San Martín weather in September

In September, San Martín sees average daytime highs of 22°C and overnight lows near 10°C, with 12 mm of rain across 2.3 wet days and about 11.8 hours of daylight. It is the 8th-warmest and 9th-wettest month of the year here.

Highs climb over the month, from about 20°C in the first days to 24°C by the end. The sky is clear or mostly clear about 67% 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 Martín's 2nd-clearest and 4th-windiest month. For the whole year in context, see San Martín's year-round climate.

Daytime high: 22°; 8th warmest
Overnight low: 10°; 5th coldest
Rainfall: 12 mm; 2.3 wet days
Daylight: 11 h 48 min; 7:34 AM – 7:22 PM
Cloud cover: 30%; 2nd clearest
Wind: 11 km/h; 4th windiest
Solar energy: 5.39 kWh/m²
Travel score: 8.4; out of 10

San Martín is city in the Mendoza Province, Argentina.

Density: 55/km²; people per km²
Founded: 1816

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

← August San Martín year-round climate October →Best places to visit in September

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

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 20°C in the first days to 24°C by the end.

A typical September day in San Martín reaches about 22°C in the afternoon and slips back to 10°C overnight — a 13°C spread between the day's warmth and the night's chill. On most days the high lands between 15°C and 28°C. Set against its neighbours, September runs about 4°C warmer than August and about 4°C cooler than October.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Avg high (°C)	20	20	20	20	21	21	21	21	21	21	21	21	22	22	22	22	22	22	23	23	23	23	23	23	23	23	24	24	24	24
Avg low (°C)	8	8	8	8	8	8	8	9	9	9	9	9	9	9	9	10	10	10	10	10	10	10	11	11	11	11	11	11	11	11

	Avg high (°C)	Avg low (°C)
1	20	8
2	20	8
3	20	8
4	20	8
5	21	8
6	21	8
7	21	8
8	21	9
9	21	9
10	21	9
11	21	9
12	21	9
13	22	9
14	22	9
15	22	9
16	22	10
17	22	10
18	22	10
19	23	10
20	23	10
21	23	10
22	23	10
23	23	11
24	23	11
25	23	11
26	23	11
27	24	11
28	24	11
29	24	11
30	24	11

How September really feels in San Martín

Once humidity and wind are folded in, September averages 0 days that feel above 32°C and 0 that feel at or below 0°C — the comfort signal a plain temperature reading hides.

Days feeling ≥ 32°C

heat index over the day's high

Days feeling ≤ 0°C

wind chill below the day's low

September sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

San Martín weather by month

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

Month	High / Low (°C)	Rainfall (mm)	Wet days	Daylight (hours)	Travel score
Jan	33° / 21°	48	7.8	13.9	4.0
Feb	31° / 19°	37	6.3	13.2	5.0
Mar	28° / 17°	43	6.2	12.3	6.9
Apr	23° / 12°	20	4.3	11.2	8.2
May	19° / 8°	13	2.6	10.3	7.2
Jun	15° / 4°	6	1.3	9.9	5.9
Jul	15° / 3°	6	1.6	10	5.9
Aug	18° / 6°	10	1.9	10.8	7.6
Sep	22° / 10°	12	2.3	11.8	8.4
Oct	26° / 14°	20	3.9	12.8	8.1
Nov	30° / 17°	27	5.1	13.7	6.1
Dec	32° / 19°	38	6.7	14.1	4.4

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 67% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 11% of September, with mostly cloudy or overcast conditions the remaining 22%.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Clearer (%)	78	78	78	78	78	78	78	78	78	79	79	79	80	80	79	79	79	79	79	79	79	78	78	78	78	78	78	78	77	77
Cloudier (%)	22	22	22	22	22	22	22	22	22	21	21	21	20	20	21	21	21	21	21	21	21	22	22	22	22	22	22	22	23	23

	Clearer (%)	Cloudier (%)
1	78	22
2	78	22
3	78	22
4	78	22
5	78	22
6	78	22
7	78	22
8	78	22
9	78	22
10	79	21
11	79	21
12	79	21
13	80	20
14	80	20
15	79	21
16	79	21
17	79	21
18	79	21
19	79	21
20	79	21
21	79	21
22	78	22
23	78	22
24	78	22
25	78	22
26	78	22
27	78	22
28	78	22
29	77	23
30	77	23

