Careiro weather in September

In September, Careiro sees average daytime highs of 33°C and overnight lows near 24°C, with 175 mm of rain across 21.1 wet days and about 12 hours of daylight. It is the 1st-warmest and 10th-wettest month of the year here.

Day-to-day highs hold fairly steady near 33°C through the month. The sky is clear or mostly clear about 18% of the time in September, and the air most often feels miserable.

Daylight stretches from about 11 h 54 min at the start of September to 12 hours by month's end. Set against the rest of the year, September is Careiro's 3rd-clearest and 6th-windiest month. For the whole year in context, see Careiro's year-round climate.

Daytime high: 33°; 1st warmest
Overnight low: 24°; 10th coldest
Rainfall: 175 mm; 21.1 wet days
Daylight: 12 hours; 5:56 AM – 5:55 PM
Cloud cover: 68%; 3rd clearest
Wind: 5 km/h; 6th windiest
Solar energy: 5.29 kWh/m²
Travel score: 2.7; out of 10

← August Careiro 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 33°C through the month.

A typical September day in Careiro reaches about 33°C in the afternoon and slips back to 24°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 30°C and 35°C. Set against its neighbours, September runs on par with 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	33	33	33	33	33	33	33	33	33	33	33	33	33	33	33	33	33
Avg low (°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 high (°C)	Avg low (°C)
1	32	24
2	32	24
3	32	24
4	32	24
5	32	24
6	32	24
7	32	24
8	32	24
9	32	24
10	32	24
11	32	24
12	32	24
13	32	24
14	33	24
15	33	24
16	33	24
17	33	24
18	33	24
19	33	24
20	33	24
21	33	24
22	33	24
23	33	24
24	33	24
25	33	24
26	33	24
27	33	24
28	33	24
29	33	24
30	33	24

How September really feels in Careiro

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

30 feel dangerously hot (≥ 39°C)

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.

Careiro weather by month

How September compares with the rest of the year at a glance. September is the 1st-warmest and 10th-wettest month here — the current month is highlighted below.

Month	High / Low (°C)	Rainfall (mm)	Wet days	Daylight (hours)	Travel score
Jan	30° / 23°	355	28.7	12.2	2.6
Feb	30° / 23°	351	26.1	12.1	2.7
Mar	30° / 24°	432	29.4	12	2.6
Apr	30° / 23°	437	28.8	11.9	2.6
May	30° / 23°	363	29.3	11.8	2.6
Jun	31° / 23°	213	23.6	11.8	3.1
Jul	31° / 23°	152	21.5	11.8	3.4
Aug	32° / 23°	145	19.2	11.9	3.1
Sep	33° / 24°	175	21.1	12	2.7
Oct	32° / 24°	189	22.4	12.1	2.6
Nov	32° / 24°	224	24.8	12.2	2.5
Dec	31° / 24°	326	28.3	12.2	2.6

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 18% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 20% of September, with mostly cloudy or overcast conditions the remaining 62%. 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 (%)	46	45	44	44	43	42	41	41	40	40	39	39	39	38	38	37	35	35	34	34	33	34	34	33	34	33	33	34	34	35
Cloudier (%)	54	55	56	56	57	58	59	59	60	60	61	61	61	62	62	63	65	65	66	66	67	66	66	67	66	67	67	66	66	65

	Clearer (%)	Cloudier (%)
1	46	54
2	45	55
3	44	56
4	44	56
5	43	57
6	42	58
7	41	59
8	41	59
9	40	60
10	40	60
11	39	61
12	39	61
13	39	61
14	38	62
15	38	62
16	37	63
17	35	65
18	35	65
19	34	66
20	34	66
21	33	67
22	34	66
23	34	66
24	33	67
25	34	66
26	33	67
27	33	67
28	34	66
29	34	66
30	35	65

Chance of precipitation in September

Any precipitation

Careiro gets around 175 mm of rain over 21.1 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 70% and peaks near 71% on the wettest days.

