Rio Preto da Eva weather in September

In September, Rio Preto da Eva sees average daytime highs of 33°C and overnight lows near 23°C, with 96 mm of rain across 18.3 wet days and about 12 hours of daylight. It is the 1st-warmest and 10th-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 19% of the time in September, and the air most often feels oppressive.

Daylight stretches from about 11 h 54 min at the start of September to 12 hours by month's end. Set against the rest of the year, September is Rio Preto da Eva's 3rd-clearest and 5th-windiest month. For the whole year in context, see Rio Preto da Eva's year-round climate.

Daytime high
33°
1st warmest
Overnight low
23°
10th coldest
Rainfall
96 mm
18.3 wet days
Daylight
12 hours
5:54 AM – 5:53 PM
Cloud cover
66%
3rd clearest
Wind
5 km/h
5th windiest
Solar energy
5.43 kWh/m²
Travel score
2.8
out of 10

Rio Preto da Eva 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 33°C through the month.

A typical September day in Rio Preto da Eva reaches about 33°C in the afternoon and slips back to 23°C overnight — a 10°C spread between the day's warmth and the night's chill. On most days the high lands between 30°C and 36°C. Set against its neighbours, September runs on par with August and on par with October.

20°25°30°35°40°151015202530
Avg high (°C)Avg low (°C)
13323
23323
33323
43323
53323
63323
73323
83323
93323
103323
113323
123323
133323
143323
153324
163324
173324
183324
193324
203324
213324
223324
233324
243324
253324
263324
273324
283324
293324
303324

How September really feels in Rio Preto da Eva

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.

Rio Preto da Eva weather by month

How September compares with the rest of the year at a glance. September is the 1st-warmest and 10th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan30° / 23°25327.312.12.8
Feb30° / 23°2472512.12.9
Mar30° / 23°33428.9122.7
Apr30° / 23°33028.811.92.7
May30° / 23°27529.111.92.7
Jun30° / 23°14223.511.83.2
Jul31° / 22°9519.311.93.6
Aug32° / 23°8416.611.93.3
Sep33° / 23°9618.3122.8
Oct33° / 24°1322012.12.7
Nov32° / 24°16622.512.12.6
Dec31° / 23°23427.612.22.6

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 19% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 21% of September, with mostly cloudy or overcast conditions the remaining 60%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14753
24753
34555
44456
54357
64258
74258
84159
94159
104060
114060
123961
133961
143961
153961
163862
173862
183862
193862
203763
213862
223862
233862
243763
253862
263862
273961
283862
293862
303862

Chance of precipitation in September

Any precipitation

Rio Preto da Eva gets around 96 mm of rain over 18.3 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 60% and peaks near 61% on the wettest days.

0%20%40%60%151015202530
Rain chance (%)
160
260
360
460
560
660
760
860
961
1061
1161
1260
1360
1460
1560
1660
1760
1860
1960
2060
2160
2260
2360
2460
2559
2659
2759
2859
2959
3060

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the oppressive band about 76% of days. Sticky, muggy-or-worse air turns up on roughly 99% of them.

0%25%50%75%100%151015202530
Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1058114
2058114
3058114
4068014
5167815
6167815
7167815
8177715
9177715
10177616
11177616
12177616
13177517
14177517
15177517
16177517
17177517
18177517
19177517
20177418
21177418
22077518
23087418
24087418
25087418
26087517
27087517
28087517
29087517
30087616

Wind in September

Winds average 5 km/h in September.

Across September, daily wind ranges from about 5 km/h on the calmest days to 5 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (km/h)Feels
15calm
25calm
35calm
45calm
55calm
65calm
75calm
85calm
95calm
105calm
115calm
125calm
135calm
145calm
155calm
165calm
175calm
185calm
195calm
205calm
215calm
225calm
235calm
245calm
255calm
265calm
275calm
285calm
295calm
305calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 11 h 54 min at the start of September to 12 hours by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 6 minutes over September. Sunrise moves from 6:00 AM to 5:47 AM, and sunset from 5:57 PM to 5:49 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
111.96:005:57
212.06:005:57
312.05:595:56
412.05:595:56
512.05:585:56
612.05:585:56
712.05:585:55
812.05:575:55
912.05:575:55
1012.05:565:54
1112.05:565:54
1212.05:555:54
1312.05:555:54
1412.05:545:53
1512.05:545:53
1612.05:545:53
1712.05:535:52
1812.05:535:52
1912.05:525:52
2012.05:525:52
2112.05:515:51
2212.05:515:51
2312.05:505:51
2412.05:505:50
2512.05:505:50
2612.05:495:50
2712.05:495:50
2812.05:485:49
2912.05:485:49
3012.05:475:49

