Itanhém weather in September

In September, Itanhém sees average daytime highs of 28°C and overnight lows near 18°C, with 30 mm of rain across 6.7 wet days and about 11.9 hours of daylight. It is the 8th-warmest and 11th-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 31% of the time in September, and the air most often feels humid.

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 Itanhém's 2nd-clearest and 2nd-windiest month. For the whole year in context, see Itanhém's year-round climate.

Daytime high
28°
8th warmest
Overnight low
18°
4th coldest
Rainfall
30 mm
6.7 wet days
Daylight
11 h 54 min
5:39 AM – 5:33 PM
Cloud cover
55%
2nd clearest
Wind
11 km/h
2nd windiest
Solar energy
4.93 kWh/m²
Travel score
6.3
out of 10

Itanhém is settlement in Brazil.

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

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 Itanhém reaches about 28°C in the afternoon and slips back to 18°C overnight — a 11°C spread between the day's warmth and the night's chill. On most days the high lands between 24°C and 32°C. Set against its neighbours, September runs about 2°C warmer than August and about 1°C cooler than October.

10°15°20°25°30°35°151015202530
Avg high (°C)Avg low (°C)
12817
22817
32817
42817
52817
62817
72817
82817
92817
102817
112818
122818
132818
142818
152818
162918
172918
182918
192918
202918
212918
222918
232918
242918
252919
262919
272919
282919
292919
302919

How September really feels in Itanhém

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
0
heat index over the day's high
Days feeling ≤ C
0
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.

Itanhém weather by month

How September compares with the rest of the year at a glance. September is the 8th-warmest and 11th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan31° / 21°8111.512.94.1
Feb32° / 22°599.312.64.0
Mar31° / 21°11115.412.13.9
Apr30° / 20°7313.811.64.7
May28° / 19°4010.111.26.1
Jun27° / 17°308.9116.7
Jul26° / 17°319.411.16.8
Aug27° / 16°257.511.46.9
Sep28° / 18°306.711.96.3
Oct29° / 19°779.812.45.2
Nov29° / 20°13914.712.84.5
Dec31° / 21°13313.9134.2

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 31% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 25% of September, with mostly cloudy or overcast conditions the remaining 45%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15941
25941
35941
45842
55842
65842
75842
85842
95842
105743
115743
125743
135842
145842
155743
165743
175644
185743
195644
205545
215545
225446
235347
245248
255149
265149
274951
284951
294852
304852

Chance of precipitation in September

Any precipitation

Itanhém gets around 30 mm of rain over 6.7 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 22% and peaks near 26% on the wettest days.

0%10%20%30%40%151015202530
Rain chance (%)
121
221
321
421
521
621
721
821
921
1021
1121
1221
1321
1420
1521
1621
1721
1821
1921
2022
2122
2223
2323
2423
2524
2624
2725
2825
2926
3026

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the humid band about 56% of days. Sticky, muggy-or-worse air turns up on roughly 29% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
121763180
221763180
321762190
421762190
521762190
621663190
721662200
831661200
931561210
1031560220
1121462220
1221461230
1321360250
1421260260
1521259270
1621159280
1721157300
1821057310
1921056320
2021055330
212954350
222953360
232952370
242951380
252950400
262849410
272847420
282846440
292845450
302744461

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.

051015151015202530
Wind speed (km/h)Feels
110calm
210calm
310calm
410calm
510calm
610calm
710calm
810calm
910calm
1010calm
1111calm
1211calm
1311calm
1411calm
1511calm
1611calm
1711calm
1811calm
1911calm
2011calm
2111calm
2211calm
2311calm
2411calm
2511calm
2611calm
2711calm
2811calm
2911calm
3011calm

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 5:51 AM to 5:27 AM, and sunset from 5:31 PM to 5:35 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
111.75:515:31
211.75:505:31
311.75:505:31
411.75:495:31
511.75:485:31
611.75:475:32
711.85:465:32
811.85:455:32
911.85:455:32
1011.85:445:32
1111.85:435:32
1211.85:425:32
1311.95:415:32
1411.95:405:33
1511.95:395:33
1611.95:395:33
1711.95:385:33
1811.95:375:33
1912.05:365:33
2012.05:355:33
2112.05:345:33
2212.05:335:34
2312.05:325:34
2412.05:325:34
2512.15:315:34
2612.15:305:34
2712.15:295:34
2812.15:285:34
2912.15:275:35
3012.15:275:35

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.93 kWh/m².

For context, solar energy here swings from a low near 3.45 kWh/m² to a high of 6.26 kWh/m² in January across the year — September's 4.93 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
14.6Bright
24.7Bright
34.7Bright
44.7Bright
54.7Bright
64.8Bright
74.8Bright
84.8Bright
94.8Bright
104.9Bright
114.9Bright
124.9Bright
134.9Bright
145.0Bright
155.0Bright
165.0Bright
175.0Bright
185.0Bright
195.0Bright
205.0Bright
215.0Bright
225.0Bright
235.0Bright
245.0Bright
255.0Bright
265.1Bright
275.1Bright
285.1Bright
295.1Bright
305.1Bright
Planning a trip in September

Hazard calendar for Itanhém

In seasonPeak

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

Itanhém's rainy season runs March–April, 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 Itanhém?

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

6.3
Sightseeing
4th-best month of the year
7.4
Beach & pool
1st-best month of the year

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

What to pack for Itanhém in September

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

In September, Itanhém sees daytime highs around 28°C and nights near 18°C. Pack light clothes. Worth having: sun protection. About 7 days see rain.

light clothessun protection

UV index in Itanhém 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 Itanhém peaks around February 15 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 21 at about 7 (very high).

The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highExtremeFeb 15UV 15Jun 21UV 7
UV index (midday)Level
Jan14Extreme
Feb15Extreme
Mar14Extreme
Apr11Extreme
May8Very high
Jun7Very high
Jul8Very high
Aug9Very high
Sep11Extreme
Oct12Extreme
Nov14Extreme
Dec13Extreme
Location & terrain

Where is Itanhém?

Itanhém sits at 17.2°S, 40.3°W, 189 m above sea level, in Brazil. The nearest listed city is Medeiros Neto, 26 km away.

Topography around Itanhém

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

Within 3 km, the terrain around Itanhém has only modest variations in elevation — a maximum elevation change of 201 m around an average of 212 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 623 m; within 80 km, large variations in elevation — a maximum elevation change of 1,163 m.

The land around Itanhém is covered by grassland (90%) within 3 km, grassland (85%) within 16 km, and grassland (75%) and trees (24%) within 80 km.

3 km
201 m
16 km
623 m
80 km
1,163 m
treesgrasslandcroplandartificial surfaces
September weather nearby: Medeiros Neto 26 km · Águas Formosas 65 km · Teixeira de Freitas 75 km · Nanuque 75 km · Carlos Chagas 76 km · Itamaraju 86 km · Guaratinga 87 km · Posto da Mata 94 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
Roman Catholic 57%Evangelical 27%none 9%other 4%

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 Itanhém (-17.1664°, -40.33°, elevation 189 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. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).