Río Gallegos weather in September

In September, Río Gallegos sees average daytime highs of 11°C and overnight lows near 2°C, with 21 mm of precipitation across 6.1 wet days and about 11.6 hours of daylight. It is the 8th-warmest and 11th-wettest month of the year here.

Highs climb over the month, from about 9°C in the first days to 12°C by the end. The sky is clear or mostly clear about 22% of the time in September, and the air most often feels dry.

Daylight stretches from about 10 h 36 min at the start of September to 12 h 36 min by month's end. Set against the rest of the year, September is Río Gallegos's 6th-clearest and 7th-windiest month. For the whole year in context, see Río Gallegos's year-round climate.

Daytime high: 11°; 8th warmest
Overnight low: 2°; 5th coldest
Precipitation: 21 mm; 6.1 wet days
Daylight: 11 h 36 min; 7:43 AM – 7:20 PM
Cloud cover: 65%; 6th clearest
Wind: 21 km/h; 7th windiest
Solar energy: 3.12 kWh/m²
Travel score: 2.7; out of 10

Río Gallegos is capital and largest settlement of the Patagonian province of Santa Cruz in Argentina.

Founded: 1885

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

← August Río Gallegos 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 9°C in the first days to 12°C by the end.

A typical September day in Río Gallegos reaches about 11°C in the afternoon and slips back to 2°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 7°C and 15°C. Set against its neighbours, September runs about 3°C warmer than August and about 3°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)	9	9	9	9	9	9	10	10	10	10	10	10	10	10	10	11	11	11	11	11	11	11	12	12	12	12	12	12	12	12
Avg low (°C)	1	1	1	1	1	1	1	1	2	2	2	2	2	2	2	2	2	2	2	2	2	2	3	3	3	3	3	3	3	3

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

How September really feels in Río Gallegos

Once humidity and wind are folded in, September averages 0 days that feel above 32°C and 30 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

The story in September is cold — wind chill drags the overnight "feels like" below the raw low.

Río Gallegos weather by month

How September compares with the rest of the year at a glance. September is the 8th-warmest and 11th-wettest month here — the current month is highlighted below.

Month	High / Low (°C)	Rainfall (mm)	Wet days	Snow days	Daylight (hours)	Travel score
Jan	18° / 8°	42	10.9	0	15.9	5.6
Feb	18° / 8°	34	8.2	0	14.4	5.9
Mar	16° / 7°	37	9	0	12.5	4.9
Apr	12° / 4°	30	7.4	0	10.4	3.5
May	8° / 1°	26	5.9	0.4	8.7	1.7
Jun	5° / -1°	22	5.8	1.5	7.7	0.1
Jul	5° / -1°	21	5.5	1.5	8.1	0.2
Aug	8° / 0°	21	5.3	1.1	9.6	1.3
Sep	11° / 2°	21	6.1	0.6	11.6	2.7
Oct	14° / 4°	22	6.6	0.2	13.6	4.1
Nov	16° / 6°	31	9.2	0	15.4	4.8
Dec	17° / 7°	48	12.2	0	16.3	5.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 22% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 20% of September, with mostly cloudy or overcast conditions the remaining 58%. Skies tend to cloud over as the month goes on.

	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 (%)	43	44	44	43	43	43	43	43	43	42	43	43	43	43	44	44	43	43	43	42	42	42	42	41	41	40	40	40	40	39
Cloudier (%)	57	56	56	57	57	57	57	57	57	58	57	57	57	57	56	56	57	57	57	58	58	58	58	59	59	60	60	60	60	61

	Clearer (%)	Cloudier (%)
1	43	57
2	44	56
3	44	56
4	43	57
5	43	57
6	43	57
7	43	57
8	43	57
9	43	57
10	42	58
11	43	57
12	43	57
13	43	57
14	43	57
15	44	56
16	44	56
17	43	57
18	43	57
19	43	57
20	42	58
21	42	58
22	42	58
23	42	58
24	41	59
25	41	59
26	40	60
27	40	60
28	40	60
29	40	60
30	39	61

Chance of precipitation in September

Any precipitationSnow

Río Gallegos gets around 21 mm of rain and snow over 6.1 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 20% and peaks near 22% on the wettest days, and about 1 day brings snow.

	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 (%)	18	18	18	18	18	18	18	19	19	20	20	20	20	20	20	20	20	20	20	20	21	21	21	21	21	21	21	21	21	22
Snow chance (%)	3	3	3	2	2	2	2	2	2	2	2	2	2	2	2	2	2	2	2	2	2	2	2	2	2	2	1	1	1	1

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

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 21 km/h in September.

