September.

Across September, daily wind ranges from about 10 km/h on the calmest days to 11 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
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
2211calm
2311calm
2411calm
2511calm
2611calm
2711calm
2811calm
2911calm
3011calm

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 6:31 AM to 6:19 AM, and sunset from 6:29 PM to 6:20 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.06:316:29
212.06:316:29
312.06:306:29
412.06:306:28
512.06:296:28
612.06:296:28
712.06:296:27
812.06:286:27
912.06:286:27
1012.06:276:26
1112.06:276:26
1212.06:276:26
1312.06:266:25
1412.06:266:25
1512.06:256:25
1612.06:256:24
1712.06:246:24
1812.06:246:24
1912.06:246:23
2012.06:236:23
2112.06:236:23
2212.06:226:22
2312.06:226:22
2412.06:226:22
2512.06:216:21
2612.06:216:21
2712.06:206:21
2812.06:206:21
2912.06:206:20
3012.06:196:20

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 6.11 kWh/m².

For context, solar energy here swings from a low near 3.74 kWh/m² to a high of 6.25 kWh/m² in October across the year — September's 6.11 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
76.0Bright
86.0Bright
96.0Bright
106.0Intense
116.0Intense
126.0Intense
136.1Intense
146.1Intense
156.1Intense
166.1Intense
176.2Intense
186.2Intense
196.2Intense
206.2Intense
216.2Intense
226.2Intense
236.2Intense
246.3Intense
256.3Intense
266.3Intense
276.3Intense
286.3Intense
296.3Intense
306.3Intense
Planning a trip in September

Hazard calendar for Almeirim

In seasonPeak

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

Almeirim'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 Almeirim?

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

4.2
Sightseeing
2nd-best month of the year
7.1
Beach & pool
1st-best month of the year

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

What to pack for Almeirim in September

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

In September, Almeirim sees daytime highs around 33°C and nights near 25°C. Pack light clothes and sun protection. About 5 days see rain.

light clothessun protection

UV index in Almeirim 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 Almeirim peaks around March 14 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 23 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 15Jun 23UV 10
UV index (midday)Level
Jan13Extreme
Feb15Extreme
Mar15Extreme
Apr14Extreme
May12Extreme
Jun10Extreme
Jul10Extreme
Aug10Extreme
Sep12Extreme
Oct12Extreme
Nov11Extreme
Dec11Extreme

Air quality in Almeirim 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 Almeirim is worst in November — around 23 µg/m³ PM2.5 (moderate), about 2.6× the cleanest month (July, 9 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodModerateNov 1722 µg/m³Jul 109 µg/m³
PM2.5 (µg/m³)Level
Jan16Moderate
Feb17Moderate
Mar17Moderate
Apr15Moderate
May10Good
Jun9Good
Jul9Good
Aug11Good
Sep11Good
Oct16Moderate
Nov23Moderate
Dec18Moderate
Location & terrain

Where is Almeirim?

Almeirim sits at 1.5°S, 52.6°W, 6 m above sea level, in Brazil. The nearest listed city is Porto de Moz, 46 km away.

Topography around Almeirim

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

Within 3 km, the terrain around Almeirim has only modest variations in elevation — a maximum elevation change of 176 m around an average of 13 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 211 m; within 80 km, significant variations in elevation — a maximum elevation change of 418 m.

The land around Almeirim is covered by trees (44%), water (26%) and grassland (20%) within 3 km, trees (43%), water (25%) and wetland (21%) within 16 km, and trees (69%) within 80 km.

3 km
176 m
16 km
211 m
80 km
418 m
treesgrasslandartificial surfaceswaterwetland
September weather nearby: Porto de Moz 46 km · Laranjal do Jari 78 km · Prainha 104 km · Gurupá 106 km · Senador José Porfírio 138 km · Vitória do Xingu 164 km · Monte Alegre 175 km · Altamira 191 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 Almeirim (-1.5233°, -52.5817°, 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).