Riachão do Dantas weather in September

In September, Riachão do Dantas sees average daytime highs of 28°C and overnight lows near 20°C, with 44 mm of rain across 14.5 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 26% 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 Riachão do Dantas's 2nd-clearest and 4th-windiest month. For the whole year in context, see Riachão do Dantas's year-round climate.

Daytime high: 28°; 9th warmest
Overnight low: 20°; 3rd coldest
Rainfall: 44 mm; 14.5 wet days
Daylight: 11 h 54 min; 5:27 AM – 5:23 PM
Cloud cover: 51%; 2nd clearest
Wind: 11 km/h; 4th windiest
Solar energy: 5.23 kWh/m²
Travel score: 5.7; out of 10

Riachão do Dantas is human settlement in Brazil.

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

← August Riachão do Dantas 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 Riachão do Dantas reaches about 28°C in the afternoon and slips back to 20°C overnight — a 8°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 2°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	27	27	28	28	28	28	28	28	28	28	28	28	28	28	28	29	29	29
Avg low (°C)	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	21	21	21	21

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

How September really feels in Riachão do Dantas

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.

Riachão do Dantas 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	31° / 23°	47	11.3	12.6	4.2
Feb	31° / 23°	46	12.4	12.4	4.0
Mar	31° / 23°	52	14.2	12.1	4.0
Apr	30° / 23°	67	15.8	11.8	4.2
May	28° / 22°	83	19.7	11.5	4.7
Jun	27° / 21°	83	21	11.4	4.9
Jul	26° / 20°	70	21	11.4	5.1
Aug	26° / 19°	62	19.4	11.6	5.3
Sep	28° / 20°	44	14.5	11.9	5.7
Oct	29° / 21°	33	9.5	12.2	5.5
Nov	31° / 22°	35	8.5	12.5	4.9
Dec	31° / 23°	33	8.4	12.6	4.5

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 26% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 45% of September, with mostly cloudy or overcast conditions the remaining 29%. 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 (%)	65	66	66	66	66	66	67	67	67	68	68	68	69	69	70	70	71	72	73	73	74	74	75	76	76	76	76	76	76	75
Cloudier (%)	35	34	34	34	34	34	33	33	33	32	32	32	31	31	30	30	29	28	27	27	26	26	25	24	24	24	24	24	24	25

	Clearer (%)	Cloudier (%)
1	65	35
2	66	34
3	66	34
4	66	34
5	66	34
6	66	34
7	67	33
8	67	33
9	67	33
10	68	32
11	68	32
12	68	32
13	69	31
14	69	31
15	70	30
16	70	30
17	71	29
18	72	28
19	73	27
20	73	27
21	74	26
22	74	26
23	75	25
24	76	24
25	76	24
26	76	24
27	76	24
28	76	24
29	76	24
30	75	25

Chance of precipitation in September

Any precipitation

Riachão do Dantas gets around 44 mm of rain over 14.5 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 48% and peaks near 55% 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 (%)	55	55	55	55	55	55	55	54	54	54	54	54	53	52	51	50	49	48	47	46	44	43	42	41	40	39	38	37	36	35

	Rain chance (%)
1	55
2	55
3	55
4	55
5	55
6	55
7	55
8	54
9	54
10	54
11	54
12	54
13	53
14	52
15	51
16	50
17	49
18	48
19	47
20	46
21	44
22	43
23	42
24	41
25	40
26	39
27	38
28	37
29	36
30	35

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 86% of days. Sticky, muggy-or-worse air turns up on roughly 95% 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 (%)	9	9	9	9	9	8	8	8	8	7	7	7	6	6	5	5	5	4	4	4	4	3	3	3	3	3	3	3	3	2
Muggy (%)	87	87	86	86	86	87	86	86	86	86	86	86	87	87	87	87	87	88	88	87	87	87	87	86	85	85	84	83	83	83
Oppressive (%)	4	4	5	5	5	5	6	6	6	7	7	7	7	7	8	8	8	8	8	9	9	10	10	11	12	12	13	14	14	15

