Bahía Blanca weather in September

In September, Bahía Blanca sees average daytime highs of 16°C and overnight lows near 8°C, with 45 mm of rain across 6.2 wet days and about 11.7 hours of daylight. It is the 8th-warmest and 8th-wettest month of the year here.

Highs climb over the month, from about 15°C in the first days to 17°C by the end. The sky is clear or mostly clear about 41% of the time in September, and the air most often feels dry.

Daylight stretches from about 11 h 06 min at the start of September to 12 h 24 min by month's end. Set against the rest of the year, September is Bahía Blanca's 8th-clearest and 9th-windiest month. For the whole year in context, see Bahía Blanca's year-round climate.

Daytime high: 16°; 8th warmest
Overnight low: 8°; 4th coldest
Rainfall: 45 mm; 6.2 wet days
Daylight: 11 h 48 min; 7:11 AM – 6:56 PM
Cloud cover: 51%; 8th clearest
Wind: 18 km/h; 9th windiest
Solar energy: 4.4 kWh/m²
Travel score: 5.7; out of 10

Bahía Blanca is city in Argentina.

Density: 2,301/km²; people per km²
Founded: 1828

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

← August Bahía Blanca 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 17°C by the end.

A typical September day in Bahía Blanca reaches about 16°C in the afternoon and slips back to 8°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 11°C and 21°C. Set against its neighbours, September runs about 2°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)	15	15	15	15	15	15	16	16	16	16	16	16	16	16	16	16	16	17	17	17	17	17	17	17	17	17	17	17	17	18
Avg low (°C)	7	7	7	7	7	7	7	8	8	8	8	8	8	8	8	8	8	8	8	8	8	9	9	9	9	9	9	9	9	9

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

Bahía Blanca weather by month

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

Month	High / Low (°C)	Rainfall (mm)	Wet days	Daylight (hours)	Travel score
Jan	28° / 18°	54	7.1	14.4	7.3
Feb	27° / 18°	65	6.7	13.5	7.4
Mar	24° / 16°	67	6.7	12.3	7.7
Apr	20° / 12°	55	6	11	7.1
May	16° / 9°	38	5.4	9.9	5.6
Jun	13° / 6°	28	4.4	9.3	4.1
Jul	12° / 5°	34	5	9.6	3.7
Aug	14° / 6°	35	4.8	10.5	4.7
Sep	16° / 8°	45	6.2	11.7	5.7
Oct	19° / 11°	64	7.8	13	6.7
Nov	23° / 14°	63	7	14.1	7.6
Dec	26° / 17°	57	6.2	14.7	7.6

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 41% 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 45%.

	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 (%)	53	53	53	54	53	54	54	54	55	55	55	56	56	56	56	57	57	57	56	56	56	55	55	55	55	55	54	54	54	53
Cloudier (%)	47	47	47	46	47	46	46	46	45	45	45	44	44	44	44	43	43	43	44	44	44	45	45	45	45	45	46	46	46	47

	Clearer (%)	Cloudier (%)
1	53	47
2	53	47
3	53	47
4	54	46
5	53	47
6	54	46
7	54	46
8	54	46
9	55	45
10	55	45
11	55	45
12	56	44
13	56	44
14	56	44
15	56	44
16	57	43
17	57	43
18	57	43
19	56	44
20	56	44
21	56	44
22	55	45
23	55	45
24	55	45
25	55	45
26	55	45
27	54	46
28	54	46
29	54	46
30	53	47

Chance of precipitation in September

Any precipitation

Bahía Blanca gets around 45 mm of rain over 6.2 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 21% and peaks near 26% on the wettest days. The odds climb toward the end of the month.

	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 (%)	17	17	17	18	18	18	19	19	20	20	20	20	20	20	20	20	20	20	21	21	21	21	22	22	23	24	24	25	25	26

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

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 99% 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 (%)	99	99	99	99	99	99	99	99	99	99	99	99	99	99	99	99	99	99	99	100	100	100	99	99	99	99	99	99	99	98
Comfortable (%)	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	0	0	0	1	1	1	1	1	1	1	2

	Dry (%)	Comfortable (%)
1	99	1
2	99	1
3	99	1
4	99	1
5	99	1
6	99	1
7	99	1
8	99	1
9	99	1
10	99	1
11	99	1
12	99	1
13	99	1
14	99	1
15	99	1
16	99	1
17	99	1
18	99	1
19	99	1
20	100	0
21	100	0
22	100	0
23	99	1
24	99	1
25	99	1
26	99	1
27	99	1
28	99	1
29	99	1
30	98	2

