São Caetano de Odivelas weather in September

In September, São Caetano de Odivelas sees average daytime highs of 30°C and overnight lows near 26°C, with 13 mm of rain across 3.6 wet days and about 12 hours of daylight. It is the 3rd-warmest and 11th-wettest month of the year here.

Day-to-day highs hold fairly steady near 30°C through the month. The sky is clear or mostly clear about 65% 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 São Caetano de Odivelas's 1st-clearest and 2nd-windiest month. For the whole year in context, see São Caetano de Odivelas's year-round climate.

Daytime high
30°
3rd warmest
Overnight low
26°
10th coldest
Rainfall
13 mm
3.6 wet days
Daylight
12 hours
6:07 AM – 6:06 PM
Cloud cover
38%
1st clearest
Wind
19 km/h
2nd windiest
Solar energy
6.26 kWh/m²
Travel score
6.2
out of 10

São Caetano de Odivelas 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 30°C through the month.

A typical September day in São Caetano de Odivelas reaches about 30°C in the afternoon and slips back to 26°C overnight — a 4°C spread between the day's warmth and the night's chill. On most days the high lands between 29°C and 30°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)
13025
23025
33025
43025
53025
63025
73025
83025
93026
103026
113026
123026
133026
143026
153026
163026
173026
183026
193026
203026
213026
223026
233026
243026
253026
263026
273026
283026
293026
303026

How September really feels in São Caetano de Odivelas

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.

São Caetano de Odivelas weather by month

How September compares with the rest of the year at a glance. September is the 3rd-warmest and 11th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan28° / 25°26228.1123.5
Feb28° / 25°35827.1123.4
Mar28° / 25°46130.6123.3
Apr28° / 25°41229.5123.2
May28° / 25°28327.8123.4
Jun29° / 25°12823.5123.9
Jul29° / 25°8220.3124.5
Aug29° / 25°3310.7125.5
Sep30° / 26°133.6126.2
Oct30° / 26°123.3126.1
Nov30° / 26°235.8125.6
Dec29° / 25°9216.6124.6

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 65% of the time in September, the clearest month of the year.

Beyond those clear spells, partly cloudy skies cover about 24% of September, with mostly cloudy or overcast conditions the remaining 11%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
18911
28911
39010
49010
59010
69010
79010
8919
9919
10919
11919
12919
13919
149010
159010
169010
179010
188911
198911
208911
218812
228812
238713
248713
258713
268614
278614
288515
298515
308416

Chance of precipitation in September

Any precipitation

São Caetano de Odivelas gets around 13 mm of rain over 3.6 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 12% and peaks near 19% on the wettest days. The odds ease toward the end of the month.

0%10%20%30%151015202530
Rain chance (%)
119
218
317
417
516
615
715
814
914
1014
1113
1213
1313
1412
1512
1611
1711
1811
1910
2010
2110
2210
239
249
259
269
279
289
299
309

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 99% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202530
Oppressive (%)Miserable (%)
1982
2982
3982
4991
5991
6991
7991
8991
9991
10991
11991
12991
13991
14991
15991
16991
17991
18991
19991
20991
21991
22991
23991
24991
25991
26991
27991
28991
29991
30991

Wind in September

Winds average 19 km/h in September.

Across September, daily wind ranges from about 18 km/h on the calmest days to 19 km/h at its breeziest. It stays fairly steady from day to day.

0510152025151015202530
Wind speed (km/h)Feels
118light breeze
218light breeze
318light breeze
418light breeze
518light breeze
618light breeze
718light breeze
818light breeze
918light breeze
1018light breeze
1119light breeze
1219light breeze
1319light breeze
1419light breeze
1519light breeze
1619light breeze
1719light breeze
1819light breeze
1919light breeze
2019light breeze
2119light breeze
2219light breeze
2319light breeze
2419light breeze
2519light breeze
2619light breeze
2719light breeze
2819light breeze
2919light breeze
3019light breeze

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 6:12 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)
112.06:126:11
212.06:126:11
312.06:126:11
412.06:116:10
512.06:116:10
612.06:106:10
712.06:106:09
812.06:106:09
912.06:096:09
1012.06:096:08
1112.06:086:08
1212.06:086:08
1312.06:086:07
1412.06:076:07
1512.06:076:07
1612.06:076:06
1712.06:066:06
1812.06:066:06
1912.06:056:05
2012.06:056:05
2112.06:056:05
2212.06:046:04
2312.06:046:04
2412.06:036:04
2512.06:036:03
2612.06:036:03
2712.06:026:03
2812.06:026:02
2912.06:026:02
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 6.26 kWh/m².

