São Francisco de Itabapoana weather in September

In September, São Francisco de Itabapoana sees average daytime highs of 25°C and overnight lows near 20°C, with 56 mm of rain across 8.8 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 25°C through the month. The sky is clear or mostly clear about 47% of the time in September, and the air most often feels muggy.

Daylight stretches from about 11 h 36 min at the start of September to 12 h 12 min by month's end. Set against the rest of the year, September is São Francisco de Itabapoana's 5th-clearest and 1st-windiest month. For the whole year in context, see São Francisco de Itabapoana's year-round climate.

Daytime high
25°
9th warmest
Overnight low
20°
4th coldest
Rainfall
56 mm
8.8 wet days
Daylight
11 h 54 min
6:42 AM – 6:35 PM
Cloud cover
48%
5th clearest
Wind
17 km/h
1st windiest
Solar energy
5.03 kWh/m²
Travel score
7.3
out of 10

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 São Francisco de Itabapoana reaches about 25°C in the afternoon and slips back to 20°C overnight — a 4°C spread between the day's warmth and the night's chill. On most days the high lands between 22°C and 27°C. Set against its neighbours, September runs on par with August and on par with October.

15°20°25°30°151015202530
Avg high (°C)Avg low (°C)
12420
22520
32520
42520
52520
62520
72520
82520
92520
102520
112520
122520
132520
142520
152520
162520
172520
182520
192520
202520
212520
222520
232520
242521
252521
262521
272521
282521
292521
302521

São Francisco de Itabapoana 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.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan27° / 24°11010.813.26.2
Feb28° / 24°71812.76.6
Mar28° / 24°11713.612.26.0
Apr27° / 23°7912.111.56.4
May25° / 21°5910.1117.0
Jun25° / 20°326.810.77.8
Jul24° / 19°357.610.87.8
Aug24° / 19°336.811.37.9
Sep25° / 20°568.811.97.3
Oct25° / 21°8510.512.56.7
Nov26° / 22°16315.4135.7
Dec27° / 23°17215.613.35.6

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 47% 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 39%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
17228
27129
37129
47129
57129
67030
77030
87030
96931
106733
116634
126634
136535
146436
156238
166139
176040
186040
195941
205743
215545
225446
235347
245248
255248
265050
274951
284852
294852
304753

Chance of precipitation in September

Any precipitation

São Francisco de Itabapoana gets around 56 mm of rain over 8.8 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 29% and peaks near 34% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%40%151015202530
Rain chance (%)
124
225
325
425
525
626
726
826
927
1027
1128
1228
1328
1429
1529
1629
1730
1830
1931
2031
2132
2232
2333
2433
2533
2633
2734
2834
2934
3034

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 56% of days. Sticky, muggy-or-worse air turns up on roughly 62% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
121130561
221130561
321130561
421129571
521029572
621029572
721029572
821029572
92929582
102929573
112929573
121928593
131828594
141828594
151828585
161728595
171727605
181727596
191727596
201727587
211727578
221727578
232726569
2427265510
2527265411
2627265312
2727255313
2827255214
2927245215
3027245116

Wind in September

Winds average 17 km/h in September, the windiest month of the year.

Across September, daily wind ranges from about 17 km/h on the calmest days to 17 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202530
Wind speed (km/h)Feels
117light breeze
217light breeze
317light breeze
417light breeze
517light breeze
617light breeze
717light breeze
817light breeze
917light breeze
1017light breeze
1117light breeze
1217light breeze
1317light breeze
1417light breeze
1517light breeze
1617light breeze
1717light breeze
1817light breeze
1917light breeze
2017light breeze
2117light breeze
2217light breeze
2317light breeze
2417light breeze
2517light breeze
2617light breeze
2717light breeze
2817light breeze
2917light breeze
3017light breeze

Sunrise & sunset in September

DaylightNight

Daylight runs from about 11 h 36 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 36 minutes over September. Sunrise moves from 6:56 AM to 6:28 AM, and sunset from 6:31 PM to 6:38 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
111.66:566:31
211.66:556:31
311.66:556:31
411.66:546:31
511.76:536:32
611.76:526:32
711.76:516:32
811.76:506:33
911.76:496:33
1011.86:486:33
1111.86:476:33
1211.86:466:34
1311.86:456:34
1411.86:446:34
1511.96:436:34
1611.96:426:35
1711.96:416:35
1811.96:406:35
1911.96:396:35
2012.06:386:36
2112.06:376:36
2212.06:366:36
2312.06:356:36
2412.06:346:37
2512.16:336:37
2612.16:326:37
2712.16:316:37
2812.16:306:38
2912.26:296:38
3012.26:286:38

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.03 kWh/m².

