Barreiros weather in September

In September, Barreiros sees average daytime highs of 28°C and overnight lows near 21°C, with 54 mm of rain across 17.5 wet days and about 11.9 hours of daylight. It is the 9th-warmest and 9th-wettest month of the year here.

Day-to-day highs hold fairly steady near 28°C through the month. The sky is clear or mostly clear about 24% of the time in September, and the air most often feels muggy.

Daylight stretches from about 11 h 48 min at the start of September to 12 h 06 min by month's end. Set against the rest of the year, September is Barreiros's 1st-clearest and 4th-windiest month. For the whole year in context, see Barreiros's year-round climate.

Daytime high: 28°; 9th warmest
Overnight low: 21°; 3rd coldest
Rainfall: 54 mm; 17.5 wet days
Daylight: 12 hours; 5:17 AM – 5:14 PM
Cloud cover: 51%; 1st clearest
Wind: 10 km/h; 4th windiest
Solar energy: 5.19 kWh/m²
Travel score: 5.3; out of 10

← August Barreiros 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 28°C through the month.

A typical September day in Barreiros reaches about 28°C in the afternoon and slips back to 21°C overnight — a 6°C spread between the day's warmth and the night's chill. On most days the high lands between 26°C and 29°C. Set against its neighbours, September runs about 1°C warmer than August and about 1°C cooler than 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)	27	27	27	27	27	27	27	27	27	27	27	27	28	28	28	28	28	28	28	28	28	28	28	28	28	28	28	28	28	28
Avg low (°C)	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21	22	22	22	22	22	22	22	22	22	22	22	22

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

How September really feels in Barreiros

Once humidity and wind are folded in, September averages 0 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

September sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Barreiros weather by month

How September compares with the rest of the year at a glance. September is the 9th-warmest and 9th-wettest month here — the current month is highlighted below.

Month	High / Low (°C)	Rainfall (mm)	Wet days	Daylight (hours)	Travel score
Jan	30° / 24°	56	17.3	12.5	4.1
Feb	31° / 24°	61	16.9	12.3	3.8
Mar	31° / 24°	80	19.5	12.1	3.8
Apr	30° / 24°	94	21	11.8	3.8
May	29° / 23°	123	24.1	11.6	3.9
Jun	27° / 22°	141	24.7	11.5	4.3
Jul	27° / 21°	123	24.8	11.5	4.5
Aug	27° / 21°	78	22.2	11.7	4.8
Sep	28° / 21°	54	17.5	11.9	5.3
Oct	29° / 22°	38	14.7	12.2	5.1
Nov	30° / 23°	30	11.5	12.4	5.0
Dec	30° / 23°	32	12.5	12.5	4.6

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 24% of the time in September, the clearest month of the year.

Beyond those clear spells, partly cloudy skies cover about 49% of September, with mostly cloudy or overcast conditions the remaining 27%. Skies tend to open up 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 (%)	70	70	70	70	70	69	69	69	70	70	70	71	71	72	73	73	74	75	75	75	77	77	78	78	78	78	78	78	78	78
Cloudier (%)	30	30	30	30	30	31	31	31	30	30	30	29	29	28	27	27	26	25	25	25	23	23	22	22	22	22	22	22	22	22

	Clearer (%)	Cloudier (%)
1	70	30
2	70	30
3	70	30
4	70	30
5	70	30
6	69	31
7	69	31
8	69	31
9	70	30
10	70	30
11	70	30
12	71	29
13	71	29
14	72	28
15	73	27
16	73	27
17	74	26
18	75	25
19	75	25
20	75	25
21	77	23
22	77	23
23	78	22
24	78	22
25	78	22
26	78	22
27	78	22
28	78	22
29	78	22
30	78	22

Chance of precipitation in September

Any precipitation

Barreiros gets around 54 mm of rain over 17.5 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 58% and peaks near 68% 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 (%)	68	68	67	67	67	67	67	66	66	66	65	64	63	62	61	60	58	57	56	54	53	51	50	49	48	47	46	46	46	46