	Humid (%)	Muggy (%)	Oppressive (%)
1	9	87	4
2	9	87	4
3	9	86	5
4	9	86	5
5	9	86	5
6	8	87	5
7	8	86	6
8	8	86	6
9	8	86	6
10	7	86	7
11	7	86	7
12	7	86	7
13	6	87	7
14	6	87	7
15	5	87	8
16	5	87	8
17	5	87	8
18	4	88	8
19	4	88	8
20	4	87	9
21	4	87	9
22	3	87	10
23	3	87	10
24	3	86	11
25	3	85	12
26	3	85	12
27	3	84	13
28	3	83	14
29	3	83	14
30	2	83	15

Wind in September

Winds average 11 km/h in September.

Across September, daily wind ranges from about 11 km/h on the calmest days to 12 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)	11	11	11	11	11	11	11	11	11	11	11	11	11	11	11	11	11	11	12	12	12	12	12	12	12	12	12	12	12	12
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	11	calm
2	11	calm
3	11	calm
4	11	calm
5	11	calm
6	11	calm
7	11	calm
8	11	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	12	calm
20	12	calm
21	12	calm
22	12	calm
23	12	calm
24	12	calm
25	12	calm
26	12	calm
27	12	calm
28	12	calm
29	12	calm
30	12	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 5:37 AM to 5:18 AM, and sunset from 5:24 PM to 5:23 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	11.8	11.8	11.8	11.8	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	12.1	12.1	12.1	12.1
Sunrise (AM)	5:37	5:36	5:36	5:35	5:34	5:34	5:33	5:32	5:32	5:31	5:30	5:30	5:29	5:28	5:28	5:27	5:26	5:26	5:25	5:24	5:24	5:23	5:22	5:22	5:21	5:20	5:20	5:19	5:18	5:18
Sunset (PM)	5:24	5:24	5:24	5:24	5:24	5:24	5:24	5:24	5:24	5:24	5:24	5:24	5:24	5:24	5:23	5:23	5:23	5:23	5:23	5:23	5:23	5:23	5:23	5:23	5:23	5:23	5:23	5:23	5:23	5:23

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	11.8	5:37	5:24
2	11.8	5:36	5:24
3	11.8	5:36	5:24
4	11.8	5:35	5:24
5	11.8	5:34	5:24
6	11.8	5:34	5:24
7	11.8	5:33	5:24
8	11.9	5:32	5:24
9	11.9	5:32	5:24
10	11.9	5:31	5:24
11	11.9	5:30	5:24
12	11.9	5:30	5:24
13	11.9	5:29	5:24
14	11.9	5:28	5:24
15	11.9	5:28	5:23
16	11.9	5:27	5:23
17	12.0	5:26	5:23
18	12.0	5:26	5:23
19	12.0	5:25	5:23
20	12.0	5:24	5:23
21	12.0	5:24	5:23
22	12.0	5:23	5:23
23	12.0	5:22	5:23
24	12.0	5:22	5:23
25	12.0	5:21	5:23
26	12.0	5:20	5:23
27	12.1	5:20	5:23
28	12.1	5:19	5:23
29	12.1	5:18	5:23
30	12.1	5:18	5:23

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.23 kWh/m².

For context, solar energy here swings from a low near 3.78 kWh/m² to a high of 6.25 kWh/m² in December across the year — September's 5.23 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	5.0	5.0	5.0	5.0	5.0	5.0	5.1	5.1	5.1	5.2	5.2	5.2	5.3	5.3	5.3	5.3	5.4	5.4	5.5	5.5	5.5	5.5	5.6	5.6	5.6	5.6
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	5.0	Bright
6	5.0	Bright
7	5.0	Bright
8	5.0	Bright
9	5.0	Bright
10	5.0	Bright
11	5.1	Bright
12	5.1	Bright
13	5.1	Bright
14	5.2	Bright
15	5.2	Bright
16	5.2	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	5.5	Bright
24	5.5	Bright
25	5.5	Bright
26	5.5	Bright
27	5.6	Bright
28	5.6	Bright
29	5.6	Bright
30	5.6	Bright

Planning a trip in September

Is September a good time to visit Riachão do Dantas?

