Ceará-Mirim weather in September

In September, Ceará-Mirim sees average daytime highs of 29°C and overnight lows near 22°C, with 12 mm of rain across 4.6 wet days and about 12 hours of daylight. It is the 9th-warmest and 10th-wettest month of the year here.

Day-to-day highs hold fairly steady near 29°C through the month. The sky is clear or mostly clear about 58% 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 Ceará-Mirim's 1st-clearest and 1st-windiest month. For the whole year in context, see Ceará-Mirim's year-round climate.

Daytime high
29°
9th warmest
Overnight low
22°
3rd coldest
Rainfall
12 mm
4.6 wet days
Daylight
12 hours
5:17 AM – 5:15 PM
Cloud cover
39%
1st clearest
Wind
19 km/h
1st windiest
Solar energy
6.03 kWh/m²
Travel score
6.2
out of 10

Ceará-Mirim 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 29°C through the month.

A typical September day in Ceará-Mirim reaches about 29°C in the afternoon and slips back to 22°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 28°C and 31°C. Set against its neighbours, September runs about 1°C warmer than August and on par with October.

20°25°30°35°151015202530
Avg high (°C)Avg low (°C)
12922
22922
32922
42922
52922
62922
72922
82922
92922
102922
112922
122922
132922
142922
152922
162922
172922
182922
193022
203022
213023
223023
233023
243023
253023
263023
273023
283023
293023
303023

How September really feels in Ceará-Mirim

Once humidity and wind are folded in, September averages 1 day 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
1
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.

Ceará-Mirim weather by month

How September compares with the rest of the year at a glance. September is the 9th-warmest and 10th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan31° / 24°5114.512.34.2
Feb31° / 24°6415.512.23.9
Mar31° / 24°9920.4123.6
Apr30° / 24°11320.211.93.8
May30° / 23°8515.411.74.6
Jun29° / 22°7514.511.75.2
Jul28° / 22°6112.111.75.8
Aug29° / 22°217.111.86.3
Sep29° / 22°124.6126.2
Oct30° / 23°103.512.15.9
Nov30° / 24°124.712.35.5
Dec31° / 24°239.512.34.8

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 58% of the time in September, the clearest month of the year.

Beyond those clear spells, partly cloudy skies cover about 31% of September, with mostly cloudy or overcast conditions the remaining 11%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
18713
28812
38812
48812
58812
68812
78812
88812
98812
108812
118812
128911
138911
148911
158911
168911
178911
189010
199010
209010
219010
229010
23919
24919
25919
26919
27919
289010
29919
30919

Chance of precipitation in September

Any precipitation

Ceará-Mirim gets around 12 mm of rain over 4.6 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 16% and peaks near 21% on the wettest days. The odds ease toward the end of the month.

0%10%20%30%151015202530
Rain chance (%)
121
221
320
420
520
620
720
820
920
1019
1119
1219
1318
1418
1517
1616
1716
1815
1914
2014
2113
2212
2312
2411
2511
2610
2710
2810
2910
3010

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 78% of days. Sticky, muggy-or-worse air turns up on roughly 98% of them.

0%25%50%75%100%151015202530
Humid (%)Muggy (%)Oppressive (%)
128117
228117
328117
428117
528117
628216
728117
828117
928117
1028117
1128018
1228018
1328018
1418019
1518019
1617920
1717821
1817821
1917722
2017722
2117623
2217623
2317623
2417524
2517524
2617524
2717425
2817425
2927325
3027226

Wind in September

Winds average 19 km/h in September, the windiest month of the year.

Across September, daily wind ranges from about 18 km/h on the calmest days to 19 km/h at its breeziest. It stays fairly steady from day to day.