	Rain chance (%)
1	68
2	68
3	67
4	67
5	67
6	67
7	67
8	66
9	66
10	66
11	65
12	64
13	63
14	62
15	61
16	60
17	58
18	57
19	56
20	54
21	53
22	51
23	50
24	49
25	48
26	47
27	46
28	46
29	46
30	46

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the muggy band about 68% of days. Sticky, muggy-or-worse air turns up on roughly 99% 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
Humid (%)	2	2	2	2	2	2	2	2	2	2	2	2	2	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1
Muggy (%)	70	70	69	69	69	69	69	69	69	69	69	68	68	69	69	69	69	69	68	68	68	67	67	66	65	64	64	63	62	61
Oppressive (%)	28	28	29	29	29	29	29	29	29	29	29	30	30	30	30	30	30	30	31	31	31	32	32	33	34	35	35	36	37	38

	Humid (%)	Muggy (%)	Oppressive (%)
1	2	70	28
2	2	70	28
3	2	69	29
4	2	69	29
5	2	69	29
6	2	69	29
7	2	69	29
8	2	69	29
9	2	69	29
10	2	69	29
11	2	69	29
12	2	68	30
13	2	68	30
14	1	69	30
15	1	69	30
16	1	69	30
17	1	69	30
18	1	69	30
19	1	68	31
20	1	68	31
21	1	68	31
22	1	67	32
23	1	67	32
24	1	66	33
25	1	65	34
26	1	64	35
27	1	64	35
28	1	63	36
29	1	62	37
30	1	61	38

Wind in September

Winds average 10 km/h in September.

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

Sunrise & sunset in September

DaylightNight

Daylight runs from about 11 h 48 min at the start of September to 12 h 06 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 18 minutes over September. Sunrise moves from 5:26 AM to 5:08 AM, and sunset from 5:15 PM to 5:12 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)	11.8	11.8	11.8	11.9	11.9	11.9	11.9	11.9	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	12.1	12.1	12.1
Sunrise (AM)	5:26	5:25	5:24	5:24	5:23	5:23	5:22	5:21	5:21	5:20	5:20	5:19	5:18	5:18	5:17	5:17	5:16	5:15	5:15	5:14	5:13	5:13	5:12	5:12	5:11	5:10	5:10	5:09	5:09	5:08
Sunset (PM)	5:15	5:15	5:15	5:15	5:15	5:15	5:15	5:15	5:14	5:14	5:14	5:14	5:14	5:14	5:14	5:14	5:14	5:13	5:13	5:13	5:13	5:13	5:13	5:13	5:13	5:12	5:12	5:12	5:12	5:12

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	11.8	5:26	5:15
2	11.8	5:25	5:15
3	11.8	5:24	5:15
4	11.9	5:24	5:15
5	11.9	5:23	5:15
6	11.9	5:23	5:15
7	11.9	5:22	5:15
8	11.9	5:21	5:15
9	11.9	5:21	5:14
10	11.9	5:20	5:14
11	11.9	5:20	5:14
12	11.9	5:19	5:14
13	11.9	5:18	5:14
14	11.9	5:18	5:14
15	11.9	5:17	5:14
16	12.0	5:17	5:14
17	12.0	5:16	5:14
18	12.0	5:15	5:13
19	12.0	5:15	5:13
20	12.0	5:14	5:13
21	12.0	5:13	5:13
22	12.0	5:13	5:13
23	12.0	5:12	5:13
24	12.0	5:12	5:13
25	12.0	5:11	5:13
26	12.0	5:10	5:12
27	12.0	5:10	5:12
28	12.1	5:09	5:12
29	12.1	5:09	5:12
30	12.1	5:08	5:12

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.19 kWh/m².

