São Fidélis weather in September

In September, São Fidélis sees average daytime highs of 27°C and overnight lows near 17°C, with 72 mm of rain across 10.2 wet days and about 11.9 hours of daylight. It is the 8th-warmest and 8th-wettest month of the year here.

Day-to-day highs hold fairly steady near 27°C through the month. The sky is clear or mostly clear about 32% of the time in September, and the air most often feels humid.

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 Fidélis's 5th-clearest and 1st-windiest month. For the whole year in context, see São Fidélis's year-round climate.

Daytime high
27°
8th warmest
Overnight low
17°
4th coldest
Rainfall
72 mm
10.2 wet days
Daylight
11 h 54 min
6:45 AM – 6:38 PM
Cloud cover
59%
5th clearest
Wind
7 km/h
1st windiest
Solar energy
4.64 kWh/m²
Travel score
6.5
out of 10

São Fidélis 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 27°C through the month.

A typical September day in São Fidélis reaches about 27°C in the afternoon and slips back to 17°C overnight — a 10°C spread between the day's warmth and the night's chill. On most days the high lands between 21°C and 31°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°35°151015202530
Avg high (°C)Avg low (°C)
12616
22616
32616
42616
52616
62717
72717
82717
92717
102717
112717
122717
132717
142717
152717
162717
172717
182717
192717
202717
212717
222717
232717
242717
252717
262718
272718
282718
292718
302718

How September really feels in São Fidélis

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.

São Fidélis weather by month

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

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan30° / 21°22419.113.23.8
Feb31° / 21°13414.912.74.0
Mar30° / 21°18719.112.24.1
Apr28° / 20°9914.111.55.5
May26° / 17°6510.4116.6
Jun25° / 16°285.810.77.6
Jul25° / 16°265.910.87.7
Aug26° / 16°296.511.37.4
Sep27° / 17°7210.211.96.5
Oct27° / 19°11613.812.55.7
Nov28° / 20°23720134.6
Dec29° / 21°27722.313.33.9

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 32% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 13% of September, with mostly cloudy or overcast conditions the remaining 55%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
16139
26040
36040
46040
55941
65842
75743
85545
95446
105248
115149
124951
134753
144555
154456
164456
174258
184159
193961
203862
213763
223763
233664
243466
253466
263367
273367
283268
293169
303169

Chance of precipitation in September

Any precipitation

São Fidélis gets around 72 mm of rain over 10.2 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 33% and peaks near 43% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%40%50%151015202530
Rain chance (%)
121
221
322
422
523
624
725
826
927
1028
1129
1230
1331
1432
1533
1634
1735
1837
1938
2039
2140
2241
2342
2442
2543
2643
2743
2843
2943
3043

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 50% of days. Sticky, muggy-or-worse air turns up on roughly 27% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
172356140
272356140
372355150
472256150
572255160
672254170
762155180
862154190
962054200
1052054210
1151954220
1241954230
1341853241
1441753251
1531753261
1631653271
1731652281
1831651291
1941550301
2041549311
2141548321
2241547331
2341546341
2441445352
2541444352
2641443362
2741443372
2841342382
2941342382
3041341393

Wind in September

Winds average 7 km/h in September, the windiest month of the year.

Across September, daily wind ranges from about 7 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
17calm
27calm
37calm
47calm
57calm
67calm
77calm
87calm
97calm
107calm
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 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 7:00 AM to 6:31 AM, and sunset from 6:34 PM to 6:42 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
111.67:006:34
211.66:596:34
311.66:586:34
411.66:576:34
511.66:566:35
611.76:556:35
711.76:546:35
811.76:536:36
911.76:526:36
1011.86:516:36
1111.86:506:36
1211.86:496:37
1311.86:486:37
1411.86:476:37
1511.96:466:37
1611.96:456:38
1711.96:446:38
1811.96:436:38
1911.96:426:38
2012.06:416:39
2112.06:406:39
2212.06:396:39
2312.06:386:40
2412.06:376:40
2512.16:366:40
2612.16:356:40
2712.16:346:41
2812.16:336:41
2912.26:326:41
3012.26:316:42

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.64 kWh/m².

For context, solar energy here swings from a low near 3.44 kWh/m² to a high of 6.11 kWh/m² in February across the year — September's 4.64 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
14.6Bright
24.6Bright
34.6Bright
44.6Bright
54.6Bright
64.6Bright
74.7Bright
84.7Bright
94.7Bright
104.7Bright
114.7Bright
124.7Bright
134.7Bright
144.7Bright
154.7Bright
164.6Bright
174.6Bright
184.6Bright
194.6Bright
204.6Bright
214.6Bright
224.6Bright
234.6Bright
244.6Bright
254.6Bright
264.6Bright
274.7Bright
284.7Bright
294.7Bright
304.7Bright
Planning a trip in September

Hazard calendar for São Fidélis

In seasonPeak

None of São Fidélis'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 Fidélis's rainy season runs November–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 São Fidélis?

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

6.5
Sightseeing
5th-best month of the year
6.5
Beach & pool
4th-best month of the year

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

What to pack for São Fidélis in September

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

In September, São Fidélis sees daytime highs around 27°C and nights near 17°C. Worth packing: light clothes, rain gear and sun protection. About 10 days see rain.

light clothesrain gearsun protection

Sea temperature near São Fidélis in September

The nearest coast averages about 22°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 66 km away) is warmest in March at about 25°C and coldest in August near 22°C.

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

20°22°24°26°JanFebMarAprMayJunJulAugSepOctNovDecrefreshingwarmcomfortable to swim
Sea temperature (°C)Comfort
Jan24Warm
Feb25Warm
Mar25Warm
Apr25Warm
May24Refreshing
Jun23Refreshing
Jul22Refreshing
Aug22Refreshing
Sep22Refreshing
Oct22Refreshing
Nov23Refreshing
Dec24Warm

UV index in São Fidélis in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 8 (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 Fidélis peaks around February 9 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 23 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 23UV 6
UV index (midday)Level
Jan14Extreme
Feb14Extreme
Mar12Extreme
Apr9Very high
May7High
Jun6High
Jul6High
Aug8Very high
Sep8Very high
Oct12Extreme
Nov13Extreme
Dec14Extreme
Location & terrain

Where is São Fidélis?

São Fidélis sits at 21.6°S, 41.7°W, 22 m above sea level, in Brazil. The nearest listed city is Cambuci, 19 km away.

Topography around São Fidélis

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

Within 3 km, the terrain around São Fidélis has significant variations in elevation — a maximum elevation change of 325 m around an average of 77 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,301 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,716 m.

The land around São Fidélis is covered by grassland (57%) and trees (26%) within 3 km, grassland (64%) and trees (34%) within 16 km, and grassland (65%) and trees (24%) within 80 km.

3 km
325 m
16 km
1,301 m
80 km
1,716 m
treesgrasslandcroplandartificial surfaceswaterwetland
September weather nearby: Cambuci 19 km · Itaocara 34 km · Campos dos Goytacazes 45 km · Santo Antônio de Pádua 46 km · Conceição de Macabu 50 km · Itaperuna 51 km · Miracema 53 km · Bom Jesus do Itabapoana 57 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 Fidélis (-21.6461°, -41.7469°, elevation 22 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).