João Lisboa weather in September

In September, João Lisboa sees average daytime highs of 35°C and overnight lows near 23°C, with 10 mm of rain across 2 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 muggy.

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 João Lisboa's 3rd-clearest and 3rd-windiest month. For the whole year in context, see João Lisboa's year-round climate.

Daytime high
35°
1st warmest
Overnight low
23°
10th coldest
Rainfall
10 mm
2 wet days
Daylight
12 hours
6:05 AM – 6:03 PM
Cloud cover
36%
3rd clearest
Wind
9 km/h
3rd windiest
Solar energy
6.3 kWh/m²
Travel score
3.3
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 João Lisboa reaches about 35°C in the afternoon and slips back to 23°C overnight — a 11°C spread between the day's warmth and the night's chill. On most days the high lands between 33°C and 36°C. Set against its neighbours, September runs on par with August and about 1°C warmer than October.

20°25°30°35°40°151015202530
Avg high (°C)Avg low (°C)
13523
23523
33523
43523
53523
63523
73523
83523
93523
103523
113523
123523
133523
143523
153523
163523
173524
183524
193524
203524
213524
223524
233524
243524
253524
263524
273424
283424
293424
303424

How September really feels in João Lisboa

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.

João Lisboa 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° / 23°20726.112.32.9
Feb30° / 23°20523.912.22.9
Mar31° / 23°21226.4122.9
Apr31° / 23°15120.711.93.2
May32° / 23°7411.811.84.0
Jun33° / 22°81.811.74.5
Jul34° / 22°61.111.74.1
Aug35° / 22°20.411.83.6
Sep35° / 23°102123.3
Oct34° / 24°396.312.13.4
Nov32° / 24°10014.212.23.3
Dec31° / 23°14620.212.33.2

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
28614
38614
48614
58614
68614
78614
88614
98614
108614
118515
128515
138515
148515
158515
168416
178416
188416
198317
208218
218119
228119
238119
247921
257921
267822
277822
287822
297723
307723

Chance of precipitation in September

Any precipitation

João Lisboa gets around 10 mm of rain over 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 7% and peaks near 11% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%151015202530
Rain chance (%)
14
24
34
44
55
65
75
85
95
105
115
125
135
145
155
166
176
186
197
207
218
228
239
249
2510
2610
2710
2811
2911
3011

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the muggy band about 51% of days. Sticky, muggy-or-worse air turns up on roughly 82% of them.

0%25%50%75%100%151015202530
Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
14265119
24265020
34265020
44255021
54254922
64254922
74254923
84244923
94244924
103234924
113225025
123215125
133205126
143195226
153185227
163175327
172155528
182145430
192125531
202115433
212105434
22295336
23185338
24175240
25165142
26165044
27154945
28044847
29044749
30044650

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 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
198calm
208calm
218calm
228calm
238calm
248calm
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 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 6:12 AM to 5:58 AM, and sunset from 6:06 PM to 6:00 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
111.96:126:06
211.96:126:06
311.96:116:06
411.96:116:06
511.96:116:05
611.96:106:05
711.96:096:05
811.96:096:05
911.96:086:05
1011.96:086:04
1111.96:076:04
1212.06:076:04
1312.06:066:04
1412.06:066:03
1512.06:056:03
1612.06:056:03
1712.06:046:03
1812.06:046:03
1912.06:036:02
2012.06:036:02
2112.06:026:02
2212.06:026:02
2312.06:016:02
2412.06:016:01
2512.06:006:01
2612.06:006:01
2712.05:596:01
2812.05:596:01
2912.05:586:00
3012.05:586:00

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 6.3 kWh/m² — the sunniest month for solar.

For context, solar energy here swings from a low near 4.5 kWh/m² to a high of 6.3 kWh/m² in September across the year — September's 6.3 kWh/m² sits near the top of that range.

0246151015202530
Solar energy (kWh/m²)Level
16.2Intense
26.2Intense
36.2Intense
46.3Intense
56.3Intense
66.3Intense
76.3Intense
86.3Intense
96.3Intense
106.3Intense
116.3Intense
126.3Intense
136.3Intense
146.3Intense
156.3Intense
166.3Intense
176.3Intense
186.3Intense
196.3Intense
206.3Intense
216.3Intense
226.3Intense
236.3Intense
246.3Intense
256.3Intense
266.3Intense
276.3Intense
286.3Intense
296.3Intense
306.3Intense
Planning a trip in September

Hazard calendar for João Lisboa

In seasonPeak

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

João Lisboa'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 João Lisboa?

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

3.3
Sightseeing
6th-best month of the year
6.9
Beach & pool
4th-best month of the year

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

What to pack for João Lisboa in September

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

In September, João Lisboa sees daytime highs around 35°C and nights near 23°C. Pack light clothes and sun protection.

light clothessun protection

UV index in João Lisboa 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 João Lisboa peaks around March 12 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 12 at about 10 (extreme).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeMar 12UV 15Jul 12UV 10
UV index (midday)Level
Jan13Extreme
Feb15Extreme
Mar15Extreme
Apr14Extreme
May11Extreme
Jun10Extreme
Jul10Very high
Aug11Extreme
Sep12Extreme
Oct12Extreme
Nov11Extreme
Dec10Extreme

Air quality in João Lisboa 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 João Lisboa is worst in October — around 29 µg/m³ PM2.5 (moderate), about 4.9× the cleanest month (June, 6 µg/m³).

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

010203040JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodModerateOct 2329 µg/m³Jun 206 µg/m³
PM2.5 (µg/m³)Level
Jan14Moderate
Feb13Moderate
Mar13Moderate
Apr12Moderate
May9Good
Jun6Good
Jul7Good
Aug12Moderate
Sep23Moderate
Oct29Moderate
Nov29Moderate
Dec20Moderate
Location & terrain

Where is João Lisboa?

João Lisboa sits at 5.4°S, 47.4°W, 172 m above sea level, in Brazil. The nearest listed city is Imperatriz, 13 km away.

Topography around João Lisboa

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

Within 3 km, the terrain around João Lisboa has only modest variations in elevation — a maximum elevation change of 77 m around an average of 162 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 315 m; within 80 km, significant variations in elevation — a maximum elevation change of 434 m.

The land around João Lisboa is covered by grassland (51%) and trees (39%) within 3 km, grassland (51%) and trees (41%) within 16 km, and grassland (54%) and trees (43%) within 80 km.

3 km
77 m
16 km
315 m
80 km
434 m
treesshrubsgrasslandcroplandartificial surfaceswater
September weather nearby: Imperatriz 13 km · Governador Edison Lobão 33 km · Açailândia 57 km · Amarante do Maranhão 74 km · Araguatins 82 km · Sítio Novo 91 km · Tocantinópolis 98 km · Porto Franco 99 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 João Lisboa (-5.4478°, -47.4008°, elevation 172 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).