Formosa do Rio Preto weather in September

In September, Formosa do Rio Preto sees average daytime highs of 33°C and overnight lows near 21°C, with 6 mm of rain across 1 wet days and about 11.9 hours of daylight. It is the 1st-warmest and 9th-wettest month of the year here.

Day-to-day highs hold fairly steady near 33°C through the month. The sky is clear or mostly clear about 67% of the time in September, and the air most often feels dry.

Daylight stretches from about 11 h 48 min at the start of September to 12 h 06 min by month's end. Set against the rest of the year, September is Formosa do Rio Preto's 3rd-clearest and 2nd-windiest month. For the whole year in context, see Formosa do Rio Preto's year-round climate.

Daytime high
33°
1st warmest
Overnight low
21°
9th coldest
Rainfall
6 mm
1 wet days
Daylight
11 h 54 min
5:57 AM – 5:53 PM
Cloud cover
33%
3rd clearest
Wind
10 km/h
2nd windiest
Solar energy
6.61 kWh/m²
Travel score
4.2
out of 10

Formosa do Rio Preto 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 33°C through the month.

A typical September day in Formosa do Rio Preto reaches about 33°C in the afternoon and slips back to 21°C overnight — a 12°C spread between the day's warmth and the night's chill. On most days the high lands between 31°C and 36°C. Set against its neighbours, September runs about 2°C warmer than August and on par with October.

15°20°25°30°35°40°151015202530
Avg high (°C)Avg low (°C)
13320
23320
33320
43320
53320
63320
73320
83321
93321
103321
113321
123321
133321
143321
153421
163421
173421
183421
193421
203421
213421
223422
233422
243422
253422
263422
273422
283422
293422
303422

How September really feels in Formosa do Rio Preto

Once humidity and wind are folded in, September averages 30 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
30
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

The story in September is heat — humidity pushes the afternoon "feels like" well above the raw temperature.

Formosa do Rio Preto weather by month

How September compares with the rest of the year at a glance. September is the 1st-warmest and 9th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan30° / 21°1681712.64.2
Feb30° / 21°13416.212.44.2
Mar30° / 21°15016.412.14.3
Apr30° / 21°729.811.85.0
May30° / 20°202.811.55.7
Jun30° / 19°00.111.46.4
Jul30° / 19°00.111.46.5
Aug32° / 19°00.111.65.6
Sep33° / 21°6111.94.2
Oct33° / 22°555.912.23.6
Nov31° / 22°13912.912.53.9
Dec30° / 21°13814.512.64.2

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 67% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 15% of September, with mostly cloudy or overcast conditions the remaining 18%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
18515
28515
38515
48515
58515
68515
78416
88416
98416
108515
118515
128515
138416
148416
158416
168317
178317
188218
198218
208218
218020
228020
237921
247822
257822
267723
277624
287624
297525
307426

Chance of precipitation in September

Any precipitation

Formosa do Rio Preto gets around 6 mm of rain over 1 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 4% and peaks near 7% on the wettest days.

0%10%20%30%151015202530
Rain chance (%)
11
21
31
41
52
62
72
82
92
102
112
123
133
143
153
163
174
184
194
205
215
225
235
245
255
266
276
286
296
307

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 44% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
1534151
2524161
3534061
4534061
5524071
6524071
7524071
8524071
9524071
10524071
11504082
12504082
13504182
14494182
15484192
164741102
174641103
184541113
194441123
204241134
214141144
223942155
233742165
243642175
253443185
263343196
273143196
283043207
292944207
302844208

Wind in September

Winds average 10 km/h in September.