For context, solar energy here swings from a low near 3.6 kWh/m² to a high of 6.48 kWh/m² in February across the year — September's 5.03 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
14.9Bright
24.9Bright
34.9Bright
44.9Bright
55.0Bright
65.0Bright
75.0Bright
85.0Bright
95.0Bright
105.0Bright
115.0Bright
125.0Bright
135.0Bright
145.0Bright
155.0Bright
165.0Bright
175.0Bright
185.0Bright
195.0Bright
205.0Bright
215.0Bright
225.0Bright
235.1Bright
245.1Bright
255.1Bright
265.1Bright
275.1Bright
285.1Bright
295.1Bright
305.2Bright
Planning a trip in September

Hazard calendar for São Francisco de Itabapoana

In seasonPeak

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

São Francisco de Itabapoana's rainy season runs October–January, 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 São Francisco de Itabapoana?

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

7.3
Sightseeing
4th-best month of the year
6.4
Beach & pool
8th-best month of the year

September is one of the better times to visit São Francisco de Itabapoana for general sightseeing. The water and warmth also suit a beach or pool day.

What to pack for São Francisco de Itabapoana in September

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

In September, São Francisco de Itabapoana sees daytime highs around 25°C and nights near 20°C. Worth packing: light clothes, rain gear and sun protection. About 9 days see rain.

light clothesrain gearsun protection

Sea temperature near São Francisco de Itabapoana in September

The nearest coast averages about 23°C in September — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea offshore is warmest in March at about 25°C and coldest in August near 23°C.

The water stays above 20°C all year — warm enough for a swim any month.

22°24°26°JanFebMarAprMayJunJulAugSepOctNovDecrefreshingwarmcomfortable to swim
Sea temperature (°C)Comfort
Jan24Warm
Feb25Warm
Mar25Warm
Apr25Warm
May24Warm
Jun23Refreshing
Jul23Refreshing
Aug23Refreshing
Sep23Refreshing
Oct23Refreshing
Nov24Refreshing
Dec24Warm

UV index in São Francisco de Itabapoana in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 10 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in São Francisco de Itabapoana peaks around February 9 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 20 at about 6 (high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highHighVery highExtremeFeb 9UV 14Jun 20UV 6
UV index (midday)Level
Jan14Extreme
Feb14Extreme
Mar12Extreme
Apr10Very high
May7High
Jun6High
Jul6High
Aug8Very high
Sep10Very high
Oct12Extreme
Nov13Extreme
Dec13Extreme
Location & terrain

Where is São Francisco de Itabapoana?

São Francisco de Itabapoana sits at 21.3°S, 41.0°W, 1 m above sea level, in Brazil. The nearest listed city is Marataizes, 32 km away.

Topography around São Francisco de Itabapoana

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of São Francisco de Itabapoana.

Within 3 km, the terrain around São Francisco de Itabapoana has only modest variations in elevation — a maximum elevation change of 23 m around an average of 4 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 86 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,346 m.

The land around São Francisco de Itabapoana is covered by water (50%) and grassland (25%) within 3 km, water (51%) and grassland (26%) within 16 km, and grassland (47%) and water (31%) within 80 km.

3 km
23 m
16 km
86 m
80 km
1,346 m
treesgrasslandcroplandartificial surfacesbare terrainwaterwetlandmangroves
September weather nearby: Marataizes 32 km · Itapemirim 35 km · São João da Barra 39 km · Mimoso do Sul 50 km · Cachoeiro de Itapemirim 53 km · Piúma 57 km · Campos dos Goytacazes 63 km · Anchieta 64 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 São Francisco de Itabapoana (-21.3019°, -40.9614°, elevation 1 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).