Avellaneda weather in September

In September, Avellaneda sees average daytime highs of 17°C and overnight lows near 11°C, with 74 mm of rain across 7.1 wet days and about 11.8 hours of daylight. It is the 9th-warmest and 8th-wettest month of the year here.

Highs climb over the month, from about 16°C in the first days to 18°C by the end. The sky is clear or mostly clear about 38% of the time in September, and the air most often feels dry.

Daylight stretches from about 11 h 12 min at the start of September to 12 h 18 min by month's end. Set against the rest of the year, September is Avellaneda's 8th-clearest and 1st-windiest month. For the whole year in context, see Avellaneda's year-round climate.

Daytime high
17°
9th warmest
Overnight low
11°
4th coldest
Rainfall
74 mm
7.1 wet days
Daylight
11 h 48 min
6:54 AM – 6:41 PM
Cloud cover
53%
8th clearest
Wind
17 km/h
1st windiest
Solar energy
4.5 kWh/m²
Travel score
6.0
out of 10

Avellaneda is city in the province of Buenos Aires, Argentina.

Density
6,442/km²
people per km²
Founded
1852

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 16°C in the first days to 18°C by the end.

A typical September day in Avellaneda reaches about 17°C in the afternoon and slips back to 11°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 13°C and 21°C. Set against its neighbours, September runs about 2°C warmer than August and about 3°C cooler than October.

10°15°20°25°151015202530
Avg high (°C)Avg low (°C)
11610
21610
31610
41610
51610
61610
71710
81710
91710
101710
111710
121710
131710
141710
151710
161711
171711
181711
191711
201711
211811
221811
231811
241811
251811
261811
271811
281812
291812
301812

Avellaneda weather by month

How September compares with the rest of the year at a glance. September is the 9th-warmest and 8th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan27° / 20°837.114.17.2
Feb26° / 20°927.813.37.2
Mar24° / 18°887.312.37.6
Apr21° / 15°947.911.27.0
May17° / 11°63610.26.1
Jun14° / 676.49.74.6
Jul13° / 676.89.94.1
Aug15° / 666.410.75.1
Sep17° / 11°747.111.86.0
Oct20° / 13°1099.312.96.5
Nov23° / 16°948.113.87.3
Dec26° / 18°81814.37.3

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 38% 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 48%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15050
25050
35050
45050
55149
65149
75149
85347
95347
105347
115446
125545
135545
145446
155446
165545
175446
185446
195446
205446
215446
225347
235347
245248
255248
265149
275149
285149
295149
305149

Chance of precipitation in September

Any precipitation

Avellaneda gets around 74 mm of rain over 7.1 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 24% and peaks near 27% on the wettest days.

0%10%20%30%40%151015202530
Rain chance (%)
125
225
326
426
525
625
725
825
924
1024
1123
1223
1322
1422
1522
1621
1721
1821
1921
2022
2122
2222
2323
2423
2524
2624
2725
2825
2926
3027

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the dry band about 80% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)
183134
283134
383134
483134
583134
683134
783134
882144
982144
1082144
1182144
1282144
1382144
1482144
1583134
1683134
1783134
1883134
1982144
2082144
2181154
2280164
2379174
2478184
2577194
2676204
2776204
2875214
2973225
3072235

Wind in September

Winds average 17 km/h in September, the windiest month of the year.

Across September, daily wind ranges from about 17 km/h on the calmest days to 17 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202530
Wind speed (km/h)Feels
117light breeze
217light breeze
317light breeze
417light breeze
517light breeze
617light breeze
717light breeze
817light breeze
917light breeze
1017light breeze
1117light breeze
1217light breeze
1317light breeze
1417light breeze
1517light breeze
1617light breeze
1717light breeze
1817light breeze
1917light breeze
2017light breeze
2117light breeze
2217light breeze
2317light breeze
2417light breeze
2517light breeze
2617light breeze
2717light breeze
2817light breeze
2917light breeze
3017light breeze

Sunrise & sunset in September

DaylightNight

Daylight runs from about 11 h 12 min at the start of September to 12 h 18 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 66 minutes over September. Sunrise moves from 7:16 AM to 6:34 AM, and sunset from 6:30 PM to 6:52 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
111.27:166:30
211.37:156:31
311.37:136:32
411.37:126:33
511.47:106:33
611.47:096:34
711.57:076:35
811.57:066:35
911.57:056:36
1011.67:036:37
1111.67:026:38
1211.67:006:38
1311.76:596:39
1411.76:576:40
1511.76:566:41
1611.86:546:41
1711.86:536:42
1811.96:516:43
1911.96:506:44
2011.96:486:44
2112.06:476:45
2212.06:456:46
2312.06:446:47
2412.16:426:47
2512.16:416:48
2612.26:396:49
2712.26:386:50
2812.26:366:50
2912.36:356:51
3012.36:346:52

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.5 kWh/m².

