San Pedro weather in September

In September, San Pedro sees average daytime highs of 20°C and overnight lows near 9°C, with 68 mm of rain across 6.3 wet days and about 11.8 hours of daylight. It is the 8th-warmest and 8th-wettest month of the year here.

Highs climb over the month, from about 19°C in the first days to 21°C by the end. The sky is clear or mostly clear about 44% of the time in September, and the air most often feels dry.

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

Daytime high
20°
8th warmest
Overnight low
4th coldest
Rainfall
68 mm
6.3 wet days
Daylight
11 h 48 min
6:59 AM – 6:47 PM
Cloud cover
49%
8th clearest
Wind
13 km/h
1st windiest
Solar energy
4.64 kWh/m²
Travel score
7.0
out of 10

San Pedro is city in the province of Buenos Aires in Argentina.

Founded
1907

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 19°C in the first days to 21°C by the end.

A typical September day in San Pedro reaches about 20°C in the afternoon and slips back to 9°C overnight — a 11°C spread between the day's warmth and the night's chill. On most days the high lands between 15°C and 26°C. Set against its neighbours, September runs about 2°C warmer than August and about 3°C cooler than October.

10°20°30°151015202530
Avg high (°C)Avg low (°C)
1199
2199
3199
4199
5199
6199
7199
8209
9209
10209
11209
12209
13209
14209
15209
16209
17209
18209
19209
202010
212110
222110
232110
242110
252110
262110
272110
282110
292110
302111

San Pedro weather by month

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

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan30° / 19°978.1145.5
Feb29° / 18°1118.313.36.0
Mar27° / 16°1057.412.37.2
Apr23° / 13°1038.211.27.3
May19° / 10°68610.36.7
Jun16° / 485.59.85.6
Jul15° / 485.6105.3
Aug18° / 625.510.76.5
Sep20° / 686.311.87.0
Oct23° / 12°1229.712.87.0
Nov26° / 15°1057.813.77.2
Dec29° / 17°104914.26.1

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 44% 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 43%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15446
25545
35545
45545
55644
65644
75842
85842
95941
106040
116139
126139
136139
146139
156139
166040
176040
186040
195941
205842
215743
225743
235644
245545
255446
265446
275446
285248
295248
305248

Chance of precipitation in September

Any precipitation

San Pedro gets around 68 mm of rain over 6.3 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 21% and peaks near 26% on the wettest days.

0%10%20%30%40%151015202530
Rain chance (%)
123
223
323
423
522
622
721
821
921
1020
1120
1219
1319
1419
1519
1618
1719
1819
1919
2019
2120
2221
2321
2422
2523
2624
2724
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 83% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
1811351
2811351
3821251
4831250
5841150
6841150
7841150
8851050
9851050
10851050
11851050
12841051
13841051
14841051
15841051
16851041
17851041
18851041
19851041
20841141
21841141
22831241
23831241
24811351
25801451
26801451
27791551
28781561
29781660
30771670

Wind in September

Winds average 13 km/h in September, the windiest month of the year.

Across September, daily wind ranges from about 13 km/h on the calmest days to 13 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202530
Wind speed (km/h)Feels
113light breeze
213light breeze
313light breeze
413light breeze
513light breeze
613light breeze
713light breeze
813light breeze
913light breeze
1013light breeze
1113light breeze
1213light breeze
1313light breeze
1413light breeze
1513light breeze
1613light breeze
1713light breeze
1813light breeze
1913light breeze
2013light breeze
2113light breeze
2213light breeze
2313light breeze
2413light breeze
2513light breeze
2613light breeze
2713light breeze
2813light breeze
2913light breeze
3013light breeze

Sunrise & sunset in September

DaylightNight

Daylight runs from about 11 h 18 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 60 minutes over September. Sunrise moves from 7:20 AM to 6:39 AM, and sunset from 6:36 PM to 6:57 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
111.37:206:36
211.37:196:37
311.37:186:38
411.47:166:38
511.47:156:39
611.47:136:40
711.57:126:41
811.57:116:41
911.57:096:42
1011.67:086:43
1111.67:066:43
1211.77:056:44
1311.77:036:45
1411.77:026:45
1511.87:016:46
1611.86:596:47
1711.86:586:48
1811.96:566:48
1911.96:556:49
2011.96:536:50
2112.06:526:50
2212.06:516:51
2312.06:496:52
2412.16:486:52
2512.16:466:53
2612.26:456:54
2712.26:436:55
2812.26:426:55
2912.36:416:56
3012.36:396:57

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.64 kWh/m².

For context, solar energy here swings from a low near 2.32 kWh/m² to a high of 7.37 kWh/m² in December across the year — September's 4.64 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
14.0Bright
24.0Bright
34.1Bright
44.1Bright
54.2Bright
64.2Bright
74.3Bright
84.3Bright
94.4Bright
104.4Bright
114.5Bright
124.5Bright
134.6Bright
144.6Bright
154.7Bright
164.7Bright
174.8Bright
184.8Bright
194.8Bright
204.9Bright
214.9Bright
224.9Bright
234.9Bright
245.0Bright
255.0Bright
265.0Bright
275.0Bright
285.0Bright
295.0Bright
305.1Bright
Planning a trip in September

Is September a good time to visit San Pedro?

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

7.0
Sightseeing
4th-best month of the year
3.7
Beach & pool
8th-best month of the year

September is one of the better times to visit San Pedro for general sightseeing.

What to pack for San Pedro in September

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

In September, San Pedro sees daytime highs around 20°C and nights near 9°C. Worth packing: sun protection. About 6 days see rain.

sun protection

UV index in San Pedro 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 San Pedro peaks around January 15 at about 13 (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 11 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highModerateHighVery highExtremeJan 15UV 13Jun 19UV 3
UV index (midday)Level
Jan13Extreme
Feb11Extreme
Mar10Very high
Apr6High
May4Moderate
Jun3Moderate
Jul3Moderate
Aug4Moderate
Sep6High
Oct8Very high
Nov11Extreme
Dec12Extreme

Air quality in San Pedro 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 San Pedro is worst in August — around 40 µg/m³ PM2.5 (poor), about 6.5× the cleanest month (April, 6 µg/m³).

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

010203040JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateModerateGoodAug 1637 µg/m³Apr 156 µg/m³
PM2.5 (µg/m³)Level
Jan9Good
Feb7Good
Mar7Good
Apr6Good
May8Good
Jun10Good
Jul21Moderate
Aug40Poor
Sep17Moderate
Oct13Moderate
Nov8Good
Dec8Good
Location & terrain

Where is San Pedro?

San Pedro sits at 33.7°S, 59.7°W, 30 m above sea level, in Argentina. The nearest listed city is Baradero, 21 km away.

Topography around San Pedro

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

Within 3 km, the terrain around San Pedro has only modest variations in elevation — a maximum elevation change of 33 m around an average of 16 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 49 m; within 80 km, only modest variations in elevation — a maximum elevation change of 92 m.

The land around San Pedro is covered by artificial surfaces (27%) and wetland (24%) within 3 km, wetland (46%) and cropland (28%) within 16 km, and cropland (45%) and wetland (33%) within 80 km.

3 km
33 m
16 km
49 m
80 km
92 m
treesgrasslandcroplandartificial surfaceswaterwetland
September weather nearby: Baradero 21 km · Ramallo 38 km · Arrecifes 59 km · San Nicolás de los Arroyos 63 km · San Antonio de Areco 66 km · Gualeguay 68 km · Zárate 75 km · Carmen de Areco 79 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 San Pedro (-33.6792°, -59.6663°, elevation 30 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).