Santa Inês weather in September

In September, Santa Inês sees average daytime highs of 35°C and overnight lows near 24°C, with 12 mm of rain across 2.2 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 35°C through the month. The sky is clear or mostly clear about 60% 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 Santa Inês's 2nd-clearest and 2nd-windiest month. For the whole year in context, see Santa Inês's year-round climate.

Daytime high
35°
2nd warmest
Overnight low
24°
9th coldest
Rainfall
12 mm
2.2 wet days
Daylight
12 hours
5:56 AM – 5:55 PM
Cloud cover
39%
2nd clearest
Wind
10 km/h
2nd windiest
Solar energy
6.02 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 35°C through the month.

A typical September day in Santa Inês reaches about 35°C in the afternoon and slips back to 24°C overnight — a 11°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 about 1°C warmer than August and on par with October.

20°25°30°35°40°151015202530
Avg high (°C)Avg low (°C)
13424
23424
33424
43524
53524
63524
73524
83524
93524
103524
113524
123524
133524
143524
153524
163524
173524
183524
193524
203524
213524
223524
233524
243524
253524
263524
273524
283524
293524
303524

How September really feels in Santa Inês

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
22 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.

Santa Inês 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
Jan32° / 24°25325.412.22.6
Feb31° / 24°27625.712.12.5
Mar31° / 24°34129.5122.4
Apr31° / 24°31027.911.92.5
May31° / 24°16321.511.83.2
Jun31° / 23°5511.711.84.2
Jul32° / 23°326.411.84.4
Aug34° / 23°122.811.93.8
Sep35° / 24°122.2123.2
Oct35° / 25°194.112.12.9
Nov34° / 25°49812.22.9
Dec33° / 24°12015.412.22.8

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 60% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 27% of September, with mostly cloudy or overcast conditions the remaining 12%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
19010
28911
38911
48911
58911
68812
78812
88812
98812
108812
118812
128812
138812
148812
158812
168812
178713
188713
198713
208713
218812
228812
238812
248812
258713
268614
278614
288614
298515
308515

Chance of precipitation in September

Any precipitation

Santa Inês gets around 12 mm of rain over 2.2 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 8% and peaks near 10% on the wettest days.

0%10%20%30%151015202530
Rain chance (%)
18
28
38
47
57
67
77
87
97
107
117
127
137
147
157
167
177
187
197
208
218
228
238
249
259
269
279
2810
2910
3010

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 84% of days. Sticky, muggy-or-worse air turns up on roughly 99% of them.

0%25%50%75%100%151015202530
Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1114841
2115831
3115831
4116821
5117811
6117811
7118801
8119800
9119800
10119800
11119800
12119800
13119800
14118810
15118810
16117820
17117820
18116830
19115840
20115840
21114850
22014860
23013870
24013870
25012880
26012880
27012880
28012880
29012880
30012880

Wind in September

Winds average 10 km/h in September.

Across September, daily wind ranges from about 9 km/h on the calmest days to 10 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
810calm
910calm
1010calm
1110calm
1210calm
1310calm
1410calm
1510calm
1610calm
1710calm
1810calm
1910calm
2010calm
2110calm
2210calm
2310calm
2410calm
2510calm
2610calm
2710calm
2810calm
2910calm
3010calm

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 6:03 AM to 5:50 AM, and sunset from 5:59 PM to 5:52 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
111.96:035:59
211.96:035:59
311.96:025:59
411.96:025:58
511.96:025:58
611.96:015:58
711.96:015:58
812.06:005:57
912.06:005:57
1012.05:595:57
1112.05:595:57
1212.05:585:56
1312.05:585:56
1412.05:575:56
1512.05:575:56
1612.05:565:55
1712.05:565:55
1812.05:555:55
1912.05:555:54
2012.05:555:54
2112.05:545:54
2212.05:545:54
2312.05:535:53
2412.05:535:53
2512.05:525:53
2612.05:525:53
2712.05:515:52
2812.05:515:52
2912.05:505:52
3012.05:505:52

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 6.02 kWh/m².

For context, solar energy here swings from a low near 4.26 kWh/m² to a high of 6.11 kWh/m² in October across the year — September's 6.02 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
96.0Bright
106.0Bright
116.0Bright
126.0Bright
136.0Intense
146.0Intense
156.0Intense
166.0Intense
176.0Intense
186.0Intense
196.1Intense
206.1Intense
216.1Intense
226.1Intense
236.1Intense
246.1Intense
256.1Intense
266.1Intense
276.1Intense
286.1Intense
296.1Intense
306.2Intense
Planning a trip in September

Hazard calendar for Santa Inês

In seasonPeak

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

Santa Inês'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 Santa Inês?

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

3.2
Sightseeing
4th-best month of the year
6.8
Beach & pool
3rd-best month of the year

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

What to pack for Santa Inês in September

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

In September, Santa Inês sees daytime highs around 35°C and nights near 24°C. Pack light clothes and sun protection.

light clothessun protection

UV index in Santa Inês 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 Santa Inês peaks around March 17 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 17 at about 10 (extreme).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeMar 17UV 15Jul 17UV 10
UV index (midday)Level
Jan13Extreme
Feb14Extreme
Mar16Extreme
Apr14Extreme
May11Extreme
Jun10Extreme
Jul10Very high
Aug10Extreme
Sep12Extreme
Oct12Extreme
Nov11Extreme
Dec11Extreme

Air quality in Santa Inês 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 Santa Inês is worst in November — around 25 µg/m³ PM2.5 (moderate), about 3.5× the cleanest month (July, 7 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodModerateNov 1724 µg/m³Jul 167 µg/m³
PM2.5 (µg/m³)Level
Jan15Moderate
Feb15Moderate
Mar15Moderate
Apr13Moderate
May10Good
Jun8Good
Jul7Good
Aug8Good
Sep10Good
Oct16Moderate
Nov25Moderate
Dec19Moderate
Location & terrain

Where is Santa Inês?

Santa Inês sits at 3.7°S, 45.4°W, 31 m above sea level, in Brazil. The nearest listed city is Pindaré-Mirim, 8.0 km away.

Topography around Santa Inês

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

Within 3 km, the terrain around Santa Inês has only modest variations in elevation — a maximum elevation change of 32 m around an average of 22 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 52 m; within 80 km, significant variations in elevation — a maximum elevation change of 286 m.

The land around Santa Inês is covered by grassland (43%), artificial surfaces (32%) and trees (23%) within 3 km, grassland (56%) and trees (32%) within 16 km, and grassland (60%) and trees (34%) within 80 km.

3 km
32 m
16 km
52 m
80 km
286 m
treesgrasslandcroplandartificial surfacesbare terrainwaterwetland
September weather nearby: Pindaré-Mirim 8.0 km · Monção 24 km · Bom Jardim 29 km · Pio XII 31 km · Santa Luzia 45 km · Penalva 47 km · Alto Alegre do Pindaré 52 km · Zé Doca 53 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 Santa Inês (-3.6667°, -45.38°, elevation 31 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).