	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 (%)	70	70	70	70	70	70	70	70	70	70	70	70	70	70	70	70	70	70	71	71	71	71	70	70	70	69	69	69	69	68

	Rain chance (%)
1	70
2	70
3	70
4	70
5	70
6	70
7	70
8	70
9	70
10	70
11	70
12	70
13	70
14	70
15	70
16	70
17	70
18	70
19	71
20	71
21	71
22	71
23	70
24	70
25	70
26	69
27	69
28	69
29	69
30	68

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the miserable band about 70% 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	2	2	2	2	2	2	2	2
Oppressive (%)	31	31	31	31	31	31	31	30	30	30	29	29	28	28	28	28	27	27	27	27	27	27	27	27	27	28	28	29	29	30
Miserable (%)	68	68	68	68	68	68	68	68	68	68	69	69	70	70	70	70	71	71	71	71	71	71	71	71	71	70	70	69	69	68

	Muggy (%)	Oppressive (%)	Miserable (%)
1	1	31	68
2	1	31	68
3	1	31	68
4	1	31	68
5	1	31	68
6	1	31	68
7	1	31	68
8	2	30	68
9	2	30	68
10	2	30	68
11	2	29	69
12	2	29	69
13	2	28	70
14	2	28	70
15	2	28	70
16	2	28	70
17	2	27	71
18	2	27	71
19	2	27	71
20	2	27	71
21	2	27	71
22	2	27	71
23	2	27	71
24	2	27	71
25	2	27	71
26	2	28	70
27	2	28	70
28	2	29	69
29	2	29	69
30	2	30	68

Wind in September

Winds average 5 km/h in September.

Across September, daily wind ranges from about 5 km/h on the calmest days to 5 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)	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5
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	5	calm
2	5	calm
3	5	calm
4	5	calm
5	5	calm
6	5	calm
7	5	calm
8	5	calm
9	5	calm
10	5	calm
11	5	calm
12	5	calm
13	5	calm
14	5	calm
15	5	calm
16	5	calm
17	5	calm
18	5	calm
19	5	calm
20	5	calm
21	5	calm
22	5	calm
23	5	calm
24	5	calm
25	5	calm
26	5	calm
27	5	calm
28	5	calm
29	5	calm
30	5	calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 11 h 54 min 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 6 minutes over September. Sunrise moves from 6:03 AM to 5:50 AM, and sunset from 5:59 PM to 5:52 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)	11.9	11.9	11.9	11.9	11.9	11.9	11.9	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)	6:03	6:03	6:02	6:02	6:02	6:01	6:01	6:00	6:00	5:59	5:59	5:58	5:58	5:57	5:57	5:56	5:56	5:55	5:55	5:55	5:54	5:54	5:53	5:53	5:52	5:52	5:51	5:51	5:50	5:50
Sunset (PM)	5:59	5:59	5:59	5:58	5:58	5:58	5:58	5:57	5:57	5:57	5:57	5:56	5:56	5:56	5:55	5:55	5:55	5:55	5:54	5:54	5:54	5:54	5:53	5:53	5:53	5:53	5:52	5:52	5:52	5:52

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

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.29 kWh/m².

For context, solar energy here swings from a low near 3.81 kWh/m² to a high of 5.4 kWh/m² in October across the year — September's 5.29 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)	5.2	5.2	5.2	5.2	5.2	5.2	5.2	5.2	5.2	5.2	5.3	5.3	5.3	5.3	5.3	5.3	5.3	5.3	5.3	5.3	5.4	5.4	5.4	5.4	5.4	5.4	5.4	5.4	5.4	5.4
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	5.2	Bright
2	5.2	Bright
3	5.2	Bright
4	5.2	Bright
5	5.2	Bright
6	5.2	Bright
7	5.2	Bright
8	5.2	Bright
9	5.2	Bright
10	5.2	Bright
11	5.3	Bright
12	5.3	Bright
13	5.3	Bright
14	5.3	Bright
15	5.3	Bright
16	5.3	Bright
17	5.3	Bright
18	5.3	Bright
19	5.3	Bright
20	5.3	Bright
21	5.4	Bright
22	5.4	Bright
23	5.4	Bright
24	5.4	Bright
25	5.4	Bright
26	5.4	Bright
27	5.4	Bright
28	5.4	Bright
29	5.4	Bright
30	5.4	Bright

Planning a trip in September

Is September a good time to visit Careiro?