Chance of precipitation in September

Any precipitation

San Martín gets around 12 mm of rain over 2.3 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 8% and peaks near 11% on the wettest days.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Rain chance (%)	6	7	7	7	7	7	7	8	8	8	8	8	8	8	8	8	8	8	8	8	8	9	9	9	10	10	10	11	11	11

	Rain chance (%)
1	6
2	7
3	7
4	7
5	7
6	7
7	7
8	8
9	8
10	8
11	8
12	8
13	8
14	8
15	8
16	8
17	8
18	8
19	8
20	8
21	8
22	9
23	9
24	9
25	10
26	10
27	10
28	11
29	11
30	11

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 100% of days. It rarely turns muggy — the humid and sticky bands barely register.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Dry (%)	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100

	Dry (%)
1	100
2	100
3	100
4	100
5	100
6	100
7	100
8	100
9	100
10	100
11	100
12	100
13	100
14	100
15	100
16	100
17	100
18	100
19	100
20	100
21	100
22	100
23	100
24	100
25	100
26	100
27	100
28	100
29	100
30	100

Wind in September

Winds average 11 km/h in September.

Across September, daily wind ranges from about 11 km/h on the calmest days to 12 km/h at its breeziest. It stays fairly steady from day to day.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Wind speed (km/h)	11	11	11	11	11	11	11	11	11	11	11	11	11	11	11	11	12	12	12	12	12	12	12	12	12	12	12	12	12	12
Feels	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm

	Wind speed (km/h)	Feels
1	11	calm
2	11	calm
3	11	calm
4	11	calm
5	11	calm
6	11	calm
7	11	calm
8	11	calm
9	11	calm
10	11	calm
11	11	calm
12	11	calm
13	11	calm
14	11	calm
15	11	calm
16	11	calm
17	12	calm
18	12	calm
19	12	calm
20	12	calm
21	12	calm
22	12	calm
23	12	calm
24	12	calm
25	12	calm
26	12	calm
27	12	calm
28	12	calm
29	12	calm
30	12	calm

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 7:55 AM to 7:15 AM, and sunset from 7:12 PM to 7:32 PM.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Daylight (h)	11.3	11.3	11.3	11.4	11.4	11.5	11.5	11.5	11.6	11.6	11.6	11.7	11.7	11.7	11.8	11.8	11.8	11.9	11.9	11.9	12.0	12.0	12.0	12.1	12.1	12.1	12.2	12.2	12.3	12.3
Sunrise (AM)	7:55	7:54	7:52	7:51	7:50	7:48	7:47	7:46	7:44	7:43	7:41	7:40	7:39	7:37	7:36	7:34	7:33	7:31	7:30	7:29	7:27	7:26	7:24	7:23	7:22	7:20	7:19	7:17	7:16	7:15
Sunset (PM)	7:12	7:13	7:13	7:14	7:15	7:15	7:16	7:17	7:17	7:18	7:19	7:19	7:20	7:21	7:21	7:22	7:23	7:24	7:24	7:25	7:26	7:26	7:27	7:28	7:28	7:29	7:30	7:30	7:31	7:32

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	11.3	7:55	7:12
2	11.3	7:54	7:13
3	11.3	7:52	7:13
4	11.4	7:51	7:14
5	11.4	7:50	7:15
6	11.5	7:48	7:15
7	11.5	7:47	7:16
8	11.5	7:46	7:17
9	11.6	7:44	7:17
10	11.6	7:43	7:18
11	11.6	7:41	7:19
12	11.7	7:40	7:19
13	11.7	7:39	7:20
14	11.7	7:37	7:21
15	11.8	7:36	7:21
16	11.8	7:34	7:22
17	11.8	7:33	7:23
18	11.9	7:31	7:24
19	11.9	7:30	7:24
20	11.9	7:29	7:25
21	12.0	7:27	7:26
22	12.0	7:26	7:26
23	12.0	7:24	7:27
24	12.1	7:23	7:28
25	12.1	7:22	7:28
26	12.1	7:20	7:29
27	12.2	7:19	7:30
28	12.2	7:17	7:30
29	12.3	7:16	7:31
30	12.3	7:15	7:32

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.39 kWh/m².

