Russas weather in September

In September, Russas sees average daytime highs of 35°C and overnight lows near 23°C, with 1 mm of rain across 0.2 wet days and about 12 hours of daylight. It is the 2nd-warmest and 12th-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 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 Russas's 1st-clearest and 2nd-windiest month. For the whole year in context, see Russas's year-round climate.

Daytime high
35°
2nd warmest
Overnight low
23°
4th coldest
Rainfall
1 mm
0.2 wet days
Daylight
12 hours
5:27 AM – 5:25 PM
Cloud cover
30%
1st clearest
Wind
18 km/h
2nd windiest
Solar energy
6.72 kWh/m²
Travel score
3.2
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 Russas reaches about 35°C in the afternoon and slips back to 23°C overnight — a 12°C spread between the day's warmth and the night's chill. On most days the high lands between 34°C and 36°C. Set against its neighbours, September runs on par with August and on par with 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
173523
183523
193523
203523
213523
223523
233523
243523
253523
263523
273523
283523
293523
303523

How September really feels in Russas

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.

Russas weather by month

How September compares with the rest of the year at a glance. September is the 2nd-warmest and 12th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan34° / 24°7411.712.33.0
Feb33° / 24°941412.23.0
Mar32° / 24°16119.3123.0
Apr32° / 24°15217.611.93.3
May32° / 24°7110.411.83.8
Jun33° / 23°296.411.74.1
Jul33° / 23°18311.74.1
Aug34° / 23°30.611.83.6
Sep35° / 23°10.2123.2
Oct35° / 24°30.312.13.1
Nov35° / 24°30.412.23.2
Dec35° / 25°163.412.33.1

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 72% of the time in September, the clearest month of the year.

Beyond those clear spells, partly cloudy skies cover about 18% of September, with mostly cloudy or overcast conditions the remaining 10%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
18812
28812
38713
48713
58812
68812
78812
88812
98812
108812
118911
128911
138911
149010
15919
16919
17919
18928
19937
20937
21937
22937
23937
24937
25937
26937
27937
28937
29919
30919

Chance of precipitation in September

Any precipitation

Russas gets around 1 mm of rain over 0.2 wet days in September, the driest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 1% and peaks near 1% 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
181
191
201
211
221
231
241
250
260
270
280
290
300

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 64% of days. Sticky, muggy-or-worse air turns up on roughly 67% of them.

0%25%50%75%100%151015202530
Humid (%)Muggy (%)Oppressive (%)
143552
243552
343552
443552
544542
643552
743552
842562
942562
1040582
1139592
1238602
1337612
1436622
1534633
1633643
1732653
1830673
1929683
2028684
2127694
2225714
2324724
2423725
2523725
2622735
2721745
2820755
2919756
3018766

Wind in September

Winds average 18 km/h in September.

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

0510152025151015202530
Wind speed (km/h)Feels
118light breeze
218light breeze
318light breeze
418light breeze
518light breeze
618light breeze
718light breeze
818light breeze
918light breeze
1018light breeze
1118light breeze
1218light breeze
1318light breeze
1418light breeze
1518light breeze
1618light breeze
1718light breeze
1818light breeze
1918light breeze
2018light breeze
2118light breeze
2218light breeze
2318light 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 5:34 AM to 5:20 AM, and sunset from 5:29 PM to 5:22 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
111.95:345:29
211.95:345:29
311.95:345:28
411.95:335:28
511.95:335:28
611.95:325:28
711.95:325:27
811.95:315:27
911.95:315:27
1011.95:305:27
1112.05:305:27
1212.05:295:26
1312.05:295:26
1412.05:285:26
1512.05:285:26
1612.05:275:25
1712.05:275:25
1812.05:265:25
1912.05:255:25
2012.05:255:24
2112.05:245:24
2212.05:245:24
2312.05:235:24
2412.05:235:24
2512.05:225:23
2612.05:225:23
2712.05:215:23
2812.05:215:23
2912.05:215:23
3012.05:205:22

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 6.72 kWh/m².

For context, solar energy here swings from a low near 4.91 kWh/m² to a high of 6.86 kWh/m² in October across the year — September's 6.72 kWh/m² sits near the top of that range.

0246151015202530
Solar energy (kWh/m²)Level
16.4Intense
26.4Intense
36.5Intense
46.5Intense
56.5Intense
66.5Intense
76.5Intense
86.5Intense
96.6Intense
106.6Intense
116.6Intense
126.6Intense
136.7Intense
146.7Intense
156.7Intense
166.7Intense
176.7Intense
186.8Intense
196.8Intense
206.8Intense
216.8Intense
226.8Intense
236.9Intense
246.9Intense
256.9Intense
266.9Intense
276.9Intense
286.9Intense
297.0Intense
307.0Intense
Planning a trip in September

Hazard calendar for Russas

In seasonPeak

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

Russas's rainy season runs January–April, 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 Russas?

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

3.2
Sightseeing
6th-best month of the year
6.9
Beach & pool
3rd-best month of the year

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

What to pack for Russas in September

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

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

light clothessun protection

Sea temperature near Russas in September

The nearest coast averages about 27°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 52 km away) is warmest in April at about 29°C and coldest in August near 27°C.

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

26°28°30°JanFebMarAprMayJunJulAugSepOctNovDecwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan28Tropical
Feb29Tropical
Mar29Tropical
Apr29Tropical
May29Tropical
Jun28Warm
Jul27Warm
Aug27Warm
Sep27Warm
Oct27Warm
Nov28Warm
Dec28Tropical

UV index in Russas 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 Russas peaks around March 15 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 23 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 15Jun 23UV 10
UV index (midday)Level
Jan13Extreme
Feb14Extreme
Mar15Extreme
Apr14Extreme
May11Extreme
Jun10Very high
Jul10Very high
Aug10Extreme
Sep12Extreme
Oct12Extreme
Nov12Extreme
Dec11Extreme

Air quality in Russas 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 Russas is worst in November — around 16 µg/m³ PM2.5 (moderate), about 3.5× the cleanest month (July, 5 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateNov 1516 µg/m³Jul 175 µg/m³
PM2.5 (µg/m³)Level
Jan11Good
Feb10Good
Mar10Good
Apr10Good
May7Good
Jun5Good
Jul5Good
Aug5Good
Sep7Good
Oct15Moderate
Nov16Moderate
Dec14Moderate
Location & terrain

Where is Russas?

Russas sits at 4.9°S, 38.0°W, 26 m above sea level, in Brazil. The nearest listed city is Quixeré, 15 km away.

Topography around Russas

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

Within 3 km, the terrain around Russas has only modest variations in elevation — a maximum elevation change of 57 m around an average of 27 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 158 m; within 80 km, significant variations in elevation — a maximum elevation change of 407 m.

The land around Russas is covered by grassland (45%), cropland (24%) and artificial surfaces (20%) within 3 km, grassland (45%) and shrubs (39%) within 16 km, and shrubs (53%) and grassland (24%) within 80 km.

3 km
57 m
16 km
158 m
80 km
407 m
treesshrubsgrasslandcroplandartificial surfacesbare terrainwaterwetland
September weather nearby: Quixeré 15 km · Jaguaruana 25 km · Limoeiro do Norte 27 km · Tabuleiro do Norte 38 km · Baraúna 43 km · Morada Nova 48 km · Aracati 48 km · Fortim 58 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 Russas (-4.9403°, -37.9758°, elevation 26 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. 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).