Cachoeira do Piriá weather in September

In September, Cachoeira do Piriá sees average daytime highs of 32°C and overnight lows near 23°C, with 27 mm of rain across 7.7 wet days and about 12 hours of daylight. It is the 4th-warmest and 11th-wettest month of the year here.

Day-to-day highs hold fairly steady near 32°C through the month. The sky is clear or mostly clear about 39% of the time in September, and the air most often feels oppressive.

Daylight stretches from about 12 hours at the start of September to 12 hours by month's end. Set against the rest of the year, September is Cachoeira do Piriá's 2nd-clearest and 3rd-windiest month. For the whole year in context, see Cachoeira do Piriá's year-round climate.

Daytime high: 32°; 4th warmest
Overnight low: 23°; 4th coldest
Rainfall: 27 mm; 7.7 wet days
Daylight: 12 hours; 6:01 AM – 6:00 PM
Cloud cover: 47%; 2nd clearest
Wind: 11 km/h; 3rd windiest
Solar energy: 5.85 kWh/m²
Travel score: 4.1; out of 10

← August Cachoeira do Piriá 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 32°C through the month.

A typical September day in Cachoeira do Piriá reaches about 32°C in the afternoon and slips back to 23°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 31°C and 33°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)	32	32	32	32	32	32	32	32	32	32	32	32	32	32	32	32	32	32	32	32	32	33	33	33	33	33	33	33	33	33
Avg low (°C)	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23

	Avg high (°C)	Avg low (°C)
1	32	23
2	32	23
3	32	23
4	32	23
5	32	23
6	32	23
7	32	23
8	32	23
9	32	23
10	32	23
11	32	23
12	32	23
13	32	23
14	32	23
15	32	23
16	32	23
17	32	23
18	32	23
19	32	23
20	32	23
21	32	23
22	33	23
23	33	23
24	33	23
25	33	23
26	33	23
27	33	23
28	33	23
29	33	23
30	33	23

How September really feels in Cachoeira do Piriá

Once humidity and wind are folded in, September averages 30 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

heat index over the day's high

Days feeling ≤ 0°C

wind chill below the day's low

The story in September is heat — humidity pushes the afternoon "feels like" well above the raw temperature.

Cachoeira do Piriá weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 11th-wettest month here — the current month is highlighted below.

Month	High / Low (°C)	Rainfall (mm)	Wet days	Daylight (hours)	Travel score
Jan	31° / 23°	220	25.5	12.1	2.8
Feb	30° / 23°	296	26.4	12.1	2.6
Mar	30° / 23°	385	30.1	12	2.6
Apr	30° / 23°	376	29.1	12	2.6
May	31° / 23°	227	27.5	11.9	2.8
Jun	31° / 23°	119	21.2	11.9	3.4
Jul	31° / 22°	88	18.2	11.9	4.0
Aug	31° / 22°	42	11.1	11.9	4.4
Sep	32° / 23°	27	7.7	12	4.1
Oct	33° / 23°	27	5.9	12	3.9
Nov	33° / 24°	36	7	12.1	3.7
Dec	33° / 24°	86	14.5	12.1	3.3

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 39% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 44% of September, with mostly cloudy or overcast conditions the remaining 17%.

	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 (%)	85	85	85	86	86	86	86	85	85	85	85	85	85	84	83	83	83	83	82	82	82	81	81	81	81	81	80	79	79	79
Cloudier (%)	15	15	15	14	14	14	14	15	15	15	15	15	15	16	17	17	17	17	18	18	18	19	19	19	19	19	20	21	21	21

	Clearer (%)	Cloudier (%)
1	85	15
2	85	15
3	85	15
4	86	14
5	86	14
6	86	14
7	86	14
8	85	15
9	85	15
10	85	15
11	85	15
12	85	15
13	85	15
14	84	16
15	83	17
16	83	17
17	83	17
18	83	17
19	82	18
20	82	18
21	82	18
22	81	19
23	81	19
24	81	19
25	81	19
26	81	19
27	80	20
28	79	21
29	79	21
30	79	21