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

5.7

Sightseeing

1st-best month of the year

6.2

Beach & pool

5th-best month of the year

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

What to pack for Riachão do Dantas in September

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

In September, Riachão do Dantas sees daytime highs around 28°C and nights near 20°C. Pack light clothes and rain gear. Worth having: sun protection. About 15 days see rain.

light clothesrain gearsun protection

Sea temperature near Riachão do Dantas 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 at the nearest coast (about 51 km away) is warmest in April at about 28°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)	27	28	28	28	28	27	26	26	26	26	26	27
Comfort	Warm	Warm	Tropical	Tropical	Warm	Warm	Warm	Warm	Warm	Warm	Warm	Warm

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

UV index in Riachão do Dantas 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 Riachão do Dantas peaks around February 17 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 11 at about 9 (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)	13	15	14	13	10	9	9	10	12	13	13	12
Level	Extreme	Extreme	Extreme	Extreme	Very high	Very high	Very high	Very high	Extreme	Extreme	Extreme	Extreme

	UV index (midday)	Level
Jan	13	Extreme
Feb	15	Extreme
Mar	14	Extreme
Apr	13	Extreme
May	10	Very high
Jun	9	Very high
Jul	9	Very high
Aug	10	Very high
Sep	12	Extreme
Oct	13	Extreme
Nov	13	Extreme
Dec	12	Extreme

Location & terrain

Where is Riachão do Dantas?

Riachão do Dantas sits at 11.1°S, 37.7°W, 179 m above sea level, in Brazil. The nearest listed city is Boquim, 14 km away.

Topography around Riachão do Dantas

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

Within 3 km, the terrain around Riachão do Dantas has only modest variations in elevation — a maximum elevation change of 86 m around an average of 164 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 322 m; within 80 km, large variations in elevation — a maximum elevation change of 691 m.

The land around Riachão do Dantas is covered by grassland (86%) within 3 km, grassland (78%) within 16 km, and grassland (55%) within 80 km.

3 km

86 m

grassland 86%

16 km

322 m

grassland 78%

80 km

691 m

grassland 55%

treesshrubsgrasslandcroplandartificial surfaceswatermangroves

← August Riachão do Dantas year-round climate October →Best places to visit in September

September weather nearby: Boquim 14 km · Lagarto 19 km · Itabaianinha 24 km · Salgado 28 km · Tobias Barreto 32 km · Umbaúba 36 km · Simão Dias 38 km · Estância 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 Riachão do Dantas (-11.0689°, -37.725°, elevation 179 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	20
2	27	20
3	27	20
4	27	20
5	27	20
6	27	20
7	27	20
8	27	20
9	27	20
10	27	20
11	27	20
12	27	20
13	27	20
14	27	20
15	28	20
16	28	20
17	28	20
18	28	20
19	28	20
20	28	20
21	28	20
22	28	20
23	28	20
24	28	20
25	28	20
26	28	20
27	28	21
28	29	21
29	29	21
30	29	21

	Clearer (%)	Cloudier (%)
1	65	35
2	66	34
3	66	34
4	66	34
5	66	34
6	66	34
7	67	33
8	67	33
9	67	33
10	68	32
11	68	32
12	68	32
13	69	31
14	69	31
15	70	30
16	70	30
17	71	29
18	72	28
19	73	27
20	73	27
21	74	26
22	74	26
23	75	25
24	76	24
25	76	24
26	76	24
27	76	24
28	76	24
29	76	24
30	75	25

