São Luís de Montes Belos weather in September

In September, São Luís de Montes Belos sees average daytime highs of 34°C and overnight lows near 21°C, with 29 mm of rain across 5.2 wet days and about 11.9 hours of daylight. It is the 1st-warmest and 8th-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 52% of the time in September, and the air most often feels dry.

Daylight stretches from about 11 h 42 min at the start of September to 12 h 06 min by month's end. Set against the rest of the year, September is São Luís de Montes Belos's 5th-clearest and 2nd-windiest month. For the whole year in context, see São Luís de Montes Belos's year-round climate.

Daytime high
34°
1st warmest
Overnight low
21°
11th coldest
Rainfall
29 mm
5.2 wet days
Daylight
11 h 54 min
7:19 AM – 7:13 PM
Cloud cover
42%
5th clearest
Wind
8 km/h
2nd windiest
Solar energy
5.96 kWh/m²
Travel score
3.7
out of 10

São Luís de Montes Belos 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 São Luís de Montes Belos 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 30°C and 37°C. Set against its neighbours, September runs about 1°C warmer than August and about 1°C warmer than October.

15°20°25°30°35°40°151015202530
Avg high (°C)Avg low (°C)
13320
23420
33420
43420
53421
63421
73421
83421
93421
103421
113421
123421
133421
143421
153421
163421
173421
183421
193421
203421
213421
223421
233321
243321
253321
263321
273321
283321
293321
303322

How September really feels in São Luís de Montes Belos

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.

São Luís de Montes Belos weather by month

How September compares with the rest of the year at a glance. September is the 1st-warmest and 8th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan29° / 21°2592512.93.5
Feb29° / 21°1932212.63.5
Mar30° / 21°19123.212.13.6
Apr30° / 20°8712.311.64.7
May30° / 19°132.411.26.2
Jun30° / 17°40.6116.5
Jul30° / 17°20.311.16.4
Aug32° / 19°70.811.45.1
Sep34° / 21°295.211.93.7
Oct32° / 22°10716.212.43.2
Nov30° / 21°18522.712.83.4
Dec29° / 21°23825.3133.4

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 20% of September, with mostly cloudy or overcast conditions the remaining 28%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
18119
28119
38119
48119
58020
67921
77921
87921
97822
107723
117624
127624
137525
147426
157426
167228
177228
187129
197030
206931
216832
226634
236535
246436
256337
266238
276040
286040
295941
305842

Chance of precipitation in September

Any precipitation

São Luís de Montes Belos gets around 29 mm of rain over 5.2 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 18% and peaks near 37% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%40%50%151015202530
Rain chance (%)
16
26
37
47
58
68
79
89
910
1011
1112
1212
1313
1414
1515
1616
1717
1819
1920
2021
2123
2224
2326
2428
2529
2631
2733
2834
2935
3037

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 41% of days. Sticky, muggy-or-worse air turns up on roughly 16% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
162211340
261211440
360211450
460211450
558211560
658211560
756211670
856211670
955211680
1054211780
1152221790
12502218100
13482318110
14462319110
15442320120
16422421130
17402422140
18372423160
19342424170
20322425180
21292426200
22272327220
23252328240
24232229260
25212130280
26192030301
27181830321
28171730351
29161730371
30151629391

Wind in September

Winds average 8 km/h in September.

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
19calm
29calm
39calm
49calm
59calm
69calm
79calm
89calm
99calm
109calm
119calm
129calm
139calm
149calm
158calm
168calm
178calm
188calm
198calm
208calm
218calm
228calm
238calm
248calm
258calm
268calm
278calm
288calm
298calm
308calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 11 h 42 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 24 minutes over September. Sunrise moves from 7:31 AM to 7:07 AM, and sunset from 7:11 PM to 7:15 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
111.77:317:11
211.77:307:12
311.77:297:12
411.77:297:12
511.77:287:12
611.87:277:12
711.87:267:12
811.87:257:12
911.87:247:12
1011.87:247:12
1111.87:237:13
1211.87:227:13
1311.97:217:13
1411.97:207:13
1511.97:197:13
1611.97:197:13
1711.97:187:13
1811.97:177:13
1912.07:167:13
2012.07:157:13
2112.07:147:14
2212.07:137:14
2312.07:137:14
2412.07:127:14
2512.17:117:14
2612.17:107:14
2712.17:097:14
2812.17:087:14
2912.17:087:15
3012.17:077:15

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.96 kWh/m².

