Tomé-Açu weather in September

In September, Tomé-Açu sees average daytime highs of 35°C and overnight lows near 23°C, with 18 mm of rain across 4.4 wet days and about 12 hours of daylight. It is the 1st-warmest and 12th-wettest month of the year here.

Day-to-day highs hold fairly steady near 35°C through the month. The sky is clear or mostly clear about 42% 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 Tomé-Açu's 3rd-clearest and 1st-windiest month. For the whole year in context, see Tomé-Açu's year-round climate.

Daytime high
35°
1st warmest
Overnight low
23°
9th coldest
Rainfall
18 mm
4.4 wet days
Daylight
12 hours
6:07 AM – 6:07 PM
Cloud cover
46%
3rd clearest
Wind
9 km/h
1st windiest
Solar energy
6.15 kWh/m²
Travel score
3.0
out of 10

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 35°C through the month.

A typical September day in Tomé-Açu reaches about 35°C in the afternoon and slips back to 23°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, September runs on par with August and on par with October.

20°25°30°35°40°151015202530
Avg high (°C)Avg low (°C)
13523
23523
33523
43523
53523
63523
73523
83523
93523
103523
113523
123523
133523
143523
153523
163523
173523
183523
193523
203523
213523
223523
233523
243523
253523
263523
273523
283523
293523
303523

How September really feels in Tomé-Açu

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
30 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.

Tomé-Açu weather by month

How September compares with the rest of the year at a glance. September is the 1st-warmest and 12th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan32° / 23°22925.512.12.6
Feb31° / 23°29625.512.12.5
Mar31° / 23°38229.6122.5
Apr31° / 23°36428.711.92.5
May31° / 23°2172511.92.8
Jun32° / 22°7315.411.93.6
Jul33° / 22°399.411.93.8
Aug34° / 23°195.211.93.3
Sep35° / 23°184.4123.0
Oct35° / 23°286.412.12.9
Nov34° / 24°568.512.12.9
Dec33° / 23°11416.312.12.8

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 42% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 36% of September, with mostly cloudy or overcast conditions the remaining 22%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
18218
28218
38218
48020
58020
68020
78020
88020
97921
107921
117921
127921
137921
147822
157822
167822
177921
187822
197822
207822
217822
227822
237723
247723
257723
267723
277624
287624
297525
307426

Chance of precipitation in September

Any precipitation

Tomé-Açu gets around 18 mm of rain over 4.4 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 15% and peaks near 17% on the wettest days.

0%10%20%30%151015202530
Rain chance (%)
115
215
315
415
515
615
715
815
915
1015
1115
1215
1315
1415
1514
1614
1714
1814
1915
2015
2115
2215
2315
2415
2515
2615
2716
2816
2916
3017

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 79% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202530
Muggy (%)Oppressive (%)
11684
21684
31783
41882
51882
61981
72080
82080
92179
102179
112179
122179
132179
142179
152179
162179
172179
182179
192278
202278
212278
222278
232278
242278
252278
262278
272179
282179
292179
302179

Wind in September

Winds average 9 km/h in September, the windiest month of the year.

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 6:14 AM to 6:01 AM, and sunset from 6:11 PM to 6:02 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.06:146:11
212.06:136:11
312.06:136:10
412.06:126:10
512.06:126:10
612.06:126:10
712.06:116:09
812.06:116:09
912.06:106:09
1012.06:106:08
1112.06:106:08
1212.06:096:08
1312.06:096:07
1412.06:086:07
1512.06:086:07
1612.06:076:07
1712.06:076:06
1812.06:066:06
1912.06:066:06
2012.06:066:05
2112.06:056:05
2212.06:056:05
2312.06:046:04
2412.06:046:04
2512.06:036:04
2612.06:036:04
2712.06:036:03
2812.06:026:03
2912.06:026:03
3012.06:016:02

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 6.15 kWh/m².

For context, solar energy here swings from a low near 4.15 kWh/m² to a high of 6.26 kWh/m² in October across the year — September's 6.15 kWh/m² sits near the top of that range.

0246151015202530
Solar energy (kWh/m²)Level
16.0Bright
26.0Intense
36.0Intense
46.0Intense
56.0Intense
66.0Intense
76.0Intense
86.1Intense
96.1Intense
106.1Intense
116.1Intense
126.1Intense
136.1Intense
146.1Intense
156.1Intense
166.2Intense
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 Tomé-Açu

In seasonPeak

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

Tomé-Açu'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 Tomé-Açu?

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

3.0
Sightseeing
4th-best month of the year
6.4
Beach & pool
3rd-best month of the year

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

What to pack for Tomé-Açu in September

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

In September, Tomé-Açu sees daytime highs around 35°C and nights near 23°C. Pack light clothes and sun protection. About 4 days see rain.

light clothessun protection

UV index in Tomé-Açu 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 Tomé-Açu peaks around March 16 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 10 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 highMar 16UV 15Dec 10UV 10
UV index (midday)Level
Jan13Extreme
Feb14Extreme
Mar15Extreme
Apr14Extreme
May12Extreme
Jun10Extreme
Jul10Extreme
Aug10Extreme
Sep12Extreme
Oct11Extreme
Nov10Very high
Dec10Very high

Air quality in Tomé-Açu 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 Tomé-Açu is worst in November — around 32 µg/m³ PM2.5 (moderate), about 3.4× the cleanest month (June, 9 µg/m³).

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

010203040JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodModerateNov 1931 µg/m³Jun 1410 µg/m³
PM2.5 (µg/m³)Level
Jan17Moderate
Feb18Moderate
Mar18Moderate
Apr15Moderate
May10Good
Jun9Good
Jul11Good
Aug14Moderate
Sep16Moderate
Oct19Moderate
Nov32Moderate
Dec27Moderate
Location & terrain

Where is Tomé-Açu?

Tomé-Açu sits at 2.4°S, 48.2°W, 21 m above sea level, in Brazil. The nearest listed city is Acará, 51 km away.

Topography around Tomé-Açu

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

Within 3 km, the terrain around Tomé-Açu has only modest variations in elevation — a maximum elevation change of 57 m around an average of 22 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 73 m; within 80 km, only modest variations in elevation — a maximum elevation change of 133 m.

The land around Tomé-Açu is covered by trees (64%) and grassland (28%) within 3 km, trees (67%) and grassland (32%) within 16 km, and trees (80%) and grassland (20%) within 80 km.

3 km
57 m
16 km
73 m
80 km
133 m
treesgrasslandartificial surfaceswater
September weather nearby: Acará 51 km · Concórdia do Pará 52 km · Aurora do Pará 73 km · Ipixuna do Pará 75 km · Mãe do Rio 79 km · Moju 91 km · São Domingos do Capim 93 km · Bujaru 101 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 Tomé-Açu (-2.4189°, -48.1522°, elevation 21 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).