Arinos weather in September

In September, Arinos sees average daytime highs of 33°C and overnight lows near 20°C, with 14 mm of rain across 2.1 wet days and about 11.9 hours of daylight. It is the 2nd-warmest and 8th-wettest month of the year here.

Day-to-day highs hold fairly steady near 33°C through the month. The sky is clear or mostly clear about 63% of the time in September, and the air most often feels dry.

Daylight stretches from about 11 h 42 min at the start of September to 12 h 06 min by month's end. Set against the rest of the year, September is Arinos's 3rd-clearest and 1st-windiest month. For the whole year in context, see Arinos's year-round climate.

Daytime high
33°
2nd warmest
Overnight low
20°
5th coldest
Rainfall
14 mm
2.1 wet days
Daylight
11 h 54 min
7:01 AM – 6:56 PM
Cloud cover
35%
3rd clearest
Wind
8 km/h
1st windiest
Solar energy
6.29 kWh/m²
Travel score
4.6
out of 10

Arinos 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 33°C through the month.

A typical September day in Arinos reaches about 33°C in the afternoon and slips back to 20°C overnight — a 13°C spread between the day's warmth and the night's chill. On most days the high lands between 30°C and 36°C. Set against its neighbours, September runs about 2°C warmer than August and on par with October.

15°20°25°30°35°40°151015202530
Avg high (°C)Avg low (°C)
13218
23218
33219
43219
53219
63219
73219
83219
93219
103219
113319
123319
133319
143320
153320
163320
173320
183320
193320
203320
213320
223320
233321
243321
253321
263321
273321
283321
293321
303321

How September really feels in Arinos

Once humidity and wind are folded in, September averages 27 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
27
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.

Arinos weather by month

How September compares with the rest of the year at a glance. September is the 2nd-warmest and 8th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan30° / 21°16316.412.84.0
Feb31° / 21°11913.612.54.1
Mar30° / 21°15015.412.14.2
Apr30° / 20°518.111.75.2
May30° / 19°122.411.36.3
Jun29° / 17°30.411.17.2
Jul29° / 16°00.111.17.3
Aug31° / 17°20.511.56.2
Sep33° / 20°142.111.94.6
Oct33° / 22°758.712.43.7
Nov30° / 21°18717.412.73.8
Dec30° / 21°2081912.93.9

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 63% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 13% of September, with mostly cloudy or overcast conditions the remaining 24%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
18416
28317
38317
48317
58317
68218
78218
88218
98218
108119
118020
128020
137921
147921
157822
167723
177624
187624
197525
207327
217327
227228
237129
247030
256931
266832
276733
286733
296634
306535

Chance of precipitation in September

Any precipitation

Arinos gets around 14 mm of rain over 2.1 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 7% and peaks near 18% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%151015202530
Rain chance (%)
13
23
33
43
53
63
73
83
93
103
113
124
134
144
155
166
176
187
198
209
2110
2211
2311
2412
2513
2614
2715
2816
2917
3018

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 50% of days. Sticky, muggy-or-worse air turns up on roughly 7% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
1652591
2652591
3662491
46524101
56524101
66524101
76524101
86524101
96324112
106324112
116125122
126125122
135926132
145627143
155627143
165328154
175029165
184830166
194630177
204331188
214131199
2239311910
2337312012
2435312113
2533312214
2632312215
2730312217
2829312318
2928302319
3027302320

Wind in September

Winds average 8 km/h in September, the windiest month of the year.

Across September, daily wind ranges from about 8 km/h on the calmest days to 8 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
18calm
28calm
38calm
48calm
58calm
68calm
78calm
88calm
98calm
108calm
118calm
128calm
138calm
148calm
158calm
168calm
178calm
188calm
198calm
208calm
218calm
228calm
238calm
248calm
258calm
268calm
278calm
288calm
298calm
308calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 11 h 42 min at the start of September to 12 h 06 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 24 minutes over September. Sunrise moves from 7:14 AM to 6:50 AM, and sunset from 6:55 PM to 6:58 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
111.77:146:55
211.77:136:55
311.77:126:55
411.77:116:55
511.77:106:55
611.87:106:55
711.87:096:55
811.87:086:55
911.87:076:55
1011.87:066:56
1111.87:066:56
1211.97:056:56
1311.97:046:56
1411.97:036:56
1511.97:026:56
1611.97:016:56
1711.97:016:56
1811.97:006:56
1912.06:596:56
2012.06:586:56
2112.06:576:57
2212.06:566:57
2312.06:566:57
2412.06:556:57
2512.06:546:57
2612.16:536:57
2712.16:526:57
2812.16:526:57
2912.16:516:57
3012.16:506:58

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 6.29 kWh/m².

For context, solar energy here swings from a low near 4.53 kWh/m² to a high of 6.36 kWh/m² in October across the year — September's 6.29 kWh/m² sits near the top of that range.

0246151015202530
Solar energy (kWh/m²)Level
16.0Intense
26.1Intense
36.1Intense
46.1Intense
56.2Intense
66.2Intense
76.2Intense
86.2Intense
96.3Intense
106.3Intense
116.3Intense
126.3Intense
136.3Intense
146.3Intense
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 Arinos

In seasonPeak

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

Arinos'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 Arinos?

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

4.6
Sightseeing
6th-best month of the year
7.8
Beach & pool
5th-best month of the year

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

What to pack for Arinos in September

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

In September, Arinos sees daytime highs around 33°C and nights near 20°C. Pack light clothes and sun protection.

light clothessun protection

UV index in Arinos 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 Arinos peaks around February 14 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 10 at about 8 (very high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highExtremeFeb 14UV 15Jul 10UV 8
UV index (midday)Level
Jan15Extreme
Feb16Extreme
Mar14Extreme
Apr12Extreme
May9Very high
Jun8Very high
Jul8Very high
Aug10Very high
Sep12Extreme
Oct13Extreme
Nov14Extreme
Dec13Extreme
Location & terrain

Where is Arinos?

Arinos sits at 15.9°S, 46.1°W, 517 m above sea level, in Brazil. The nearest listed city is Urucuia, 46 km away.

Topography around Arinos

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

Within 3 km, the terrain around Arinos has only modest variations in elevation — a maximum elevation change of 47 m around an average of 514 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 452 m; within 80 km, significant variations in elevation — a maximum elevation change of 541 m.

The land around Arinos is covered by grassland (41%), shrubs (23%) and trees (20%) within 3 km, shrubs (34%), grassland (31%) and trees (27%) within 16 km, and shrubs (37%), grassland (29%) and trees (20%) within 80 km.

3 km
47 m
16 km
452 m
80 km
541 m
treesshrubsgrasslandcroplandartificial surfaceswater
September weather nearby: Urucuia 46 km · Buritis 48 km · Unaí 99 km · Brasilândia de Minas 122 km · São Francisco 133 km · Formosa 138 km · Paracatu 167 km · Planaltina 168 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 Arinos (-15.9169°, -46.1056°, elevation 517 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. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).