For context, solar energy here swings from a low near 4.16 kWh/m² to a high of 6.36 kWh/m² in October across the year — September's 6.26 kWh/m² sits near the top of that range.

0246151015202530
Solar energy (kWh/m²)Level
16.1Intense
26.1Intense
36.1Intense
46.1Intense
56.1Intense
66.2Intense
76.2Intense
86.2Intense
96.2Intense
106.2Intense
116.2Intense
126.2Intense
136.2Intense
146.2Intense
156.3Intense
166.3Intense
176.3Intense
186.3Intense
196.3Intense
206.3Intense
216.3Intense
226.3Intense
236.3Intense
246.3Intense
256.3Intense
266.3Intense
276.3Intense
286.4Intense
296.4Intense
306.4Intense
Planning a trip in September

Hazard calendar for São Caetano de Odivelas

In seasonPeak

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

São Caetano de Odivelas'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 São Caetano de Odivelas?

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

6.2
Sightseeing
1st-best month of the year
8.3
Beach & pool
1st-best month of the year

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

What to pack for São Caetano de Odivelas in September

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

In September, São Caetano de Odivelas sees daytime highs around 30°C and nights near 26°C. Pack light clothes and sun protection. About 4 days see rain.

light clothessun protection

Sea temperature near São Caetano de Odivelas in September

The nearest coast averages about 28°C in September — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 18 km away) is warmest in June at about 29°C and coldest in February near 28°C.

The water stays above 20°C all year — warm enough for a swim any month.

26°28°30°JanFebMarAprMayJunJulAugSepOctNovDecwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan28Tropical
Feb28Tropical
Mar28Tropical
Apr28Tropical
May29Tropical
Jun29Tropical
Jul29Tropical
Aug29Tropical
Sep28Tropical
Oct28Tropical
Nov28Tropical
Dec29Tropical

UV index in São Caetano de Odivelas 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 São Caetano de Odivelas peaks around March 15 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 24 at about 10 (extreme).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeMar 15UV 15Jul 24UV 10
UV index (midday)Level
Jan13Extreme
Feb15Extreme
Mar15Extreme
Apr14Extreme
May12Extreme
Jun11Extreme
Jul10Extreme
Aug10Extreme
Sep12Extreme
Oct12Extreme
Nov10Extreme
Dec11Extreme

Air quality in São Caetano de Odivelas 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 São Caetano de Odivelas is worst in February — around 23 µg/m³ PM2.5 (moderate), about 3.0× the cleanest month (July, 8 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodModerateFeb 2023 µg/m³Jul 148 µg/m³
PM2.5 (µg/m³)Level
Jan18Moderate
Feb23Moderate
Mar22Moderate
Apr17Moderate
May10Good
Jun8Good
Jul8Good
Aug9Good
Sep11Good
Oct12Moderate
Nov16Moderate
Dec16Moderate
Location & terrain

Where is São Caetano de Odivelas?

São Caetano de Odivelas sits at 0.8°S, 48.0°W, 8 m above sea level, in Brazil. The nearest listed city is Vigia, 18 km away.

Topography around São Caetano de Odivelas

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of São Caetano de Odivelas.

Within 3 km, the terrain around São Caetano de Odivelas has only modest variations in elevation — a maximum elevation change of 33 m around an average of 16 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 56 m; within 80 km, only modest variations in elevation — a maximum elevation change of 68 m.

The land around São Caetano de Odivelas is covered by mangroves (53%) and trees (25%) within 3 km, trees (44%), water (28%) and mangroves (21%) within 16 km, and water (42%) and trees (37%) within 80 km.

3 km
33 m
16 km
56 m
80 km
68 m
treesgrasslandartificial surfaceswaterwetlandmangroves
September weather nearby: Vigia 18 km · Curuçá 19 km · Marapanim 36 km · Santo Antônio do Tauá 46 km · Salvaterra 55 km · Soure 56 km · Santa Bárbara do Pará 61 km · Igarapé-Açu 61 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 São Caetano de Odivelas (-0.75°, -48.02°, elevation 8 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. Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. 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).