Piracaia weather in September

In September, Piracaia sees average daytime highs of 24°C and overnight lows near 14°C, with 98 mm of rain across 10.3 wet days and about 11.9 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 40% 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 Piracaia's 5th-clearest and 1st-windiest month. For the whole year in context, see Piracaia's year-round climate.

Daytime high: 24°; 8th warmest
Overnight low: 14°; 5th coldest
Rainfall: 98 mm; 10.3 wet days
Daylight: 11 h 54 min; 7:04 AM – 6:56 PM
Cloud cover: 55%; 5th clearest
Wind: 9 km/h; 1st windiest
Solar energy: 5.03 kWh/m²
Travel score: 7.0; out of 10

Piracaia is human settlement in Brazil.

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

← August Piracaia year-round climate October →Best places to visit in September

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

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 Piracaia reaches about 24°C in the afternoon and slips back to 14°C overnight — a 10°C spread between the day's warmth and the night's chill. On most days the high lands between 19°C and 30°C. Set against its neighbours, September runs about 1°C warmer than August and on par with October.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Avg high (°C)	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24
Avg low (°C)	13	13	13	13	13	13	13	13	14	14	14	14	14	14	14	14	14	14	14	14	14	14	14	14	14	14	14	14	15	15

	Avg high (°C)	Avg low (°C)
1	24	13
2	24	13
3	24	13
4	24	13
5	24	13
6	24	13
7	24	13
8	24	13
9	24	14
10	24	14
11	24	14
12	24	14
13	24	14
14	24	14
15	24	14
16	24	14
17	24	14
18	24	14
19	24	14
20	24	14
21	24	14
22	24	14
23	24	14
24	24	14
25	24	14
26	24	14
27	24	14
28	24	14
29	24	15
30	24	15

Piracaia 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.

Month	High / Low (°C)	Rainfall (mm)	Wet days	Daylight (hours)	Travel score
Jan	26° / 18°	317	24.8	13.3	4.3
Feb	27° / 18°	255	20.7	12.8	4.5
Mar	26° / 17°	211	20.8	12.2	5.0
Apr	25° / 16°	83	11.5	11.5	6.7
May	22° / 13°	67	8.1	10.9	7.1
Jun	22° / 12°	45	5.3	10.6	7.5
Jul	22° / 11°	49	4.7	10.7	7.7
Aug	23° / 12°	40	5.3	11.2	7.9
Sep	24° / 14°	98	10.3	11.9	7.0
Oct	25° / 16°	154	15.9	12.5	5.8
Nov	25° / 16°	199	18.3	13.1	5.3
Dec	26° / 18°	262	22.9	13.4	4.6

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 40% 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 47%. Skies tend to cloud over as the month goes on.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Clearer (%)	67	66	65	64	63	63	61	60	59	58	57	56	55	55	54	53	52	51	49	48	49	46	46	44	44	44	42	42	41	40
Cloudier (%)	33	34	35	36	37	37	39	40	41	42	43	44	45	45	46	47	48	49	51	52	51	54	54	56	56	56	58	58	59	60

	Clearer (%)	Cloudier (%)
1	67	33
2	66	34
3	65	35
4	64	36
5	63	37
6	63	37
7	61	39
8	60	40
9	59	41
10	58	42
11	57	43
12	56	44
13	55	45
14	55	45
15	54	46
16	53	47
17	52	48
18	51	49
19	49	51
20	48	52
21	49	51
22	46	54
23	46	54
24	44	56
25	44	56
26	44	56
27	42	58
28	42	58
29	41	59
30	40	60

Chance of precipitation in September

Any precipitation

Piracaia gets around 98 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 47% on the wettest days. The odds climb toward the end of the month.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Rain chance (%)	24	24	25	25	25	26	26	27	27	28	28	29	29	30	31	32	33	35	36	37	39	40	41	43	44	45	46	46	47	47

	Rain chance (%)
1	24
2	24
3	25
4	25
5	25
6	26
7	26
8	27
9	27
10	28
11	28
12	29
13	29
14	30
15	31
16	32
17	33
18	35
19	36
20	37
21	39
22	40
23	41
24	43
25	44
26	45
27	46
28	46
29	47
30	47

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 44% of days. It rarely turns muggy — the humid and sticky bands barely register.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Dry (%)	65	64	63	61	59	57	56	54	53	51	49	47	46	44	43	41	40	39	38	37	36	35	34	33	32	31	30	29	28	27
Comfortable (%)	31	32	33	34	36	37	38	39	40	41	42	43	44	45	46	46	46	47	47	46	46	46	45	45	44	44	44	43	43	42
Humid (%)	4	4	4	5	5	6	6	7	7	8	9	9	10	11	12	13	13	14	16	17	18	19	21	22	24	25	27	28	29	31