For context, solar energy here swings from a low near 2.86 kWh/m² to a high of 7.86 kWh/m² in December across the year — September's 5.39 kWh/m² falls in the middle.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Solar energy (kWh/m²)	4.8	4.8	4.8	4.9	4.9	5.0	5.0	5.1	5.1	5.2	5.2	5.3	5.3	5.3	5.4	5.4	5.5	5.5	5.6	5.6	5.6	5.7	5.7	5.7	5.8	5.8	5.8	5.8	5.9	5.9
Level	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright

	Solar energy (kWh/m²)	Level
1	4.8	Bright
2	4.8	Bright
3	4.8	Bright
4	4.9	Bright
5	4.9	Bright
6	5.0	Bright
7	5.0	Bright
8	5.1	Bright
9	5.1	Bright
10	5.2	Bright
11	5.2	Bright
12	5.3	Bright
13	5.3	Bright
14	5.3	Bright
15	5.4	Bright
16	5.4	Bright
17	5.5	Bright
18	5.5	Bright
19	5.6	Bright
20	5.6	Bright
21	5.6	Bright
22	5.7	Bright
23	5.7	Bright
24	5.7	Bright
25	5.8	Bright
26	5.8	Bright
27	5.8	Bright
28	5.8	Bright
29	5.9	Bright
30	5.9	Bright

Planning a trip in September

Is September a good time to visit San Martín?

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

8.4

Sightseeing

1st-best month of the year

5.7

Beach & pool

8th-best month of the year

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

What to pack for San Martín in September

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

In September, San Martín sees daytime highs around 22°C and nights near 10°C. Worth packing: light clothes and sun protection.

light clothessun protection

UV index in San Martín 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 Martín peaks around January 18 at about 14 (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.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
UV index (midday)	14	13	10	6	4	3	3	4	6	10	12	13
Level	Extreme	Extreme	Extreme	High	Moderate	Moderate	Moderate	Moderate	High	Very high	Extreme	Extreme

	UV index (midday)	Level
Jan	14	Extreme
Feb	13	Extreme
Mar	10	Extreme
Apr	6	High
May	4	Moderate
Jun	3	Moderate
Jul	3	Moderate
Aug	4	Moderate
Sep	6	High
Oct	10	Very high
Nov	12	Extreme
Dec	13	Extreme

Location & terrain

Where is San Martín?

San Martín sits at 33.1°S, 68.5°W, 656 m above sea level, in Argentina. The nearest listed city is Rivadavia, 12 km away.

Topography around San Martín

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

Within 3 km, the terrain around San Martín has only modest variations in elevation — a maximum elevation change of 18 m around an average of 658 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 67 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,924 m.

The land around San Martín is covered by artificial surfaces (44%) within 3 km, cropland (38%), shrubs (25%) and grassland (25%) within 16 km, and shrubs (69%) within 80 km.

3 km

18 m

artificial surfaces 44%

16 km

67 m

cropland 38%

80 km

2,924 m

shrubs 69%

treesshrubsgrasslandcroplandartificial surfacesbare terrain

← August San Martín year-round climate October →Best places to visit in September

September weather nearby: Rivadavia 12 km · Rodeo del Medio 22 km · Perdriel 39 km · Mendoza 41 km · Tupungato 70 km · Tunuyán 75 km · Pocito 156 km · Caucete 160 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

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 Martín (-33.0834°, -68.4731°, elevation 656 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. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).

	Avg high (°C)	Avg low (°C)
1	20	8
2	20	8
3	20	8
4	20	8
5	21	8
6	21	8
7	21	8
8	21	9
9	21	9
10	21	9
11	21	9
12	21	9
13	22	9
14	22	9
15	22	9
16	22	10
17	22	10
18	22	10
19	23	10
20	23	10
21	23	10
22	23	10
23	23	11
24	23	11
25	23	11
26	23	11
27	24	11
28	24	11
29	24	11
30	24	11

