Caxias weather in September

In September, Caxias sees average daytime highs of 36°C and overnight lows near 24°C, with 5 mm of rain across 1.1 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 36°C through the month. The sky is clear or mostly clear about 72% 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 Caxias's 2nd-clearest and 3rd-windiest month. For the whole year in context, see Caxias's year-round climate.

Daytime high
36°
2nd warmest
Overnight low
24°
9th coldest
Rainfall
5 mm
1.1 wet days
Daylight
12 hours
5:49 AM – 5:47 PM
Cloud cover
33%
2nd clearest
Wind
8 km/h
3rd windiest
Solar energy
6.48 kWh/m²
Travel score
2.6
out of 10

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 36°C through the month.

A typical September day in Caxias reaches about 36°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 35°C and 37°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)
13524
23524
33524
43624
53624
63624
73624
83624
93624
103624
113624
123624
133624
143624
153624
163624
173624
183624
193624
203624
213624
223624
233624
243624
253624
263624
273624
283624
293624
303624

How September really feels in Caxias

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
6 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.

Caxias 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
Jan32° / 23°23624.312.32.7
Feb31° / 23°27223.412.22.7
Mar31° / 23°34527.9122.6
Apr31° / 23°28225.311.92.8
May32° / 23°12814.911.83.7
Jun32° / 23°224.411.74.4
Jul33° / 23°101.811.74.2
Aug35° / 23°30.511.83.5
Sep36° / 24°51.1122.6
Oct36° / 25°142.412.12.2
Nov35° / 25°477.112.22.5
Dec34° / 24°1041312.32.7

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 72% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 19% of September, with mostly cloudy or overcast conditions the remaining 10%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
1928
2928
3928
4919
5919
6919
7919
8919
9919
10919
11919
12919
139010
149010
159010
169010
179010
189010
199010
209010
219010
229010
239010
249010
259010
269010
278911
288911
298911
308911

Chance of precipitation in September

Any precipitation

Caxias gets around 5 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 5% on the wettest days.

0%10%20%30%151015202530
Rain chance (%)
11
22
32
42
52
62
72
82
92
102
113
123
133
143
153
164
174
184
194
205
215
225
235
245
255
265
275
285
295
305

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 61% of days. Sticky, muggy-or-worse air turns up on roughly 77% of them.

0%25%50%75%100%151015202530
Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
14265416
24265416
34265416
44275316
54275415
64275415
74275415
84275415
94275415
104275415
114265614
124265614
133255814
143245914
153236014
163226015
173216115
182206216
192186416
202176516
212166517
221146817
231136917
241127017
251117018
261107118
27197218
28097219
29097219
30097120

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 8 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
18calm
28calm
38calm
48calm
58calm
68calm
78calm
88calm
98calm
108calm
118calm
128calm
138calm
148calm
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 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 5:56 AM to 5:42 AM, and sunset from 5:50 PM to 5:44 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
111.95:565:50
211.95:555:50
311.95:555:50
411.95:555:50
511.95:545:49
611.95:545:49
711.95:535:49
811.95:535:49
911.95:525:49
1011.95:525:48
1112.05:515:48
1212.05:515:48
1312.05:505:48
1412.05:505:47
1512.05:495:47
1612.05:495:47
1712.05:485:47
1812.05:485:46
1912.05:475:46
2012.05:475:46
2112.05:465:46
2212.05:455:46
2312.05:455:45
2412.05:445:45
2512.05:445:45
2612.05:445:45
2712.05:435:44
2812.05:435:44
2912.05:425:44
3012.05:425:44

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 6.48 kWh/m².

For context, solar energy here swings from a low near 4.57 kWh/m² to a high of 6.53 kWh/m² in October across the year — September's 6.48 kWh/m² sits near the top of that range.

0246151015202530
Solar energy (kWh/m²)Level
16.3Intense
26.3Intense
36.3Intense
46.3Intense
56.3Intense
66.4Intense
76.4Intense
86.4Intense
96.4Intense
106.4Intense
116.4Intense
126.5Intense
136.5Intense
146.5Intense
156.5Intense
166.5Intense
176.5Intense
186.5Intense
196.5Intense
206.5Intense
216.5Intense
226.5Intense
236.5Intense
246.6Intense
256.6Intense
266.6Intense
276.6Intense
286.6Intense
296.6Intense
306.6Intense
Planning a trip in September

Hazard calendar for Caxias

In seasonPeak

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

Caxias'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 Caxias?

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

2.6
Sightseeing
9th-best month of the year
6.2
Beach & pool
4th-best month of the year

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

What to pack for Caxias in September

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

In September, Caxias sees daytime highs around 36°C and nights near 24°C. Pack light clothes and sun protection.

light clothessun protection

UV index in Caxias 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 Caxias peaks around March 13 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.

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highExtremeMar 13UV 15Jul 24UV 10
UV index (midday)Level
Jan13Extreme
Feb15Extreme
Mar15Extreme
Apr13Extreme
May11Extreme
Jun10Very high
Jul10Very high
Aug10Very high
Sep12Extreme
Oct12Extreme
Nov11Extreme
Dec11Extreme

Air quality in Caxias 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 Caxias is worst in October — around 33 µg/m³ PM2.5 (moderate), about 2.9× the cleanest month (May, 11 µg/m³).

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

010203040JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodModerateOct 1532 µg/m³May 1512 µg/m³
PM2.5 (µg/m³)Level
Jan14Moderate
Feb15Moderate
Mar14Moderate
Apr13Moderate
May11Good
Jun13Moderate
Jul27Moderate
Aug28Moderate
Sep29Moderate
Oct33Moderate
Nov28Moderate
Dec20Moderate
Location & terrain

Where is Caxias?

Caxias sits at 4.9°S, 43.4°W, 83 m above sea level, in Brazil. The nearest listed city is Aldeias Altas, 29 km away.

Topography around Caxias

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

Within 3 km, the terrain around Caxias has only modest variations in elevation — a maximum elevation change of 73 m around an average of 82 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 147 m; within 80 km, significant variations in elevation — a maximum elevation change of 259 m.

The land around Caxias is covered by artificial surfaces (42%) and trees (31%) within 3 km, trees (67%) and shrubs (21%) within 16 km, and trees (70%) within 80 km.

3 km
73 m
16 km
147 m
80 km
259 m
treesshrubsgrasslandcroplandartificial surfacesbare terrain
September weather nearby: Aldeias Altas 29 km · São João do Soter 58 km · União 62 km · Timon 63 km · Teresina 67 km · Codó 74 km · Matões 75 km · Coelho Neto 77 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 Caxias (-4.8589°, -43.3561°, elevation 83 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).