	Dry (%)	Comfortable (%)	Humid (%)
1	65	31	4
2	64	32	4
3	63	33	4
4	61	34	5
5	59	36	5
6	57	37	6
7	56	38	6
8	54	39	7
9	53	40	7
10	51	41	8
11	49	42	9
12	47	43	9
13	46	44	10
14	44	45	11
15	43	46	12
16	41	46	13
17	40	46	13
18	39	47	14
19	38	47	16
20	37	46	17
21	36	46	18
22	35	46	19
23	34	45	21
24	33	45	22
25	32	44	24
26	31	44	25
27	30	44	27
28	29	43	28
29	28	43	29
30	27	42	31

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.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Wind speed (km/h)	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9
Feels	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm

	Wind speed (km/h)	Feels
1	9	calm
2	9	calm
3	9	calm
4	9	calm
5	9	calm
6	9	calm
7	9	calm
8	9	calm
9	9	calm
10	9	calm
11	9	calm
12	9	calm
13	9	calm
14	9	calm
15	9	calm
16	9	calm
17	9	calm
18	9	calm
19	9	calm
20	9	calm
21	9	calm
22	9	calm
23	9	calm
24	9	calm
25	9	calm
26	9	calm
27	9	calm
28	9	calm
29	9	calm
30	9	calm

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 7:19 AM to 6:49 AM, and sunset from 6:51 PM to 7:00 PM.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Daylight (h)	11.5	11.6	11.6	11.6	11.6	11.6	11.7	11.7	11.7	11.7	11.8	11.8	11.8	11.8	11.8	11.9	11.9	11.9	11.9	12.0	12.0	12.0	12.0	12.1	12.1	12.1	12.1	12.1	12.2	12.2
Sunrise (AM)	7:19	7:18	7:17	7:16	7:15	7:14	7:13	7:12	7:11	7:10	7:09	7:08	7:07	7:06	7:05	7:04	7:03	7:02	7:01	6:59	6:58	6:57	6:56	6:55	6:54	6:53	6:52	6:51	6:50	6:49
Sunset (PM)	6:51	6:51	6:52	6:52	6:52	6:53	6:53	6:53	6:54	6:54	6:54	6:55	6:55	6:55	6:55	6:56	6:56	6:56	6:57	6:57	6:57	6:58	6:58	6:58	6:59	6:59	6:59	7:00	7:00	7:00

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	11.5	7:19	6:51
2	11.6	7:18	6:51
3	11.6	7:17	6:52
4	11.6	7:16	6:52
5	11.6	7:15	6:52
6	11.6	7:14	6:53
7	11.7	7:13	6:53
8	11.7	7:12	6:53
9	11.7	7:11	6:54
10	11.7	7:10	6:54
11	11.8	7:09	6:54
12	11.8	7:08	6:55
13	11.8	7:07	6:55
14	11.8	7:06	6:55
15	11.8	7:05	6:55
16	11.9	7:04	6:56
17	11.9	7:03	6:56
18	11.9	7:02	6:56
19	11.9	7:01	6:57
20	12.0	6:59	6:57
21	12.0	6:58	6:57
22	12.0	6:57	6:58
23	12.0	6:56	6:58
24	12.1	6:55	6:58
25	12.1	6:54	6:59
26	12.1	6:53	6:59
27	12.1	6:52	6:59
28	12.1	6:51	7:00
29	12.2	6:50	7:00
30	12.2	6:49	7:00

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.03 kWh/m².

For context, solar energy here swings from a low near 3.56 kWh/m² to a high of 5.54 kWh/m² in November across the year — September's 5.03 kWh/m² falls in the middle.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Solar energy (kWh/m²)	5.0	5.0	5.0	5.0	5.0	5.0	5.0	5.0	5.0	5.0	5.0	5.0	5.0	5.0	5.0	5.0	5.0	5.0	5.0	5.0	5.0	5.0	5.0	5.0	5.0	5.0	5.0	5.1	5.1	5.1
Level	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright

	Solar energy (kWh/m²)	Level
1	5.0	Bright
2	5.0	Bright
3	5.0	Bright
4	5.0	Bright
5	5.0	Bright
6	5.0	Bright
7	5.0	Bright
8	5.0	Bright
9	5.0	Bright
10	5.0	Bright
11	5.0	Bright
12	5.0	Bright
13	5.0	Bright
14	5.0	Bright
15	5.0	Bright
16	5.0	Bright
17	5.0	Bright
18	5.0	Bright
19	5.0	Bright
20	5.0	Bright
21	5.0	Bright
22	5.0	Bright
23	5.0	Bright
24	5.0	Bright
25	5.0	Bright
26	5.0	Bright
27	5.0	Bright
28	5.1	Bright
29	5.1	Bright
30	5.1	Bright

Planning a trip in September

Hazard calendar for Piracaia

In seasonPeak

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

Piracaia's rainy season runs October–March, when most of the year's rain falls.

