Campo Maior weather in September

In September, Campo Maior sees average daytime highs of 37°C and overnight lows near 26°C, with 2 mm of rain across 0.4 wet days and about 12 hours of daylight. It is the 2nd-warmest and 11th-wettest month of the year here.

Day-to-day highs hold fairly steady near 37°C through the month. The sky is clear or mostly clear about 78% of the time in September, and the air most often feels humid.

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 Campo Maior's 1st-clearest and 1st-windiest month. For the whole year in context, see Campo Maior's year-round climate.

Daytime high
37°
2nd warmest
Overnight low
26°
9th coldest
Rainfall
2 mm
0.4 wet days
Daylight
12 hours
5:44 AM – 5:42 PM
Cloud cover
30%
1st clearest
Wind
12 km/h
1st windiest
Solar energy
6.76 kWh/m²
Travel score
1.9
out of 10

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 37°C through the month.

A typical September day in Campo Maior reaches about 37°C in the afternoon and slips back to 26°C overnight — a 12°C spread between the day's warmth and the night's chill. On most days the high lands between 36°C and 38°C. Set against its neighbours, September runs about 1°C warmer than August and on par with October.

20°25°30°35°40°151015202530
Avg high (°C)Avg low (°C)
13725
23725
33725
43725
53725
63725
73725
83725
93725
103725
113725
123726
133726
143726
153726
163726
173726
183726
193726
203726
213726
223726
233726
243826
253826
263826
273826
283826
293826
303826

How September really feels in Campo Maior

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
4 feel dangerously hot (≥ 39°C)
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.

Campo Maior weather by month

How September compares with the rest of the year at a glance. September is the 2nd-warmest and 11th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan33° / 24°21419.612.22.5
Feb32° / 24°24120.312.22.6
Mar32° / 24°31425.3122.6
Apr32° / 24°2502211.92.8
May33° / 24°10211.411.83.5
Jun34° / 24°143.111.73.8
Jul34° / 24°71.211.73.6
Aug36° / 25°10.311.82.8
Sep37° / 26°20.4121.9
Oct38° / 26°141.412.11.5
Nov37° / 26°253.812.21.7
Dec36° / 26°758.812.32.1

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 78% of the time in September, the clearest month of the year.

Beyond those clear spells, partly cloudy skies cover about 13% of September, with mostly cloudy or overcast conditions the remaining 9%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
1928
2928
3928
4928
5928
6919
7919
8919
9928
10928
11928
12928
13928
14919
15919
16919
17919
18919
19919
20928
21919
22919
23919
24919
25919
26919
27919
28919
298911
308911

Chance of precipitation in September

Any precipitation

Campo Maior gets around 2 mm of rain over 0.4 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 2% and peaks near 3% on the wettest days.

0%10%20%30%151015202530
Rain chance (%)
11
21
31
41
51
61
71
81
91
101
111
121
131
141
151
161
171
182
192
202
212
222
232
242
252
262
272
282
293
303

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the humid band about 52% of days. Sticky, muggy-or-worse air turns up on roughly 27% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
112350251
212351241
312351241
412352231
512452221
612452221
712452221
812452221
912453220
1012453220
1112354220
1212353230
1312353230
1412253240
1512154240
1612153250
1712053260
1811953270
1911952280
2011852290
2111752300
2201652311
2301652311
2401552321
2501453321
2601452331
2701452331
2801352341
2901352341
3001352341

Wind in September

Winds average 12 km/h in September, the windiest month of the year.

