Piraí do Sul weather in September

In September, Piraí do Sul sees average daytime highs of 23°C and overnight lows near 12°C, with 130 mm of rain across 10.3 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 23°C through the month. The sky is clear or mostly clear about 38% 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 Piraí do Sul's 4th-clearest and 2nd-windiest month. For the whole year in context, see Piraí do Sul's year-round climate.

Daytime high
23°
8th warmest
Overnight low
12°
5th coldest
Rainfall
130 mm
10.3 wet days
Daylight
11 h 54 min
7:18 AM – 7:10 PM
Cloud cover
56%
4th clearest
Wind
11 km/h
2nd windiest
Solar energy
4.78 kWh/m²
Travel score
6.7
out of 10

Piraí do Sul 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 23°C through the month.

A typical September day in Piraí do Sul reaches about 23°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 17°C and 28°C. Set against its neighbours, September runs about 1°C warmer than August and about 1°C cooler than October.

10°15°20°25°30°151015202530
Avg high (°C)Avg low (°C)
12212
22312
32312
42312
52312
62312
72312
82312
92312
102312
112312
122312
132312
142312
152313
162313
172213
182213
192213
202213
212213
222213
232213
242213
252213
262213
272213
282213
292313
302313

Piraí do Sul 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
Jan26° / 17°24224.113.34.5
Feb26° / 17°18020.812.94.6
Mar25° / 17°13518.212.25.5
Apr24° / 15°719.611.46.9
May20° / 12°949.210.86.6
Jun19° / 11°96810.56.6
Jul20° / 10°796.810.66.9
Aug21° / 11°717.111.17.3
Sep23° / 12°13010.311.86.7
Oct24° / 14°14515.512.65.9
Nov25° / 15°13916.313.25.8
Dec26° / 17°18019.913.55.1

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 38% 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 50%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
16436
26238
36139
46040
55941
65842
75743
85644
95545
105446
115347
125248
135248
145149
155149
164951
174951
184852
194753
204654
214654
224555
234456
244357
254258
264159
273961
283862
293862
303862

Chance of precipitation in September

Any precipitation

Piraí do Sul gets around 130 mm of rain over 10.3 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 34% and peaks near 44% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%40%50%151015202530
Rain chance (%)
125
226
326
427
528
628
729
829
930
1031
1131
1232
1333
1433
1534
1634
1735
1836
1936
2037
2138
2239
2339
2440
2541
2642
2742
2843
2944
3044

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 53% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
1692740
2682840
3662950
4653050
5643150
6623260
7613360
8603460
9593560
10573670
11563770
12563770
13543880
14543880
15533890
16523990
175139100
185139100
195138110
205138110
214938120
224838130
234837140
244737160
254637170
264536190
274336200
284235220
294135231
304035241

Wind in September

Winds average 11 km/h in September.

Across September, daily wind ranges from about 10 km/h on the calmest days to 11 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
110calm
211calm
311calm
411calm
511calm
611calm
711calm
811calm
911calm
1011calm
1111calm
1211calm
1311calm
1411calm
1511calm
1611calm
1711calm
1811calm
1911calm
2011calm
2111calm
2211calm
2311calm
2411calm
2511calm
2611calm
2711calm
2811calm
2911calm
3011calm

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 7:35 AM to 7:03 AM, and sunset from 7:04 PM to 7:15 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
111.57:357:04
211.57:347:05
311.57:327:05
411.67:317:06
511.67:307:06
611.67:297:06
711.67:287:07
811.77:277:07
911.77:267:07
1011.77:257:08
1111.77:247:08
1211.87:237:08
1311.87:227:09
1411.87:217:09
1511.87:197:10
1611.97:187:10
1711.97:177:10
1811.97:167:11
1911.97:157:11
2012.07:147:11
2112.07:137:12
2212.07:127:12
2312.07:117:12
2412.17:107:13
2512.17:087:13
2612.17:077:14
2712.17:067:14
2812.27:057:14
2912.27:047:15
3012.27:037:15

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.78 kWh/m².

For context, solar energy here swings from a low near 3.13 kWh/m² to a high of 5.88 kWh/m² in December across the year — September's 4.78 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
14.8Bright
24.8Bright
34.8Bright
44.8Bright
54.8Bright
64.8Bright
74.8Bright
84.8Bright
94.8Bright
104.8Bright
114.8Bright
124.8Bright
134.8Bright
144.8Bright
154.8Bright
164.8Bright
174.8Bright
184.8Bright
194.8Bright
204.8Bright
214.8Bright
224.8Bright
234.8Bright
244.8Bright
254.8Bright
264.8Bright
274.8Bright
284.8Bright
294.8Bright
304.9Bright
Planning a trip in September

Is September a good time to visit Piraí do Sul?

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

6.7
Sightseeing
4th-best month of the year
4.9
Beach & pool
4th-best month of the year

September is a reasonable time to visit Piraí do Sul for sightseeing.

What to pack for Piraí do Sul in September

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

In September, Piraí do Sul sees daytime highs around 23°C and nights near 12°C. Worth packing: light clothes, rain gear and sun protection. About 10 days see rain.

light clothesrain gearsun protection

UV index in Piraí do Sul in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 5 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Piraí do Sul peaks around January 19 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 13 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 13UV 5
UV index (midday)Level
Jan15Extreme
Feb15Extreme
Mar13Extreme
Apr9Very high
May7High
Jun6High
Jul5High
Aug7Very high
Sep5High
Oct12Extreme
Nov14Extreme
Dec14Extreme

Air quality in Piraí do Sul 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 Piraí do Sul is worst in September — around 17 µg/m³ PM2.5 (moderate), about 2.6× the cleanest month (March, 6 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodSep 1316 µg/m³Mar 136 µg/m³
PM2.5 (µg/m³)Level
Jan7Good
Feb7Good
Mar6Good
Apr7Good
May8Good
Jun8Good
Jul10Good
Aug14Moderate
Sep17Moderate
Oct10Good
Nov7Good
Dec7Good
Location & terrain

Where is Piraí do Sul?

Piraí do Sul sits at 24.5°S, 49.9°W, 1,000 m above sea level, in Brazil. The nearest listed city is Castro, 30 km away.

Topography around Piraí do Sul

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

Within 3 km, the terrain around Piraí do Sul has only modest variations in elevation — a maximum elevation change of 207 m around an average of 1,038 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 414 m; within 80 km, large variations in elevation — a maximum elevation change of 1,159 m.

The land around Piraí do Sul is covered by trees (47%) and grassland (24%) within 3 km, trees (49%), cropland (29%) and grassland (22%) within 16 km, and trees (59%) and cropland (26%) within 80 km.

3 km
207 m
16 km
414 m
80 km
1,159 m
treesgrasslandcroplandartificial surfaces
September weather nearby: Castro 30 km · Jaguariaíva 40 km · Arapoti 43 km · Tibagi 47 km · Ponta Grossa 67 km · Sengés 67 km · Telêmaco Borba 71 km · Wenceslau Braz 74 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 Piraí do Sul (-24.5261°, -49.9486°, elevation 1,000 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).