Libertador General San Martín weather in September

In September, Libertador General San Martín sees average daytime highs of 26°C and overnight lows near 11°C, with 36 mm of rain across 6.3 wet days and about 11.9 hours of daylight. It is the 7th-warmest and 10th-wettest month of the year here.

Highs climb over the month, from about 25°C in the first days to 27°C by the end. The sky is clear or mostly clear about 56% of the time in September, and the air most often feels dry.

Daylight stretches from about 11 h 30 min at the start of September to 12 h 12 min by month's end. Set against the rest of the year, September is Libertador General San Martín's 2nd-clearest and 2nd-windiest month. For the whole year in context, see Libertador General San Martín's year-round climate.

Daytime high
26°
7th warmest
Overnight low
11°
5th coldest
Rainfall
36 mm
6.3 wet days
Daylight
11 h 54 min
7:18 AM – 7:09 PM
Cloud cover
40%
2nd clearest
Wind
6 km/h
2nd windiest
Solar energy
5.46 kWh/m²
Travel score
7.6
out of 10

Libertador General San Martín is human settlement.

Founded
1899

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 25°C in the first days to 27°C by the end.

A typical September day in Libertador General San Martín reaches about 26°C in the afternoon and slips back to 11°C overnight — a 14°C spread between the day's warmth and the night's chill. On most days the high lands between 18°C and 33°C. Set against its neighbours, September runs about 3°C warmer than August and about 2°C cooler than October.

10°20°30°151015202530
Avg high (°C)Avg low (°C)
12510
22510
32510
42510
52510
62510
72510
82511
92511
102511
112511
122511
132511
142611
152611
162611
172612
182612
192612
202612
212612
222612
232612
242613
252613
262713
272713
282713
292713
302714

Libertador General San Martín weather by month

How September compares with the rest of the year at a glance. September is the 7th-warmest and 10th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan29° / 20°23217.513.34.4
Feb28° / 19°23917.712.84.7
Mar26° / 18°27520.712.24.8
Apr24° / 15°19618.811.55.3
May21° / 11°1011610.95.4
Jun19° / 5010.310.66.0
Jul19° / 316.610.76.9
Aug23° / 254.611.28.1
Sep26° / 11°366.311.97.6
Oct28° / 16°10311.512.66.0
Nov29° / 17°1651413.25.1
Dec29° / 19°24116.713.44.5

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 56% 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 31%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
17525
27525
37426
47426
57327
67228
77228
87129
97129
107129
117030
127030
137030
147030
157030
167030
177030
186931
196931
206832
216733
226634
236634
246535
256436
266337
276238
286139
296040
305941

Chance of precipitation in September

Any precipitation

Libertador General San Martín gets around 36 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 28% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%40%151015202530
Rain chance (%)
115
216
317
417
518
618
719
819
919
1019
1119
1219
1320
1420
1520
1621
1721
1821
1922
2022
2123
2223
2324
2424
2525
2626
2727
2827
2928
3028

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 73% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)
178175
277185
377185
478175
578175
678175
778175
879165
979165
1080164
1180164
1280164
1379165
1479165
1579165
1679165
1777176
1876177
1976177
2074188
2172199
2271209
23692110
24672211
25652312
26632314
27612415
28602416
29592417
30572518

Wind in September

Winds average 6 km/h in September.

Across September, daily wind ranges from about 5 km/h on the calmest days to 6 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
86calm
96calm
106calm
116calm
126calm
136calm
146calm
156calm
166calm
176calm
186calm
196calm
206calm
216calm
226calm
236calm
246calm
256calm
266calm
276calm
286calm
296calm
306calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 11 h 30 min at the start of September to 12 h 12 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 42 minutes over September. Sunrise moves from 7:33 AM to 7:03 AM, and sunset from 7:04 PM to 7:14 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
111.57:337:04
211.57:327:05
311.67:317:05
411.67:307:05
511.67:297:06
611.67:287:06
711.77:277:06
811.77:267:07
911.77:257:07
1011.77:247:07
1111.77:237:08
1211.87:227:08
1311.87:217:08
1411.87:207:09
1511.87:197:09
1611.97:187:09
1711.97:177:10
1811.97:157:10
1911.97:147:10
2012.07:137:11
2112.07:127:11
2212.07:117:11
2312.07:107:12
2412.17:097:12
2512.17:087:13
2612.17:077:13
2712.17:067:13
2812.17:057:14
2912.27:047:14
3012.27:037:14

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.46 kWh/m².