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.43 kWh/m² — the sunniest month for solar.

For context, solar energy here swings from a low near 3.82 kWh/m² to a high of 5.43 kWh/m² in September across the year — September's 5.43 kWh/m² sits near the top of that range.

0246151015202530
Solar energy (kWh/m²)Level
15.3Bright
25.3Bright
35.3Bright
45.3Bright
55.3Bright
65.3Bright
75.4Bright
85.4Bright
95.4Bright
105.4Bright
115.4Bright
125.4Bright
135.4Bright
145.4Bright
155.4Bright
165.4Bright
175.5Bright
185.5Bright
195.5Bright
205.5Bright
215.5Bright
225.5Bright
235.5Bright
245.5Bright
255.5Bright
265.5Bright
275.5Bright
285.5Bright
295.5Bright
305.5Bright
Planning a trip in September

Is September a good time to visit Rio Preto da Eva?

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

2.8
Sightseeing
5th-best month of the year
4.9
Beach & pool
3rd-best month of the year

September is a weaker month for outdoor sightseeing in Rio Preto da Eva.

What to pack for Rio Preto da Eva in September

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

In September, Rio Preto da Eva sees daytime highs around 33°C and nights near 23°C. Pack light clothes and rain gear. Worth having: sun protection. About 18 days see rain.

light clothesrain gearsun protection

UV index in Rio Preto da Eva in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 11 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Rio Preto da Eva peaks around March 12 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near November 13 at about 10 (very high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeExtremeMar 12UV 15Nov 13UV 10
UV index (midday)Level
Jan15Extreme
Feb15Extreme
Mar15Extreme
Apr14Extreme
May12Extreme
Jun10Extreme
Jul10Extreme
Aug11Extreme
Sep11Extreme
Oct10Extreme
Nov10Very high
Dec12Extreme

Air quality in Rio Preto da Eva 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 Rio Preto da Eva is worst in October — around 29 µg/m³ PM2.5 (moderate), about 2.5× the cleanest month (June, 12 µg/m³).

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

010203040JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodModerateOct 1129 µg/m³Jun 1412 µg/m³
PM2.5 (µg/m³)Level
Jan15Moderate
Feb16Moderate
Mar16Moderate
Apr15Moderate
May12Good
Jun12Good
Jul12Moderate
Aug20Moderate
Sep28Moderate
Oct29Moderate
Nov24Moderate
Dec18Moderate
Location & terrain

Where is Rio Preto da Eva?

Rio Preto da Eva sits at 2.7°S, 59.7°W, 39 m above sea level, in Brazil. The nearest listed city is Careiro da Várzea, 57 km away.

Topography around Rio Preto da Eva

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

Within 3 km, the terrain around Rio Preto da Eva has only modest variations in elevation — a maximum elevation change of 93 m around an average of 58 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 148 m; within 80 km, only modest variations in elevation — a maximum elevation change of 208 m.

The land around Rio Preto da Eva is covered by trees (79%) within 3 km, trees (96%) within 16 km, and trees (88%) within 80 km.

3 km
93 m
16 km
148 m
80 km
208 m
treesgrasslandartificial surfaceswaterwetland
September weather nearby: Careiro da Várzea 57 km · Manaus 57 km · Presidente Figueiredo 82 km · Iranduba 85 km · Autazes 117 km · Manaquiri 117 km · Manacapuru 122 km · Novo Airão 138 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 Rio Preto da Eva (-2.698°, -59.7017°, elevation 39 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).