Cerro Azul weather in September

In September, Cerro Azul sees average daytime highs of 24°C and overnight lows near 13°C, with 109 mm of rain across 10.2 wet days and about 11.8 hours of daylight. It is the 8th-warmest and 7th-wettest month of the year here.

Day-to-day highs hold fairly steady near 24°C through the month. The sky is clear or mostly clear about 30% of the time in September, and the air most often feels comfortable.

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 Cerro Azul's 6th-clearest and 3rd-windiest month. For the whole year in context, see Cerro Azul's year-round climate.

Daytime high
24°
8th warmest
Overnight low
13°
5th coldest
Rainfall
109 mm
10.2 wet days
Daylight
11 h 54 min
7:16 AM – 7:07 PM
Cloud cover
64%
6th clearest
Wind
7 km/h
3rd windiest
Solar energy
4.35 kWh/m²
Travel score
6.8
out of 10

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 24°C through the month.

A typical September day in Cerro Azul reaches about 24°C in the afternoon and slips back to 13°C overnight — a 11°C spread between the day's warmth and the night's chill. On most days the high lands between 17°C and 31°C. Set against its neighbours, September runs about 1°C warmer than August and about 1°C cooler than October.

10°20°30°151015202530
Avg high (°C)Avg low (°C)
12412
22412
32412
42413
52413
62413
72413
82413
92413
102413
112413
122413
132413
142413
152413
162413
172413
182413
192413
202414
212414
222414
232414
242414
252414
262414
272414
282414
292414
302414

Cerro Azul weather by month

How September compares with the rest of the year at a glance. September is the 8th-warmest and 7th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan28° / 19°21822.113.44.2
Feb28° / 19°16819.312.94.4
Mar27° / 18°13317.712.25.3
Apr26° / 16°649.211.46.7
May22° / 13°798.510.86.9
Jun21° / 11°787.810.56.9
Jul21° / 10°717.210.67.0
Aug23° / 11°576.811.17.4
Sep24° / 13°10910.211.86.8
Oct25° / 15°1201412.65.9
Nov26° / 16°11915.213.25.6
Dec28° / 18°15518.213.54.9

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 30% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 10% of September, with mostly cloudy or overcast conditions the remaining 59%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15644
25545
35347
45248
55149
65050
74852
84753
94555
104456
114258
124258
134258
144159
154159
163961
173862
183862
193862
203763
213664
223565
233466
243268
253268
263268
273169
283070
293070
303070

Chance of precipitation in September

Any precipitation

Cerro Azul gets around 109 mm of rain over 10.2 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 33% and peaks near 42% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%40%50%151015202530
Rain chance (%)
126
226
327
427
527
628
728
829
929
1030
1130
1231
1331
1431
1532
1633
1733
1834
1935
2036
2137
2238
2338
2439
2540
2640
2741
2841
2942
3042

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the comfortable 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 (%)
13846151
23846161
33745171
43745181
53744181
63644191
73644191
83544201
93544201
103444202
113344212
123344212
133245212
143145222
153045222
163045233
172945233
182945243
192844243
202844253
212843263
222742273
232741284
242640304
252639314
262538324
272537335
282437345
292436355
302335366

Wind in September

Winds average 7 km/h in September.

Across September, daily wind ranges from about 6 km/h on the calmest days to 7 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (km/h)Feels
16calm
26calm
36calm
46calm
57calm
67calm
77calm
87calm
97calm
107calm
117calm
127calm
137calm
147calm
157calm
167calm
177calm
187calm
197calm
207calm
217calm
227calm
237calm
247calm
257calm
267calm
277calm
287calm
297calm
307calm

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 7:32 AM to 7:00 AM, and sunset from 7:01 PM to 7:13 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
111.57:327:01
211.57:317:02
311.57:307:02
411.67:297:03
511.67:287:03
611.67:277:03
711.67:267:04
811.77:257:04
911.77:237:04
1011.77:227:05
1111.77:217:05
1211.87:207:06
1311.87:197:06
1411.87:187:06
1511.87:177:07
1611.97:167:07
1711.97:157:07
1811.97:137:08
1911.97:127:08
2012.07:117:09
2112.07:107:09
2212.07:097:09
2312.07:087:10
2412.17:077:10
2512.17:067:10
2612.17:057:11
2712.17:037:11
2812.27:027:12
2912.27:017:12
3012.27:007:13

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.35 kWh/m².

For context, solar energy here swings from a low near 2.92 kWh/m² to a high of 5.65 kWh/m² in December across the year — September's 4.35 kWh/m² falls in the middle.

012345151015202530
Solar energy (kWh/m²)Level
14.4Bright
24.4Bright
34.4Bright
44.4Bright
54.4Bright
64.4Bright
74.4Bright
84.4Bright
94.4Bright
104.4Bright
114.4Bright
124.4Bright
134.4Bright
144.4Bright
154.4Bright
164.4Bright
174.4Bright
184.4Bright
194.4Bright
204.4Bright
214.4Bright
224.4Bright
234.4Bright
244.4Bright
254.4Bright
264.4Bright
274.4Bright
284.4Bright
294.4Bright
304.4Bright
Planning a trip in September

Is September a good time to visit Cerro Azul?

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

6.8
Sightseeing
5th-best month of the year
5.8
Beach & pool
2nd-best month of the year

September is a reasonable time to visit Cerro Azul for sightseeing.

What to pack for Cerro Azul in September

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

In September, Cerro Azul sees daytime highs around 24°C and nights near 13°C. Worth packing: light clothes and rain gear. About 10 days see rain.

light clothesrain gear

UV index in Cerro Azul in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 7 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Cerro Azul peaks around January 19 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 12 at about 5 (high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highHighExtremeJan 19UV 15Jul 12UV 5
UV index (midday)Level
Jan15Extreme
Feb14Extreme
Mar12Extreme
Apr9Very high
May7High
Jun6High
Jul5High
Aug7High
Sep7High
Oct11Extreme
Nov13Extreme
Dec14Extreme

Air quality in Cerro Azul 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 Cerro Azul is worst in September — around 17 µg/m³ PM2.5 (moderate), about 2.2× the cleanest month (March, 8 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodSep 1216 µg/m³Mar 108 µg/m³
PM2.5 (µg/m³)Level
Jan8Good
Feb8Good
Mar8Good
Apr9Good
May10Good
Jun10Good
Jul11Good
Aug15Moderate
Sep17Moderate
Oct11Good
Nov9Good
Dec8Good
Location & terrain

Where is Cerro Azul?

Cerro Azul sits at 24.8°S, 49.3°W, 317 m above sea level, in Brazil. The nearest listed city is Rio Branco do Sul, 41 km away.

Topography around Cerro Azul

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

Within 3 km, the terrain around Cerro Azul has significant variations in elevation — a maximum elevation change of 320 m around an average of 398 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 1,029 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,785 m.

The land around Cerro Azul is covered by trees (56%) and grassland (39%) within 3 km, trees (73%) and grassland (26%) within 16 km, and trees (80%) within 80 km.

3 km
320 m
16 km
1,029 m
80 km
1,785 m
treesgrasslandcroplandartificial surfaces
September weather nearby: Rio Branco do Sul 41 km · Itaperuçu 45 km · Colombo 52 km · Apiaí 55 km · Almirante Tamandaré 56 km · Campina Grande do Sul 57 km · Quatro Barras 63 km · Campo Magro 64 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 Cerro Azul (-24.8236°, -49.2611°, elevation 317 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).