Monte Sião weather in September

In September, Monte Sião sees average daytime highs of 27°C and overnight lows near 15°C, with 75 mm of rain across 8.5 wet days and about 11.9 hours of daylight. It is the 7th-warmest and 7th-wettest month of the year here.

Day-to-day highs hold fairly steady near 27°C through the month. The sky is clear or mostly clear about 50% of the time in September, and the air most often feels dry.

Daylight stretches from about 11 h 30 min at the start of September to 12 h 12 min by month's end. Set against the rest of the year, September is Monte Sião's 4th-clearest and 1st-windiest month. For the whole year in context, see Monte Sião's year-round climate.

Daytime high
27°
7th warmest
Overnight low
15°
5th coldest
Rainfall
75 mm
8.5 wet days
Daylight
11 h 54 min
7:04 AM – 6:57 PM
Cloud cover
45%
4th clearest
Wind
9 km/h
1st windiest
Solar energy
5.39 kWh/m²
Travel score
7.1
out of 10

Monte Sião 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 27°C through the month.

A typical September day in Monte Sião reaches about 27°C in the afternoon and slips back to 15°C overnight — a 11°C spread between the day's warmth and the night's chill. On most days the high lands between 21°C and 31°C. Set against its neighbours, September runs about 2°C warmer than August and on par with October.

10°15°20°25°30°35°151015202530
Avg high (°C)Avg low (°C)
12614
22615
32615
42615
52615
62715
72715
82715
92715
102715
112715
122715
132716
142716
152716
162716
172716
182716
192716
202716
212616
222616
232616
242616
252616
262616
272616
282616
292616
302616

Monte Sião weather by month

How September compares with the rest of the year at a glance. September is the 7th-warmest and 7th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan27° / 19°23522.513.24.5
Feb28° / 19°16918.812.84.8
Mar27° / 18°12918.112.25.3
Apr26° / 16°619.111.57.0
May23° / 14°536.110.97.7
Jun23° / 13°354.110.78.1
Jul23° / 12°313.410.88.4
Aug25° / 13°263.811.28.4
Sep27° / 15°758.511.97.1
Oct27° / 17°10413.412.56.0
Nov27° / 18°14416.813.15.4
Dec27° / 19°19920.713.34.8

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 50% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 14% of September, with mostly cloudy or overcast conditions the remaining 35%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
17822
27723
37624
47624
57525
67327
77228
87228
97129
107030
116931
126832
136733
146634
156634
166436
176337
186337
196238
206139
215941
225842
235743
245743
255644
265446
275347
285347
295248
305248

Chance of precipitation in September

Any precipitation

Monte Sião gets around 75 mm of rain over 8.5 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 28% and peaks near 38% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%40%50%151015202530
Rain chance (%)
119
220
320
421
522
622
723
823
923
1024
1124
1225
1325
1425
1526
1627
1727
1828
1929
2030
2131
2233
2334
2435
2535
2636
2737
2837
2938
3038

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

Most of September feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, September lands in the dry band about 52% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
1722440
2712540
3702550
4682660
5682660
6662770
7652870
8632980
9613090
10603190
115931100
125732110
135633110
145434120
155335120
165136130
175037140
184837150
194737160
204538170
214437180
224337200
234237210
244037230
253937240
263837260
273636270
283536280
293436300
303336311

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 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
89calm
99calm
109calm
119calm
129calm
1310calm
1410calm
1510calm
1610calm
1710calm
1810calm
1910calm
2010calm
219calm
229calm
239calm
249calm
259calm
269calm
279calm
289calm
299calm
309calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 11 h 30 min at the start of September to 12 h 12 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 42 minutes over September. Sunrise moves from 7:20 AM to 6:50 AM, and sunset from 6:52 PM to 7:01 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
111.57:206:52
211.67:196:53
311.67:186:53
411.67:176:53
511.67:166:54
611.77:156:54
711.77:146:54
811.77:136:54
911.77:126:55
1011.77:116:55
1111.87:106:55
1211.87:096:56
1311.87:086:56
1411.87:076:56
1511.97:056:56
1611.97:046:57
1711.97:036:57
1811.97:026:57
1911.97:016:58
2012.07:006:58
2112.06:596:58
2212.06:586:59
2312.06:576:59
2412.06:566:59
2512.16:556:59
2612.16:547:00
2712.16:537:00
2812.16:527:00
2912.26:517:01
3012.26:507:01

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.39 kWh/m².

For context, solar energy here swings from a low near 3.74 kWh/m² to a high of 5.78 kWh/m² in November across the year — September's 5.39 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.3Bright
25.3Bright
35.3Bright
45.3Bright
55.3Bright
65.3Bright
75.3Bright
85.4Bright
95.4Bright
105.4Bright
115.4Bright
125.4Bright
135.4Bright
145.4Bright
155.4Bright
165.4Bright
175.4Bright
185.4Bright
195.4Bright
205.4Bright
215.4Bright
225.4Bright
235.4Bright
245.4Bright
255.4Bright
265.4Bright
275.4Bright
285.5Bright
295.5Bright
305.5Bright
Planning a trip in September

Hazard calendar for Monte Sião

In seasonPeak

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

Monte Sião's rainy season runs November–March, 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 Monte Sião?

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

7.1
Sightseeing
5th-best month of the year
6.9
Beach & pool
2nd-best month of the year

September is one of the better times to visit Monte Sião for general sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Monte Sião in September

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

In September, Monte Sião sees daytime highs around 27°C and nights near 15°C. Worth packing: light clothes, rain gear and sun protection. About 9 days see rain.

light clothesrain gearsun protection

UV index in Monte Sião in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 9 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Monte Sião peaks around January 24 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 10 at about 6 (high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highHighVery highExtremeJan 24UV 15Jul 10UV 6
UV index (midday)Level
Jan15Extreme
Feb15Extreme
Mar13Extreme
Apr10Very high
May7Very high
Jun6High
Jul6High
Aug8Very high
Sep9Very high
Oct12Extreme
Nov14Extreme
Dec14Extreme

Air quality in Monte Sião 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 Monte Sião is worst in September — around 27 µg/m³ PM2.5 (moderate), about 1.8× the cleanest month (December, 15 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateSep 1227 µg/m³Dec 1515 µg/m³
PM2.5 (µg/m³)Level
Jan15Moderate
Feb16Moderate
Mar18Moderate
Apr21Moderate
May24Moderate
Jun25Moderate
Jul26Moderate
Aug25Moderate
Sep27Moderate
Oct20Moderate
Nov15Moderate
Dec15Moderate
Location & terrain

Where is Monte Sião?

Monte Sião sits at 22.4°S, 46.6°W, 857 m above sea level, in Brazil. The nearest listed city is Águas de Lindóia, 8.0 km away.

Topography around Monte Sião

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

Within 3 km, the terrain around Monte Sião has significant variations in elevation — a maximum elevation change of 454 m around an average of 904 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 685 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,494 m.

The land around Monte Sião is covered by grassland (53%) and trees (30%) within 3 km, grassland (52%) and trees (36%) within 16 km, and grassland (40%) and trees (36%) within 80 km.

3 km
454 m
16 km
685 m
80 km
1,494 m
treesgrasslandcroplandartificial surfaces
September weather nearby: Águas de Lindóia 8.0 km · Jacutinga 17 km · Socorro 18 km · Serra Negra 24 km · Itapira 26 km · Ouro Fino 27 km · Espírito Santo do Pinhal 32 km · Amparo 36 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 Monte Sião (-22.4325°, -46.5725°, elevation 857 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).