Aveiro weather in September

In September, Aveiro sees average daytime highs of 32°C and overnight lows near 24°C, with 80 mm of rain across 15.1 wet days and about 12 hours of daylight. It is the 1st-warmest and 11th-wettest month of the year here.

Day-to-day highs hold fairly steady near 32°C through the month. The sky is clear or mostly clear about 32% of the time in September, and the air most often feels oppressive.

Daylight stretches from about 11 h 54 min at the start of September to 12 hours by month's end. Set against the rest of the year, September is Aveiro's 3rd-clearest and 1st-windiest month. For the whole year in context, see Aveiro's year-round climate.

Daytime high
32°
1st warmest
Overnight low
24°
12th coldest
Rainfall
80 mm
15.1 wet days
Daylight
12 hours
6:36 AM – 6:35 PM
Cloud cover
57%
3rd clearest
Wind
6 km/h
1st windiest
Solar energy
5.86 kWh/m²
Travel score
3.3
out of 10

Aveiro is municipality in the state of Pará, 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 32°C through the month.

A typical September day in Aveiro reaches about 32°C in the afternoon and slips back to 24°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 31°C and 34°C. Set against its neighbours, September runs on par with August and on par with October.

20°25°30°35°151015202530
Avg high (°C)Avg low (°C)
13224
23224
33224
43224
53224
63224
73224
83224
93224
103224
113224
123224
133224
143224
153324
163324
173324
183324
193324
203324
213324
223324
233324
243324
253324
263324
273324
283324
293324
303324

How September really feels in Aveiro

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
3 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.

Aveiro weather by month

How September compares with the rest of the year at a glance. September is the 1st-warmest and 11th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan30° / 23°32427.812.22.9
Feb30° / 23°31325.812.12.8
Mar30° / 23°38729.3122.7
Apr30° / 23°35428.911.92.6
May30° / 23°2512811.82.8
Jun31° / 23°10319.111.83.6
Jul31° / 23°8415.311.84.0
Aug32° / 24°7113.411.93.7
Sep32° / 24°8015.1123.3
Oct32° / 24°11116.812.13.1
Nov32° / 24°15919.212.23.1
Dec31° / 24°21223.912.22.9

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 32% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 25% of September, with mostly cloudy or overcast conditions the remaining 43%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
16040
26040
35941
45941
55842
65842
75842
85842
95842
105842
115842
125842
135842
145842
155842
165842
175842
185743
195743
205644
215644
225644
235644
245545
255545
265446
275248
285248
295149
305050

Chance of precipitation in September

Any precipitation

Aveiro gets around 80 mm of rain over 15.1 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 50% and peaks near 52% on the wettest days.

0%20%40%60%151015202530
Rain chance (%)
151
251
352
452
552
652
752
852
952
1052
1151
1251
1351
1450
1550
1649
1749
1849
1948
2048
2148
2249
2349
2449
2549
2649
2749
2849
2950
3050

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 51% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202530
Muggy (%)Oppressive (%)Miserable (%)
115247
215148
315148
415148
515148
615148
715148
815148
915148
1015148
1115148
1215049
1315049
1415049
1515050
1605050
1704951
1804951
1905050
2005050
2105050
2205050
2305149
2405149
2505149
2605149
2705248
2805248
2905248
3005248

Wind in September

Winds average 6 km/h in September, the windiest month of the year.

Across September, daily wind ranges from about 6 km/h on the calmest days to 6 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (km/h)Feels
16calm
26calm
36calm
46calm
56calm
66calm
76calm
86calm
96calm
106calm
116calm
126calm
136calm
146calm
156calm
166calm
176calm
186calm
196calm
206calm
216calm
226calm
236calm
246calm
256calm
266calm
276calm
286calm
296calm
306calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 11 h 54 min 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 6 minutes over September. Sunrise moves from 6:43 AM to 6:30 AM, and sunset from 6:39 PM to 6:31 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
111.96:436:39
211.96:436:39
311.96:426:38
411.96:426:38
511.96:416:38
611.96:416:38
712.06:406:37
812.06:406:37
912.06:406:37
1012.06:396:37
1112.06:396:36
1212.06:386:36
1312.06:386:36
1412.06:376:36
1512.06:376:35
1612.06:366:35
1712.06:366:35
1812.06:356:35
1912.06:356:34
2012.06:346:34
2112.06:346:34
2212.06:336:33
2312.06:336:33
2412.06:326:33
2512.06:326:33
2612.06:326:32
2712.06:316:32
2812.06:316:32
2912.06:306:32
3012.06:306:31

