Balsas weather in September

In September, Balsas sees average daytime highs of 35°C and overnight lows near 24°C, with 9 mm of rain across 1.8 wet days and about 12 hours of daylight. It is the 1st-warmest and 9th-wettest month of the year here.

Day-to-day highs hold fairly steady near 35°C through the month. The sky is clear or mostly clear about 66% of the time in September, and the air most often feels comfortable.

Daylight stretches from about 11 h 54 min at the start of September to 12 h 06 min by month's end. Set against the rest of the year, September is Balsas's 3rd-clearest and 4th-windiest month. For the whole year in context, see Balsas's year-round climate.

Daytime high
35°
1st warmest
Overnight low
24°
11th coldest
Rainfall
9 mm
1.8 wet days
Daylight
12 hours
6:00 AM – 5:57 PM
Cloud cover
34%
3rd clearest
Wind
9 km/h
4th windiest
Solar energy
6.61 kWh/m²
Travel score
2.9
out of 10

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 35°C through the month.

A typical September day in Balsas reaches about 35°C in the afternoon and slips back to 24°C overnight — a 12°C spread between the day's warmth and the night's chill. On most days the high lands between 33°C and 37°C. Set against its neighbours, September runs about 1°C warmer than August and about 1°C warmer than October.

20°25°30°35°40°151015202530
Avg high (°C)Avg low (°C)
13523
23523
33523
43523
53524
63524
73524
83524
93524
103624
113624
123624
133624
143624
153624
163624
173624
183624
193624
203624
213624
223624
233524
243524
253524
263524
273524
283524
293524
303524

How September really feels in Balsas

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.

Balsas 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
Jan31° / 22°20424.612.43.0
Feb31° / 22°18022.112.23.0
Mar31° / 22°17823.512.13.1
Apr31° / 22°11015.511.83.6
May32° / 23°406.711.74.1
Jun33° / 22°20.511.64.5
Jul33° / 22°10.211.64.4
Aug35° / 22°10.211.83.6
Sep35° / 24°91.8122.9
Oct34° / 24°557.712.23.0
Nov32° / 23°12115.312.33.3
Dec31° / 23°15719.412.43.3

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 66% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 17% of September, with mostly cloudy or overcast conditions the remaining 17%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
18713
28713
38713
48713
58713
68713
78713
88614
98614
108614
118614
128614
138614
148614
158515
168515
178317
188317
198317
208218
218218
228020
238020
247921
257822
267723
277624
287525
297525
307426

Chance of precipitation in September

Any precipitation

Balsas gets around 9 mm of rain over 1.8 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 6% and peaks near 14% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%151015202530
Rain chance (%)
12
22
32
42
52
63
73
83
93
103
113
124
134
145
155
166
176
187
197
208
218
229
239
2410
2511
2611
2712
2812
2913
3014

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the comfortable band about 39% of days. Sticky, muggy-or-worse air turns up on roughly 23% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
14513591
245035101
344935101
444934111
554934112
654934112
754933122
854833122
954833122
1054833132
1154733132
1254633133
1354633143
1444533143
1544433154
1644233164
1744133174
1844034185
1943834196
2033634206
2133434227
2233235237
2333035248
2432835269
2522635279
26224352810
27222352911
28221353012
29219353113
30118353214

Wind in September

Winds average 9 km/h in September.

Across September, daily wind ranges from about 8 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
149calm
159calm
169calm
179calm
189calm
199calm
209calm
219calm
229calm
239calm
249calm
258calm
268calm
278calm
288calm
298calm
308calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 11 h 54 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 12 minutes over September. Sunrise moves from 6:08 AM to 5:52 AM, and sunset from 5:59 PM to 5:55 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
111.96:085:59
211.96:085:59
311.96:075:59
411.96:075:59
511.96:065:59
611.96:055:59
711.96:055:59
811.96:045:59
911.96:045:58
1011.96:035:58
1111.96:035:58
1211.96:025:58
1311.96:015:58
1411.96:015:58
1512.06:005:57
1612.06:005:57
1712.05:595:57
1812.05:595:57
1912.05:585:57
2012.05:575:57
2112.05:575:56
2212.05:565:56
2312.05:565:56
2412.05:555:56
2512.05:545:56
2612.05:545:56
2712.05:535:56
2812.05:535:55
2912.15:525:55
3012.15:525:55

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 5.03 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
16.5Intense
26.5Intense
36.5Intense
46.6Intense
56.6Intense
66.6Intense
76.6Intense
86.6Intense
96.6Intense
106.6Intense
116.6Intense
126.7Intense
136.7Intense
146.7Intense
156.7Intense
166.7Intense
176.7Intense
186.6Intense
196.6Intense
206.6Intense
216.6Intense
226.6Intense
236.6Intense
246.6Intense
256.6Intense
266.5Intense
276.5Intense
286.5Intense
296.5Intense
306.5Intense
Planning a trip in September

Hazard calendar for Balsas

In seasonPeak

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

Balsas's monsoon runs November–April, 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 Balsas?

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

2.9
Sightseeing
12th-best month of the year
6.4
Beach & pool
5th-best month of the year

September is a weaker month for outdoor sightseeing in Balsas. The water and warmth also suit a beach or pool day.

What to pack for Balsas in September

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

In September, Balsas sees daytime highs around 35°C and nights near 24°C. Pack light clothes and sun protection.

light clothessun protection

UV index in Balsas in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 13 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Balsas peaks around February 20 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 22 at about 10 (very high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highExtremeFeb 20UV 15Jun 22UV 10
UV index (midday)Level
Jan14Extreme
Feb15Extreme
Mar15Extreme
Apr13Extreme
May11Extreme
Jun10Very high
Jul10Very high
Aug11Extreme
Sep13Extreme
Oct13Extreme
Nov12Extreme
Dec11Extreme

Air quality in Balsas 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 Balsas is worst in September — around 27 µg/m³ PM2.5 (moderate), about 4.3× the cleanest month (June, 6 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateSep 2027 µg/m³Jun 166 µg/m³
PM2.5 (µg/m³)Level
Jan12Good
Feb11Good
Mar12Good
Apr12Good
May7Good
Jun6Good
Jul8Good
Aug18Moderate
Sep27Moderate
Oct25Moderate
Nov16Moderate
Dec13Moderate
Location & terrain

Where is Balsas?

Balsas sits at 7.5°S, 46.0°W, 254 m above sea level, in Brazil. The nearest listed city is Riachão, 67 km away.

Topography around Balsas

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

Within 3 km, the terrain around Balsas has only modest variations in elevation — a maximum elevation change of 62 m around an average of 259 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 107 m; within 80 km, significant variations in elevation — a maximum elevation change of 455 m.

The land around Balsas is covered by artificial surfaces (36%), grassland (32%) and trees (23%) within 3 km, grassland (38%), trees (30%) and shrubs (26%) within 16 km, and trees (32%), shrubs (28%) and grassland (25%) within 80 km.

3 km
62 m
16 km
107 m
80 km
455 m
treesshrubsgrasslandcroplandartificial surfacesbare terrain
September weather nearby: Riachão 67 km · São Raimundo das Mangabeiras 83 km · Formosa da Serra Negra 122 km · Carolina 159 km · Uruçuí 167 km · Estreito 189 km · Grajaú 191 km · Sítio Novo 198 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 Balsas (-7.5325°, -46.0356°, elevation 254 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).