Across September, daily wind ranges from about 21 km/h on the calmest days to 21 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)	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21
Feels	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy

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

Sunrise & sunset in September

DaylightNight

Daylight runs from about 10 h 36 min at the start of September to 12 h 36 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 120 minutes over September. Sunrise moves from 8:19 AM to 7:10 AM, and sunset from 6:55 PM to 7:43 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)	10.6	10.7	10.7	10.8	10.9	10.9	11.0	11.1	11.1	11.2	11.3	11.3	11.4	11.5	11.5	11.6	11.7	11.7	11.8	11.9	11.9	12.0	12.1	12.2	12.2	12.3	12.4	12.4	12.5	12.6
Sunrise (AM)	8:19	8:16	8:14	8:12	8:09	8:07	8:05	8:02	8:00	7:57	7:55	7:53	7:50	7:48	7:45	7:43	7:41	7:38	7:36	7:33	7:31	7:29	7:26	7:24	7:21	7:19	7:17	7:14	7:12	7:10
Sunset (PM)	6:55	6:56	6:58	7:00	7:01	7:03	7:05	7:06	7:08	7:10	7:11	7:13	7:15	7:16	7:18	7:20	7:21	7:23	7:25	7:26	7:28	7:30	7:31	7:33	7:35	7:36	7:38	7:40	7:41	7:43

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	10.6	8:19	6:55
2	10.7	8:16	6:56
3	10.7	8:14	6:58
4	10.8	8:12	7:00
5	10.9	8:09	7:01
6	10.9	8:07	7:03
7	11.0	8:05	7:05
8	11.1	8:02	7:06
9	11.1	8:00	7:08
10	11.2	7:57	7:10
11	11.3	7:55	7:11
12	11.3	7:53	7:13
13	11.4	7:50	7:15
14	11.5	7:48	7:16
15	11.5	7:45	7:18
16	11.6	7:43	7:20
17	11.7	7:41	7:21
18	11.7	7:38	7:23
19	11.8	7:36	7:25
20	11.9	7:33	7:26
21	11.9	7:31	7:28
22	12.0	7:29	7:30
23	12.1	7:26	7:31
24	12.2	7:24	7:33
25	12.2	7:21	7:35
26	12.3	7:19	7:36
27	12.4	7:17	7:38
28	12.4	7:14	7:40
29	12.5	7:12	7:41
30	12.6	7:10	7:43

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 3.12 kWh/m².

For context, solar energy here swings from a low near 0.81 kWh/m² to a high of 6.52 kWh/m² in December across the year — September's 3.12 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)	2.4	2.5	2.5	2.6	2.6	2.6	2.7	2.7	2.8	2.8	2.9	2.9	3.0	3.0	3.1	3.2	3.2	3.3	3.3	3.4	3.4	3.5	3.5	3.6	3.7	3.7	3.8	3.8	3.9	3.9
Level	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate

	Solar energy (kWh/m²)	Level
1	2.4	Moderate
2	2.5	Moderate
3	2.5	Moderate
4	2.6	Moderate
5	2.6	Moderate
6	2.6	Moderate
7	2.7	Moderate
8	2.7	Moderate
9	2.8	Moderate
10	2.8	Moderate
11	2.9	Moderate
12	2.9	Moderate
13	3.0	Moderate
14	3.0	Moderate
15	3.1	Moderate
16	3.2	Moderate
17	3.2	Moderate
18	3.3	Moderate
19	3.3	Moderate
20	3.4	Moderate
21	3.4	Moderate
22	3.5	Moderate
23	3.5	Moderate
24	3.6	Moderate
25	3.7	Moderate
26	3.7	Moderate
27	3.8	Moderate
28	3.8	Moderate
29	3.9	Moderate
30	3.9	Moderate

Planning a trip in September

Is September a good time to visit Río Gallegos?

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

2.7

Sightseeing

8th-best month of the year

0.0

Beach & pool

8th-best month of the year

September is a weaker month for outdoor sightseeing in Río Gallegos.

What to pack for Río Gallegos in September

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

In September, Río Gallegos sees daytime highs around 11°C and nights near 2°C. Pack a warm layer. Worth having: a windbreaker. About 6 days see rain.

a warm layera windbreaker

Sea temperature near Río Gallegos in September

The nearest coast averages about 4°C in September — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 26 km away) is warmest in February at about 11°C and coldest in August near 4°C.