For context, solar energy here swings from a low near 3.36 kWh/m² to a high of 5.67 kWh/m² in December across the year — September's 5.46 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.3Bright
25.3Bright
35.3Bright
45.3Bright
55.3Bright
65.3Bright
75.3Bright
85.4Bright
95.4Bright
105.4Bright
115.4Bright
125.4Bright
135.5Bright
145.5Bright
155.5Bright
165.5Bright
175.5Bright
185.5Bright
195.5Bright
205.5Bright
215.6Bright
225.6Bright
235.6Bright
245.6Bright
255.6Bright
265.6Bright
275.6Bright
285.6Bright
295.6Bright
305.6Bright
Planning a trip in September

Hazard calendar for Libertador General San Martín

In seasonPeak

None of Libertador General San Martín's seasonal hazards are active in September. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.

Libertador General San Martín's rainy season runs November–April, when most of the year's rain falls.

Rainy season
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is September a good time to visit Libertador General San Martín?

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

7.6
Sightseeing
2nd-best month of the year
7.1
Beach & pool
1st-best month of the year

September is one of the better times to visit Libertador General San Martín for general sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Libertador General San Martín in September

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

In September, Libertador General San Martín sees daytime highs around 26°C and nights near 11°C. Worth packing: light clothes and sun protection. About 6 days see rain.

light clothessun protection

UV index in Libertador General San Martín 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 Libertador General San Martín peaks around January 18 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 10 at about 5 (high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highHighVery highExtremeJan 18UV 15Jul 10UV 5
UV index (midday)Level
Jan15Extreme
Feb14Extreme
Mar13Extreme
Apr8Very high
May7High
Jun5High
Jul5High
Aug8Very high
Sep9Very high
Oct9Very high
Nov13Extreme
Dec14Extreme

Air quality in Libertador General San Martín 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 Libertador General San Martín is worst in September — around 26 µg/m³ PM2.5 (moderate), about 5.6× the cleanest month (May, 5 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateSep 2326 µg/m³May 155 µg/m³
PM2.5 (µg/m³)Level
Jan9Good
Feb9Good
Mar7Good
Apr6Good
May5Good
Jun6Good
Jul8Good
Aug13Moderate
Sep26Moderate
Oct26Moderate
Nov19Moderate
Dec13Moderate
Location & terrain

Where is Libertador General San Martín?

Libertador General San Martín sits at 23.8°S, 64.8°W, 464 m above sea level, in Argentina. The nearest listed city is San Pedro de Jujuy, 47 km away.

Topography around Libertador General San Martín

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

Within 3 km, the terrain around Libertador General San Martín has significant variations in elevation — a maximum elevation change of 324 m around an average of 488 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 1,160 m; within 80 km, extreme variations in elevation — a maximum elevation change of 4,815 m.

The land around Libertador General San Martín is covered by cropland (45%), trees (27%) and artificial surfaces (21%) within 3 km, trees (64%) and cropland (29%) within 16 km, and trees (64%) within 80 km.

3 km
324 m
16 km
1,160 m
80 km
4,815 m
treesshrubsgrasslandcroplandartificial surfacesbare terrain
September weather nearby: San Pedro de Jujuy 47 km · Santa Rosa 60 km · Palpalá 65 km · San Salvador de Jujuy 66 km · Pichanal 81 km · San Ramón de la Nueva Orán 89 km · Embarcación 97 km · General Güemes 99 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 Libertador General San Martín (-23.8131°, -64.7935°, elevation 464 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).