Cássia weather in September

In September, Cássia sees average daytime highs of 28°C and overnight lows near 18°C, with 52 mm of rain across 6.7 wet days and about 11.9 hours of daylight. It is the 3rd-warmest and 7th-wettest month of the year here.

Day-to-day highs hold fairly steady near 28°C through the month. The sky is clear or mostly clear about 52% of the time in September, and the air most often feels comfortable.

Daylight stretches from about 11 h 36 min at the start of September to 12 h 12 min by month's end. Set against the rest of the year, September is Cássia's 4th-clearest and 1st-windiest month. For the whole year in context, see Cássia's year-round climate.

Daytime high
28°
3rd warmest
Overnight low
18°
5th coldest
Rainfall
52 mm
6.7 wet days
Daylight
11 h 54 min
7:05 AM – 6:59 PM
Cloud cover
43%
4th clearest
Wind
8 km/h
1st windiest
Solar energy
5.72 kWh/m²
Travel score
6.7
out of 10

Cássia 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 28°C through the month.

A typical September day in Cássia reaches about 28°C in the afternoon and slips back to 18°C overnight — a 11°C spread between the day's warmth and the night's chill. On most days the high lands between 24°C and 32°C. Set against its neighbours, September runs about 2°C warmer than August and on par with October.

10°15°20°25°30°35°151015202530
Avg high (°C)Avg low (°C)
12816
22817
32817
42817
52817
62817
72817
82817
92817
102817
112817
122817
132817
142818
152818
162818
172818
182818
192818
202818
212818
222818
232818
242818
252818
262818
272818
282818
292818
302818

Cássia weather by month

How September compares with the rest of the year at a glance. September is the 3rd-warmest and 7th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan28° / 21°22221.813.14.3
Feb28° / 21°15617.912.74.5
Mar28° / 20°14118.112.15.0
Apr27° / 19°518.511.56.8
May25° / 16°304.8117.8
Jun25° / 15°172.310.88.5
Jul25° / 14°101.910.98.6
Aug27° / 15°122.311.38.3
Sep28° / 18°526.711.96.7
Oct29° / 19°9112.412.55.3
Nov28° / 20°15518.2134.9
Dec28° / 20°20623.113.24.4

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 14% of September, with mostly cloudy or overcast conditions the remaining 33%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
17921
27921
37822
47723
57723
67624
77525
87426
97327
107327
117129
127030
136931
146733
156733
166634
176535
186535
196337
206238
216139
226040
235941
245842
255842
265743
275644
285644
295545
305446

Chance of precipitation in September

Any precipitation

Cássia gets around 52 mm of rain over 6.7 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 23% and peaks near 34% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%40%151015202530
Rain chance (%)
113
213
314
414
515
615
716
816
917
1018
1118
1219
1319
1420
1521
1622
1723
1824
1925
2026
2127
2228
2329
2430
2530
2631
2732
2833
2934
3034

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 36% of days. Sticky, muggy-or-worse air turns up on roughly 6% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
14043171
23943171
33842181
43842191
53741201
63641211
73640232
83540242
93439252
103339262
113138283
123038293
132938303
142738314
152638324
162438344
172337355
182237365
192136376
201936386
211835407
221734418
231633419
2415324210
2514314311
2614304313
2713294414
2812284416
2912274417
3011274418

Wind in September

Winds average 8 km/h in September, the windiest month of the year.

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.

0246810151015202530
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 36 min at the start of September to 12 h 12 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 36 minutes over September. Sunrise moves from 7:20 AM to 6:52 AM, and sunset from 6:55 PM to 7:02 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
111.67:206:55
211.67:196:55
311.67:186:55
411.67:176:56
511.77:166:56
611.77:156:56
711.77:146:56
811.77:136:57
911.77:126:57
1011.87:116:57
1111.87:106:57
1211.87:096:58
1311.87:086:58
1411.87:076:58
1511.97:066:58
1611.97:056:59
1711.97:056:59
1811.97:046:59
1911.97:036:59
2012.07:026:59
2112.07:017:00
2212.07:007:00
2312.06:597:00
2412.06:587:00
2512.16:577:01
2612.16:567:01
2712.16:557:01
2812.16:547:01
2912.16:537:02
3012.26:527:02

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.72 kWh/m².

For context, solar energy here swings from a low near 4 kWh/m² to a high of 5.96 kWh/m² in October across the year — September's 5.72 kWh/m² sits near the top of that range.

0246151015202530
Solar energy (kWh/m²)Level
15.6Bright
25.6Bright
35.6Bright
45.6Bright
55.6Bright
65.7Bright
75.7Bright
85.7Bright
95.7Bright
105.7Bright
115.7Bright
125.7Bright
135.7Bright
145.7Bright
155.7Bright
165.7Bright
175.7Bright
185.7Bright
195.7Bright
205.8Bright
215.8Bright
225.8Bright
235.8Bright
245.8Bright
255.8Bright
265.8Bright
275.8Bright
285.8Bright
295.8Bright
305.8Bright
Planning a trip in September

Hazard calendar for Cássia

In seasonPeak

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

Cássia'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 Cássia?

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

6.7
Sightseeing
6th-best month of the year
7.6
Beach & pool
3rd-best month of the year

September is a reasonable time to visit Cássia for sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Cássia in September

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

In September, Cássia sees daytime highs around 28°C and nights near 18°C. Pack light clothes. Worth having: sun protection. About 7 days see rain.

light clothessun protection

UV index in Cássia in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 10 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Cássia peaks around January 21 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 20 at about 7 (high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highHighVery highExtremeJan 21UV 15Jun 20UV 7
UV index (midday)Level
Jan15Extreme
Feb15Extreme
Mar13Extreme
Apr11Extreme
May8Very high
Jun7High
Jul7Very high
Aug9Very high
Sep10Extreme
Oct12Extreme
Nov15Extreme
Dec14Extreme

Air quality in Cássia 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 Cássia is worst in September — around 40 µg/m³ PM2.5 (poor), about 5.7× the cleanest month (November, 7 µg/m³).

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

010203040JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateModerateGoodSep 1537 µg/m³Nov 227 µg/m³
PM2.5 (µg/m³)Level
Jan8Good
Feb9Good
Mar9Good
Apr9Good
May9Good
Jun9Good
Jul10Good
Aug18Moderate
Sep40Poor
Oct14Moderate
Nov7Good
Dec8Good
Location & terrain

Where is Cássia?

Cássia sits at 20.6°S, 46.9°W, 740 m above sea level, in Brazil. The nearest listed city is Passos, 36 km away.

Topography around Cássia

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

Within 3 km, the terrain around Cássia has only modest variations in elevation — a maximum elevation change of 231 m around an average of 770 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 624 m; within 80 km, large variations in elevation — a maximum elevation change of 966 m.

The land around Cássia is covered by grassland (44%) and trees (30%) within 3 km, grassland (42%), trees (33%) and cropland (22%) within 16 km, and trees (34%), grassland (34%) and cropland (24%) within 80 km.

3 km
231 m
16 km
624 m
80 km
966 m
treesshrubsgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Passos 36 km · São Sebastião do Paraíso 38 km · Franca 50 km · Alpinópolis 64 km · Monte Santo de Minas 68 km · Altinópolis 68 km · Pedregulho 68 km · Batatais 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 Cássia (-20.5831°, -46.9219°, elevation 740 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).