São João da Boa Vista weather in September

In September, São João da Boa Vista sees average daytime highs of 27°C and overnight lows near 16°C, with 77 mm of rain across 8.7 wet days and about 11.9 hours of daylight. It is the 7th-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 52% of the time in September, and the air most often feels dry.

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 João da Boa Vista's 4th-clearest and 1st-windiest month. For the whole year in context, see São João da Boa Vista's year-round climate.

Daytime high
27°
7th warmest
Overnight low
16°
5th coldest
Rainfall
77 mm
8.7 wet days
Daylight
11 h 54 min
7:05 AM – 6:58 PM
Cloud cover
45%
4th clearest
Wind
8 km/h
1st windiest
Solar energy
5.56 kWh/m²
Travel score
6.9
out of 10

São João da Boa Vista is human 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 João da Boa Vista reaches about 27°C in the afternoon and slips back to 16°C overnight — a 12°C spread between the day's warmth and the night's chill. On most days the high lands between 23°C and 32°C. Set against its neighbours, September runs about 2°C warmer than August and on par with October.

10°15°20°25°30°35°151015202530
Avg high (°C)Avg low (°C)
12715
22715
32715
42715
52715
62715
72715
82715
92715
102716
112716
122716
132716
142716
152716
162716
172716
182716
192716
202716
212716
222716
232716
242716
252716
262716
272716
282716
292717
302717

São João da Boa Vista weather by month

How September compares with the rest of the year at a glance. September is the 7th-warmest and 8th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan28° / 19°2822413.24.2
Feb28° / 19°21120.112.84.4
Mar28° / 18°1832012.25.0
Apr27° / 17°8010.211.56.7
May24° / 14°576.4117.7
Jun24° / 13°324.210.78.3
Jul24° / 12°273.310.88.5
Aug26° / 13°263.711.28.2
Sep27° / 16°778.711.96.9
Oct28° / 18°12214.712.55.5
Nov27° / 18°19119.413.14.9
Dec28° / 19°24523.413.34.4

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 52% 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 34%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
17822
27723
37723
47624
57525
67525
77426
87327
97228
107129
117129
127030
136832
146733
156733
166535
176436
186436
196337
206139
216040
225941
235941
245842
255743
265644
275644
285545
295545
305545

Chance of precipitation in September

Any precipitation

São João da Boa Vista gets around 77 mm of rain over 8.7 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 29% and peaks near 39% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%40%50%151015202530
Rain chance (%)
119
219
320
421
521
622
723
823
924
1024
1125
1226
1326
1427
1528
1628
1729
1830
1931
2032
2133
2234
2335
2436
2536
2637
2738
2838
2939
3039

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the dry band about 48% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
1692470
2682480
3672580
4652690
5642790
66228100
76029110
85930110
95731120
105532130
115333140
125034151
135034151
144835161
154735171
164635181
174535191
184435201
194335211
204234231
214134241
224033262
233932282
243732292
253631312
263530323
273430333
283329353
293129364
303029374

Wind in September

Winds average 8 km/h in September, the windiest month of the year.

Across September, daily wind ranges from about 8 km/h on the calmest days to 9 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
18calm
28calm
38calm
48calm
58calm
68calm
78calm
88calm
98calm
108calm
118calm
128calm
139calm
149calm
159calm
169calm
179calm
189calm
199calm
209calm
219calm
228calm
238calm
248calm
258calm
268calm
278calm
288calm
298calm
308calm

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 7:20 AM to 6:51 AM, and sunset from 6:54 PM to 7:02 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
111.67:206:54
211.67:196:54
311.67:186:54
411.67:176:54
511.67:166:55
611.77:156:55
711.77:146:55
811.77:136:56
911.77:126:56
1011.77:116:56
1111.87:106:56
1211.87:096:57
1311.87:086:57
1411.87:076:57
1511.97:066:57
1611.97:056:58
1711.97:046:58
1811.97:036:58
1911.97:026:59
2012.07:016:59
2112.07:006:59
2212.06:596:59
2312.06:587:00
2412.06:577:00
2512.16:567:00
2612.16:557:01
2712.16:547:01
2812.16:537:01
2912.26:527:02
3012.26:517:02

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.56 kWh/m².

For context, solar energy here swings from a low near 3.85 kWh/m² to a high of 5.91 kWh/m² in November across the year — September's 5.56 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.4Bright
25.4Bright
35.4Bright
45.5Bright
55.5Bright
65.5Bright
75.5Bright
85.5Bright
95.5Bright
105.5Bright
115.5Bright
125.5Bright
135.5Bright
145.6Bright
155.6Bright
165.6Bright
175.6Bright
185.6Bright
195.6Bright
205.6Bright
215.6Bright
225.6Bright
235.6Bright
245.6Bright
255.6Bright
265.6Bright
275.7Bright
285.7Bright
295.7Bright
305.7Bright
Planning a trip in September

Hazard calendar for São João da Boa Vista

In seasonPeak

None of São João da Boa Vista'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 João da Boa Vista's monsoon runs November–March, when most of the year's rain falls.

Monsoon
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is September a good time to visit São João da Boa Vista?

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

6.9
Sightseeing
5th-best month of the year
7.1
Beach & pool
2nd-best month of the year

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

What to pack for São João da Boa Vista in September

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

In September, São João da Boa Vista sees daytime highs around 27°C and nights near 16°C. Pack light clothes. Worth having: rain gear and sun protection. About 9 days see rain.

light clothesrain gearsun protection

UV index in São João da Boa Vista 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 João da Boa Vista peaks around January 21 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 10 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 highExtremeJan 21UV 15Jul 10UV 6
UV index (midday)Level
Jan15Extreme
Feb15Extreme
Mar13Extreme
Apr10Very high
May7Very high
Jun6High
Jul6High
Aug8Very high
Sep8Very high
Oct12Extreme
Nov14Extreme
Dec14Extreme

Air quality in São João da Boa Vista 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 São João da Boa Vista is worst in September — around 24 µg/m³ PM2.5 (moderate), about 2.7× the cleanest month (November, 9 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodSep 1522 µg/m³Nov 239 µg/m³
PM2.5 (µg/m³)Level
Jan9Good
Feb10Good
Mar10Good
Apr11Good
May11Good
Jun11Good
Jul11Good
Aug15Moderate
Sep24Moderate
Oct13Moderate
Nov9Good
Dec9Good
Location & terrain

Where is São João da Boa Vista?

São João da Boa Vista sits at 22.0°S, 46.8°W, 774 m above sea level, in Brazil. The nearest listed city is Vargem Grande do Sul, 18 km away.

Topography around São João da Boa Vista

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of São João da Boa Vista.

Within 3 km, the terrain around São João da Boa Vista has only modest variations in elevation — a maximum elevation change of 119 m around an average of 766 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 1,001 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,260 m.

The land around São João da Boa Vista is covered by artificial surfaces (40%), grassland (27%) and trees (24%) within 3 km, trees (37%), grassland (33%) and cropland (26%) within 16 km, and trees (36%), grassland (32%) and cropland (29%) within 80 km.

3 km
119 m
16 km
1,001 m
80 km
1,260 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Vargem Grande do Sul 18 km · Aguaí 21 km · Espírito Santo do Pinhal 26 km · Andradas 26 km · Poços de Caldas 32 km · Casa Branca 37 km · Jacutinga 40 km · São José do Rio Pardo 43 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 João da Boa Vista (-21.9692°, -46.7981°, elevation 774 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. 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).