For context, solar energy here swings from a low near 3.87 kWh/m² to a high of 5.85 kWh/m² in November across the year — September's 5.19 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)	4.9	4.9	4.9	4.9	4.9	5.0	5.0	5.0	5.0	5.0	5.0	5.1	5.1	5.1	5.2	5.2	5.2	5.2	5.3	5.3	5.3	5.4	5.4	5.4	5.4	5.5	5.5	5.5	5.5	5.5
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	4.9	Bright
2	4.9	Bright
3	4.9	Bright
4	4.9	Bright
5	4.9	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	5.1	Bright
13	5.1	Bright
14	5.1	Bright
15	5.2	Bright
16	5.2	Bright
17	5.2	Bright
18	5.2	Bright
19	5.3	Bright
20	5.3	Bright
21	5.3	Bright
22	5.4	Bright
23	5.4	Bright
24	5.4	Bright
25	5.4	Bright
26	5.5	Bright
27	5.5	Bright
28	5.5	Bright
29	5.5	Bright
30	5.5	Bright

Planning a trip in September

Hazard calendar for Barreiros

In seasonPeak

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

Barreiros's rainy season runs March–August, 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 Barreiros?

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

5.3

Sightseeing

1st-best month of the year

5.7

Beach & pool

5th-best month of the year

September is a reasonable time to visit Barreiros for sightseeing.

What to pack for Barreiros in September

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

In September, Barreiros sees daytime highs around 28°C and nights near 21°C. Pack light clothes and rain gear. Worth having: sun protection. About 18 days see rain.

light clothesrain gearsun protection

Sea temperature near Barreiros in September

The nearest coast averages about 26°C in September — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea offshore is warmest in April at about 29°C and coldest in August near 26°C.

The water stays above 20°C all year — warm enough for a swim any month.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Sea temperature (°C)	28	28	29	29	28	27	26	26	26	27	27	27
Comfort	Warm	Tropical	Tropical	Tropical	Tropical	Warm	Warm	Warm	Warm	Warm	Warm	Warm

	Sea temperature (°C)	Comfort
Jan	28	Warm
Feb	28	Tropical
Mar	29	Tropical
Apr	29	Tropical
May	28	Tropical
Jun	27	Warm
Jul	26	Warm
Aug	26	Warm
Sep	26	Warm
Oct	27	Warm
Nov	27	Warm
Dec	27	Warm

UV index in Barreiros 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 Barreiros peaks around March 14 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 23 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)	14	14	15	13	11	10	10	10	12	12	12	12
Level	Extreme	Extreme	Extreme	Extreme	Extreme	Very high	Very high	Very high	Extreme	Extreme	Extreme	Extreme

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

Location & terrain

Where is Barreiros?

Barreiros sits at 8.8°S, 35.2°W, 28 m above sea level, in Brazil. The nearest listed city is São José da Coroa Grande, 10 km away.

Topography around Barreiros

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

Within 3 km, the terrain around Barreiros has only modest variations in elevation — a maximum elevation change of 103 m around an average of 34 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 154 m; within 80 km, large variations in elevation — a maximum elevation change of 821 m.

The land around Barreiros is covered by trees (48%) and grassland (40%) within 3 km, grassland (37%), trees (34%) and water (24%) within 16 km, and grassland (41%), water (34%) and trees (20%) within 80 km.

3 km

103 m

trees 48%

16 km

154 m

grassland 37%

80 km

821 m

grassland 41%

treesgrasslandcroplandartificial surfaceswatermangroves

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

September weather nearby: São José da Coroa Grande 10 km · Tamandaré 12 km · Rio Formoso 17 km · Maragogi 22 km · Sirinhaém 26 km · Gameleira 34 km · Porto Calvo 34 km · Água Preta 40 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 Barreiros (-8.8183°, -35.1864°, elevation 28 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. Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. 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	27	21
2	27	21
3	27	21
4	27	21
5	27	21
6	27	21
7	27	21
8	27	21
9	27	21
10	27	21
11	27	21
12	27	21
13	28	21
14	28	21
15	28	21
16	28	21
17	28	21
18	28	21
19	28	22
20	28	22
21	28	22
22	28	22
23	28	22
24	28	22
25	28	22
26	28	22
27	28	22
28	28	22
29	28	22
30	28	22

	Clearer (%)	Cloudier (%)
1	70	30
2	70	30
3	70	30
4	70	30
5	70	30
6	69	31
7	69	31
8	69	31
9	70	30
10	70	30
11	70	30
12	71	29
13	71	29
14	72	28
15	73	27
16	73	27
17	74	26
18	75	25
19	75	25
20	75	25
21	77	23
22	77	23
23	78	22
24	78	22
25	78	22
26	78	22
27	78	22
28	78	22
29	78	22
30	78	22

