Tunuyán weather in September

In September, Tunuyán sees average daytime highs of 17°C and overnight lows near 4°C, with 62 mm of precipitation across 9.1 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 15°C in the first days to 18°C by the end. The sky is clear or mostly clear about 58% 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 Tunuyán's 6th-clearest and 5th-windiest month. For the whole year in context, see Tunuyán's year-round climate.

Daytime high
17°
8th warmest
Overnight low
5th coldest
Precipitation
62 mm
9.1 wet days
Daylight
11 h 48 min
7:37 AM – 7:24 PM
Cloud cover
37%
6th clearest
Wind
7 km/h
5th windiest
Solar energy
5.54 kWh/m²
Travel score
5.8
out of 10

Tunuyán is city in Mendoza, Argentina.

Founded
1880

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 15°C in the first days to 18°C by the end.

A typical September day in Tunuyán reaches about 17°C in the afternoon and slips back to 4°C overnight — a 13°C spread between the day's warmth and the night's chill. On most days the high lands between 11°C and 23°C. Set against its neighbours, September runs about 3°C warmer than August and about 4°C cooler than October.

10°20°151015202530
Avg high (°C)Avg low (°C)
1153
2153
3153
4153
5153
6153
7163
8163
9164
10164
11164
12164
13164
14174
15174
16174
17174
18174
19175
20175
21185
22185
23185
24185
25185
26185
27185
28185
29196
30196

How September really feels in Tunuyán

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
0
heat index over the day's high
Days feeling ≤ C
0
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.

Tunuyán 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.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan28° / 15°6810.20146.6
Feb26° / 14°6810013.26.8
Mar24° / 12°8511.7012.36.9
Apr19° / 80110.111.26.3
May15° / 6710.50.510.34.5
Jun12° / 547.91.49.83.3
Jul11° / -0°497.62.3103.1
Aug14° / 567.81.910.84.4
Sep17° / 629.10.911.85.8
Oct21° / 8310.40.112.86.9
Nov24° / 10°7910.8013.77.2
Dec27° / 13°759.9014.26.9

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 58% 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 29%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
16931
26733
36733
46733
56733
66832
76832
86832
96931
106931
117129
127129
137129
147228
157327
167426
177426
187426
197426
207426
217426
227426
237426
247426
257426
267426
277426
287426
297327
307327

Chance of precipitation in September

Any precipitationSnow

Tunuyán gets around 62 mm of rain and snow over 9.1 wet days in September. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable precipitation averages around 31% and peaks near 34% on the wettest days, and about 1 day brings snow.

0%10%20%30%40%151015202530
Rain chance (%)Snow chance (%)
1295
2305
3305
4315
5314
6314
7314
8314
9314
10314
11303
12303
13303
14303
15293
16293
17293
18293
19293
20293
21292
22292
23302
24312
25312
26321
27321
28331
29341
30341

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.

0%25%50%75%100%151015202530
Dry (%)
1100
2100
3100
4100
5100
6100
7100
8100
9100
10100
11100
12100
13100
14100
15100
16100
17100
18100
19100
20100
21100
22100
23100
24100
25100
26100
27100
28100
29100
30100

Wind in September

Winds average 7 km/h in September.

Across September, daily wind ranges from about 7 km/h on the calmest days to 7 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (km/h)Feels
17calm
27calm
37calm
47calm
57calm
67calm
77calm
87calm
97calm
107calm
117calm
127calm
137calm
147calm
157calm
167calm
177calm
187calm
197calm
207calm
217calm
227calm
237calm
247calm
257calm
267calm
277calm
287calm
297calm
307calm

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 7:58 AM to 7:17 AM, and sunset from 7:14 PM to 7:34 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
111.37:587:14
211.37:567:15
311.37:557:15
411.47:547:16
511.47:527:17
611.47:517:17
711.57:497:18
811.57:487:19
911.57:477:19
1011.67:457:20
1111.67:447:21
1211.77:427:21
1311.77:417:22
1411.77:397:23
1511.87:387:24
1611.87:377:24
1711.87:357:25
1811.97:347:26
1911.97:327:26
2011.97:317:27
2112.07:297:28
2212.07:287:28
2312.07:267:29
2412.17:257:30
2512.17:247:31
2612.27:227:31
2712.27:217:32
2812.27:197:33
2912.37:187:33
3012.37:177:34

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.54 kWh/m².

For context, solar energy here swings from a low near 2.83 kWh/m² to a high of 8.35 kWh/m² in December across the year — September's 5.54 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
14.8Bright
24.9Bright
34.9Bright
45.0Bright
55.0Bright
65.0Bright
75.1Bright
85.1Bright
95.2Bright
105.3Bright
115.3Bright
125.4Bright
135.4Bright
145.5Bright
155.5Bright
165.6Bright
175.6Bright
185.7Bright
195.7Bright
205.8Bright
215.8Bright
225.9Bright
235.9Bright
246.0Bright
256.0Bright
266.0Intense
276.1Intense
286.1Intense
296.2Intense
306.2Intense
Planning a trip in September

Is September a good time to visit Tunuyán?

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

5.8
Sightseeing
8th-best month of the year
1.3
Beach & pool
8th-best month of the year

September is a reasonable time to visit Tunuyán for sightseeing.

What to pack for Tunuyán in September

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

In September, Tunuyán sees daytime highs around 17°C and nights near 4°C. Worth packing: a warm layer, rain gear and sun protection. About 9 days see rain.

a warm layerrain gearsun protection

UV index in Tunuyán 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 Tunuyán peaks around January 17 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 20 at about 3 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 11 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeHighModerateHighExtremeJan 17UV 15Jun 20UV 3
UV index (midday)Level
Jan15Extreme
Feb14Extreme
Mar11Extreme
Apr6High
May5High
Jun3Moderate
Jul4Moderate
Aug6High
Sep6High
Oct10Extreme
Nov12Extreme
Dec13Extreme
Location & terrain

Where is Tunuyán?

Tunuyán sits at 33.6°S, 69.0°W, 864 m above sea level, in Argentina. The nearest listed city is Tupungato, 27 km away.

Topography around Tunuyán

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

Within 3 km, the terrain around Tunuyán has only modest variations in elevation — a maximum elevation change of 92 m around an average of 885 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 203 m; within 80 km, extreme variations in elevation — a maximum elevation change of 5,950 m.

The land around Tunuyán is covered by grassland (29%), shrubs (23%) and cropland (20%) within 3 km, shrubs (44%) and cropland (28%) within 16 km, and shrubs (44%), grassland (25%) and bare terrain (21%) within 80 km.

3 km
92 m
16 km
203 m
80 km
5,950 m
treesshrubsgrasslandcroplandartificial surfacesbare terrainsnow and icewater
September weather nearby: Tupungato 27 km · Perdriel 58 km · Rivadavia 67 km · Rodeo del Medio 72 km · San Martín 75 km · Mendoza 79 km · San Rafael 131 km · Peñalolén 141 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 Tunuyán (-33.5812°, -69.0154°, elevation 864 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).