La Rioja weather in September

In September, La Rioja sees average daytime highs of 24°C and overnight lows near 12°C, with 24 mm of rain across 3.4 wet days and about 11.8 hours of daylight. It is the 7th-warmest and 9th-wettest month of the year here.

Highs climb over the month, from about 23°C in the first days to 26°C by the end. The sky is clear or mostly clear about 71% of the time in September, and the air most often feels dry.

Daylight stretches from about 11 h 24 min at the start of September to 12 h 12 min by month's end. Set against the rest of the year, September is La Rioja's 3rd-clearest and 1st-windiest month. For the whole year in context, see La Rioja's year-round climate.

Daytime high
24°
7th warmest
Overnight low
12°
5th coldest
Rainfall
24 mm
3.4 wet days
Daylight
11 h 48 min
7:27 AM – 7:17 PM
Cloud cover
30%
3rd clearest
Wind
9 km/h
1st windiest
Solar energy
5.43 kWh/m²
Travel score
8.5
out of 10

La Rioja is city in Capital Department, La Rioja Province, Argentina.

Density
13,116/km²
people per km²
Founded
1591

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 23°C in the first days to 26°C by the end.

A typical September day in La Rioja reaches about 24°C in the afternoon and slips back to 12°C overnight — a 12°C spread between the day's warmth and the night's chill. On most days the high lands between 18°C and 31°C. Set against its neighbours, September runs about 4°C warmer than August and about 4°C cooler than October.

10°20°30°151015202530
Avg high (°C)Avg low (°C)
12310
22311
32311
42311
52311
62311
72311
82311
92411
102412
112412
122412
132412
142412
152412
162412
172512
182512
192513
202513
212513
222513
232513
242513
252513
262613
272614
282614
292614
302614

How September really feels in La Rioja

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.

La Rioja weather by month

How September compares with the rest of the year at a glance. September is the 7th-warmest and 9th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan32° / 22°10211.213.73.9
Feb31° / 21°769.613.14.8
Mar28° / 19°789.812.26.1
Apr24° / 15°477.911.37.4
May20° / 11°295.510.57.1
Jun17° / 153.410.26.5
Jul17° / 102.210.37.0
Aug21° / 102.110.98.3
Sep24° / 12°243.411.88.5
Oct28° / 16°48612.77.1
Nov30° / 19°617.713.55.3
Dec32° / 21°859.313.84.2

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 71% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 9% of September, with mostly cloudy or overcast conditions the remaining 21%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
18119
28020
37921
47921
57921
67921
77921
88020
98020
108020
118119
128119
138218
148218
158218
168218
178119
188119
198119
208119
217921
227921
237822
247822
257822
267723
277723
287624
297624
307525

Chance of precipitation in September

Any precipitation

La Rioja gets around 24 mm of rain over 3.4 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 11% and peaks near 14% on the wettest days.

0%10%20%30%151015202530
Rain chance (%)
19
29
39
410
510
610
710
810
910
1010
1110
1210
1310
1410
1510
1611
1711
1811
1911
2011
2111
2212
2312
2412
2512
2613
2713
2814
2914
3014

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 97% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)
19910
29820
39820
49820
59820
69820
79820
89820
99820
109820
119820
129820
139820
149820
159820
169820
179820
189820
199730
209730
219730
229640
239541
249451
259451
269451
279361
289361
299172
309172

Wind in September

Winds average 9 km/h in September, the windiest month of the year.

Across September, daily wind ranges from about 8 km/h on the calmest days to 9 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
18calm
28calm
38calm
48calm
58calm
69calm
79calm
89calm
99calm
109calm
119calm
129calm
139calm
149calm
159calm
169calm
179calm
189calm
199calm
209calm
219calm
229calm
239calm
249calm
259calm
269calm
279calm
289calm
299calm
309calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 11 h 24 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 48 minutes over September. Sunrise moves from 7:46 AM to 7:09 AM, and sunset from 7:09 PM to 7:24 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
111.47:467:09
211.47:457:09
311.47:437:10
411.57:427:10
511.57:417:11
611.57:407:11
711.67:387:12
811.67:377:12
911.67:367:13
1011.67:357:13
1111.77:337:14
1211.77:327:14
1311.77:317:15
1411.87:307:15
1511.87:287:16
1611.87:277:17
1711.97:267:17
1811.97:247:18
1911.97:237:18
2011.97:227:19
2112.07:217:19
2212.07:197:20
2312.07:187:20
2412.17:177:21
2512.17:157:21
2612.17:147:22
2712.27:137:23
2812.27:127:23
2912.27:107:24
3012.27:097:24

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.43 kWh/m².

For context, solar energy here swings from a low near 3.01 kWh/m² to a high of 6.72 kWh/m² in December across the year — September's 5.43 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.0Bright
25.0Bright
35.0Bright
45.0Bright
55.1Bright
65.1Bright
75.2Bright
85.2Bright
95.2Bright
105.3Bright
115.3Bright
125.4Bright
135.4Bright
145.4Bright
155.5Bright
165.5Bright
175.5Bright
185.6Bright
195.6Bright
205.6Bright
215.6Bright
225.7Bright
235.7Bright
245.7Bright
255.7Bright
265.7Bright
275.7Bright
285.8Bright
295.8Bright
305.8Bright
Planning a trip in September

Hazard calendar for La Rioja

In seasonPeak

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

La Rioja's rainy season runs October–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 La Rioja?

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

8.5
Sightseeing
1st-best month of the year
7.3
Beach & pool
3rd-best month of the year

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

What to pack for La Rioja in September

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

In September, La Rioja sees daytime highs around 24°C and nights near 12°C. Worth packing: light clothes and sun protection. About 3 days see rain.

light clothessun protection

UV index in La Rioja in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 7 — 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 Rioja peaks around January 20 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 22 at about 4 (moderate).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeHighModerateVery highExtremeJan 20UV 14Jun 22UV 4
UV index (midday)Level
Jan14Extreme
Feb14Extreme
Mar12Extreme
Apr7High
May5Moderate
Jun4Moderate
Jul4Moderate
Aug5Moderate
Sep7Very high
Oct11Extreme
Nov13Extreme
Dec13Extreme
Location & terrain

Where is La Rioja?

La Rioja sits at 29.4°S, 66.9°W, 493 m above sea level, in Argentina. The nearest listed city is Chilecito, 68 km away.

Cruz del EjeAguilaresDeán Funes

Topography around La Rioja

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

Within 3 km, the terrain around La Rioja has only modest variations in elevation — a maximum elevation change of 141 m around an average of 516 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,895 m; within 80 km, extreme variations in elevation — a maximum elevation change of 3,858 m.

The land around La Rioja is covered by artificial surfaces (70%) within 3 km, shrubs (58%) and trees (24%) within 16 km, and shrubs (76%) within 80 km.

3 km
141 m
16 km
1,895 m
80 km
3,858 m
treesshrubsgrasslandcroplandartificial surfacesbare terrain
September weather nearby: Chilecito 68 km · Aimogasta 95 km · Catamarca 148 km · San Isidro 153 km · Belén 197 km · Cruz del Eje 246 km · Aguilares 252 km · Deán Funes 266 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 Rioja (-29.4133°, -66.8564°, elevation 493 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).