Ilhéus weather in September

In September, Ilhéus sees average daytime highs of 25°C and overnight lows near 22°C, with 61 mm of rain across 15.1 wet days and about 11.9 hours of daylight. It is the 10th-warmest and 12th-wettest month of the year here.

Day-to-day highs hold fairly steady near 25°C through the month. The sky is clear or mostly clear about 44% of the time in September, and the air most often feels muggy.

Daylight stretches from about 11 h 42 min at the start of September to 12 h 06 min by month's end. Set against the rest of the year, September is Ilhéus's 1st-clearest and 3rd-windiest month. For the whole year in context, see Ilhéus's year-round climate.

Daytime high: 25°; 10th warmest
Overnight low: 22°; 4th coldest
Rainfall: 61 mm; 15.1 wet days
Daylight: 11 h 54 min; 5:33 AM – 5:28 PM
Cloud cover: 48%; 1st clearest
Wind: 13 km/h; 3rd windiest
Solar energy: 5.21 kWh/m²
Travel score: 6.2; out of 10

← August Ilhéus 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 25°C through the month.

A typical September day in Ilhéus reaches about 25°C in the afternoon and slips back to 22°C overnight — a 3°C spread between the day's warmth and the night's chill. On most days the high lands between 24°C and 26°C. Set against its neighbours, September runs on par with 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)	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25	26	26	26	26	26	26	26	26	26	26	26
Avg low (°C)	22	22	22	22	22	22	22	22	22	22	22	22	22	22	22	22	22	22	22	22	22	22	22	22	23	23	23	23	23	23

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

Ilhéus weather by month

How September compares with the rest of the year at a glance. September is the 10th-warmest and 12th-wettest month here — the current month is highlighted below.

Month	High / Low (°C)	Rainfall (mm)	Wet days	Daylight (hours)	Travel score
Jan	28° / 25°	95	20.4	12.8	4.9
Feb	28° / 25°	81	19.4	12.5	4.5
Mar	28° / 25°	116	23.1	12.1	4.4
Apr	28° / 24°	131	23.1	11.7	4.6
May	26° / 23°	110	19.1	11.3	5.3
Jun	25° / 22°	98	19.4	11.1	5.5
Jul	25° / 21°	95	20.1	11.2	5.6
Aug	25° / 21°	70	17.7	11.5	5.9
Sep	25° / 22°	61	15.1	11.9	6.2
Oct	26° / 23°	83	16.1	12.3	5.9
Nov	27° / 24°	125	17.9	12.7	5.2
Dec	28° / 25°	110	17.9	12.9	5.3

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 44% of the time in September, the clearest month of the year.

Beyond those clear spells, partly cloudy skies cover about 31% of September, with mostly cloudy or overcast conditions the remaining 25%.

	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 (%)	76	75	75	75	76	75	75	76	76	77	77	77	77	77	77	78	78	77	76	77	76	75	74	74	73	72	71	71	70	70
Cloudier (%)	24	25	25	25	24	25	25	24	24	23	23	23	23	23	23	22	22	23	24	23	24	25	26	26	27	28	29	29	30	30

	Clearer (%)	Cloudier (%)
1	76	24
2	75	25
3	75	25
4	75	25
5	76	24
6	75	25
7	75	25
8	76	24
9	76	24
10	77	23
11	77	23
12	77	23
13	77	23
14	77	23
15	77	23
16	78	22
17	78	22
18	77	23
19	76	24
20	77	23
21	76	24
22	75	25
23	74	26
24	74	26
25	73	27
26	72	28
27	71	29
28	71	29
29	70	30
30	70	30

Chance of precipitation in September

Any precipitation

Ilhéus gets around 61 mm of rain over 15.1 wet days in September, the driest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 50% and peaks near 52% 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 (%)	52	52	52	52	52	52	52	51	51	51	50	50	50	50	50	49	49	49	49	49	49	49	49	49	49	49	49	49	49	49

	Rain chance (%)
1	52
2	52
3	52
4	52
5	52
6	52
7	52
8	51
9	51
10	51
11	50
12	50
13	50
14	50
15	50
16	49
17	49
18	49
19	49
20	49
21	49
22	49
23	49
24	49
25	49
26	49
27	49
28	49
29	49
30	49

