San Justo weather in September

In September, San Justo sees average daytime highs of 23°C and overnight lows near 11°C, with 70 mm of rain across 6.3 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 22°C in the first days to 24°C by the end. The sky is clear or mostly clear about 51% 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 San Justo's 3rd-clearest and 1st-windiest month. For the whole year in context, see San Justo's year-round climate.

Daytime high: 23°; 8th warmest
Overnight low: 11°; 4th coldest
Rainfall: 70 mm; 6.3 wet days
Daylight: 11 h 48 min; 7:02 AM – 6:51 PM
Cloud cover: 44%; 3rd clearest
Wind: 14 km/h; 1st windiest
Solar energy: 4.84 kWh/m²
Travel score: 7.6; out of 10

← August San Justo 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 22°C in the first days to 24°C by the end.

A typical September day in San Justo reaches about 23°C in the afternoon and slips back to 11°C overnight — a 12°C spread between the day's warmth and the night's chill. On most days the high lands between 16°C and 29°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)	22	22	22	22	22	22	22	22	22	22	22	22	23	23	23	23	23	23	23	23	23	23	23	23	24	24	24	24	24	24
Avg low (°C)	11	11	11	11	11	11	11	11	11	11	11	11	11	11	11	11	11	11	11	11	12	12	12	12	12	12	12	12	12	13

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

How September really feels in San Justo

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.

San Justo 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.

Month	High / Low (°C)	Rainfall (mm)	Wet days	Daylight (hours)	Travel score
Jan	31° / 20°	125	9.6	13.8	4.6
Feb	30° / 20°	124	8.7	13.1	5.2
Mar	28° / 18°	126	8.9	12.2	6.3
Apr	25° / 15°	132	8.9	11.3	7.2
May	21° / 12°	78	6.2	10.5	7.1
Jun	18° / 9°	49	5.2	10	6.7
Jul	18° / 8°	37	4.3	10.2	6.9
Aug	21° / 9°	56	4.7	10.9	7.5
Sep	23° / 11°	70	6.3	11.8	7.6
Oct	25° / 14°	137	9.2	12.8	7.1
Nov	28° / 16°	125	8.1	13.6	6.6
Dec	30° / 19°	134	8.9	14	5.3

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 51% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 12% 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	61	61	61	61	61	60	61	62	62	63	64	64	65	65	66	66	66	67	67	66	65	65	64	62	62	61	61	59	59
Cloudier (%)	38	39	39	39	39	39	40	39	38	38	37	36	36	35	35	34	34	34	33	33	34	35	35	36	38	38	39	39	41	41

	Clearer (%)	Cloudier (%)
1	62	38
2	61	39
3	61	39
4	61	39
5	61	39
6	61	39
7	60	40
8	61	39
9	62	38
10	62	38
11	63	37
12	64	36
13	64	36
14	65	35
15	65	35
16	66	34
17	66	34
18	66	34
19	67	33
20	67	33
21	66	34
22	65	35
23	65	35
24	64	36
25	62	38
26	62	38
27	61	39
28	61	39
29	59	41
30	59	41

Chance of precipitation in September

Any precipitation

San Justo gets around 70 mm of rain over 6.3 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.

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

	Rain chance (%)
1	19
2	20
3	20
4	21
5	21
6	21
7	22
8	22
9	21
10	21
11	21
12	20
13	20
14	20
15	20
16	19
17	19
18	19
19	19
20	19
21	20
22	20
23	21
24	21
25	22
26	23
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 71% 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 (%)	72	72	71	71	71	73	73	72	73	73	74	73	73	74	74	74	74	74	74	73	73	71	69	68	66	66	64	64	62	62
Comfortable (%)	16	16	17	17	17	16	16	16	16	16	16	16	16	16	16	16	16	16	16	17	17	18	19	19	20	20	21	21	21	21
Humid (%)	10	10	10	10	10	9	9	9	8	8	7	7	7	6	6	6	6	6	6	6	6	7	8	8	9	9	10	10	11	11
Muggy (%)	2	2	2	2	2	2	2	3	3	3	3	4	4	4	4	4	4	4	4	4	4	4	4	5	5	5	5	5	6	6

	Dry (%)	Comfortable (%)	Humid (%)	Muggy (%)
1	72	16	10	2
2	72	16	10	2
3	71	17	10	2
4	71	17	10	2
5	71	17	10	2
6	73	16	9	2
7	73	16	9	2
8	72	16	9	3
9	73	16	8	3
10	73	16	8	3
11	74	16	7	3
12	73	16	7	4
13	73	16	7	4
14	74	16	6	4
15	74	16	6	4
16	74	16	6	4
17	74	16	6	4
18	74	16	6	4
19	74	16	6	4
20	73	17	6	4
21	73	17	6	4
22	71	18	7	4
23	69	19	8	4
24	68	19	8	5
25	66	20	9	5
26	66	20	9	5
27	64	21	10	5
28	64	21	10	5
29	62	21	11	6
30	62	21	11	6

Wind in September

Winds average 14 km/h in September, the windiest month of the year.