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

2.7

Sightseeing

4th-best month of the year

4.6

Beach & pool

3rd-best month of the year

September is a weaker month for outdoor sightseeing in Careiro.

What to pack for Careiro in September

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

In September, Careiro sees daytime highs around 33°C and nights near 24°C. Pack light clothes and rain gear. Worth having: sun protection. About 21 days see rain.

light clothesrain gearsun protection

UV index in Careiro in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 11 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Careiro peaks around March 12 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near November 12 at about 10 (very 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	15	14	12	10	10	11	11	10	10	12
Level	Extreme	Extreme	Extreme	Extreme	Extreme	Very high	Extreme	Extreme	Extreme	Extreme	Very high	Extreme

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

Air quality in Careiro 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 Careiro is worst in September — around 36 µg/m³ PM2.5 (poor), about 3.2× the cleanest month (June, 11 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)	15	15	15	15	12	11	14	27	36	33	25	18
Level	Moderate	Moderate	Moderate	Moderate	Good	Good	Moderate	Moderate	Poor	Moderate	Moderate	Moderate

	PM2.5 (µg/m³)	Level
Jan	15	Moderate
Feb	15	Moderate
Mar	15	Moderate
Apr	15	Moderate
May	12	Good
Jun	11	Good
Jul	14	Moderate
Aug	27	Moderate
Sep	36	Poor
Oct	33	Moderate
Nov	25	Moderate
Dec	18	Moderate

Location & terrain

Where is Careiro?

Careiro sits at 3.8°S, 60.4°W, 25 m above sea level, in Brazil. The nearest listed city is Manaquiri, 39 km away.

Topography around Careiro

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

Within 3 km, the terrain around Careiro has only modest variations in elevation — a maximum elevation change of 35 m around an average of 37 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 43 m; within 80 km, only modest variations in elevation — a maximum elevation change of 115 m.

The land around Careiro is covered by trees (96%) within 3 km, trees (88%) within 16 km, and trees (85%) within 80 km.

3 km

35 m

trees 96%

16 km

43 m

trees 88%

80 km

115 m

trees 85%

treesgrasslandwaterwetland

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

September weather nearby: Manaquiri 39 km · Iranduba 57 km · Manacapuru 59 km · Manaus 83 km · Careiro da Várzea 88 km · Borba 111 km · Beruri 112 km · Autazes 139 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 Careiro (-3.7681°, -60.3692°, elevation 25 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	24
2	32	24
3	32	24
4	32	24
5	32	24
6	32	24
7	32	24
8	32	24
9	32	24
10	32	24
11	32	24
12	32	24
13	32	24
14	33	24
15	33	24
16	33	24
17	33	24
18	33	24
19	33	24
20	33	24
21	33	24
22	33	24
23	33	24
24	33	24
25	33	24
26	33	24
27	33	24
28	33	24
29	33	24
30	33	24

	Clearer (%)	Cloudier (%)
1	46	54
2	45	55
3	44	56
4	44	56
5	43	57
6	42	58
7	41	59
8	41	59
9	40	60
10	40	60
11	39	61
12	39	61
13	39	61
14	38	62
15	38	62
16	37	63
17	35	65
18	35	65
19	34	66
20	34	66
21	33	67
22	34	66
23	34	66
24	33	67
25	34	66
26	33	67
27	33	67
28	34	66
29	34	66
30	35	65

