Nova Petrópolis weather in September

In September, Nova Petrópolis sees average daytime highs of 21°C and overnight lows near 12°C, with 177 mm of rain across 12.9 wet days and about 11.8 hours of daylight. It is the 8th-warmest and 5th-wettest month of the year here.

Day-to-day highs hold fairly steady near 21°C through the month. The sky is clear or mostly clear about 31% of the time in September, and the air most often feels dry.

Daylight stretches from about 11 h 24 min at the start of September to 12 h 12 min by month's end. Set against the rest of the year, September is Nova Petrópolis's 11th-clearest and 2nd-windiest month. For the whole year in context, see Nova Petrópolis's year-round climate.

Daytime high
21°
8th warmest
Overnight low
12°
5th coldest
Rainfall
177 mm
12.9 wet days
Daylight
11 h 48 min
7:24 AM – 7:14 PM
Cloud cover
62%
11th clearest
Wind
8 km/h
2nd windiest
Solar energy
4.11 kWh/m²
Travel score
6.0
out of 10

Nova Petrópolis is 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 21°C through the month.

A typical September day in Nova Petrópolis reaches about 21°C in the afternoon and slips back to 12°C overnight — a 10°C spread between the day's warmth and the night's chill. On most days the high lands between 16°C and 28°C. Set against its neighbours, September runs about 1°C warmer than August and about 2°C cooler than October.

10°20°30°151015202530
Avg high (°C)Avg low (°C)
12111
22111
32111
42111
52111
62111
72111
82111
92111
102111
112111
122111
132111
142111
152111
162112
172112
182112
192112
202112
212112
222112
232112
242112
252212
262212
272212
282212
292212
302212

Nova Petrópolis weather by month

How September compares with the rest of the year at a glance. September is the 8th-warmest and 5th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan28° / 18°21018.113.75.2
Feb28° / 18°17917.113.15.2
Mar26° / 17°16015.212.25.9
Apr24° / 15°13311.611.36.6
May20° / 11°1381110.56.2
Jun19° / 10°1341110.25.9
Jul18° / 17111.310.35.9
Aug20° / 10°1421110.96.3
Sep21° / 12°17712.911.86.0
Oct23° / 14°21715.212.76.0
Nov25° / 15°15813.713.56.2
Dec27° / 17°17815.213.85.7

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 31% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 12% of September, with mostly cloudy or overcast conditions the remaining 57%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14852
24753
34654
44555
54555
64357
74357
84258
94357
104357
114357
124258
134456
144357
154357
164357
174357
184456
194456
204357
214357
224357
234357
244258
254258
264159
274060
284060
293961
303862

Chance of precipitation in September

Any precipitation

Nova Petrópolis gets around 177 mm of rain over 12.9 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 43% and peaks near 48% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%151015202530
Rain chance (%)
136
236
337
438
538
639
739
840
941
1041
1141
1242
1342
1443
1544
1644
1745
1845
1945
2046
2146
2246
2346
2447
2547
2647
2748
2848
2948
3048

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 48% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
15430151
25330161
35330161
45230171
55230171
65131171
75131171
85131171
95031181
105032181
114932181
124832191
134832191
144732191
154732191
164732191
174732192
184732192
194732192
204732192
214731202
224731202
234631203
244630213
254630223
264530223
274530233
284429243
294329243
304329254

Wind in September

Winds average 8 km/h in September.

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 24 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 48 minutes over September. Sunrise moves from 7:43 AM to 7:06 AM, and sunset from 7:06 PM to 7:21 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
111.47:437:06
211.47:427:06
311.47:407:07
411.57:397:07
511.57:387:08
611.57:377:08
711.67:357:09
811.67:347:09
911.67:337:10
1011.67:327:10
1111.77:307:11
1211.77:297:11
1311.77:287:12
1411.87:277:12
1511.87:257:13
1611.87:247:14
1711.97:237:14
1811.97:217:15
1911.97:207:15
2011.97:197:16
2112.07:187:16
2212.07:167:17
2312.07:157:17
2412.17:147:18
2512.17:137:18
2612.17:117:19
2712.27:107:20
2812.27:097:20
2912.27:087:21
3012.27:067:21

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.11 kWh/m².

For context, solar energy here swings from a low near 2.45 kWh/m² to a high of 6.36 kWh/m² in December across the year — September's 4.11 kWh/m² falls in the middle.

012345151015202530
Solar energy (kWh/m²)Level
13.9Moderate
23.9Moderate
33.9Moderate
43.9Moderate
53.9Moderate
63.9Moderate
73.9Moderate
84.0Moderate
94.0Moderate
104.0Moderate
114.0Bright
124.0Bright
134.0Bright
144.1Bright
154.1Bright
164.1Bright
174.1Bright
184.2Bright
194.2Bright
204.2Bright
214.2Bright
224.3Bright
234.3Bright
244.3Bright
254.3Bright
264.3Bright
274.4Bright
284.4Bright
294.4Bright
304.4Bright
Planning a trip in September

Is September a good time to visit Nova Petrópolis?

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

6.0
Sightseeing
5th-best month of the year
3.9
Beach & pool
8th-best month of the year

September is a reasonable time to visit Nova Petrópolis for sightseeing.

What to pack for Nova Petrópolis in September

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

In September, Nova Petrópolis sees daytime highs around 21°C and nights near 12°C. Worth packing: rain gear. About 13 days see rain.

rain gear

UV index in Nova Petrópolis in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 8 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Nova Petrópolis peaks around January 16 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 21 at about 4 (moderate).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highModerateHighVery highExtremeJan 16UV 14Jun 21UV 4
UV index (midday)Level
Jan14Extreme
Feb13Extreme
Mar10Extreme
Apr8Very high
May5Moderate
Jun4Moderate
Jul4Moderate
Aug6High
Sep8Very high
Oct8Very high
Nov12Extreme
Dec13Extreme

Air quality in Nova Petrópolis 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 Nova Petrópolis is worst in August — around 22 µg/m³ PM2.5 (moderate), about 2.4× the cleanest month (February, 9 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodAug 1822 µg/m³Feb 149 µg/m³
PM2.5 (µg/m³)Level
Jan10Good
Feb9Good
Mar10Good
Apr11Good
May12Moderate
Jun12Good
Jul15Moderate
Aug22Moderate
Sep18Moderate
Oct12Good
Nov11Good
Dec10Good
Location & terrain

Where is Nova Petrópolis?

Nova Petrópolis sits at 29.4°S, 51.1°W, 589 m above sea level, in Brazil. The nearest listed city is Dois Irmãos, 23 km away.

Topography around Nova Petrópolis

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

Within 3 km, the terrain around Nova Petrópolis has significant variations in elevation — a maximum elevation change of 544 m around an average of 492 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 811 m; within 80 km, large variations in elevation — a maximum elevation change of 1,045 m.

The land around Nova Petrópolis is covered by trees (85%) within 3 km, trees (89%) within 16 km, and trees (63%) and grassland (24%) within 80 km.

3 km
544 m
16 km
811 m
80 km
1,045 m
treesgrasslandcroplandartificial surfaceswaterwetland
September weather nearby: Dois Irmãos 23 km · Gramado 23 km · Caxias do Sul 24 km · Ivoti 24 km · Farroupilha 28 km · Canela 29 km · Estância Velha 31 km · Nova Hartz 31 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 Nova Petrópolis (-29.3764°, -51.1144°, elevation 589 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).