Rainy season

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Is September a good time to visit Piracaia?

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

7.0

Sightseeing

5th-best month of the year

6.0

Beach & pool

2nd-best month of the year

September is one of the better times to visit Piracaia for general sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Piracaia in September

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

In September, Piracaia sees daytime highs around 24°C and nights near 14°C. Worth packing: light clothes, rain gear and sun protection. About 10 days see rain.

light clothesrain gearsun protection

UV index in Piracaia in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 8 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Piracaia peaks around January 20 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 12 at about 6 (high).

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

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
UV index (midday)	15	15	12	9	7	6	5	8	8	11	13	14
Level	Extreme	Extreme	Extreme	Very high	High	High	High	Very high	Very high	Extreme	Extreme	Extreme

	UV index (midday)	Level
Jan	15	Extreme
Feb	15	Extreme
Mar	12	Extreme
Apr	9	Very high
May	7	High
Jun	6	High
Jul	5	High
Aug	8	Very high
Sep	8	Very high
Oct	11	Extreme
Nov	13	Extreme
Dec	14	Extreme

Air quality in Piracaia 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 Piracaia is worst in June — around 71 µg/m³ PM2.5 (unhealthy), about 2.3× the cleanest month (December, 31 µg/m³).

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

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
PM2.5 (µg/m³)	32	34	41	48	62	71	70	60	53	39	32	31
Level	Moderate	Moderate	Poor	Poor	Unhealthy	Unhealthy	Unhealthy	Unhealthy	Poor	Poor	Moderate	Moderate

	PM2.5 (µg/m³)	Level
Jan	32	Moderate
Feb	34	Moderate
Mar	41	Poor
Apr	48	Poor
May	62	Unhealthy
Jun	71	Unhealthy
Jul	70	Unhealthy
Aug	60	Unhealthy
Sep	53	Poor
Oct	39	Poor
Nov	32	Moderate
Dec	31	Moderate

Location & terrain

Where is Piracaia?

Piracaia sits at 23.1°S, 46.4°W, 822 m above sea level, in Brazil. The nearest listed city is Bom Jesus dos Perdões, 14 km away.

Topography around Piracaia

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

Within 3 km, the terrain around Piracaia has significant variations in elevation — a maximum elevation change of 309 m around an average of 859 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 889 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,859 m.

The land around Piracaia is covered by grassland (59%) and trees (28%) within 3 km, trees (51%) and grassland (37%) within 16 km, and trees (48%) and grassland (35%) within 80 km.

3 km

309 m

grassland 59%

16 km

889 m

trees 51%

80 km

1,859 m

trees 48%

treesgrasslandcroplandartificial surfaceswater

← August Piracaia year-round climate October →Best places to visit in September

September weather nearby: Bom Jesus dos Perdões 14 km · Nazaré Paulista 15 km · Atibaia 21 km · Bragança Paulista 22 km · Extrema 23 km · Santa Isabel 32 km · Bairro da Penha 35 km · Mairiporã 38 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

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 Piracaia (-23.0539°, -46.3581°, elevation 822 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).

	Avg high (°C)	Avg low (°C)
1	24	13
2	24	13
3	24	13
4	24	13
5	24	13
6	24	13
7	24	13
8	24	13
9	24	14
10	24	14
11	24	14
12	24	14
13	24	14
14	24	14
15	24	14
16	24	14
17	24	14
18	24	14
19	24	14
20	24	14
21	24	14
22	24	14
23	24	14
24	24	14
25	24	14
26	24	14
27	24	14
28	24	14
29	24	15
30	24	15

	Clearer (%)	Cloudier (%)
1	67	33
2	66	34
3	65	35
4	64	36
5	63	37
6	63	37
7	61	39
8	60	40
9	59	41
10	58	42
11	57	43
12	56	44
13	55	45
14	55	45
15	54	46
16	53	47
17	52	48
18	51	49
19	49	51
20	48	52
21	49	51
22	46	54
23	46	54
24	44	56
25	44	56
26	44	56
27	42	58
28	42	58
29	41	59
30	40	60

	Rain chance (%)
1	24
2	24
3	25
4	25
5	25
6	26
7	26
8	27
9	27
10	28
11	28
12	29
13	29
14	30
15	31
16	32
17	33
18	35
19	36
20	37
21	39
22	40
23	41
24	43
25	44
26	45
27	46
28	46
29	47
30	47