For context, solar energy here swings from a low near 4.5 kWh/m² to a high of 6.06 kWh/m² in October across the year — September's 5.96 kWh/m² sits near the top of that range.

0246151015202530
Solar energy (kWh/m²)Level
15.8Bright
25.8Bright
35.8Bright
45.8Bright
55.9Bright
65.9Bright
75.9Bright
85.9Bright
95.9Bright
105.9Bright
115.9Bright
125.9Bright
135.9Bright
146.0Bright
156.0Bright
166.0Bright
176.0Bright
186.0Bright
196.0Bright
206.0Bright
216.0Bright
226.0Bright
236.0Bright
246.0Bright
256.0Bright
266.0Bright
276.0Intense
286.0Intense
296.0Intense
306.0Intense
Planning a trip in September

Hazard calendar for São Luís de Montes Belos

In seasonPeak

None of São Luís de Montes Belos'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 Luís de Montes Belos'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 Luís de Montes Belos?

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

3.7
Sightseeing
6th-best month of the year
6.9
Beach & pool
5th-best month of the year

September is a weaker month for outdoor sightseeing in São Luís de Montes Belos. The water and warmth also suit a beach or pool day.

What to pack for São Luís de Montes Belos in September

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

In September, São Luís de Montes Belos sees daytime highs around 34°C and nights near 21°C. Pack light clothes. Worth having: sun protection. About 5 days see rain.

light clothessun protection

UV index in São Luís de Montes Belos 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 São Luís de Montes Belos peaks around January 21 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 22 at about 8 (very high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highExtremeJan 21UV 15Jun 22UV 8
UV index (midday)Level
Jan15Extreme
Feb15Extreme
Mar14Extreme
Apr12Extreme
May9Very high
Jun8Very high
Jul8Very high
Aug9Very high
Sep12Extreme
Oct13Extreme
Nov13Extreme
Dec14Extreme

Air quality in São Luís de Montes Belos 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 Luís de Montes Belos is worst in September — around 21 µg/m³ PM2.5 (moderate), about 3.2× the cleanest month (June, 7 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodSep 1720 µg/m³Jun 237 µg/m³
PM2.5 (µg/m³)Level
Jan8Good
Feb8Good
Mar8Good
Apr8Good
May7Good
Jun7Good
Jul7Good
Aug11Good
Sep21Moderate
Oct13Moderate
Nov7Good
Dec7Good
Location & terrain

Where is São Luís de Montes Belos?

São Luís de Montes Belos sits at 16.5°S, 50.4°W, 579 m above sea level, in Brazil. The nearest listed city is Anicuns, 44 km away.

Topography around São Luís de Montes Belos

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of São Luís de Montes Belos.

Within 3 km, the terrain around São Luís de Montes Belos has only modest variations in elevation — a maximum elevation change of 248 m around an average of 580 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 373 m; within 80 km, large variations in elevation — a maximum elevation change of 729 m.

The land around São Luís de Montes Belos is covered by grassland (39%), artificial surfaces (25%) and trees (21%) within 3 km, grassland (51%) and cropland (31%) within 16 km, and grassland (37%), cropland (37%) and trees (25%) within 80 km.

3 km
248 m
16 km
373 m
80 km
729 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Anicuns 44 km · Palmeiras de Goiás 57 km · Goiás 70 km · Indiara 79 km · Iporá 80 km · Itaberaí 82 km · Jussara 90 km · Trindade 95 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 Luís de Montes Belos (-16.525°, -50.3722°, elevation 579 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).