Arcos weather in September

In September, Arcos sees average daytime highs of 29°C and overnight lows near 17°C, with 46 mm of rain across 6.7 wet days and about 11.9 hours of daylight. It is the 3rd-warmest and 8th-wettest month of the year here.

Day-to-day highs hold fairly steady near 29°C through the month. The sky is clear or mostly clear about 49% of the time in September, and the air most often feels dry.

Daylight stretches from about 11 h 36 min at the start of September to 12 h 12 min by month's end. Set against the rest of the year, September is Arcos's 4th-clearest and 1st-windiest month. For the whole year in context, see Arcos's year-round climate.

Daytime high
29°
3rd warmest
Overnight low
17°
5th coldest
Rainfall
46 mm
6.7 wet days
Daylight
11 h 54 min
7:00 AM – 6:53 PM
Cloud cover
44%
4th clearest
Wind
9 km/h
1st windiest
Solar energy
5.67 kWh/m²
Travel score
6.4
out of 10

Arcos 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 29°C through the month.

A typical September day in Arcos reaches about 29°C in the afternoon and slips back to 17°C overnight — a 12°C spread between the day's warmth and the night's chill. On most days the high lands between 24°C and 32°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)
12816
22816
32816
42816
52816
62816
72816
82816
92816
102916
112916
122916
132917
142917
152917
162917
172917
182917
192917
202917
212917
222917
232917
242917
252917
262917
272917
282918
292918
302918

Arcos weather by month

How September compares with the rest of the year at a glance. September is the 3rd-warmest and 8th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan28° / 20°24121.313.14.2
Feb29° / 20°14016.312.74.5
Mar28° / 19°15918.812.14.8
Apr27° / 18°579.311.56.6
May25° / 15°345.111.17.7
Jun25° / 14°122.110.88.5
Jul25° / 13°71.310.98.7
Aug27° / 14°11211.38.2
Sep29° / 17°466.711.96.4
Oct29° / 19°8411.612.55.2
Nov28° / 19°18419.2134.7
Dec28° / 20°24723.913.24.3

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 49% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 15% of September, with mostly cloudy or overcast conditions the remaining 36%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
17723
27723
37525
47525
57525
67327
77327
87228
97129
107030
116832
126733
136634
146535
156436
166337
176139
186040
195941
205941
215842
225743
235644
245545
255446
265446
275347
285347
295248
305248

Chance of precipitation in September

Any precipitation

Arcos gets around 46 mm of rain over 6.7 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 22% and peaks near 33% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%40%151015202530
Rain chance (%)
112
212
313
413
514
614
715
816
916
1017
1118
1219
1320
1420
1521
1622
1723
1824
1925
2026
2127
2228
2329
2430
2531
2631
2732
2832
2933
3033

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 43% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
1632980
2632980
3622990
46129100
56029110
65929120
75829130
85629141
95430151
105330161
115131171
124931181
134732192
144533202
154333212
164134223
173934233
183835243
193635264
203535274
213335285
223234295
233134306
243033316
252932327
262831338
272730349
282629369
2925293610
3024283711

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 11 h 36 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 36 minutes over September. Sunrise moves from 7:14 AM to 6:47 AM, and sunset from 6:50 PM to 6:56 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
111.67:146:50
211.67:136:50
311.67:126:50
411.77:116:50
511.77:106:51
611.77:096:51
711.77:096:51
811.77:086:51
911.77:076:52
1011.87:066:52
1111.87:056:52
1211.87:046:52
1311.87:036:52
1411.87:026:53
1511.97:016:53
1611.97:006:53
1711.96:596:53
1811.96:586:54
1911.96:576:54
2012.06:566:54
2112.06:556:54
2212.06:546:54
2312.06:536:55
2412.06:526:55
2512.16:516:55
2612.16:506:55
2712.16:496:56
2812.16:486:56
2912.16:476:56
3012.26:476:56

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.67 kWh/m².

For context, solar energy here swings from a low near 3.99 kWh/m² to a high of 5.92 kWh/m² in October across the year — September's 5.67 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.5Bright
25.6Bright
35.6Bright
45.6Bright
55.6Bright
65.6Bright
75.6Bright
85.7Bright
95.7Bright
105.7Bright
115.7Bright
125.7Bright
135.7Bright
145.7Bright
155.7Bright
165.7Bright
175.7Bright
185.7Bright
195.7Bright
205.7Bright
215.7Bright
225.7Bright
235.7Bright
245.7Bright
255.7Bright
265.7Bright
275.7Bright
285.7Bright
295.7Bright
305.7Bright
Planning a trip in September

Hazard calendar for Arcos

In seasonPeak

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

Arcos's monsoon runs November–March, 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 Arcos?

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

6.4
Sightseeing
6th-best month of the year
7.7
Beach & pool
3rd-best month of the year

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

What to pack for Arcos in September

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

In September, Arcos sees daytime highs around 29°C and nights near 17°C. Pack light clothes. Worth having: sun protection. About 7 days see rain.

light clothessun protection

UV index in Arcos in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 10 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Arcos peaks around January 21 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 20 at about 7 (high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highHighVery highExtremeJan 21UV 15Jun 20UV 7
UV index (midday)Level
Jan16Extreme
Feb15Extreme
Mar13Extreme
Apr10Extreme
May8Very high
Jun7High
Jul7High
Aug9Very high
Sep10Very high
Oct12Extreme
Nov14Extreme
Dec14Extreme

Air quality in Arcos 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 Arcos is worst in September — around 20 µg/m³ PM2.5 (moderate), about 2.8× the cleanest month (November, 7 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodSep 1719 µg/m³Nov 237 µg/m³
PM2.5 (µg/m³)Level
Jan8Good
Feb8Good
Mar8Good
Apr8Good
May8Good
Jun8Good
Jul7Good
Aug10Good
Sep20Moderate
Oct12Good
Nov7Good
Dec7Good
Location & terrain

Where is Arcos?

Arcos sits at 20.3°S, 45.5°W, 737 m above sea level, in Brazil. The nearest listed city is Formiga, 23 km away.

Topography around Arcos

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

Within 3 km, the terrain around Arcos has only modest variations in elevation — a maximum elevation change of 130 m around an average of 753 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 405 m; within 80 km, large variations in elevation — a maximum elevation change of 791 m.

The land around Arcos is covered by trees (32%), grassland (31%) and artificial surfaces (28%) within 3 km, trees (42%) and grassland (38%) within 16 km, and grassland (52%) and trees (30%) within 80 km.

3 km
130 m
16 km
405 m
80 km
791 m
treesshrubsgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Formiga 23 km · Lagoa da Prata 29 km · Santo Antônio do Monte 34 km · Água Rasa 42 km · Itapecerica 48 km · Piumhi 48 km · Bambuí 55 km · Luz 56 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 Arcos (-20.2819°, -45.5394°, elevation 737 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).