Ribeirão da Ilha weather in September

In September, Ribeirão da Ilha sees average daytime highs of 20°C and overnight lows near 17°C, with 135 mm of rain across 12.2 wet days and about 11.8 hours of daylight. It is the 9th-warmest and 3rd-wettest month of the year here.

Day-to-day highs hold fairly steady near 20°C through the month. The sky is clear or mostly clear about 22% of the time in September, and the air most often feels humid.

Daylight stretches from about 11 h 24 min at the start of September to 12 h 12 min by month's end. Set against the rest of the year, September is Ribeirão da Ilha's 11th-clearest and 3rd-windiest month. For the whole year in context, see Ribeirão da Ilha's year-round climate.

Daytime high
20°
9th warmest
Overnight low
17°
4th coldest
Rainfall
135 mm
12.2 wet days
Daylight
11 h 48 min
7:13 AM – 7:04 PM
Cloud cover
68%
11th clearest
Wind
15 km/h
3rd windiest
Solar energy
3.93 kWh/m²
Travel score
5.8
out of 10

Ribeirão da Ilha is city district of Florianópolis, 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 20°C through the month.

A typical September day in Ribeirão da Ilha reaches about 20°C in the afternoon and slips back to 17°C overnight — a 3°C spread between the day's warmth and the night's chill. On most days the high lands between 17°C and 23°C. Set against its neighbours, September runs about 1°C warmer than August and about 2°C cooler than October.

10°15°20°25°151015202530
Avg high (°C)Avg low (°C)
12016
22016
32016
42016
52016
62016
72016
82016
92017
102017
112017
122017
132017
142017
152017
162017
172017
182017
192017
202017
212017
222017
232017
242017
252017
262017
272017
282017
292017
302017

Ribeirão da Ilha weather by month

How September compares with the rest of the year at a glance. September is the 9th-warmest and 3rd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan26° / 23°17518.613.65.3
Feb27° / 23°15217135.2
Mar26° / 23°12616.812.25.7
Apr24° / 21°8811.111.46.8
May22° / 18°11710.410.66.6
Jun20° / 16°979.110.36.4
Jul19° / 15°858.910.46.3
Aug19° / 15°888.9116.4
Sep20° / 17°13512.211.85.8
Oct21° / 19°12813.412.75.8
Nov23° / 20°12513.513.46.2
Dec25° / 22°12614.313.76.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 22% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 14% of September, with mostly cloudy or overcast conditions the remaining 64%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14654
24654
34555
44357
54357
64159
74060
83862
93862
103862
113763
123565
133565
143565
153565
163466
173367
183367
193466
203565
213466
223466
233466
243367
253367
263268
273268
283268
293070
303070

Chance of precipitation in September

Any precipitation

Ribeirão da Ilha gets around 135 mm of rain over 12.2 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 40% and peaks near 45% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%151015202530
Rain chance (%)
130
231
332
433
533
634
735
836
937
1038
1139
1240
1340
1441
1542
1642
1743
1843
1943
2044
2144
2245
2345
2445
2545
2645
2745
2845
2945
3045

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 42% of days. Sticky, muggy-or-worse air turns up on roughly 12% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
12526427
22426427
32426437
42426438
52426438
62425438
72425439
82424439
92424439
1023244310
1123234310
1223234311
1323234311
1422234312
1522234312
1622234213
1723234213
1823234114
1923234014
2023244014
2122244014
2222243914
2322254014
2421254014
2521254014
2620254015
2720254015
2819254015
2919254016
3018254016

Wind in September

Winds average 15 km/h in September.

Across September, daily wind ranges from about 15 km/h on the calmest days to 15 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202530
Wind speed (km/h)Feels
115light breeze
215light breeze
315light breeze
415light breeze
515light breeze
615light breeze
715light breeze
815light breeze
915light breeze
1015light breeze
1115light breeze
1215light breeze
1315light breeze
1415light breeze
1515light breeze
1615light breeze
1715light breeze
1815light breeze
1915light breeze
2015light breeze
2115light breeze
2215light breeze
2315light breeze
2415light breeze
2515light breeze
2615light breeze
2715light breeze
2815light breeze
2915light breeze
3015light breeze