	Rain chance (%)
1	68
2	68
3	67
4	67
5	67
6	67
7	67
8	66
9	66
10	66
11	65
12	64
13	63
14	62
15	61
16	60
17	58
18	57
19	56
20	54
21	53
22	51
23	50
24	49
25	48
26	47
27	46
28	46
29	46
30	46

	Humid (%)	Muggy (%)	Oppressive (%)
1	2	70	28
2	2	70	28
3	2	69	29
4	2	69	29
5	2	69	29
6	2	69	29
7	2	69	29
8	2	69	29
9	2	69	29
10	2	69	29
11	2	69	29
12	2	68	30
13	2	68	30
14	1	69	30
15	1	69	30
16	1	69	30
17	1	69	30
18	1	69	30
19	1	68	31
20	1	68	31
21	1	68	31
22	1	67	32
23	1	67	32
24	1	66	33
25	1	65	34
26	1	64	35
27	1	64	35
28	1	63	36
29	1	62	37
30	1	61	38

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

	Clearer (%)	Cloudier (%)
1	70	30
2	70	30
3	70	30
4	70	30
5	70	30
6	69	31
7	69	31
8	69	31
9	70	30
10	70	30
11	70	30
12	71	29
13	71	29
14	72	28
15	73	27
16	73	27
17	74	26
18	75	25
19	75	25
20	75	25
21	77	23
22	77	23
23	78	22
24	78	22
25	78	22
26	78	22
27	78	22
28	78	22
29	78	22
30	78	22

	Rain chance (%)
1	68
2	68
3	67
4	67
5	67
6	67
7	67
8	66
9	66
10	66
11	65
12	64
13	63
14	62
15	61
16	60
17	58
18	57
19	56
20	54
21	53
22	51
23	50
24	49
25	48
26	47
27	46
28	46
29	46
30	46

	Humid (%)	Muggy (%)	Oppressive (%)
1	2	70	28
2	2	70	28
3	2	69	29
4	2	69	29
5	2	69	29
6	2	69	29
7	2	69	29
8	2	69	29
9	2	69	29
10	2	69	29
11	2	69	29
12	2	68	30
13	2	68	30
14	1	69	30
15	1	69	30
16	1	69	30
17	1	69	30
18	1	69	30
19	1	68	31
20	1	68	31
21	1	68	31
22	1	67	32
23	1	67	32
24	1	66	33
25	1	65	34
26	1	64	35
27	1	64	35
28	1	63	36
29	1	62	37
30	1	61	38

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

	Clearer (%)	Cloudier (%)
1	70	30
2	70	30
3	70	30
4	70	30
5	70	30
6	69	31
7	69	31
8	69	31
9	70	30
10	70	30
11	70	30
12	71	29
13	71	29
14	72	28
15	73	27
16	73	27
17	74	26
18	75	25
19	75	25
20	75	25
21	77	23
22	77	23
23	78	22
24	78	22
25	78	22
26	78	22
27	78	22
28	78	22
29	78	22
30	78	22

	Rain chance (%)
1	68
2	68
3	67
4	67
5	67
6	67
7	67
8	66
9	66
10	66
11	65
12	64
13	63
14	62
15	61
16	60
17	58
18	57
19	56
20	54
21	53
22	51
23	50
24	49
25	48
26	47
27	46
28	46
29	46
30	46

	Humid (%)	Muggy (%)	Oppressive (%)
1	2	70	28
2	2	70	28
3	2	69	29
4	2	69	29
5	2	69	29
6	2	69	29
7	2	69	29
8	2	69	29
9	2	69	29
10	2	69	29
11	2	69	29
12	2	68	30
13	2	68	30
14	1	69	30
15	1	69	30
16	1	69	30
17	1	69	30
18	1	69	30
19	1	68	31
20	1	68	31
21	1	68	31
22	1	67	32
23	1	67	32
24	1	66	33
25	1	65	34
26	1	64	35
27	1	64	35
28	1	63	36
29	1	62	37
30	1	61	38