0510152025151015202530
Wind speed (km/h)Feels
119light breeze
219light breeze
319light breeze
419light breeze
519light breeze
619light breeze
719light breeze
819light breeze
919light breeze
1019light breeze
1119light breeze
1219light breeze
1319light breeze
1419light breeze
1519light breeze
1619light breeze
1719light breeze
1819light breeze
1919light breeze
2019light breeze
2119light breeze
2219light breeze
2319light breeze
2418light breeze
2518light breeze
2618light breeze
2718light breeze
2818light breeze
2918light breeze
3018light breeze

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 5:25 AM to 5:10 AM, and sunset from 5:18 PM to 5:12 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
111.95:255:18
211.95:245:18
311.95:245:18
411.95:235:18
511.95:235:17
611.95:225:17
711.95:225:17
811.95:215:17
911.95:215:17
1011.95:205:16
1111.95:205:16
1211.95:195:16
1312.05:195:16
1412.05:185:16
1512.05:175:15
1612.05:175:15
1712.05:165:15
1812.05:165:15
1912.05:155:14
2012.05:155:14
2112.05:145:14
2212.05:145:14
2312.05:135:14
2412.05:135:13
2512.05:125:13
2612.05:125:13
2712.05:115:13
2812.05:115:13
2912.05:105:12
3012.05:105:12

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 6.03 kWh/m².

For context, solar energy here swings from a low near 4.51 kWh/m² to a high of 6.46 kWh/m² in November across the year — September's 6.03 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.7Bright
25.7Bright
35.7Bright
45.8Bright
55.8Bright
65.8Bright
75.8Bright
85.8Bright
95.9Bright
105.9Bright
115.9Bright
125.9Bright
135.9Bright
146.0Bright
156.0Bright
166.0Intense
176.0Intense
186.1Intense
196.1Intense
206.1Intense
216.1Intense
226.2Intense
236.2Intense
246.2Intense
256.3Intense
266.3Intense
276.3Intense
286.3Intense
296.3Intense
306.3Intense
Planning a trip in September

Hazard calendar for Ceará-Mirim

In seasonPeak

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

Ceará-Mirim's rainy season runs January–July, when most of the year's rain falls.

Rainy season
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is September a good time to visit Ceará-Mirim?

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

6.2
Sightseeing
2nd-best month of the year
8.2
Beach & pool
1st-best month of the year

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

What to pack for Ceará-Mirim in September

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

In September, Ceará-Mirim sees daytime highs around 29°C and nights near 22°C. Pack light clothes and sun protection. About 5 days see rain.

light clothessun protection

Sea temperature near Ceará-Mirim in September

The nearest coast averages about 26°C in September — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 29 km away) is warmest in March at about 29°C and coldest in August near 26°C.

The water stays above 20°C all year — warm enough for a swim any month.

24°26°28°30°JanFebMarAprMayJunJulAugSepOctNovDecwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan28Tropical
Feb29Tropical
Mar29Tropical
Apr29Tropical
May28Tropical
Jun27Warm
Jul27Warm
Aug26Warm
Sep26Warm
Oct27Warm
Nov27Warm
Dec28Warm

UV index in Ceará-Mirim 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 Ceará-Mirim peaks around March 15 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 12 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 15UV 15Jul 12UV 10
UV index (midday)Level
Jan13Extreme
Feb14Extreme
Mar15Extreme
Apr14Extreme
May11Extreme
Jun10Very high
Jul10Very high
Aug10Extreme
Sep12Extreme
Oct12Extreme
Nov12Extreme
Dec12Extreme
Location & terrain

Where is Ceará-Mirim?

Ceará-Mirim sits at 5.6°S, 35.4°W, 37 m above sea level, in Brazil. The nearest listed city is Extremoz, 15 km away.

Topography around Ceará-Mirim

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

Within 3 km, the terrain around Ceará-Mirim has only modest variations in elevation — a maximum elevation change of 78 m around an average of 35 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 129 m; within 80 km, significant variations in elevation — a maximum elevation change of 529 m.

The land around Ceará-Mirim is covered by grassland (58%) within 3 km, grassland (51%) and shrubs (31%) within 16 km, and shrubs (32%), water (32%) and grassland (29%) within 80 km.

3 km
78 m
16 km
129 m
80 km
529 m
treesshrubsgrasslandcroplandartificial surfaceswaterwetland
September weather nearby: Extremoz 15 km · São Gonçalo do Amarante 21 km · Macaíba 26 km · Natal 30 km · Parnamirim 36 km · João Câmara 45 km · São Paulo do Potengi 47 km · Touros 49 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 Ceará-Mirim (-5.6344°, -35.4256°, elevation 37 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. Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).