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 h 06 min 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 78 minutes over September. Sunrise moves from 7:35 AM to 6:48 AM, and sunset from 6:42 PM to 7:09 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)	11.1	11.2	11.2	11.2	11.3	11.3	11.4	11.4	11.5	11.5	11.5	11.6	11.6	11.7	11.7	11.8	11.8	11.8	11.9	11.9	12.0	12.0	12.1	12.1	12.1	12.2	12.2	12.3	12.3	12.4
Sunrise (AM)	7:35	7:34	7:32	7:31	7:29	7:27	7:26	7:24	7:22	7:21	7:19	7:17	7:16	7:14	7:12	7:11	7:09	7:07	7:06	7:04	7:03	7:01	6:59	6:58	6:56	6:54	6:53	6:51	6:49	6:48
Sunset (PM)	6:42	6:43	6:44	6:45	6:46	6:47	6:48	6:49	6:50	6:50	6:51	6:52	6:53	6:54	6:55	6:56	6:57	6:58	6:59	7:00	7:01	7:01	7:02	7:03	7:04	7:05	7:06	7:07	7:08	7:09

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	11.1	7:35	6:42
2	11.2	7:34	6:43
3	11.2	7:32	6:44
4	11.2	7:31	6:45
5	11.3	7:29	6:46
6	11.3	7:27	6:47
7	11.4	7:26	6:48
8	11.4	7:24	6:49
9	11.5	7:22	6:50
10	11.5	7:21	6:50
11	11.5	7:19	6:51
12	11.6	7:17	6:52
13	11.6	7:16	6:53
14	11.7	7:14	6:54
15	11.7	7:12	6:55
16	11.8	7:11	6:56
17	11.8	7:09	6:57
18	11.8	7:07	6:58
19	11.9	7:06	6:59
20	11.9	7:04	7:00
21	12.0	7:03	7:01
22	12.0	7:01	7:01
23	12.1	6:59	7:02
24	12.1	6:58	7:03
25	12.1	6:56	7:04
26	12.2	6:54	7:05
27	12.2	6:53	7:06
28	12.3	6:51	7:07
29	12.3	6:49	7:08
30	12.4	6:48	7:09

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.4 kWh/m².

For context, solar energy here swings from a low near 1.98 kWh/m² to a high of 7.89 kWh/m² in December across the year — September's 4.4 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)	3.8	3.8	3.8	3.9	3.9	4.0	4.0	4.1	4.1	4.2	4.2	4.3	4.3	4.4	4.4	4.5	4.5	4.5	4.6	4.6	4.7	4.7	4.7	4.8	4.8	4.8	4.8	4.9	4.9	5.0
Level	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	Bright	Bright	Bright	Bright	Bright

	Solar energy (kWh/m²)	Level
1	3.8	Moderate
2	3.8	Moderate
3	3.8	Moderate
4	3.9	Moderate
5	3.9	Moderate
6	4.0	Moderate
7	4.0	Bright
8	4.1	Bright
9	4.1	Bright
10	4.2	Bright
11	4.2	Bright
12	4.3	Bright
13	4.3	Bright
14	4.4	Bright
15	4.4	Bright
16	4.5	Bright
17	4.5	Bright
18	4.5	Bright
19	4.6	Bright
20	4.6	Bright
21	4.7	Bright
22	4.7	Bright
23	4.7	Bright
24	4.8	Bright
25	4.8	Bright
26	4.8	Bright
27	4.8	Bright
28	4.9	Bright
29	4.9	Bright
30	5.0	Bright

Planning a trip in September

Is September a good time to visit Bahía Blanca?

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

5.7

Sightseeing

8th-best month of the year

0.9

Beach & pool

8th-best month of the year

September is a reasonable time to visit Bahía Blanca for sightseeing.

What to pack for Bahía Blanca in September

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

In September, Bahía Blanca sees daytime highs around 16°C and nights near 8°C. Worth packing: a warm layer. About 6 days see rain.

a warm layer

Sea temperature near Bahía Blanca in September

The nearest coast averages about 11°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 21 km away) is warmest in January at about 22°C and coldest in August near 9°C.

It's comfortable for a long swim from Dec 8 to Mar 20 — about 3.4 months when the water holds above 20°C.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Sea temperature (°C)	22	22	21	17	14	11	9	9	11	15	18	21
Comfort	Refreshing	Refreshing	Refreshing	Cool	Bracing	Bracing	Bracing	Bracing	Bracing	Bracing	Cool	Refreshing

	Sea temperature (°C)	Comfort
Jan	22	Refreshing
Feb	22	Refreshing
Mar	21	Refreshing
Apr	17	Cool
May	14	Bracing
Jun	11	Bracing
Jul	9	Bracing
Aug	9	Bracing
Sep	11	Bracing
Oct	15	Bracing
Nov	18	Cool
Dec	21	Refreshing

UV index in Bahía Blanca in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 5 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Bahía Blanca peaks around December 20 at about 12 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 21 at about 2 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 9 months of the year.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
UV index (midday)	12	11	8	6	3	2	2	3	5	7	10	13
Level	Extreme	Extreme	Very high	High	Moderate	Low	Moderate	Moderate	Moderate	Very high	Extreme	Extreme

	UV index (midday)	Level
Jan	12	Extreme
Feb	11	Extreme
Mar	8	Very high
Apr	6	High
May	3	Moderate
Jun	2	Low
Jul	2	Moderate
Aug	3	Moderate
Sep	5	Moderate
Oct	7	Very high
Nov	10	Extreme
Dec	13	Extreme

Location & terrain

Where is Bahía Blanca?