	Rain chance (%)
1	70
2	70
3	70
4	70
5	70
6	70
7	70
8	70
9	70
10	70
11	70
12	70
13	70
14	70
15	70
16	70
17	70
18	70
19	71
20	71
21	71
22	71
23	70
24	70
25	70
26	69
27	69
28	69
29	69
30	68

	Muggy (%)	Oppressive (%)	Miserable (%)
1	1	31	68
2	1	31	68
3	1	31	68
4	1	31	68
5	1	31	68
6	1	31	68
7	1	31	68
8	2	30	68
9	2	30	68
10	2	30	68
11	2	29	69
12	2	29	69
13	2	28	70
14	2	28	70
15	2	28	70
16	2	28	70
17	2	27	71
18	2	27	71
19	2	27	71
20	2	27	71
21	2	27	71
22	2	27	71
23	2	27	71
24	2	27	71
25	2	27	71
26	2	28	70
27	2	28	70
28	2	29	69
29	2	29	69
30	2	30	68

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

	Clearer (%)	Cloudier (%)
1	46	54
2	45	55
3	44	56
4	44	56
5	43	57
6	42	58
7	41	59
8	41	59
9	40	60
10	40	60
11	39	61
12	39	61
13	39	61
14	38	62
15	38	62
16	37	63
17	35	65
18	35	65
19	34	66
20	34	66
21	33	67
22	34	66
23	34	66
24	33	67
25	34	66
26	33	67
27	33	67
28	34	66
29	34	66
30	35	65

	Rain chance (%)
1	70
2	70
3	70
4	70
5	70
6	70
7	70
8	70
9	70
10	70
11	70
12	70
13	70
14	70
15	70
16	70
17	70
18	70
19	71
20	71
21	71
22	71
23	70
24	70
25	70
26	69
27	69
28	69
29	69
30	68

	Muggy (%)	Oppressive (%)	Miserable (%)
1	1	31	68
2	1	31	68
3	1	31	68
4	1	31	68
5	1	31	68
6	1	31	68
7	1	31	68
8	2	30	68
9	2	30	68
10	2	30	68
11	2	29	69
12	2	29	69
13	2	28	70
14	2	28	70
15	2	28	70
16	2	28	70
17	2	27	71
18	2	27	71
19	2	27	71
20	2	27	71
21	2	27	71
22	2	27	71
23	2	27	71
24	2	27	71
25	2	27	71
26	2	28	70
27	2	28	70
28	2	29	69
29	2	29	69
30	2	30	68

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

	Clearer (%)	Cloudier (%)
1	46	54
2	45	55
3	44	56
4	44	56
5	43	57
6	42	58
7	41	59
8	41	59
9	40	60
10	40	60
11	39	61
12	39	61
13	39	61
14	38	62
15	38	62
16	37	63
17	35	65
18	35	65
19	34	66
20	34	66
21	33	67
22	34	66
23	34	66
24	33	67
25	34	66
26	33	67
27	33	67
28	34	66
29	34	66
30	35	65

	Rain chance (%)
1	70
2	70
3	70
4	70
5	70
6	70
7	70
8	70
9	70
10	70
11	70
12	70
13	70
14	70
15	70
16	70
17	70
18	70
19	71
20	71
21	71
22	71
23	70
24	70
25	70
26	69
27	69
28	69
29	69
30	68

	Muggy (%)	Oppressive (%)	Miserable (%)
1	1	31	68
2	1	31	68
3	1	31	68
4	1	31	68
5	1	31	68
6	1	31	68
7	1	31	68
8	2	30	68
9	2	30	68
10	2	30	68
11	2	29	69
12	2	29	69
13	2	28	70
14	2	28	70
15	2	28	70
16	2	28	70
17	2	27	71
18	2	27	71
19	2	27	71
20	2	27	71
21	2	27	71
22	2	27	71
23	2	27	71
24	2	27	71
25	2	27	71
26	2	28	70
27	2	28	70
28	2	29	69
29	2	29	69
30	2	30	68