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 63% of days. Sticky, muggy-or-worse air turns up on roughly 94% 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 (%)	8	8	8	8	8	8	8	8	8	7	7	7	6	6	5	5	5	4	4	4	4	4	4	4	4	4	4	4	4	4
Muggy (%)	74	74	73	73	73	72	72	71	71	71	70	69	69	68	68	66	65	64	63	61	59	57	55	53	51	50	48	46	44	43
Oppressive (%)	18	18	19	19	19	20	20	21	21	22	23	24	25	26	27	29	30	32	33	35	37	39	41	43	45	46	48	50	52	53

	Humid (%)	Muggy (%)	Oppressive (%)
1	8	74	18
2	8	74	18
3	8	73	19
4	8	73	19
5	8	73	19
6	8	72	20
7	8	72	20
8	8	71	21
9	8	71	21
10	7	71	22
11	7	70	23
12	7	69	24
13	6	69	25
14	6	68	26
15	5	68	27
16	5	66	29
17	5	65	30
18	4	64	32
19	4	63	33
20	4	61	35
21	4	59	37
22	4	57	39
23	4	55	41
24	4	53	43
25	4	51	45
26	4	50	46
27	4	48	48
28	4	46	50
29	4	44	52
30	4	43	53

Wind in September

Winds average 13 km/h in September.

Across September, daily wind ranges from about 12 km/h on the calmest days to 13 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)	12	12	13	13	13	13	13	13	13	13	13	13	13	13	13	13	13	13	13	13	13	13	13	13	13	13	13	13	13	13
Feels	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze

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

Sunrise & sunset in September

DaylightNight

Daylight runs from about 11 h 42 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 24 minutes over September. Sunrise moves from 5:45 AM to 5:22 AM, and sunset from 5:27 PM to 5:29 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)	11.7	11.7	11.7	11.8	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	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.1	12.1	12.1	12.1	12.1
Sunrise (AM)	5:45	5:44	5:43	5:42	5:42	5:41	5:40	5:39	5:38	5:38	5:37	5:36	5:35	5:34	5:34	5:33	5:32	5:31	5:31	5:30	5:29	5:28	5:27	5:27	5:26	5:25	5:24	5:23	5:23	5:22
Sunset (PM)	5:27	5:27	5:27	5:27	5:27	5:27	5:28	5:28	5:28	5:28	5:28	5:28	5:28	5:28	5:28	5:28	5:28	5:28	5:28	5:28	5:28	5:28	5:28	5:28	5:29	5:29	5:29	5:29	5:29	5:29

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	11.7	5:45	5:27
2	11.7	5:44	5:27
3	11.7	5:43	5:27
4	11.8	5:42	5:27
5	11.8	5:42	5:27
6	11.8	5:41	5:27
7	11.8	5:40	5:28
8	11.8	5:39	5:28
9	11.8	5:38	5:28
10	11.8	5:38	5:28
11	11.8	5:37	5:28
12	11.9	5:36	5:28
13	11.9	5:35	5:28
14	11.9	5:34	5:28
15	11.9	5:34	5:28
16	11.9	5:33	5:28
17	11.9	5:32	5:28
18	11.9	5:31	5:28
19	12.0	5:31	5:28
20	12.0	5:30	5:28
21	12.0	5:29	5:28
22	12.0	5:28	5:28
23	12.0	5:27	5:28
24	12.0	5:27	5:28
25	12.0	5:26	5:29
26	12.1	5:25	5:29
27	12.1	5:24	5:29
28	12.1	5:23	5:29
29	12.1	5:23	5:29
30	12.1	5:22	5:29

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.21 kWh/m².