Bahía Blanca sits at 38.7°S, 62.3°W, 20 m above sea level, in Argentina. The nearest listed city is Punta Alta, 25 km away.

Topography around Bahía Blanca

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

Within 3 km, the terrain around Bahía Blanca has only modest variations in elevation — a maximum elevation change of 67 m around an average of 26 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 110 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,244 m.

The land around Bahía Blanca is covered by artificial surfaces (80%) within 3 km, grassland (33%) and cropland (23%) within 16 km, and cropland (39%) and grassland (37%) within 80 km.

3 km

67 m

artificial surfaces 80%

16 km

110 m

grassland 33%

80 km

1,244 m

cropland 39%

treesshrubsgrasslandcroplandartificial surfacesbare terrainwaterwetland

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

September weather nearby: Punta Alta 25 km · Coronel Pringles 114 km · Pigüé 125 km · Coronel Suárez 143 km · Río Colorado 161 km · Tres Arroyos 177 km · Carmen de Patagones 240 km · Viedma 242 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 Bahía Blanca (-38.7176°, -62.2655°, elevation 20 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	7
2	15	7
3	15	7
4	15	7
5	15	7
6	15	7
7	16	7
8	16	8
9	16	8
10	16	8
11	16	8
12	16	8
13	16	8
14	16	8
15	16	8
16	16	8
17	16	8
18	17	8
19	17	8
20	17	8
21	17	8
22	17	9
23	17	9
24	17	9
25	17	9
26	17	9
27	17	9
28	17	9
29	17	9
30	18	9

	Clearer (%)	Cloudier (%)
1	53	47
2	53	47
3	53	47
4	54	46
5	53	47
6	54	46
7	54	46
8	54	46
9	55	45
10	55	45
11	55	45
12	56	44
13	56	44
14	56	44
15	56	44
16	57	43
17	57	43
18	57	43
19	56	44
20	56	44
21	56	44
22	55	45
23	55	45
24	55	45
25	55	45
26	55	45
27	54	46
28	54	46
29	54	46
30	53	47

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

	Dry (%)	Comfortable (%)
1	99	1
2	99	1
3	99	1
4	99	1
5	99	1
6	99	1
7	99	1
8	99	1
9	99	1
10	99	1
11	99	1
12	99	1
13	99	1
14	99	1
15	99	1
16	99	1
17	99	1
18	99	1
19	99	1
20	100	0
21	100	0
22	100	0
23	99	1
24	99	1
25	99	1
26	99	1
27	99	1
28	99	1
29	99	1
30	98	2

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

	Clearer (%)	Cloudier (%)
1	53	47
2	53	47
3	53	47
4	54	46
5	53	47
6	54	46
7	54	46
8	54	46
9	55	45
10	55	45
11	55	45
12	56	44
13	56	44
14	56	44
15	56	44
16	57	43
17	57	43
18	57	43
19	56	44
20	56	44
21	56	44
22	55	45
23	55	45
24	55	45
25	55	45
26	55	45
27	54	46
28	54	46
29	54	46
30	53	47

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

	Dry (%)	Comfortable (%)
1	99	1
2	99	1
3	99	1
4	99	1
5	99	1
6	99	1
7	99	1
8	99	1
9	99	1
10	99	1
11	99	1
12	99	1
13	99	1
14	99	1
15	99	1
16	99	1
17	99	1
18	99	1
19	99	1
20	100	0
21	100	0
22	100	0
23	99	1
24	99	1
25	99	1
26	99	1
27	99	1
28	99	1
29	99	1
30	98	2

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

	Clearer (%)	Cloudier (%)
1	53	47
2	53	47
3	53	47
4	54	46
5	53	47
6	54	46
7	54	46
8	54	46
9	55	45
10	55	45
11	55	45
12	56	44
13	56	44
14	56	44
15	56	44
16	57	43
17	57	43
18	57	43
19	56	44
20	56	44
21	56	44
22	55	45
23	55	45
24	55	45
25	55	45
26	55	45
27	54	46
28	54	46
29	54	46
30	53	47

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

	Dry (%)	Comfortable (%)
1	99	1
2	99	1
3	99	1
4	99	1
5	99	1
6	99	1
7	99	1
8	99	1
9	99	1
10	99	1
11	99	1
12	99	1
13	99	1
14	99	1
15	99	1
16	99	1
17	99	1
18	99	1
19	99	1
20	100	0
21	100	0
22	100	0
23	99	1
24	99	1
25	99	1
26	99	1
27	99	1
28	99	1
29	99	1
30	98	2