Across September, daily wind ranges from about 11 km/h on the calmest days to 12 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
112calm
212calm
312calm
412calm
512calm
612calm
712calm
812calm
912calm
1012calm
1112calm
1212calm
1312calm
1412calm
1512calm
1612calm
1712calm
1812calm
1912calm
2012calm
2112calm
2211calm
2311calm
2411calm
2511calm
2611calm
2711calm
2811calm
2911calm
3011calm

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 5:51 AM to 5:37 AM, and sunset from 5:46 PM to 5:39 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
111.95:515:46
211.95:515:45
311.95:505:45
411.95:505:45
511.95:495:45
611.95:495:45
711.95:485:44
811.95:485:44
911.95:475:44
1011.95:475:44
1112.05:465:43
1212.05:465:43
1312.05:455:43
1412.05:455:43
1512.05:445:42
1612.05:445:42
1712.05:435:42
1812.05:435:42
1912.05:425:42
2012.05:425:41
2112.05:415:41
2212.05:415:41
2312.05:405:41
2412.05:405:40
2512.05:395:40
2612.05:395:40
2712.05:385:40
2812.05:385:40
2912.05:375:39
3012.05:375:39

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 6.76 kWh/m².

For context, solar energy here swings from a low near 4.94 kWh/m² to a high of 6.85 kWh/m² in October across the year — September's 6.76 kWh/m² sits near the top of that range.

0246151015202530
Solar energy (kWh/m²)Level
16.5Intense
26.6Intense
36.6Intense
46.6Intense
56.6Intense
66.6Intense
76.7Intense
86.7Intense
96.7Intense
106.7Intense
116.7Intense
126.7Intense
136.7Intense
146.8Intense
156.8Intense
166.8Intense
176.8Intense
186.8Intense
196.8Intense
206.8Intense
216.8Intense
226.8Intense
236.8Intense
246.8Intense
256.8Intense
266.9Intense
276.9Intense
286.9Intense
296.9Intense
306.9Intense
Planning a trip in September

Hazard calendar for Campo Maior

In seasonPeak

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

Campo Maior's monsoon runs January–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 Campo Maior?

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

1.9
Sightseeing
10th-best month of the year
5.4
Beach & pool
5th-best month of the year

September is a weaker month for outdoor sightseeing in Campo Maior.

What to pack for Campo Maior in September

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

In September, Campo Maior sees daytime highs around 37°C and nights near 26°C. Pack light clothes and sun protection.

light clothessun protection

UV index in Campo Maior 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 Campo Maior peaks around March 15 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 24 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 15UV 15Jul 24UV 10
UV index (midday)Level
Jan13Extreme
Feb14Extreme
Mar15Extreme
Apr14Extreme
May11Extreme
Jun10Extreme
Jul10Very high
Aug10Very high
Sep12Extreme
Oct12Extreme
Nov12Extreme
Dec11Extreme

Air quality in Campo Maior 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 Campo Maior is worst in November — around 16 µg/m³ PM2.5 (moderate), about 3.6× the cleanest month (July, 4 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodModerateNov 1816 µg/m³Jul 155 µg/m³
PM2.5 (µg/m³)Level
Jan12Good
Feb13Moderate
Mar12Moderate
Apr11Good
May8Good
Jun6Good
Jul4Good
Aug6Good
Sep7Good
Oct12Moderate
Nov16Moderate
Dec14Moderate
Location & terrain

Where is Campo Maior?

Campo Maior sits at 4.8°S, 42.2°W, 128 m above sea level, in Brazil. The nearest listed city is Altos, 40 km away.

Topography around Campo Maior

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

Within 3 km, the terrain around Campo Maior has only modest variations in elevation — a maximum elevation change of 21 m around an average of 120 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 295 m; within 80 km, significant variations in elevation — a maximum elevation change of 497 m.

The land around Campo Maior is covered by grassland (54%) within 3 km, grassland (60%) and shrubs (27%) within 16 km, and trees (39%), shrubs (36%) and grassland (23%) within 80 km.

3 km
21 m
16 km
295 m
80 km
497 m
treesshrubsgrasslandcroplandartificial surfacesbare terrainwaterwetland
September weather nearby: Altos 40 km · José de Freitas 46 km · Barras 66 km · Piripiri 75 km · Teresina 76 km · Timon 80 km · Demerval Lobão 82 km · União 82 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 Campo Maior (-4.8278°, -42.1686°, elevation 128 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).