Eirunepé weather in September

In September, Eirunepé sees average daytime highs of 31°C and overnight lows near 23°C, with 122 mm of rain across 19.1 wet days and about 12 hours of daylight. It is the 1st-warmest and 9th-wettest month of the year here.

Day-to-day highs hold fairly steady near 31°C through the month. The sky is clear or mostly clear about 17% of the time in September, and the air most often feels oppressive.

Daylight stretches from about 11 h 54 min at the start of September to 12 h 06 min by month's end. Set against the rest of the year, September is Eirunepé's 4th-clearest and 1st-windiest month. For the whole year in context, see Eirunepé's year-round climate.

Daytime high
31°
1st warmest
Overnight low
23°
5th coldest
Rainfall
122 mm
19.1 wet days
Daylight
12 hours
5:35 AM – 5:33 PM
Cloud cover
66%
4th clearest
Wind
5 km/h
1st windiest
Solar energy
5.35 kWh/m²
Travel score
3.3
out of 10

Eirunepé 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 31°C through the month.

A typical September day in Eirunepé reaches about 31°C in the afternoon and slips back to 23°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 29°C and 34°C. Set against its neighbours, September runs on par with August and on par with October.

20°25°30°35°151015202530
Avg high (°C)Avg low (°C)
13122
23122
33122
43122
53122
63122
73123
83123
93123
103123
113123
123123
133123
143123
153123
163123
173123
183123
193123
203123
213123
223123
233123
243123
253123
263123
273123
283123
293123
303123

How September really feels in Eirunepé

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.

Eirunepé weather by month

How September compares with the rest of the year at a glance. September is the 1st-warmest and 9th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan30° / 23°28328.312.32.8
Feb30° / 23°27325.512.22.7
Mar30° / 23°30128.4122.7
Apr30° / 23°24625.811.92.9
May30° / 23°16723.811.73.4
Jun29° / 22°9617.911.64.2
Jul30° / 21°6713.411.74.8
Aug31° / 22°8514.511.84.2
Sep31° / 23°12219.1123.3
Oct31° / 23°17423.212.13.0
Nov31° / 23°22425.412.32.7
Dec30° / 23°26127.912.42.7

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 17% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 20% of September, with mostly cloudy or overcast conditions the remaining 62%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14852
24753
34654
44555
54555
64357
74357
84357
94258
104258
114159
124159
134060
144060
153961
163862
173862
183763
193664
203565
213466
223466
233268
243268
253169
263070
272971
282872
292872
302773

Chance of precipitation in September

Any precipitation

Eirunepé gets around 122 mm of rain over 19.1 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 64% and peaks near 70% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%80%151015202530
Rain chance (%)
158
259
359
459
560
660
760
860
961
1061
1161
1261
1361
1462
1562
1663
1764
1864
1965
2066
2166
2266
2367
2467
2568
2668
2769
2869
2970
3070

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the oppressive band about 55% of days. Sticky, muggy-or-worse air turns up on roughly 99% of them.

0%25%50%75%100%151015202530
Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1256231
2256231
3246232
4246232
5246232
6246133
7246034
8245935
9245935
10136036
11135937
12135739
13135640
14135541
15135442
16135343
17135343
18135244
19135145
20135145
21035146
22035146
23035146
24035047
25025147
26025147
27025147
28025147
29025048
30025048

Wind in September

Winds average 5 km/h in September, the windiest month of the year.