	Rain chance (%)
1	55
2	55
3	55
4	55
5	55
6	55
7	55
8	54
9	54
10	54
11	54
12	54
13	53
14	52
15	51
16	50
17	49
18	48
19	47
20	46
21	44
22	43
23	42
24	41
25	40
26	39
27	38
28	37
29	36
30	35

	Humid (%)	Muggy (%)	Oppressive (%)
1	9	87	4
2	9	87	4
3	9	86	5
4	9	86	5
5	9	86	5
6	8	87	5
7	8	86	6
8	8	86	6
9	8	86	6
10	7	86	7
11	7	86	7
12	7	86	7
13	6	87	7
14	6	87	7
15	5	87	8
16	5	87	8
17	5	87	8
18	4	88	8
19	4	88	8
20	4	87	9
21	4	87	9
22	3	87	10
23	3	87	10
24	3	86	11
25	3	85	12
26	3	85	12
27	3	84	13
28	3	83	14
29	3	83	14
30	2	83	15

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

	Clearer (%)	Cloudier (%)
1	65	35
2	66	34
3	66	34
4	66	34
5	66	34
6	66	34
7	67	33
8	67	33
9	67	33
10	68	32
11	68	32
12	68	32
13	69	31
14	69	31
15	70	30
16	70	30
17	71	29
18	72	28
19	73	27
20	73	27
21	74	26
22	74	26
23	75	25
24	76	24
25	76	24
26	76	24
27	76	24
28	76	24
29	76	24
30	75	25

	Rain chance (%)
1	55
2	55
3	55
4	55
5	55
6	55
7	55
8	54
9	54
10	54
11	54
12	54
13	53
14	52
15	51
16	50
17	49
18	48
19	47
20	46
21	44
22	43
23	42
24	41
25	40
26	39
27	38
28	37
29	36
30	35

	Humid (%)	Muggy (%)	Oppressive (%)
1	9	87	4
2	9	87	4
3	9	86	5
4	9	86	5
5	9	86	5
6	8	87	5
7	8	86	6
8	8	86	6
9	8	86	6
10	7	86	7
11	7	86	7
12	7	86	7
13	6	87	7
14	6	87	7
15	5	87	8
16	5	87	8
17	5	87	8
18	4	88	8
19	4	88	8
20	4	87	9
21	4	87	9
22	3	87	10
23	3	87	10
24	3	86	11
25	3	85	12
26	3	85	12
27	3	84	13
28	3	83	14
29	3	83	14
30	2	83	15

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

	Clearer (%)	Cloudier (%)
1	65	35
2	66	34
3	66	34
4	66	34
5	66	34
6	66	34
7	67	33
8	67	33
9	67	33
10	68	32
11	68	32
12	68	32
13	69	31
14	69	31
15	70	30
16	70	30
17	71	29
18	72	28
19	73	27
20	73	27
21	74	26
22	74	26
23	75	25
24	76	24
25	76	24
26	76	24
27	76	24
28	76	24
29	76	24
30	75	25

	Rain chance (%)
1	55
2	55
3	55
4	55
5	55
6	55
7	55
8	54
9	54
10	54
11	54
12	54
13	53
14	52
15	51
16	50
17	49
18	48
19	47
20	46
21	44
22	43
23	42
24	41
25	40
26	39
27	38
28	37
29	36
30	35

	Humid (%)	Muggy (%)	Oppressive (%)
1	9	87	4
2	9	87	4
3	9	86	5
4	9	86	5
5	9	86	5
6	8	87	5
7	8	86	6
8	8	86	6
9	8	86	6
10	7	86	7
11	7	86	7
12	7	86	7
13	6	87	7
14	6	87	7
15	5	87	8
16	5	87	8
17	5	87	8
18	4	88	8
19	4	88	8
20	4	87	9
21	4	87	9
22	3	87	10
23	3	87	10
24	3	86	11
25	3	85	12
26	3	85	12
27	3	84	13
28	3	83	14
29	3	83	14
30	2	83	15