Itariri weather in September

In September, Itariri sees average daytime highs of 24°C and overnight lows near 16°C, with 128 mm of rain across 13.9 wet days and about 11.8 hours of daylight. It is the 9th-warmest and 7th-wettest month of the year here.

Day-to-day highs hold fairly steady near 24°C through the month. The sky is clear or mostly clear about 20% of the time in September, and the air most often feels humid.

Daylight stretches from about 11 h 30 min at the start of September to 12 h 12 min by month's end. Set against the rest of the year, September is Itariri's 7th-clearest and 3rd-windiest month. For the whole year in context, see Itariri's year-round climate.

Daytime high
24°
9th warmest
Overnight low
16°
4th coldest
Rainfall
128 mm
13.9 wet days
Daylight
11 h 54 min
7:07 AM – 6:59 PM
Cloud cover
72%
7th clearest
Wind
7 km/h
3rd windiest
Solar energy
4.05 kWh/m²
Travel score
6.1
out of 10

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 24°C through the month.

A typical September day in Itariri reaches about 24°C in the afternoon and slips back to 16°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 19°C and 29°C. Set against its neighbours, September runs about 1°C warmer than August and about 1°C cooler than October.

10°15°20°25°30°151015202530
Avg high (°C)Avg low (°C)
12415
22416
32416
42416
52416
62416
72416
82416
92416
102416
112416
122416
132416
142416
152416
162416
172416
182416
192416
202416
212416
222416
232417
242417
252417
262417
272417
282417
292417
302417

Itariri weather by month

How September compares with the rest of the year at a glance. September is the 9th-warmest and 7th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan29° / 22°30125.913.33.5
Feb29° / 22°26722.712.83.6
Mar28° / 21°23123.712.24.2
Apr26° / 19°12515.111.45.7
May24° / 16°10712.410.86.5
Jun23° / 15°809.210.56.9
Jul22° / 14°839.610.66.9
Aug23° / 15°739.511.26.9
Sep24° / 16°12813.911.86.1
Oct25° / 18°14117.512.65.4
Nov26° / 19°16618.913.25.0
Dec28° / 21°21321.813.54.4

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 20% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 10% of September, with mostly cloudy or overcast conditions the remaining 69%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14753
24555
34456
44357
54258
64060
73862
83763
93763
103466
113367
123268
133169
143169
152971
162971
172872
182872
192575
202575
212575
222377
232377
242377
252278
262179
272080
282080
291981
301981

Chance of precipitation in September

Any precipitation

Itariri gets around 128 mm of rain over 13.9 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 46% and peaks near 57% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%151015202530
Rain chance (%)
136
237
337
438
539
639
740
841
941
1041
1142
1242
1342
1443
1543
1644
1745
1846
1947
2048
2149
2250
2351
2452
2553
2654
2755
2856
2957
3057

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 48% of days. Sticky, muggy-or-worse air turns up on roughly 24% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
182753120
282752130
382751140
472751150
572750160
662750170
762749170
862749180
952749190
1052748190
1152648200
1252648210
1342548221
1442548221
1542448231
1642348231
1752348241
1852248241
1952247251
2052247251
2162147261
2262146271
2362046271
2462045281
2561945291
2661944301
2761944311
2851843321
2951843331
3051842342

Wind in September

Winds average 7 km/h in September.

Across September, daily wind ranges from about 6 km/h on the calmest days to 7 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (km/h)Feels
16calm
26calm
36calm
46calm
56calm
66calm
76calm
86calm
96calm
106calm
117calm
127calm
137calm
147calm
157calm
167calm
177calm
187calm
197calm
207calm
217calm
227calm
237calm
247calm
257calm
267calm
277calm
287calm
297calm
307calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 11 h 30 min at the start of September to 12 h 12 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 42 minutes over September. Sunrise moves from 7:23 AM to 6:52 AM, and sunset from 6:53 PM to 7:04 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
111.57:236:53
211.57:226:54
311.57:216:54
411.67:206:55
511.67:196:55
611.67:186:55
711.67:176:56
811.77:166:56
911.77:156:56
1011.77:146:57
1111.77:136:57
1211.87:126:57
1311.87:106:58
1411.87:096:58
1511.87:086:58
1611.97:076:59
1711.97:066:59
1811.97:057:00
1911.97:047:00
2012.07:037:00
2112.07:027:01
2212.07:017:01
2312.07:007:01
2412.16:587:02
2512.16:577:02
2612.16:567:02
2712.16:557:03
2812.26:547:03
2912.26:537:04
3012.26:527:04

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.05 kWh/m².