For context, solar energy here swings from a low near 3.75 kWh/m² to a high of 6.21 kWh/m² in January across the year — September's 5.21 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	5.0	5.0	5.0	5.0	5.0	5.1	5.1	5.1	5.1	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	5.4	5.4	5.4	5.4	5.4	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	5.0	Bright
3	5.0	Bright
4	5.0	Bright
5	5.0	Bright
6	5.0	Bright
7	5.1	Bright
8	5.1	Bright
9	5.1	Bright
10	5.1	Bright
11	5.2	Bright
12	5.2	Bright
13	5.2	Bright
14	5.2	Bright
15	5.2	Bright
16	5.3	Bright
17	5.3	Bright
18	5.3	Bright
19	5.3	Bright
20	5.3	Bright
21	5.3	Bright
22	5.3	Bright
23	5.3	Bright
24	5.4	Bright
25	5.4	Bright
26	5.4	Bright
27	5.4	Bright
28	5.4	Bright
29	5.5	Bright
30	5.5	Bright

Planning a trip in September

Is September a good time to visit Ilhéus?

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

6.2

Sightseeing

1st-best month of the year

5.7

Beach & pool

1st-best month of the year

September is a reasonable time to visit Ilhéus for sightseeing.

What to pack for Ilhéus in September

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

In September, Ilhéus sees daytime highs around 25°C and nights near 22°C. Pack rain gear. Worth having: light clothes and sun protection. About 15 days see rain.

rain gearlight clothessun protection

Sea temperature near Ilhéus in September

The nearest coast averages about 25°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 19 km away) is warmest in March at about 28°C and coldest in August near 25°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	28	28	27	26	26	25	25	26	27	27
Comfort	Warm	Tropical	Tropical	Tropical	Warm	Warm	Warm	Warm	Warm	Warm	Warm	Warm

	Sea temperature (°C)	Comfort
Jan	28	Warm
Feb	28	Tropical
Mar	28	Tropical
Apr	28	Tropical
May	27	Warm
Jun	26	Warm
Jul	26	Warm
Aug	25	Warm
Sep	25	Warm
Oct	26	Warm
Nov	27	Warm
Dec	27	Warm

UV index in Ilhéus 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 Ilhéus peaks around February 18 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 22 at about 8 (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	12	9	8	8	9	11	13	14	13
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	12	Extreme
May	9	Very high
Jun	8	Very high
Jul	8	Very high
Aug	9	Very high
Sep	11	Extreme
Oct	13	Extreme
Nov	14	Extreme
Dec	13	Extreme

Location & terrain

Where is Ilhéus?

Ilhéus sits at 14.8°S, 39.0°W, in Brazil. The nearest listed city is Itabuna, 27 km away.

Topography around Ilhéus

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

Within 3 km, the terrain around Ilhéus has only modest variations in elevation — a maximum elevation change of 72 m around an average of 7 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 181 m; within 80 km, large variations in elevation — a maximum elevation change of 1,034 m.

The land around Ilhéus is covered by water (55%) and artificial surfaces (22%) within 3 km, water (54%) and trees (40%) within 16 km, and trees (51%) and water (32%) within 80 km.

3 km

72 m

water 55%

16 km

181 m

water 54%

80 km

1,034 m

trees 51%

treesgrasslandartificial surfacesbare terrainwatermangroves

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

September weather nearby: Itabuna 27 km · Uruçuca 35 km · Itajuípe 39 km · Una 55 km · Itacaré 58 km · Coaraci 59 km · Ibicaraí 60 km · Ubaitaba 63 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 Ilhéus (-14.7991°, -39.0323°), 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	25	22
2	25	22
3	25	22
4	25	22
5	25	22
6	25	22
7	25	22
8	25	22
9	25	22
10	25	22
11	25	22
12	25	22
13	25	22
14	25	22
15	25	22
16	25	22
17	25	22
18	25	22
19	25	22
20	26	22
21	26	22
22	26	22
23	26	22
24	26	22
25	26	23
26	26	23
27	26	23
28	26	23
29	26	23
30	26	23

	Clearer (%)	Cloudier (%)
1	76	24
2	75	25
3	75	25
4	75	25
5	76	24
6	75	25
7	75	25
8	76	24
9	76	24
10	77	23
11	77	23
12	77	23
13	77	23
14	77	23
15	77	23
16	78	22
17	78	22
18	77	23
19	76	24
20	77	23
21	76	24
22	75	25
23	74	26
24	74	26
25	73	27
26	72	28
27	71	29
28	71	29
29	70	30
30	70	30

