La Plata weather in September

In September, La Plata sees average daytime highs of 18°C and overnight lows near 9°C, with 72 mm of rain across 6.9 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 36% 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 La Plata's 8th-clearest and 1st-windiest month. For the whole year in context, see La Plata's year-round climate.

Daytime high
18°
9th warmest
Overnight low
4th coldest
Rainfall
72 mm
6.9 wet days
Daylight
11 h 48 min
6:53 AM – 6:40 PM
Cloud cover
55%
8th clearest
Wind
15 km/h
1st windiest
Solar energy
4.53 kWh/m²
Travel score
6.3
out of 10

La Plata is capital of the Buenos Aires province, Argentina.

Density
7,239/km²
people per km²
Founded
1882

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 La Plata 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 22°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)
1179
2179
3179
4179
5179
6179
7179
8179
9179
10179
11189
12189
13189
14189
15189
16189
17189
18189
19189
20189
21189
221810
231810
241910
251910
261910
271910
281910
291910
301910

La Plata 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° / 19°92814.16.3
Feb27° / 18°868.713.36.7
Mar25° / 16°847.612.37.4
Apr22° / 13°867.611.17.1
May18° / 10°606.110.26.3
Jun15° / 6269.74.9
Jul14° / 646.39.94.5
Aug16° / 686.210.75.5
Sep18° / 726.911.86.3
Oct21° / 12°1029.612.96.6
Nov24° / 14°938.613.87.2
Dec27° / 17°828.514.36.9

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 36% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 13% of September, with mostly cloudy or overcast conditions the remaining 51%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14753
24753
34753
44753
54753
64852
74951
84951
95050
105050
115050
125149
135149
145149
155149
165248
175248
185149
195149
205149
215050
224951
234951
244951
254852
264852
274753
284852
294852
304852

Chance of precipitation in September

Any precipitation

La Plata gets around 72 mm of rain over 6.9 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 (%)
124
224
324
424
524
624
724
823
923
1023
1122
1222
1322
1421
1521
1621
1721
1821
1921
2021
2122
2222
2323
2423
2523
2624
2724
2825
2925
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 84% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
1861130
2861130
3861130
4861130
5861130
6861130
7861130
8861130
9861130
10851131
11851131
12841141
13841141
14851041
15851041
16851041
17851041
18851041
19861040
20861130
21861130
22851230
23841330
24841330
25831430
26821530
27811630
28801730
29791740
30781840

Wind in September

Winds average 15 km/h in September, the windiest month of the year.

Across September, daily wind ranges from about 15 km/h on the calmest days to 15 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202530
Wind speed (km/h)Feels
115light breeze
215light breeze
315light breeze
415light breeze
515light breeze
615light breeze
715light breeze
815light breeze
915light breeze
1015light breeze
1115light breeze
1215light breeze
1315light breeze
1415light breeze
1515light breeze
1615light breeze
1715light breeze
1815light breeze
1915light breeze
2015light breeze
2115light breeze
2215light breeze
2315light breeze
2415light breeze
2515light breeze
2615light breeze
2715light breeze
2815light breeze
2915light breeze
3015light 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 6:50 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
111.27:156:28
211.37:136:29
311.37:126:30
411.37:106:31
511.47:096:31
611.47:076:32
711.47:066:33
811.57:056:34
911.57:036:34
1011.67:026:35
1111.67:006:36
1211.66:596:37
1311.76:576:37
1411.76:566:38
1511.76:546:39
1611.86:536:40
1711.86:516:40
1811.96:506:41
1911.96:486:42
2011.96:476:43
2112.06:456:43
2212.06:446:44
2312.06:426:45
2412.16:416:46
2512.16:396:47
2612.26:386:47
2712.26:366:48
2812.26:356:49
2912.36:336:50
3012.36:326:50

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.53 kWh/m².

For context, solar energy here swings from a low near 2.27 kWh/m² to a high of 7.59 kWh/m² in December across the year — September's 4.53 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
13.9Moderate
23.9Moderate
33.9Moderate
44.0Moderate
54.0Bright
64.1Bright
74.1Bright
84.2Bright
94.3Bright
104.3Bright
114.3Bright
124.4Bright
134.5Bright
144.5Bright
154.5Bright
164.6Bright
174.6Bright
184.7Bright
194.7Bright
204.8Bright
214.8Bright
224.8Bright
234.8Bright
244.9Bright
254.9Bright
264.9Bright
275.0Bright
285.0Bright
295.0Bright
305.0Bright
Planning a trip in September

Is September a good time to visit La Plata?

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

6.3
Sightseeing
7th-best month of the year
2.1
Beach & pool
9th-best month of the year

September is a reasonable time to visit La Plata for sightseeing.

What to pack for La Plata in September

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

In September, La Plata sees daytime highs around 18°C and nights near 9°C. Worth packing: sun protection. About 7 days see rain.

sun protection

Sea temperature near La Plata 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 12°C.

It's comfortable for a long swim from Nov 10 to Apr 15 — about 5.2 months when the water holds above 20°C.

10°15°20°25°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmcomfortable to swimcomfortable to swim
Sea temperature (°C)Comfort
Jan25Warm
Feb25Warm
Mar23Refreshing
Apr20Refreshing
May17Cool
Jun13Bracing
Jul12Bracing
Aug13Bracing
Sep15Bracing
Oct18Cool
Nov21Refreshing
Dec23Refreshing

UV index in La Plata 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 La Plata peaks around January 15 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 15UV 12Jun 19UV 3
UV index (midday)Level
Jan13Extreme
Feb11Extreme
Mar10Very high
Apr6High
May3Moderate
Jun3Moderate
Jul3Moderate
Aug4Moderate
Sep6High
Oct8Very high
Nov11Extreme
Dec12Extreme
Location & terrain

Where is La Plata?

La Plata sits at 34.9°S, 58.0°W, 27 m above sea level, in Argentina. The nearest listed city is Ensenada, 8.0 km away.

Topography around La Plata

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

Within 3 km, the terrain around La Plata has only modest variations in elevation — a maximum elevation change of 28 m around an average of 18 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 52 m; within 80 km, only modest variations in elevation — a maximum elevation change of 116 m.

The land around La Plata is covered by artificial surfaces (85%) within 3 km, grassland (47%) within 16 km, and water (36%), grassland (33%) and cropland (20%) within 80 km.

3 km
28 m
16 km
52 m
80 km
116 m
treesgrasslandcroplandartificial surfaceswaterwetland
September weather nearby: Ensenada 8.0 km · Berisso 9.0 km · Berazategui 29 km · Quilmes 35 km · Coronel Brandsen 38 km · Adrogué 41 km · Burzaco 42 km · Monte Chingolo 42 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 La Plata (-34.9213°, -57.9544°, elevation 27 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).