Chance of precipitation in September

Any precipitation

Cachoeira do Piriá gets around 27 mm of rain over 7.7 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 26% and peaks near 30% on the wettest days. The odds ease 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 (%)	30	30	30	30	29	29	29	29	28	28	28	28	27	27	27	26	26	25	25	24	24	23	23	22	22	21	21	21	21	20

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

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the oppressive band about 98% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

	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
Muggy (%)	1	1	1	1	1	1	1	2	2	2	2	2	2	2	2	2	2	2	2	2	2	2	3	3	3	3	3	3	3	3
Oppressive (%)	99	99	99	99	99	99	99	98	98	98	98	98	98	98	98	98	98	98	98	98	98	98	97	97	97	97	97	97	97	97

	Muggy (%)	Oppressive (%)
1	1	99
2	1	99
3	1	99
4	1	99
5	1	99
6	1	99
7	1	99
8	2	98
9	2	98
10	2	98
11	2	98
12	2	98
13	2	98
14	2	98
15	2	98
16	2	98
17	2	98
18	2	98
19	2	98
20	2	98
21	2	98
22	2	98
23	3	97
24	3	97
25	3	97
26	3	97
27	3	97
28	3	97
29	3	97
30	3	97

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.

	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)	10	10	10	10	10	10	10	10	11	11	11	11	11	11	11	11	11	11	11	11	11	11	11	11	11	11	11	11	11	11
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	10	calm
2	10	calm
3	10	calm
4	10	calm
5	10	calm
6	10	calm
7	10	calm
8	10	calm
9	11	calm
10	11	calm
11	11	calm
12	11	calm
13	11	calm
14	11	calm
15	11	calm
16	11	calm
17	11	calm
18	11	calm
19	11	calm
20	11	calm
21	11	calm
22	11	calm
23	11	calm
24	11	calm
25	11	calm
26	11	calm
27	11	calm
28	11	calm
29	11	calm
30	11	calm

Sunrise & sunset in September

DaylightNight

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

Days grow by about 0 minutes over September. Sunrise moves from 6:07 AM to 5:55 AM, and sunset from 6:05 PM to 5:56 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)	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0
Sunrise (AM)	6:07	6:07	6:06	6:06	6:05	6:05	6:05	6:04	6:04	6:03	6:03	6:02	6:02	6:02	6:01	6:01	6:00	6:00	6:00	5:59	5:59	5:58	5:58	5:57	5:57	5:57	5:56	5:56	5:55	5:55
Sunset (PM)	6:05	6:05	6:04	6:04	6:04	6:03	6:03	6:03	6:02	6:02	6:02	6:02	6:01	6:01	6:01	6:00	6:00	6:00	5:59	5:59	5:59	5:58	5:58	5:58	5:57	5:57	5:57	5:56	5:56	5:56

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	12.0	6:07	6:05
2	12.0	6:07	6:05
3	12.0	6:06	6:04
4	12.0	6:06	6:04
5	12.0	6:05	6:04
6	12.0	6:05	6:03
7	12.0	6:05	6:03
8	12.0	6:04	6:03
9	12.0	6:04	6:02
10	12.0	6:03	6:02
11	12.0	6:03	6:02
12	12.0	6:02	6:02
13	12.0	6:02	6:01
14	12.0	6:02	6:01
15	12.0	6:01	6:01
16	12.0	6:01	6:00
17	12.0	6:00	6:00
18	12.0	6:00	6:00
19	12.0	6:00	5:59
20	12.0	5:59	5:59
21	12.0	5:59	5:59
22	12.0	5:58	5:58
23	12.0	5:58	5:58
24	12.0	5:57	5:58
25	12.0	5:57	5:57
26	12.0	5:57	5:57
27	12.0	5:56	5:57
28	12.0	5:56	5:56
29	12.0	5:55	5:56
30	12.0	5:55	5:56

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.85 kWh/m².

For context, solar energy here swings from a low near 4.03 kWh/m² to a high of 5.95 kWh/m² in October across the year — September's 5.85 kWh/m² sits near the top of that range.

