Trelew weather in September

In September, Trelew sees average daytime highs of 17°C and overnight lows near 6°C, with 18 mm of rain across 4 wet days and about 11.7 hours of daylight. It is the 8th-warmest and 6th-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 43% of the time in September, and the air most often feels dry.

Daylight stretches from about 11 hours at the start of September to 12 h 24 min by month's end. Set against the rest of the year, September is Trelew's 8th-clearest and 6th-windiest month. For the whole year in context, see Trelew's year-round climate.

Daytime high: 17°; 8th warmest
Overnight low: 6°; 4th coldest
Rainfall: 18 mm; 4 wet days
Daylight: 11 h 42 min; 7:24 AM – 7:07 PM
Cloud cover: 47%; 8th clearest
Wind: 18 km/h; 6th windiest
Solar energy: 4.25 kWh/m²
Travel score: 6.2; out of 10

Trelew is city in Argentina.

Density: 393/km²; people per km²
Founded: 1886

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

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

A typical September day in Trelew reaches about 17°C in the afternoon and slips back to 6°C overnight — a 11°C spread between the day's warmth and the night's chill. On most days the high lands between 11°C and 22°C. Set against its neighbours, September runs about 3°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)	15	15	15	16	16	16	16	16	16	16	16	16	16	17	17	17	17	17	17	17	17	17	18	18	18	18	18	18	18	18
Avg low (°C)	5	5	5	5	5	5	5	6	6	6	6	6	6	6	6	6	6	6	6	7	7	7	7	7	7	7	7	7	7	7

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

How September really feels in Trelew

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.

Trelew weather by month

How September compares with the rest of the year at a glance. September is the 8th-warmest and 6th-wettest month here — the current month is highlighted below.

Month	High / Low (°C)	Rainfall (mm)	Wet days	Daylight (hours)	Travel score
Jan	28° / 16°	15	3	14.8	7.9
Feb	27° / 15°	22	3.7	13.8	8.0
Mar	24° / 13°	21	3.5	12.4	8.2
Apr	20° / 10°	19	2.9	10.8	7.6
May	16° / 6°	23	4	9.5	5.6
Jun	12° / 3°	23	4.1	8.9	3.8
Jul	12° / 3°	14	3.5	9.1	3.7
Aug	14° / 4°	14	3.4	10.2	4.9
Sep	17° / 6°	18	4	11.7	6.2
Oct	20° / 9°	18	4.1	13.2	7.4
Nov	23° / 12°	16	3.2	14.5	8.2
Dec	26° / 14°	18	3	15.1	8.1

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 43% 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 37%.

	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 (%)	62	62	63	64	63	64	64	64	65	64	64	64	64	64	65	64	64	64	64	63	63	63	62	62	61	61	60	60	59	59
Cloudier (%)	38	38	37	36	37	36	36	36	35	36	36	36	36	36	35	36	36	36	36	37	37	37	38	38	39	39	40	40	41	41

	Clearer (%)	Cloudier (%)
1	62	38
2	62	38
3	63	37
4	64	36
5	63	37
6	64	36
7	64	36
8	64	36
9	65	35
10	64	36
11	64	36
12	64	36
13	64	36
14	64	36
15	65	35
16	64	36
17	64	36
18	64	36
19	64	36
20	63	37
21	63	37
22	63	37
23	62	38
24	62	38
25	61	39
26	61	39
27	60	40
28	60	40
29	59	41
30	59	41

Chance of precipitation in September

Any precipitation

Trelew gets around 18 mm of rain over 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 13% and peaks near 15% 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 (%)	13	13	13	13	13	14	14	14	14	14	14	14	13	13	13	13	13	13	13	13	13	13	13	13	13	14	14	14	14	15

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

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 18 km/h in September.