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.86 kWh/m².

For context, solar energy here swings from a low near 3.98 kWh/m² to a high of 5.89 kWh/m² in October across the year — September's 5.86 kWh/m² sits near the top of that range.

0246151015202530
Solar energy (kWh/m²)Level
15.7Bright
25.7Bright
35.7Bright
45.7Bright
55.7Bright
65.7Bright
75.8Bright
85.8Bright
95.8Bright
105.8Bright
115.8Bright
125.8Bright
135.8Bright
145.9Bright
155.9Bright
165.9Bright
175.9Bright
185.9Bright
195.9Bright
205.9Bright
216.0Bright
226.0Bright
236.0Bright
246.0Bright
256.0Bright
266.0Bright
276.0Bright
286.0Bright
296.0Bright
306.0Bright
Planning a trip in September

Hazard calendar for Aveiro

In seasonPeak

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

Aveiro's rainy season runs December–May, when most of the year's rain falls.

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

Is September a good time to visit Aveiro?

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

3.3
Sightseeing
4th-best month of the year
5.6
Beach & pool
3rd-best month of the year

September is a weaker month for outdoor sightseeing in Aveiro.

What to pack for Aveiro in September

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

In September, Aveiro sees daytime highs around 32°C and nights near 24°C. Pack light clothes and rain gear. Worth having: sun protection. About 15 days see rain.

light clothesrain gearsun protection

UV index in Aveiro in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September 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 Aveiro peaks around February 20 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near November 16 at about 9 (very high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highExtremeVery highExtremeFeb 20UV 15Nov 16UV 9
UV index (midday)Level
Jan14Extreme
Feb15Extreme
Mar15Extreme
Apr14Extreme
May11Extreme
Jun10Very high
Jul10Very high
Aug10Extreme
Sep11Extreme
Oct11Extreme
Nov9Very high
Dec11Extreme

Air quality in Aveiro 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 Aveiro is worst in October — around 55 µg/m³ PM2.5 (poor), about 5.7× the cleanest month (June, 10 µg/m³).

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

0204060JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodModeratePoorModerateOct 2053 µg/m³Jun 1710 µg/m³
PM2.5 (µg/m³)Level
Jan15Moderate
Feb14Moderate
Mar14Moderate
Apr13Moderate
May11Good
Jun10Good
Jul11Good
Aug19Moderate
Sep36Poor
Oct55Poor
Nov48Poor
Dec24Moderate
Location & terrain

Where is Aveiro?

Aveiro sits at 3.6°S, 55.3°W, 18 m above sea level, in Brazil. The nearest listed city is Rurópolis, 72 km away.

Topography around Aveiro

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

Within 3 km, the terrain around Aveiro has only modest variations in elevation — a maximum elevation change of 65 m around an average of 21 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 244 m; within 80 km, significant variations in elevation — a maximum elevation change of 377 m.

The land around Aveiro is covered by water (46%) and trees (44%) within 3 km, trees (73%) and water (22%) within 16 km, and trees (87%) within 80 km.

3 km
65 m
16 km
244 m
80 km
377 m
treesgrasslandartificial surfaceswaterwetland
September weather nearby: Rurópolis 72 km · Itaituba 104 km · Belterra 116 km · Placas 127 km · Trairão 127 km · Mojuí dos Campos 128 km · Santarém 147 km · Uruará 177 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 Aveiro (-3.6056°, -55.3317°, elevation 18 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).