The water stays below 20°C all year — cool enough that most swimmers want a wetsuit.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Sea temperature (°C)	11	11	11	9	8	6	5	4	4	6	8	9
Comfort	Bracing	Bracing	Bracing	Bracing	Bracing	Bracing	Bracing	Bracing	Bracing	Bracing	Bracing	Bracing

	Sea temperature (°C)	Comfort
Jan	11	Bracing
Feb	11	Bracing
Mar	11	Bracing
Apr	9	Bracing
May	8	Bracing
Jun	6	Bracing
Jul	5	Bracing
Aug	4	Bracing
Sep	4	Bracing
Oct	6	Bracing
Nov	8	Bracing
Dec	9	Bracing

UV index in Río Gallegos in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 2. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Río Gallegos peaks around December 22 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near June 20 at about 1 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 6 months of the year.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
UV index (midday)	9	8	4	2	1	1	1	1	2	5	6	9
Level	Very high	Very high	Moderate	Moderate	Low	Low	Low	Low	Moderate	Moderate	High	Very high

	UV index (midday)	Level
Jan	9	Very high
Feb	8	Very high
Mar	4	Moderate
Apr	2	Moderate
May	1	Low
Jun	1	Low
Jul	1	Low
Aug	1	Low
Sep	2	Moderate
Oct	5	Moderate
Nov	6	High
Dec	9	Very high

Location & terrain

Where is Río Gallegos?

Río Gallegos sits at 51.6°S, 69.3°W, 1 m above sea level, in Argentina. The nearest listed city is Punta Arenas, 205 km away.

Topography around Río Gallegos

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

Within 3 km, the terrain around Río Gallegos has only modest variations in elevation — a maximum elevation change of 18 m around an average of 11 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 162 m; within 80 km, significant variations in elevation — a maximum elevation change of 312 m.

The land around Río Gallegos is covered by artificial surfaces (46%) and grassland (32%) within 3 km, grassland (74%) within 16 km, and grassland (70%) and water (23%) within 80 km.

3 km

18 m

artificial surfaces 46%

16 km

162 m

grassland 74%

80 km

312 m

grassland 70%

treesshrubsgrasslandartificial surfacesbare terrainwater

← August Río Gallegos year-round climate October →Best places to visit in September

September weather nearby: Punta Arenas 205 km · Puerto Natales 225 km · El Calafate 255 km · Río Grande 262 km · Ushuaia 360 km · El Chalten 362 km · Puerto Deseado 494 km · Pico Truncado 545 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 Río Gallegos (-51.6253°, -69.2523°, elevation 1 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. Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. 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	9	1
2	9	1
3	9	1
4	9	1
5	9	1
6	9	1
7	10	1
8	10	1
9	10	2
10	10	2
11	10	2
12	10	2
13	10	2
14	10	2
15	10	2
16	11	2
17	11	2
18	11	2
19	11	2
20	11	2
21	11	2
22	11	2
23	12	3
24	12	3
25	12	3
26	12	3
27	12	3
28	12	3
29	12	3
30	12	3

	Clearer (%)	Cloudier (%)
1	43	57
2	44	56
3	44	56
4	43	57
5	43	57
6	43	57
7	43	57
8	43	57
9	43	57
10	42	58
11	43	57
12	43	57
13	43	57
14	43	57
15	44	56
16	44	56
17	43	57
18	43	57
19	43	57
20	42	58
21	42	58
22	42	58
23	42	58
24	41	59
25	41	59
26	40	60
27	40	60
28	40	60
29	40	60
30	39	61

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

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

	Clearer (%)	Cloudier (%)
1	43	57
2	44	56
3	44	56
4	43	57
5	43	57
6	43	57
7	43	57
8	43	57
9	43	57
10	42	58
11	43	57
12	43	57
13	43	57
14	43	57
15	44	56
16	44	56
17	43	57
18	43	57
19	43	57
20	42	58
21	42	58
22	42	58
23	42	58
24	41	59
25	41	59
26	40	60
27	40	60
28	40	60
29	40	60
30	39	61

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

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

	Clearer (%)	Cloudier (%)
1	43	57
2	44	56
3	44	56
4	43	57
5	43	57
6	43	57
7	43	57
8	43	57
9	43	57
10	42	58
11	43	57
12	43	57
13	43	57
14	43	57
15	44	56
16	44	56
17	43	57
18	43	57
19	43	57
20	42	58
21	42	58
22	42	58
23	42	58
24	41	59
25	41	59
26	40	60
27	40	60
28	40	60
29	40	60
30	39	61

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

	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