	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)	5.7	5.7	5.7	5.8	5.8	5.8	5.8	5.8	5.8	5.8	5.8	5.8	5.8	5.8	5.8	5.8	5.8	5.9	5.9	5.9	5.9	5.9	5.9	5.9	5.9	5.9	6.0	6.0	6.0	6.0
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	5.7	Bright
2	5.7	Bright
3	5.7	Bright
4	5.8	Bright
5	5.8	Bright
6	5.8	Bright
7	5.8	Bright
8	5.8	Bright
9	5.8	Bright
10	5.8	Bright
11	5.8	Bright
12	5.8	Bright
13	5.8	Bright
14	5.8	Bright
15	5.8	Bright
16	5.8	Bright
17	5.8	Bright
18	5.9	Bright
19	5.9	Bright
20	5.9	Bright
21	5.9	Bright
22	5.9	Bright
23	5.9	Bright
24	5.9	Bright
25	5.9	Bright
26	5.9	Bright
27	6.0	Bright
28	6.0	Bright
29	6.0	Bright
30	6.0	Bright

Planning a trip in September

Hazard calendar for Cachoeira do Piriá

In seasonPeak

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

Cachoeira do Piriá's monsoon runs January–May, 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 Cachoeira do Piriá?

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

4.1

Sightseeing

2nd-best month of the year

6.8

Beach & pool

2nd-best month of the year

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

What to pack for Cachoeira do Piriá in September

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

In September, Cachoeira do Piriá sees daytime highs around 32°C and nights near 23°C. Pack light clothes. Worth having: sun protection. About 8 days see rain.

light clothessun protection

UV index in Cachoeira do Piriá 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 Cachoeira do Piriá peaks around March 17 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 17 at about 10 (extreme).

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)	13	14	15	14	12	11	10	11	12	12	11	11
Level	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme

	UV index (midday)	Level
Jan	13	Extreme
Feb	14	Extreme
Mar	15	Extreme
Apr	14	Extreme
May	12	Extreme
Jun	11	Extreme
Jul	10	Extreme
Aug	11	Extreme
Sep	12	Extreme
Oct	12	Extreme
Nov	11	Extreme
Dec	11	Extreme

Air quality in Cachoeira do Piriá 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 Cachoeira do Piriá is worst in February — around 19 µg/m³ PM2.5 (moderate), about 2.9× the cleanest month (July, 7 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)	16	19	19	14	8	7	7	8	10	12	18	18
Level	Moderate	Moderate	Moderate	Moderate	Good	Good	Good	Good	Good	Good	Moderate	Moderate

	PM2.5 (µg/m³)	Level
Jan	16	Moderate
Feb	19	Moderate
Mar	19	Moderate
Apr	14	Moderate
May	8	Good
Jun	7	Good
Jul	7	Good
Aug	8	Good
Sep	10	Good
Oct	12	Good
Nov	18	Moderate
Dec	18	Moderate

Location & terrain

Where is Cachoeira do Piriá?

Cachoeira do Piriá sits at 1.8°S, 46.5°W, 77 m above sea level, in Brazil. The nearest listed city is Santa Luzia do Pará, 47 km away.

Topography around Cachoeira do Piriá

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

Within 3 km, the terrain around Cachoeira do Piriá has only modest variations in elevation — a maximum elevation change of 117 m around an average of 35 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 128 m; within 80 km, only modest variations in elevation — a maximum elevation change of 206 m.

The land around Cachoeira do Piriá is covered by grassland (52%) and trees (46%) within 3 km, trees (57%) and grassland (43%) within 16 km, and trees (56%) and grassland (42%) within 80 km.

3 km

117 m

grassland 52%

16 km

128 m

trees 57%

80 km

206 m

trees 56%

treesgrasslandartificial surfacesbare terrainmangroves

← August Cachoeira do Piriá year-round climate October →Best places to visit in September

September weather nearby: Santa Luzia do Pará 47 km · Capitão Poço 57 km · Garrafão do Norte 60 km · Centro Novo do Maranhão 63 km · Ourém 67 km · Maracaçumé 72 km · Nova Esperança do Piriá 73 km · Viseu 77 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 Cachoeira do Piriá (-1.7597°, -46.545°, elevation 77 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	32	23
2	32	23
3	32	23
4	32	23
5	32	23
6	32	23
7	32	23
8	32	23
9	32	23
10	32	23
11	32	23
12	32	23
13	32	23
14	32	23
15	32	23
16	32	23
17	32	23
18	32	23
19	32	23
20	32	23
21	32	23
22	33	23
23	33	23
24	33	23
25	33	23
26	33	23
27	33	23
28	33	23
29	33	23
30	33	23