Sunrise & sunset in September

DaylightNight

Daylight runs from about 11 h 24 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 48 minutes over September. Sunrise moves from 7:31 AM to 6:56 AM, and sunset from 6:56 PM to 7:10 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
111.47:316:56
211.47:306:57
311.57:296:57
411.57:286:58
511.57:276:58
611.67:256:59
711.67:246:59
811.67:237:00
911.67:227:00
1011.77:217:01
1111.77:197:01
1211.77:187:02
1311.87:177:02
1411.87:167:03
1511.87:157:03
1611.87:137:04
1711.97:127:04
1811.97:117:05
1911.97:107:05
2012.07:087:05
2112.07:077:06
2212.07:067:06
2312.07:057:07
2412.17:047:07
2512.17:027:08
2612.17:017:08
2712.17:007:09
2812.26:597:09
2912.26:587:10
3012.26:567:10

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 3.93 kWh/m².

For context, solar energy here swings from a low near 2.65 kWh/m² to a high of 5.95 kWh/m² in December across the year — September's 3.93 kWh/m² falls in the middle.

012345151015202530
Solar energy (kWh/m²)Level
13.8Moderate
23.9Moderate
33.9Moderate
43.9Moderate
53.9Moderate
63.9Moderate
73.9Moderate
83.9Moderate
93.9Moderate
103.9Moderate
113.9Moderate
123.9Moderate
133.9Moderate
143.9Moderate
153.9Moderate
163.9Moderate
173.9Moderate
183.9Moderate
194.0Moderate
204.0Moderate
214.0Moderate
224.0Moderate
234.0Moderate
244.0Bright
254.0Bright
264.0Bright
274.0Bright
284.0Bright
294.0Bright
304.1Bright
Planning a trip in September

Is September a good time to visit Ribeirão da Ilha?

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

5.8
Sightseeing
8th-best month of the year
3.0
Beach & pool
10th-best month of the year

September is a reasonable time to visit Ribeirão da Ilha for sightseeing.

What to pack for Ribeirão da Ilha in September

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

In September, Ribeirão da Ilha sees daytime highs around 20°C and nights near 17°C. Worth packing: rain gear. About 12 days see rain.

rain gear

Sea temperature near Ribeirão da Ilha in September

The nearest coast averages about 19°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 18 km away) is warmest in February at about 26°C and coldest in August near 18°C.

It's comfortable for a long swim from Oct 8 to Jun 8 — about 8 months when the water holds above 20°C.

15°20°25°JanFebMarAprMayJunJulAugSepOctNovDeccoolrefreshingwarmcomfortable to swimcomfortable to swim
Sea temperature (°C)Comfort
Jan26Warm
Feb26Warm
Mar25Warm
Apr24Refreshing
May22Refreshing
Jun20Cool
Jul18Cool
Aug18Cool
Sep19Cool
Oct21Refreshing
Nov22Refreshing
Dec24Warm

UV index in Ribeirão da Ilha in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 8 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Ribeirão da Ilha peaks around January 19 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 11 at about 4 (moderate).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highHighModerateHighVery highExtremeJan 19UV 14Jul 11UV 4
UV index (midday)Level
Jan14Extreme
Feb13Extreme
Mar11Extreme
Apr8Very high
May5High
Jun5Moderate
Jul4Moderate
Aug6High
Sep8Very high
Oct9Very high
Nov12Extreme
Dec12Extreme
Location & terrain

Where is Ribeirão da Ilha?

Ribeirão da Ilha sits at 27.7°S, 48.5°W, 2 m above sea level, in Brazil. The nearest listed city is Freguesia do Ribeirao da Ilha, 4.0 km away.

Topography around Ribeirão da Ilha

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

Within 3 km, the terrain around Ribeirão da Ilha has significant variations in elevation — a maximum elevation change of 529 m around an average of 57 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 1,038 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,783 m.

The land around Ribeirão da Ilha is covered by trees (52%) and grassland (22%) within 3 km, water (59%) and trees (24%) within 16 km, and trees (48%) and water (41%) within 80 km.

3 km
529 m
16 km
1,038 m
80 km
1,783 m
treesgrasslandcroplandartificial surfaceswaterwetlandmangroves
September weather nearby: Freguesia do Ribeirao da Ilha 4.0 km · Pantanal 10 km · Florianopolis 12 km · Trindade 13 km · São José 13 km · Campinas 14 km · Palhoça 15 km · Santo Amaro da Imperatriz 24 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 Ribeirão da Ilha (-27.6993°, -48.5322°, elevation 2 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).