	Clearer (%)	Cloudier (%)
1	78	22
2	78	22
3	78	22
4	78	22
5	78	22
6	78	22
7	78	22
8	78	22
9	78	22
10	79	21
11	79	21
12	79	21
13	80	20
14	80	20
15	79	21
16	79	21
17	79	21
18	79	21
19	79	21
20	79	21
21	79	21
22	78	22
23	78	22
24	78	22
25	78	22
26	78	22
27	78	22
28	78	22
29	77	23
30	77	23

	Rain chance (%)
1	6
2	7
3	7
4	7
5	7
6	7
7	7
8	8
9	8
10	8
11	8
12	8
13	8
14	8
15	8
16	8
17	8
18	8
19	8
20	8
21	8
22	9
23	9
24	9
25	10
26	10
27	10
28	11
29	11
30	11

	Dry (%)
1	100
2	100
3	100
4	100
5	100
6	100
7	100
8	100
9	100
10	100
11	100
12	100
13	100
14	100
15	100
16	100
17	100
18	100
19	100
20	100
21	100
22	100
23	100
24	100
25	100
26	100
27	100
28	100
29	100
30	100

	Avg high (°C)	Avg low (°C)
1	20	8
2	20	8
3	20	8
4	20	8
5	21	8
6	21	8
7	21	8
8	21	9
9	21	9
10	21	9
11	21	9
12	21	9
13	22	9
14	22	9
15	22	9
16	22	10
17	22	10
18	22	10
19	23	10
20	23	10
21	23	10
22	23	10
23	23	11
24	23	11
25	23	11
26	23	11
27	24	11
28	24	11
29	24	11
30	24	11

	Clearer (%)	Cloudier (%)
1	78	22
2	78	22
3	78	22
4	78	22
5	78	22
6	78	22
7	78	22
8	78	22
9	78	22
10	79	21
11	79	21
12	79	21
13	80	20
14	80	20
15	79	21
16	79	21
17	79	21
18	79	21
19	79	21
20	79	21
21	79	21
22	78	22
23	78	22
24	78	22
25	78	22
26	78	22
27	78	22
28	78	22
29	77	23
30	77	23

	Rain chance (%)
1	6
2	7
3	7
4	7
5	7
6	7
7	7
8	8
9	8
10	8
11	8
12	8
13	8
14	8
15	8
16	8
17	8
18	8
19	8
20	8
21	8
22	9
23	9
24	9
25	10
26	10
27	10
28	11
29	11
30	11

	Dry (%)
1	100
2	100
3	100
4	100
5	100
6	100
7	100
8	100
9	100
10	100
11	100
12	100
13	100
14	100
15	100
16	100
17	100
18	100
19	100
20	100
21	100
22	100
23	100
24	100
25	100
26	100
27	100
28	100
29	100
30	100

	Avg high (°C)	Avg low (°C)
1	20	8
2	20	8
3	20	8
4	20	8
5	21	8
6	21	8
7	21	8
8	21	9
9	21	9
10	21	9
11	21	9
12	21	9
13	22	9
14	22	9
15	22	9
16	22	10
17	22	10
18	22	10
19	23	10
20	23	10
21	23	10
22	23	10
23	23	11
24	23	11
25	23	11
26	23	11
27	24	11
28	24	11
29	24	11
30	24	11

	Clearer (%)	Cloudier (%)
1	78	22
2	78	22
3	78	22
4	78	22
5	78	22
6	78	22
7	78	22
8	78	22
9	78	22
10	79	21
11	79	21
12	79	21
13	80	20
14	80	20
15	79	21
16	79	21
17	79	21
18	79	21
19	79	21
20	79	21
21	79	21
22	78	22
23	78	22
24	78	22
25	78	22
26	78	22
27	78	22
28	78	22
29	77	23
30	77	23

	Rain chance (%)
1	6
2	7
3	7
4	7
5	7
6	7
7	7
8	8
9	8
10	8
11	8
12	8
13	8
14	8
15	8
16	8
17	8
18	8
19	8
20	8
21	8
22	9
23	9
24	9
25	10
26	10
27	10
28	11
29	11
30	11

	Dry (%)
1	100
2	100
3	100
4	100
5	100
6	100
7	100
8	100
9	100
10	100
11	100
12	100
13	100
14	100
15	100
16	100
17	100
18	100
19	100
20	100
21	100
22	100
23	100
24	100
25	100
26	100
27	100
28	100
29	100
30	100