Riachão das Neves weather in September

In September, Riachão das Neves sees average daytime highs of 34°C and overnight lows near 21°C, with 7 mm of rain across 1.1 wet days and about 11.9 hours of daylight. It is the 2nd-warmest and 9th-wettest month of the year here.

Day-to-day highs hold fairly steady near 34°C through the month. The sky is clear or mostly clear about 65% 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 Riachão das Neves's 3rd-clearest and 1st-windiest month. For the whole year in context, see Riachão das Neves's year-round climate.

Daytime high
34°
2nd warmest
Overnight low
21°
7th coldest
Rainfall
7 mm
1.1 wet days
Daylight
11 h 54 min
5:56 AM – 5:52 PM
Cloud cover
33%
3rd clearest
Wind
9 km/h
1st windiest
Solar energy
6.6 kWh/m²
Travel score
4.2
out of 10

Riachão das Neves 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 34°C through the month.

A typical September day in Riachão das Neves reaches about 34°C in the afternoon and slips back to 21°C overnight — a 13°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
83320
93320
103320
113321
123321
133321
143321
153421
163421
173421
183421
193421
203421
213421
223421
233422
243422
253422
263422
273422
283422
293422
303422

How September really feels in Riachão das Neves

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.

Riachão das Neves weather by month

How September compares with the rest of the year at a glance. September is the 2nd-warmest and 9th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan30° / 21°16316.412.64.2
Feb30° / 21°12215.112.44.2
Mar30° / 21°15316.412.14.2
Apr30° / 21°659.411.74.9
May31° / 20°182.911.55.6
Jun30° / 19°10.111.36.3
Jul30° / 18°0011.46.4
Aug32° / 19°10.111.65.5
Sep34° / 21°71.111.94.2
Oct34° / 23°536.112.33.5
Nov31° / 22°15613.512.53.8
Dec30° / 21°15714.512.74.1

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 65% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 16% of September, with mostly cloudy or overcast conditions the remaining 19%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
18416
28416
38416
48416
58416
68317
78317
88317
98317
108317
118317
128317
138218
148218
158218
168218
178218
188119
198020
208020
218020
227921
237921
247921
257723
267723
277624
287624
297525
307525

Chance of precipitation in September

Any precipitation

Riachão das Neves gets around 7 mm of rain over 1.1 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 9% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%151015202530
Rain chance (%)
11
21
31
41
51
62
72
82
92
102
112
122
132
142
153
163
173
184
194
205
215
225
236
246
256
267
277
288
298
309

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 (%)
1564040
2564040
3554050
4544051
5544051
6534061
7534061
8534061
9524071
10524071
11524071
12504181
13504181
14494191
154841101
164741102
174541112
184442122
194342132
204142143
213942153
223843163
233643174
243444184
253244194
263145205
272945205
282845216
292746216
302646217

Wind in September

Winds average 9 km/h in September, the windiest month of the year.

Across September, daily wind ranges from about 9 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
19calm
29calm
39calm
49calm
59calm
69calm
79calm
89calm
99calm
109calm
119calm
129calm
139calm
149calm
159calm
169calm
179calm
189calm
199calm
209calm
219calm
229calm
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 6:06 AM to 5:46 AM, and sunset from 5:52 PM to 5:52 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
111.86:065:52
211.86:065:52
311.86:055:52
411.86:045:52
511.86:045:52
611.86:035:52
711.86:025:52
811.86:025:52
911.96:015:52
1011.96:005:52
1111.95:595:52
1211.95:595:52
1311.95:585:52
1411.95:575:52
1511.95:575:52
1611.95:565:52
1711.95:555:52
1812.05:545:52
1912.05:545:52
2012.05:535:52
2112.05:525:52
2212.05:525:52
2312.05:515:52
2412.05:505:52
2512.05:505:52
2612.05:495:52
2712.15:485:52
2812.15:485:52
2912.15:475:52
3012.15:465:52

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 6.6 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 6.6 kWh/m² in September across the year — September's 6.6 kWh/m² sits near the top of that range.

0246151015202530
Solar energy (kWh/m²)Level
16.4Intense
26.4Intense
36.4Intense
46.5Intense
56.5Intense
66.5Intense
76.5Intense
86.5Intense
96.6Intense
106.6Intense
116.6Intense
126.6Intense
136.6Intense
146.6Intense
156.6Intense
166.7Intense
176.7Intense
186.7Intense
196.7Intense
206.7Intense
216.7Intense
226.6Intense
236.6Intense
246.6Intense
256.6Intense
266.6Intense
276.6Intense
286.7Intense
296.7Intense
306.7Intense
Planning a trip in September

Hazard calendar for Riachão das Neves

In seasonPeak

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

Riachão das Neves'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 Riachão das Neves?

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

4.2
Sightseeing
6th-best month of the year
7.7
Beach & pool
5th-best month of the year

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

What to pack for Riachão das Neves in September

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

In September, Riachão das Neves sees daytime highs around 34°C and nights near 21°C. Pack light clothes and sun protection.

light clothessun protection

UV index in Riachão das Neves 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 Riachão das Neves peaks around February 18 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 23 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 23UV 9
UV index (midday)Level
Jan14Extreme
Feb15Extreme
Mar15Extreme
Apr12Extreme
May10Extreme
Jun9Very high
Jul9Very high
Aug10Extreme
Sep12Extreme
Oct12Extreme
Nov13Extreme
Dec13Extreme

Air quality in Riachão das Neves 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 Riachão das Neves is worst in September — around 25 µg/m³ PM2.5 (moderate), about 5.7× the cleanest month (July, 4 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodSep 2324 µg/m³Jul 154 µg/m³
PM2.5 (µg/m³)Level
Jan6Good
Feb7Good
Mar7Good
Apr6Good
May5Good
Jun5Good
Jul4Good
Aug6Good
Sep25Moderate
Oct24Moderate
Nov9Good
Dec9Good
Location & terrain

Where is Riachão das Neves?

Riachão das Neves sits at 11.7°S, 44.9°W, 503 m above sea level, in Brazil. The nearest listed city is Barreiras, 46 km away.

Topography around Riachão das Neves

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Riachão das Neves.

Within 3 km, the terrain around Riachão das Neves has only modest variations in elevation — a maximum elevation change of 192 m around an average of 533 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 357 m; within 80 km, significant variations in elevation — a maximum elevation change of 401 m.

The land around Riachão das Neves is covered by trees (35%), grassland (29%) and shrubs (24%) within 3 km, trees (49%) and shrubs (31%) within 16 km, and shrubs (41%) and trees (35%) within 80 km.

3 km
192 m
16 km
357 m
80 km
401 m
treesshrubsgrasslandcroplandartificial surfaces
September weather nearby: Barreiras 46 km · São Desidério 69 km · Formosa do Rio Preto 84 km · Santa Rita de Cássia 92 km · Luis Eduardo Magalhães 103 km · Corrente 147 km · Serra Dourada 154 km · Santana 166 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 Riachão das Neves (-11.7461°, -44.91°, elevation 503 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).