Across September, daily wind ranges from about 5 km/h on the calmest days to 5 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (km/h)Feels
15calm
25calm
35calm
45calm
55calm
65calm
75calm
85calm
95calm
105calm
115calm
125calm
135calm
145calm
155calm
165calm
175calm
185calm
195calm
205calm
215calm
225calm
235calm
245calm
255calm
265calm
275calm
285calm
295calm
305calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 11 h 54 min at the start of September to 12 h 06 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 12 minutes over September. Sunrise moves from 5:43 AM to 5:27 AM, and sunset from 5:35 PM to 5:30 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
111.95:435:35
211.95:435:35
311.95:425:35
411.95:415:35
511.95:415:35
611.95:405:35
711.95:405:34
811.95:395:34
911.95:395:34
1011.95:385:34
1111.95:385:34
1211.95:375:33
1311.95:375:33
1412.05:365:33
1512.05:355:33
1612.05:355:33
1712.05:345:33
1812.05:345:32
1912.05:335:32
2012.05:335:32
2112.05:325:32
2212.05:325:32
2312.05:315:31
2412.05:305:31
2512.05:305:31
2612.05:295:31
2712.05:295:31
2812.05:285:31
2912.05:285:31
3012.15:275:30

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.35 kWh/m² — the sunniest month for solar.

For context, solar energy here swings from a low near 4.08 kWh/m² to a high of 5.35 kWh/m² in September across the year — September's 5.35 kWh/m² sits near the top of that range.

0246151015202530
Solar energy (kWh/m²)Level
15.3Bright
25.3Bright
35.3Bright
45.3Bright
55.3Bright
65.3Bright
75.3Bright
85.3Bright
95.3Bright
105.3Bright
115.3Bright
125.3Bright
135.3Bright
145.3Bright
155.3Bright
165.4Bright
175.4Bright
185.4Bright
195.4Bright
205.4Bright
215.4Bright
225.4Bright
235.4Bright
245.4Bright
255.4Bright
265.4Bright
275.4Bright
285.4Bright
295.4Bright
305.4Bright
Planning a trip in September

Is September a good time to visit Eirunepé?

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

3.3
Sightseeing
5th-best month of the year
5.1
Beach & pool
4th-best month of the year

September is a weaker month for outdoor sightseeing in Eirunepé.

What to pack for Eirunepé in September

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

In September, Eirunepé sees daytime highs around 31°C and nights near 23°C. Pack light clothes and rain gear. Worth having: sun protection. About 19 days see rain.

light clothesrain gearsun protection

UV index in Eirunepé in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 9 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Eirunepé peaks around February 16 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near August 18 at about 8 (very high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highExtremeFeb 16UV 15Aug 18UV 8
UV index (midday)Level
Jan15Extreme
Feb16Extreme
Mar15Extreme
Apr13Extreme
May12Extreme
Jun10Very high
Jul9Very high
Aug8Very high
Sep9Very high
Oct12Extreme
Nov13Extreme
Dec12Extreme

Air quality in Eirunepé 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 Eirunepé is worst in September — around 26 µg/m³ PM2.5 (moderate), about 3.5× the cleanest month (June, 7 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodModerateGoodSep 1225 µg/m³Jun 127 µg/m³
PM2.5 (µg/m³)Level
Jan12Moderate
Feb13Moderate
Mar13Moderate
Apr10Good
May8Good
Jun7Good
Jul10Good
Aug22Moderate
Sep26Moderate
Oct11Good
Nov11Good
Dec10Good
Location & terrain

Where is Eirunepé?

Eirunepé sits at 6.7°S, 69.9°W, 123 m above sea level, in Brazil. The nearest listed city is Feijó, 176 km away.

Benjamin ConstantAtalaia do NorteTabatingaLeticiaSena Madureira

Topography around Eirunepé

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

Within 3 km, the terrain around Eirunepé has only modest variations in elevation — a maximum elevation change of 40 m around an average of 122 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 128 m; within 80 km, only modest variations in elevation — a maximum elevation change of 149 m.

The land around Eirunepé is covered by grassland (46%) and trees (42%) within 3 km, trees (86%) within 16 km, and trees (98%) within 80 km.

3 km
40 m
16 km
128 m
80 km
149 m
treesgrasslandartificial surfaceswater
September weather nearby: Feijó 176 km · Tarauacá 194 km · Ipixuna 206 km · Benjamin Constant 255 km · Atalaia do Norte 257 km · Tabatinga 270 km · Leticia 272 km · Sena Madureira 298 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 Eirunepé (-6.6603°, -69.8736°, elevation 123 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).