For context, solar energy here swings from a low near 2.9 kWh/m² to a high of 5.5 kWh/m² in December across the year — September's 4.05 kWh/m² falls in the middle.

012345151015202530
Solar energy (kWh/m²)Level
14.0Bright
24.0Bright
34.1Bright
44.1Bright
54.1Bright
64.1Bright
74.1Bright
84.1Bright
94.1Bright
104.1Bright
114.1Bright
124.1Bright
134.1Bright
144.1Bright
154.1Bright
164.1Bright
174.1Bright
184.1Bright
194.1Bright
204.1Bright
214.1Bright
224.1Bright
234.1Bright
244.1Bright
254.1Bright
264.1Bright
274.1Bright
284.1Bright
294.1Bright
304.2Bright
Planning a trip in September

Hazard calendar for Itariri

In seasonPeak

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

Itariri's rainy season runs October–March, 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 Itariri?

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

6.1
Sightseeing
5th-best month of the year
5.0
Beach & pool
5th-best month of the year

September is a reasonable time to visit Itariri for sightseeing.

What to pack for Itariri in September

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

In September, Itariri sees daytime highs around 24°C and nights near 16°C. Pack rain gear. Worth having: light clothes. About 14 days see rain.

rain gearlight clothes

Sea temperature near Itariri in September

The nearest coast averages about 21°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 32 km away) is warmest in February at about 27°C and coldest in August near 20°C.

It's comfortable for a long swim from Aug 19 to Aug 9 — about 11.7 months when the water holds above 20°C.

20°25°JanFebMarAprMayJunJulAugSepOctNovDeccoolrefreshingwarmtropicalcomfortable to swimcomfortable to swim
Sea temperature (°C)Comfort
Jan27Warm
Feb27Warm
Mar27Warm
Apr26Warm
May24Refreshing
Jun22Refreshing
Jul20Refreshing
Aug20Cool
Sep21Refreshing
Oct22Refreshing
Nov23Refreshing
Dec25Warm

UV index in Itariri in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 7 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Itariri peaks around January 21 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 11 at about 5 (high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highHighVery highExtremeJan 21UV 14Jul 11UV 5
UV index (midday)Level
Jan14Extreme
Feb14Extreme
Mar11Extreme
Apr8Very high
May6High
Jun5High
Jul5High
Aug7High
Sep7High
Oct10Extreme
Nov13Extreme
Dec13Extreme

Air quality in Itariri 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 Itariri is worst in July — around 33 µg/m³ PM2.5 (moderate), about 2.0× the cleanest month (January, 17 µg/m³).

Modeled monthly averages (CAMS reanalysis, 2015–2024).

010203040JanFebMarAprMayJunJulAugSepOctNovDecModerateJul 2033 µg/m³Jan 1817 µg/m³
PM2.5 (µg/m³)Level
Jan17Moderate
Feb17Moderate
Mar18Moderate
Apr20Moderate
May24Moderate
Jun30Moderate
Jul33Moderate
Aug32Moderate
Sep29Moderate
Oct21Moderate
Nov17Moderate
Dec17Moderate
Location & terrain

Where is Itariri?

Itariri sits at 24.3°S, 47.2°W, 60 m above sea level, in Brazil. The nearest listed city is Peruíbe, 18 km away.

Topography around Itariri

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

Within 3 km, the terrain around Itariri has significant variations in elevation — a maximum elevation change of 345 m around an average of 97 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,402 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,374 m.

The land around Itariri is covered by trees (84%) within 3 km, trees (96%) within 16 km, and trees (60%) and water (32%) within 80 km.

3 km
345 m
16 km
1,402 m
80 km
1,374 m
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Peruíbe 18 km · Miracatu 29 km · Itanhaém 41 km · Juquitiba 41 km · Juquiá 47 km · São Lourenço da Serra 54 km · Mongaguá 60 km · Iguape 60 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 Itariri (-24.2892°, -47.1744°, elevation 60 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. 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).