	Dry (%)	Comfortable (%)	Humid (%)
1	65	31	4
2	64	32	4
3	63	33	4
4	61	34	5
5	59	36	5
6	57	37	6
7	56	38	6
8	54	39	7
9	53	40	7
10	51	41	8
11	49	42	9
12	47	43	9
13	46	44	10
14	44	45	11
15	43	46	12
16	41	46	13
17	40	46	13
18	39	47	14
19	38	47	16
20	37	46	17
21	36	46	18
22	35	46	19
23	34	45	21
24	33	45	22
25	32	44	24
26	31	44	25
27	30	44	27
28	29	43	28
29	28	43	29
30	27	42	31

	Avg high (°C)	Avg low (°C)
1	24	13
2	24	13
3	24	13
4	24	13
5	24	13
6	24	13
7	24	13
8	24	13
9	24	14
10	24	14
11	24	14
12	24	14
13	24	14
14	24	14
15	24	14
16	24	14
17	24	14
18	24	14
19	24	14
20	24	14
21	24	14
22	24	14
23	24	14
24	24	14
25	24	14
26	24	14
27	24	14
28	24	14
29	24	15
30	24	15

	Clearer (%)	Cloudier (%)
1	67	33
2	66	34
3	65	35
4	64	36
5	63	37
6	63	37
7	61	39
8	60	40
9	59	41
10	58	42
11	57	43
12	56	44
13	55	45
14	55	45
15	54	46
16	53	47
17	52	48
18	51	49
19	49	51
20	48	52
21	49	51
22	46	54
23	46	54
24	44	56
25	44	56
26	44	56
27	42	58
28	42	58
29	41	59
30	40	60

	Rain chance (%)
1	24
2	24
3	25
4	25
5	25
6	26
7	26
8	27
9	27
10	28
11	28
12	29
13	29
14	30
15	31
16	32
17	33
18	35
19	36
20	37
21	39
22	40
23	41
24	43
25	44
26	45
27	46
28	46
29	47
30	47

	Dry (%)	Comfortable (%)	Humid (%)
1	65	31	4
2	64	32	4
3	63	33	4
4	61	34	5
5	59	36	5
6	57	37	6
7	56	38	6
8	54	39	7
9	53	40	7
10	51	41	8
11	49	42	9
12	47	43	9
13	46	44	10
14	44	45	11
15	43	46	12
16	41	46	13
17	40	46	13
18	39	47	14
19	38	47	16
20	37	46	17
21	36	46	18
22	35	46	19
23	34	45	21
24	33	45	22
25	32	44	24
26	31	44	25
27	30	44	27
28	29	43	28
29	28	43	29
30	27	42	31

	Avg high (°C)	Avg low (°C)
1	24	13
2	24	13
3	24	13
4	24	13
5	24	13
6	24	13
7	24	13
8	24	13
9	24	14
10	24	14
11	24	14
12	24	14
13	24	14
14	24	14
15	24	14
16	24	14
17	24	14
18	24	14
19	24	14
20	24	14
21	24	14
22	24	14
23	24	14
24	24	14
25	24	14
26	24	14
27	24	14
28	24	14
29	24	15
30	24	15

	Clearer (%)	Cloudier (%)
1	67	33
2	66	34
3	65	35
4	64	36
5	63	37
6	63	37
7	61	39
8	60	40
9	59	41
10	58	42
11	57	43
12	56	44
13	55	45
14	55	45
15	54	46
16	53	47
17	52	48
18	51	49
19	49	51
20	48	52
21	49	51
22	46	54
23	46	54
24	44	56
25	44	56
26	44	56
27	42	58
28	42	58
29	41	59
30	40	60

	Rain chance (%)
1	24
2	24
3	25
4	25
5	25
6	26
7	26
8	27
9	27
10	28
11	28
12	29
13	29
14	30
15	31
16	32
17	33
18	35
19	36
20	37
21	39
22	40
23	41
24	43
25	44
26	45
27	46
28	46
29	47
30	47

	Dry (%)	Comfortable (%)	Humid (%)
1	65	31	4
2	64	32	4
3	63	33	4
4	61	34	5
5	59	36	5
6	57	37	6
7	56	38	6
8	54	39	7
9	53	40	7
10	51	41	8
11	49	42	9
12	47	43	9
13	46	44	10
14	44	45	11
15	43	46	12
16	41	46	13
17	40	46	13
18	39	47	14
19	38	47	16
20	37	46	17
21	36	46	18
22	35	46	19
23	34	45	21
24	33	45	22
25	32	44	24
26	31	44	25
27	30	44	27
28	29	43	28
29	28	43	29
30	27	42	31