	Clearer (%)	Cloudier (%)
1	85	15
2	85	15
3	85	15
4	86	14
5	86	14
6	86	14
7	86	14
8	85	15
9	85	15
10	85	15
11	85	15
12	85	15
13	85	15
14	84	16
15	83	17
16	83	17
17	83	17
18	83	17
19	82	18
20	82	18
21	82	18
22	81	19
23	81	19
24	81	19
25	81	19
26	81	19
27	80	20
28	79	21
29	79	21
30	79	21

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

	Muggy (%)	Oppressive (%)
1	1	99
2	1	99
3	1	99
4	1	99
5	1	99
6	1	99
7	1	99
8	2	98
9	2	98
10	2	98
11	2	98
12	2	98
13	2	98
14	2	98
15	2	98
16	2	98
17	2	98
18	2	98
19	2	98
20	2	98
21	2	98
22	2	98
23	3	97
24	3	97
25	3	97
26	3	97
27	3	97
28	3	97
29	3	97
30	3	97

	Avg high (°C)	Avg low (°C)
1	32	23
2	32	23
3	32	23
4	32	23
5	32	23
6	32	23
7	32	23
8	32	23
9	32	23
10	32	23
11	32	23
12	32	23
13	32	23
14	32	23
15	32	23
16	32	23
17	32	23
18	32	23
19	32	23
20	32	23
21	32	23
22	33	23
23	33	23
24	33	23
25	33	23
26	33	23
27	33	23
28	33	23
29	33	23
30	33	23

	Clearer (%)	Cloudier (%)
1	85	15
2	85	15
3	85	15
4	86	14
5	86	14
6	86	14
7	86	14
8	85	15
9	85	15
10	85	15
11	85	15
12	85	15
13	85	15
14	84	16
15	83	17
16	83	17
17	83	17
18	83	17
19	82	18
20	82	18
21	82	18
22	81	19
23	81	19
24	81	19
25	81	19
26	81	19
27	80	20
28	79	21
29	79	21
30	79	21

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

	Muggy (%)	Oppressive (%)
1	1	99
2	1	99
3	1	99
4	1	99
5	1	99
6	1	99
7	1	99
8	2	98
9	2	98
10	2	98
11	2	98
12	2	98
13	2	98
14	2	98
15	2	98
16	2	98
17	2	98
18	2	98
19	2	98
20	2	98
21	2	98
22	2	98
23	3	97
24	3	97
25	3	97
26	3	97
27	3	97
28	3	97
29	3	97
30	3	97

	Avg high (°C)	Avg low (°C)
1	32	23
2	32	23
3	32	23
4	32	23
5	32	23
6	32	23
7	32	23
8	32	23
9	32	23
10	32	23
11	32	23
12	32	23
13	32	23
14	32	23
15	32	23
16	32	23
17	32	23
18	32	23
19	32	23
20	32	23
21	32	23
22	33	23
23	33	23
24	33	23
25	33	23
26	33	23
27	33	23
28	33	23
29	33	23
30	33	23

	Clearer (%)	Cloudier (%)
1	85	15
2	85	15
3	85	15
4	86	14
5	86	14
6	86	14
7	86	14
8	85	15
9	85	15
10	85	15
11	85	15
12	85	15
13	85	15
14	84	16
15	83	17
16	83	17
17	83	17
18	83	17
19	82	18
20	82	18
21	82	18
22	81	19
23	81	19
24	81	19
25	81	19
26	81	19
27	80	20
28	79	21
29	79	21
30	79	21

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

	Muggy (%)	Oppressive (%)
1	1	99
2	1	99
3	1	99
4	1	99
5	1	99
6	1	99
7	1	99
8	2	98
9	2	98
10	2	98
11	2	98
12	2	98
13	2	98
14	2	98
15	2	98
16	2	98
17	2	98
18	2	98
19	2	98
20	2	98
21	2	98
22	2	98
23	3	97
24	3	97
25	3	97
26	3	97
27	3	97
28	3	97
29	3	97
30	3	97