Across September, daily wind ranges from about 18 km/h on the calmest days to 18 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)	18	18	18	18	18	18	18	18	18	18	18	18	18	18	18	18	18	18	18	18	18	18	18	18	18	18	18	18	18	18
Feels	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze

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

Sunrise & sunset in September

DaylightNight

Daylight runs from about 11 hours at the start of September to 12 h 24 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 84 minutes over September. Sunrise moves from 7:52 AM to 6:58 AM, and sunset from 6:50 PM to 7:23 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)	11.0	11.0	11.1	11.1	11.2	11.2	11.3	11.3	11.4	11.4	11.5	11.5	11.6	11.6	11.7	11.7	11.8	11.8	11.9	11.9	12.0	12.0	12.1	12.1	12.2	12.2	12.3	12.3	12.4	12.4
Sunrise (AM)	7:52	7:50	7:48	7:47	7:45	7:43	7:41	7:39	7:37	7:36	7:34	7:32	7:30	7:28	7:26	7:24	7:22	7:20	7:19	7:17	7:15	7:13	7:11	7:09	7:07	7:05	7:04	7:02	7:00	6:58
Sunset (PM)	6:50	6:51	6:52	6:53	6:54	6:55	6:57	6:58	6:59	7:00	7:01	7:02	7:03	7:05	7:06	7:07	7:08	7:09	7:10	7:11	7:13	7:14	7:15	7:16	7:17	7:18	7:20	7:21	7:22	7:23

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	11.0	7:52	6:50
2	11.0	7:50	6:51
3	11.1	7:48	6:52
4	11.1	7:47	6:53
5	11.2	7:45	6:54
6	11.2	7:43	6:55
7	11.3	7:41	6:57
8	11.3	7:39	6:58
9	11.4	7:37	6:59
10	11.4	7:36	7:00
11	11.5	7:34	7:01
12	11.5	7:32	7:02
13	11.6	7:30	7:03
14	11.6	7:28	7:05
15	11.7	7:26	7:06
16	11.7	7:24	7:07
17	11.8	7:22	7:08
18	11.8	7:20	7:09
19	11.9	7:19	7:10
20	11.9	7:17	7:11
21	12.0	7:15	7:13
22	12.0	7:13	7:14
23	12.1	7:11	7:15
24	12.1	7:09	7:16
25	12.2	7:07	7:17
26	12.2	7:05	7:18
27	12.3	7:04	7:20
28	12.3	7:02	7:21
29	12.4	7:00	7:22
30	12.4	6:58	7:23

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.25 kWh/m².

For context, solar energy here swings from a low near 1.6 kWh/m² to a high of 8.09 kWh/m² in December across the year — September's 4.25 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)	3.5	3.5	3.6	3.6	3.7	3.7	3.8	3.8	3.9	3.9	4.0	4.0	4.1	4.2	4.2	4.3	4.3	4.4	4.5	4.5	4.6	4.6	4.7	4.7	4.8	4.8	4.9	4.9	5.0	5.0
Level	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	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	3.5	Moderate
2	3.5	Moderate
3	3.6	Moderate
4	3.6	Moderate
5	3.7	Moderate
6	3.7	Moderate
7	3.8	Moderate
8	3.8	Moderate
9	3.9	Moderate
10	3.9	Moderate
11	4.0	Moderate
12	4.0	Bright
13	4.1	Bright
14	4.2	Bright
15	4.2	Bright
16	4.3	Bright
17	4.3	Bright
18	4.4	Bright
19	4.5	Bright
20	4.5	Bright
21	4.6	Bright
22	4.6	Bright
23	4.7	Bright
24	4.7	Bright
25	4.8	Bright
26	4.8	Bright
27	4.9	Bright
28	4.9	Bright
29	5.0	Bright
30	5.0	Bright

Planning a trip in September

Is September a good time to visit Trelew?

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

6.2

Sightseeing

8th-best month of the year

1.3

Beach & pool

8th-best month of the year

September is a reasonable time to visit Trelew for sightseeing.