Across September, daily wind ranges from about 9 km/h on the calmest days to 10 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
110calm
210calm
310calm
410calm
510calm
610calm
710calm
810calm
910calm
1010calm
1110calm
1210calm
1310calm
1410calm
1510calm
1610calm
1710calm
1810calm
1910calm
2010calm
2110calm
2210calm
239calm
249calm
259calm
269calm
279calm
289calm
299calm
309calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 11 h 48 min at the start of September to 12 h 06 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 18 minutes over September. Sunrise moves from 6:07 AM to 5:47 AM, and sunset from 5:54 PM to 5:53 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
111.86:075:54
211.86:065:54
311.86:065:54
411.86:055:54
511.86:045:54
611.86:045:54
711.86:035:54
811.96:025:54
911.96:025:54
1011.96:015:54
1111.96:005:54
1211.96:005:54
1311.95:595:53
1411.95:585:53
1511.95:585:53
1611.95:575:53
1712.05:565:53
1812.05:565:53
1912.05:555:53
2012.05:545:53
2112.05:535:53
2212.05:535:53
2312.05:525:53
2412.05:515:53
2512.05:515:53
2612.05:505:53
2712.15:495:53
2812.15:495:53
2912.15:485:53
3012.15:475:53

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 6.61 kWh/m² — the sunniest month for solar.

For context, solar energy here swings from a low near 5.02 kWh/m² to a high of 6.61 kWh/m² in September across the year — September's 6.61 kWh/m² sits near the top of that range.

0246151015202530
Solar energy (kWh/m²)Level
16.4Intense
26.5Intense
36.5Intense
46.5Intense
56.5Intense
66.5Intense
76.5Intense
86.6Intense
96.6Intense
106.6Intense
116.6Intense
126.6Intense
136.7Intense
146.7Intense
156.7Intense
166.7Intense
176.7Intense
186.7Intense
196.7Intense
206.7Intense
216.7Intense
226.6Intense
236.6Intense
246.6Intense
256.6Intense
266.6Intense
276.6Intense
286.6Intense
296.6Intense
306.6Intense
Planning a trip in September

Hazard calendar for Formosa do Rio Preto

In seasonPeak

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

Formosa do Rio Preto'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 Formosa do Rio Preto?

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

4.2
Sightseeing
7th-best month of the year
7.8
Beach & pool
5th-best month of the year

September is a reasonable time to visit Formosa do Rio Preto for sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Formosa do Rio Preto in September

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

In September, Formosa do Rio Preto sees daytime highs around 33°C and nights near 21°C. Pack light clothes and sun protection.

light clothessun protection

UV index in Formosa do Rio Preto in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 12 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Formosa do Rio Preto peaks around February 18 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 22 at about 9 (very high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highExtremeFeb 18UV 15Jun 22UV 9
UV index (midday)Level
Jan14Extreme
Feb15Extreme
Mar15Extreme
Apr13Extreme
May10Extreme
Jun9Very high
Jul9Very high
Aug11Extreme
Sep12Extreme
Oct12Extreme
Nov13Extreme
Dec13Extreme

Air quality in Formosa do Rio Preto 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 Formosa do Rio Preto is worst in October — around 24 µg/m³ PM2.5 (moderate), about 6.2× the cleanest month (July, 4 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodOct 1224 µg/m³Jul 124 µg/m³
PM2.5 (µg/m³)Level
Jan7Good
Feb7Good
Mar7Good
Apr6Good
May5Good
Jun4Good
Jul4Good
Aug5Good
Sep21Moderate
Oct24Moderate
Nov10Good
Dec9Good
Location & terrain

Where is Formosa do Rio Preto?

Formosa do Rio Preto sits at 11.0°S, 45.2°W, 495 m above sea level, in Brazil. The nearest listed city is Corrente, 67 km away.

Topography around Formosa do Rio Preto

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Formosa do Rio Preto.

Within 3 km, the terrain around Formosa do Rio Preto has only modest variations in elevation — a maximum elevation change of 92 m around an average of 503 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 285 m; within 80 km, significant variations in elevation — a maximum elevation change of 473 m.

The land around Formosa do Rio Preto is covered by trees (42%) and grassland (28%) within 3 km, trees (66%) within 16 km, and trees (37%) and shrubs (35%) within 80 km.

3 km
92 m
16 km
285 m
80 km
473 m
treesshrubsgrasslandcroplandartificial surfaceswater
September weather nearby: Corrente 67 km · Santa Rita de Cássia 74 km · Riachão das Neves 84 km · Barreiras 125 km · Luis Eduardo Magalhães 133 km · São Desidério 148 km · Buritirama 175 km · Dianópolis 189 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 Formosa do Rio Preto (-11.0483°, -45.1931°, elevation 495 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).