Chascomús weather in September

In September, Chascomús sees average daytime highs of 18°C and overnight lows near 9°C, with 72 mm of rain across 7 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 17°C in the first days to 19°C by the end. The sky is clear or mostly clear about 34% 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 Chascomús's 8th-clearest and 2nd-windiest month. For the whole year in context, see Chascomús's year-round climate.

Daytime high
18°
9th warmest
Overnight low
4th coldest
Rainfall
72 mm
7 wet days
Daylight
11 h 48 min
6:53 AM – 6:40 PM
Cloud cover
57%
8th clearest
Wind
14 km/h
2nd windiest
Solar energy
4.32 kWh/m²
Travel score
6.2
out of 10

Chascomús is city in Argentina.

Founded
1779

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 17°C in the first days to 19°C by the end.

A typical September day in Chascomús reaches about 18°C in the afternoon and slips back to 9°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 13°C and 23°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)
1178
2178
3178
4178
5178
6178
7178
8178
9178
10178
11188
12188
13188
14188
15188
16188
17188
18188
19189
20189
21189
22189
23189
24189
25199
26199
27199
28199
29199
301910

Chascomús 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
Jan28° / 18°888.114.16.3
Feb27° / 17°918.213.36.8
Mar25° / 16°857.712.37.4
Apr22° / 12°877.311.17.2
May18° / 57610.16.3
Jun15° / 655.79.64.9
Jul14° / 616.39.84.4
Aug16° / 656.410.75.5
Sep18° / 72711.86.2
Oct21° / 11°1019.112.96.6
Nov24° / 14°888.313.97.2
Dec27° / 16°818.714.46.9

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 34% 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 52%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14654
24753
34753
44753
54852
64753
74852
84951
94951
104852
114951
124852
134951
144951
154951
164951
174951
184852
194852
204852
214951
224852
234753
244753
254753
264654
274654
284753
294555
304654

Chance of precipitation in September

Any precipitation

Chascomús gets around 72 mm of rain over 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 26% on the wettest days.

0%10%20%30%40%151015202530
Rain chance (%)
123
223
323
423
523
623
723
823
922
1022
1122
1222
1322
1422
1522
1622
1722
1822
1922
2023
2123
2224
2324
2424
2525
2625
2725
2825
2926
3026

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 87% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
189920
289920
389920
490820
590820
690820
789920
889920
989920
1088921
11871021
12871021
13871021
14871021
15881020
16881020
17881020
18881020
19871120
20871120
21871120
22871120
23861220
24861220
25851320
26851320
27851320
28831430
29831430
30821530

Wind in September

Winds average 14 km/h in September.

Across September, daily wind ranges from about 14 km/h on the calmest days to 14 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202530
Wind speed (km/h)Feels
114light breeze
214light breeze
314light breeze
414light breeze
514light breeze
614light breeze
714light breeze
814light breeze
914light breeze
1014light breeze
1114light breeze
1214light breeze
1314light breeze
1414light breeze
1514light breeze
1614light breeze
1714light breeze
1814light breeze
1914light breeze
2014light breeze
2114light breeze
2214light breeze
2314light breeze
2414light breeze
2514light breeze
2614light breeze
2714light breeze
2814light breeze
2914light breeze
3014light 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 7:15 AM to 6:32 AM, and sunset from 6:28 PM to 6:51 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
111.27:156:28
211.27:146:29
311.37:136:30
411.37:116:30
511.47:106:31
611.47:086:32
711.47:076:33
811.57:056:34
911.57:046:34
1011.57:026:35
1111.67:016:36
1211.66:596:37
1311.76:586:37
1411.76:566:38
1511.76:556:39
1611.86:536:40
1711.86:516:41
1811.96:506:41
1911.96:486:42
2011.96:476:43
2112.06:456:44
2212.06:446:44
2312.06:426:45
2412.16:416:46
2512.16:396:47
2612.26:386:48
2712.26:366:48
2812.26:356:49
2912.36:336:50
3012.36:326:51

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.32 kWh/m².

For context, solar energy here swings from a low near 2.16 kWh/m² to a high of 7.37 kWh/m² in December across the year — September's 4.32 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
13.7Moderate
23.7Moderate
33.8Moderate
43.8Moderate
53.9Moderate
63.9Moderate
74.0Moderate
84.0Bright
94.1Bright
104.1Bright
114.2Bright
124.2Bright
134.3Bright
144.3Bright
154.3Bright
164.4Bright
174.4Bright
184.5Bright
194.5Bright
204.5Bright
214.5Bright
224.6Bright
234.6Bright
244.6Bright
254.7Bright
264.7Bright
274.7Bright
284.7Bright
294.8Bright
304.8Bright
Planning a trip in September

Is September a good time to visit Chascomús?

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

6.2
Sightseeing
9th-best month of the year
2.0
Beach & pool
9th-best month of the year

September is a reasonable time to visit Chascomús for sightseeing.

What to pack for Chascomús in September

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

In September, Chascomús sees daytime highs around 18°C and nights near 9°C. Little to plan around — just the basics. About 7 days see rain.

Sea temperature near Chascomús in September

The nearest coast averages about 13°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 66 km away) is warmest in January at about 23°C and coldest in July near 11°C.

It's comfortable for a long swim from Nov 28 to Apr 4 — about 4.2 months when the water holds above 20°C.

10°15°20°25°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmcomfortable to swim
Sea temperature (°C)Comfort
Jan23Refreshing
Feb23Refreshing
Mar22Refreshing
Apr19Cool
May16Cool
Jun13Bracing
Jul11Bracing
Aug11Bracing
Sep13Bracing
Oct16Cool
Nov19Cool
Dec22Refreshing

UV index in Chascomús 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 Chascomús peaks around January 14 at about 12 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 20 at about 2 (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 20UV 2
UV index (midday)Level
Jan12Extreme
Feb11Extreme
Mar10Very high
Apr6High
May3Moderate
Jun2Moderate
Jul3Moderate
Aug4Moderate
Sep6High
Oct7Very high
Nov11Extreme
Dec12Extreme
Location & terrain

Where is Chascomús?

Chascomús sits at 35.6°S, 58.0°W, 19 m above sea level, in Argentina. The nearest listed city is General Belgrano, 48 km away.

Topography around Chascomús

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

Within 3 km, the terrain around Chascomús has only modest variations in elevation — a maximum elevation change of 23 m around an average of 9 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 33 m; within 80 km, only modest variations in elevation — a maximum elevation change of 56 m.

The land around Chascomús is covered by water (46%) and artificial surfaces (23%) within 3 km, grassland (49%) and cropland (36%) within 16 km, and grassland (58%) and cropland (31%) within 80 km.

3 km
23 m
16 km
33 m
80 km
56 m
treesgrasslandcroplandartificial surfaceswaterwetland
September weather nearby: General Belgrano 48 km · Coronel Brandsen 50 km · Magdalena 71 km · San Vicente 72 km · La Plata 73 km · San Miguel del Monte 74 km · Berisso 79 km · Ensenada 80 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 Chascomús (-35.5768°, -58.0121°, elevation 19 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).