	Rain chance (%)
1	52
2	52
3	52
4	52
5	52
6	52
7	52
8	51
9	51
10	51
11	50
12	50
13	50
14	50
15	50
16	49
17	49
18	49
19	49
20	49
21	49
22	49
23	49
24	49
25	49
26	49
27	49
28	49
29	49
30	49

	Humid (%)	Muggy (%)	Oppressive (%)
1	8	74	18
2	8	74	18
3	8	73	19
4	8	73	19
5	8	73	19
6	8	72	20
7	8	72	20
8	8	71	21
9	8	71	21
10	7	71	22
11	7	70	23
12	7	69	24
13	6	69	25
14	6	68	26
15	5	68	27
16	5	66	29
17	5	65	30
18	4	64	32
19	4	63	33
20	4	61	35
21	4	59	37
22	4	57	39
23	4	55	41
24	4	53	43
25	4	51	45
26	4	50	46
27	4	48	48
28	4	46	50
29	4	44	52
30	4	43	53

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

	Clearer (%)	Cloudier (%)
1	76	24
2	75	25
3	75	25
4	75	25
5	76	24
6	75	25
7	75	25
8	76	24
9	76	24
10	77	23
11	77	23
12	77	23
13	77	23
14	77	23
15	77	23
16	78	22
17	78	22
18	77	23
19	76	24
20	77	23
21	76	24
22	75	25
23	74	26
24	74	26
25	73	27
26	72	28
27	71	29
28	71	29
29	70	30
30	70	30

	Rain chance (%)
1	52
2	52
3	52
4	52
5	52
6	52
7	52
8	51
9	51
10	51
11	50
12	50
13	50
14	50
15	50
16	49
17	49
18	49
19	49
20	49
21	49
22	49
23	49
24	49
25	49
26	49
27	49
28	49
29	49
30	49

	Humid (%)	Muggy (%)	Oppressive (%)
1	8	74	18
2	8	74	18
3	8	73	19
4	8	73	19
5	8	73	19
6	8	72	20
7	8	72	20
8	8	71	21
9	8	71	21
10	7	71	22
11	7	70	23
12	7	69	24
13	6	69	25
14	6	68	26
15	5	68	27
16	5	66	29
17	5	65	30
18	4	64	32
19	4	63	33
20	4	61	35
21	4	59	37
22	4	57	39
23	4	55	41
24	4	53	43
25	4	51	45
26	4	50	46
27	4	48	48
28	4	46	50
29	4	44	52
30	4	43	53

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

	Clearer (%)	Cloudier (%)
1	76	24
2	75	25
3	75	25
4	75	25
5	76	24
6	75	25
7	75	25
8	76	24
9	76	24
10	77	23
11	77	23
12	77	23
13	77	23
14	77	23
15	77	23
16	78	22
17	78	22
18	77	23
19	76	24
20	77	23
21	76	24
22	75	25
23	74	26
24	74	26
25	73	27
26	72	28
27	71	29
28	71	29
29	70	30
30	70	30

	Rain chance (%)
1	52
2	52
3	52
4	52
5	52
6	52
7	52
8	51
9	51
10	51
11	50
12	50
13	50
14	50
15	50
16	49
17	49
18	49
19	49
20	49
21	49
22	49
23	49
24	49
25	49
26	49
27	49
28	49
29	49
30	49

	Humid (%)	Muggy (%)	Oppressive (%)
1	8	74	18
2	8	74	18
3	8	73	19
4	8	73	19
5	8	73	19
6	8	72	20
7	8	72	20
8	8	71	21
9	8	71	21
10	7	71	22
11	7	70	23
12	7	69	24
13	6	69	25
14	6	68	26
15	5	68	27
16	5	66	29
17	5	65	30
18	4	64	32
19	4	63	33
20	4	61	35
21	4	59	37
22	4	57	39
23	4	55	41
24	4	53	43
25	4	51	45
26	4	50	46
27	4	48	48
28	4	46	50
29	4	44	52
30	4	43	53