What to pack for Trelew in September

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

In September, Trelew sees daytime highs around 17°C and nights near 6°C. Worth packing: a warm layer. About 4 days see rain.

a warm layer

Sea temperature near Trelew in September

The nearest coast averages about 9°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 38 km away) is warmest in February at about 17°C and coldest in August near 9°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)	17	17	17	15	13	12	10	9	9	11	13	15
Comfort	Cool	Cool	Cool	Cool	Bracing	Bracing	Bracing	Bracing	Bracing	Bracing	Bracing	Bracing

	Sea temperature (°C)	Comfort
Jan	17	Cool
Feb	17	Cool
Mar	17	Cool
Apr	15	Cool
May	13	Bracing
Jun	12	Bracing
Jul	10	Bracing
Aug	9	Bracing
Sep	9	Bracing
Oct	11	Bracing
Nov	13	Bracing
Dec	15	Bracing

UV index in Trelew in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 4 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Trelew peaks around December 22 at about 12 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 19 at about 1 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 8 months of the year.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
UV index (midday)	11	10	7	4	2	1	2	2	4	7	9	12
Level	Extreme	Extreme	High	Moderate	Moderate	Low	Low	Moderate	Moderate	High	Very high	Extreme

	UV index (midday)	Level
Jan	11	Extreme
Feb	10	Extreme
Mar	7	High
Apr	4	Moderate
May	2	Moderate
Jun	1	Low
Jul	2	Low
Aug	2	Moderate
Sep	4	Moderate
Oct	7	High
Nov	9	Very high
Dec	12	Extreme

Location & terrain

Where is Trelew?

Trelew sits at 43.2°S, 65.3°W, 14 m above sea level, in Argentina. The nearest listed city is Rawson, 17 km away.

Topography around Trelew

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

Within 3 km, the terrain around Trelew has only modest variations in elevation — a maximum elevation change of 35 m around an average of 19 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 205 m; within 80 km, significant variations in elevation — a maximum elevation change of 336 m.

The land around Trelew is covered by artificial surfaces (51%), grassland (22%) and shrubs (20%) within 3 km, shrubs (67%) and grassland (20%) within 16 km, and shrubs (65%) and water (25%) within 80 km.

3 km

35 m

artificial surfaces 51%

16 km

205 m

shrubs 67%

80 km

336 m

shrubs 65%

treesshrubsgrasslandcroplandartificial surfacesbare terrainwater

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

September weather nearby: Rawson 17 km · Puerto Madryn 58 km · San Antonio Oeste 281 km · Viedma 331 km · Carmen de Patagones 333 km · Comodoro Rivadavia 338 km · Caleta Olivia 396 km · Pico Truncado 446 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 Trelew (-43.249°, -65.305°, elevation 14 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	15	5
2	15	5
3	15	5
4	16	5
5	16	5
6	16	5
7	16	5
8	16	6
9	16	6
10	16	6
11	16	6
12	16	6
13	16	6
14	17	6
15	17	6
16	17	6
17	17	6
18	17	6
19	17	6
20	17	7
21	17	7
22	17	7
23	18	7
24	18	7
25	18	7
26	18	7
27	18	7
28	18	7
29	18	7
30	18	7

	Clearer (%)	Cloudier (%)
1	62	38
2	62	38
3	63	37
4	64	36
5	63	37
6	64	36
7	64	36
8	64	36
9	65	35
10	64	36
11	64	36
12	64	36
13	64	36
14	64	36
15	65	35
16	64	36
17	64	36
18	64	36
19	64	36
20	63	37
21	63	37
22	63	37
23	62	38
24	62	38
25	61	39
26	61	39
27	60	40
28	60	40
29	59	41
30	59	41

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

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

	Clearer (%)	Cloudier (%)
1	62	38
2	62	38
3	63	37
4	64	36
5	63	37
6	64	36
7	64	36
8	64	36
9	65	35
10	64	36
11	64	36
12	64	36
13	64	36
14	64	36
15	65	35
16	64	36
17	64	36
18	64	36
19	64	36
20	63	37
21	63	37
22	63	37
23	62	38
24	62	38
25	61	39
26	61	39
27	60	40
28	60	40
29	59	41
30	59	41

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

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

	Clearer (%)	Cloudier (%)
1	62	38
2	62	38
3	63	37
4	64	36
5	63	37
6	64	36
7	64	36
8	64	36
9	65	35
10	64	36
11	64	36
12	64	36
13	64	36
14	64	36
15	65	35
16	64	36
17	64	36
18	64	36
19	64	36
20	63	37
21	63	37
22	63	37
23	62	38
24	62	38
25	61	39
26	61	39
27	60	40
28	60	40
29	59	41
30	59	41

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

	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