For context, solar energy here swings from a low near 2.25 kWh/m² to a high of 7.5 kWh/m² in December across the year — September's 4.5 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
13.8Moderate
23.9Moderate
33.9Moderate
44.0Moderate
54.0Bright
64.1Bright
74.1Bright
84.2Bright
94.2Bright
104.3Bright
114.3Bright
124.4Bright
134.4Bright
144.5Bright
154.5Bright
164.6Bright
174.6Bright
184.7Bright
194.7Bright
204.7Bright
214.8Bright
224.8Bright
234.8Bright
244.8Bright
254.9Bright
264.9Bright
274.9Bright
284.9Bright
295.0Bright
305.0Bright
Planning a trip in September

Is September a good time to visit Avellaneda?

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

6.0
Sightseeing
9th-best month of the year
1.5
Beach & pool
9th-best month of the year

September is a reasonable time to visit Avellaneda for sightseeing.

What to pack for Avellaneda in September

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

In September, Avellaneda sees daytime highs around 17°C and nights near 11°C. Worth packing: sun protection. About 7 days see rain.

sun protection

Sea temperature near Avellaneda in September

The nearest coast averages about 15°C in September — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea offshore is warmest in January at about 25°C and coldest in July near 13°C.

It's comfortable for a long swim from Nov 9 to Apr 20 — about 5.4 months when the water holds above 20°C.

10°15°20°25°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmcomfortable to swimcomfortable to swim
Sea temperature (°C)Comfort
Jan25Warm
Feb25Warm
Mar23Refreshing
Apr21Refreshing
May17Cool
Jun14Bracing
Jul13Bracing
Aug13Bracing
Sep15Cool
Oct18Cool
Nov21Refreshing
Dec23Refreshing

UV index in Avellaneda in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 6 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Avellaneda peaks around January 14 at about 12 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 19 at about 3 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 10 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highModerateHighVery highExtremeJan 14UV 12Jun 19UV 3
UV index (midday)Level
Jan13Extreme
Feb11Extreme
Mar10Very high
Apr6High
May3Moderate
Jun3Moderate
Jul3Moderate
Aug4Moderate
Sep6High
Oct8Very high
Nov11Extreme
Dec12Extreme

Air quality in Avellaneda 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 Avellaneda is worst in June — around 25 µg/m³ PM2.5 (moderate), about 2.0× the cleanest month (December, 12 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateJun 2325 µg/m³Dec 1612 µg/m³
PM2.5 (µg/m³)Level
Jan13Moderate
Feb14Moderate
Mar16Moderate
Apr17Moderate
May22Moderate
Jun25Moderate
Jul25Moderate
Aug24Moderate
Sep19Moderate
Oct16Moderate
Nov13Moderate
Dec12Moderate
Location & terrain

Where is Avellaneda?

Avellaneda sits at 34.7°S, 58.4°W, 13 m above sea level, in Argentina. The nearest listed city is Barracas, 2.0 km away.

Topography around Avellaneda

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

Within 3 km, the terrain around Avellaneda has only modest variations in elevation — a maximum elevation change of 28 m around an average of 7 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 57 m; within 80 km, only modest variations in elevation — a maximum elevation change of 138 m.

The land around Avellaneda is covered by artificial surfaces (87%) within 3 km, artificial surfaces (58%) and water (32%) within 16 km, and grassland (29%), water (25%) and cropland (21%) within 80 km.

3 km
28 m
16 km
57 m
80 km
138 m
treesgrasslandcroplandartificial surfaceswaterwetland
September weather nearby: Barracas 2.0 km · Sarandí 3.0 km · Valentín Alsina 4.0 km · Buenos Aires 5.0 km · Boedo 5.0 km · Lanús 6.0 km · Balvanera 6.0 km · Remedios de Escalada de San Martín 8.0 km

Argentina travel facts

Travel advisory
Level 1
Exercise Normal Precautions
Power plugs
Type C / I
220 V · 50 Hz
Prices
≈ 46% of US
price level, 2025
GDP per capita
$14,898
2025
Happiness
6.4 / 10
World Happiness, 2025
Homicide rate
4.5
per 100k, 2023
Road deaths
14.1
per 100k/yr, 2019
Income group
Upper middle
World Bank
English
High
EF EPI 575
Religion
Roman Catholic 63%none 19%Evangelical 15%Jehovah's Witness and Church of Jesus Christ 1%

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 Avellaneda (-34.6602°, -58.3674°, elevation 13 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).