Across September, daily wind ranges from about 14 km/h on the calmest days to 14 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)	14	14	14	14	14	14	14	14	14	14	14	14	14	14	14	14	14	14	14	14	14	14	14	14	14	14	14	14	14	14
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	14	light breeze
2	14	light breeze
3	14	light breeze
4	14	light breeze
5	14	light breeze
6	14	light breeze
7	14	light breeze
8	14	light breeze
9	14	light breeze
10	14	light breeze
11	14	light breeze
12	14	light breeze
13	14	light breeze
14	14	light breeze
15	14	light breeze
16	14	light breeze
17	14	light breeze
18	14	light breeze
19	14	light breeze
20	14	light breeze
21	14	light breeze
22	14	light breeze
23	14	light breeze
24	14	light breeze
25	14	light breeze
26	14	light breeze
27	14	light breeze
28	14	light breeze
29	14	light breeze
30	14	light breeze

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 7:22 AM to 6:44 AM, and sunset from 6:42 PM to 7:00 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)	11.3	11.4	11.4	11.4	11.5	11.5	11.5	11.6	11.6	11.6	11.7	11.7	11.7	11.8	11.8	11.8	11.8	11.9	11.9	11.9	12.0	12.0	12.0	12.1	12.1	12.1	12.2	12.2	12.2	12.3
Sunrise (AM)	7:22	7:21	7:19	7:18	7:17	7:15	7:14	7:13	7:11	7:10	7:09	7:08	7:06	7:05	7:04	7:02	7:01	7:00	6:58	6:57	6:56	6:54	6:53	6:52	6:50	6:49	6:48	6:46	6:45	6:44
Sunset (PM)	6:42	6:43	6:44	6:44	6:45	6:45	6:46	6:46	6:47	6:48	6:48	6:49	6:49	6:50	6:51	6:51	6:52	6:52	6:53	6:54	6:54	6:55	6:55	6:56	6:57	6:57	6:58	6:58	6:59	7:00

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

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.84 kWh/m².

For context, solar energy here swings from a low near 2.5 kWh/m² to a high of 7.16 kWh/m² in December across the year — September's 4.84 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)	4.3	4.3	4.3	4.3	4.4	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	5.0	5.1	5.1	5.1	5.1	5.2	5.2	5.2	5.2	5.2	5.2	5.2
Level	Bright	Bright	Bright	Bright	Bright	Bright	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	4.3	Bright
2	4.3	Bright
3	4.3	Bright
4	4.3	Bright
5	4.4	Bright
6	4.4	Bright
7	4.5	Bright
8	4.5	Bright
9	4.6	Bright
10	4.6	Bright
11	4.7	Bright
12	4.7	Bright
13	4.8	Bright
14	4.8	Bright
15	4.9	Bright
16	4.9	Bright
17	5.0	Bright
18	5.0	Bright
19	5.0	Bright
20	5.1	Bright
21	5.1	Bright
22	5.1	Bright
23	5.1	Bright
24	5.2	Bright
25	5.2	Bright
26	5.2	Bright
27	5.2	Bright
28	5.2	Bright
29	5.2	Bright
30	5.2	Bright

Planning a trip in September

Is September a good time to visit San Justo?

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

7.6

Sightseeing

1st-best month of the year

5.8

Beach & pool

8th-best month of the year

September is one of the better times to visit San Justo for general sightseeing.

What to pack for San Justo in September

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

In September, San Justo sees daytime highs around 23°C and nights near 11°C. Worth packing: light clothes and sun protection. About 6 days see rain.

light clothessun protection

UV index in San Justo 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 San Justo peaks around January 18 at about 14 (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 — every month of the year.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
UV index (midday)	14	13	10	7	4	3	4	5	7	9	11	13
Level	Extreme	Extreme	Extreme	High	Moderate	Moderate	Moderate	Moderate	High	Very high	Extreme	Extreme

	UV index (midday)	Level
Jan	14	Extreme
Feb	13	Extreme
Mar	10	Extreme
Apr	7	High
May	4	Moderate
Jun	3	Moderate
Jul	4	Moderate
Aug	5	Moderate
Sep	7	High
Oct	9	Very high
Nov	11	Extreme
Dec	13	Extreme

Location & terrain

Where is San Justo?

San Justo sits at 30.8°S, 60.6°W, 49 m above sea level, in Argentina. The nearest listed city is San Javier, 68 km away.

Topography around San Justo

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

Within 3 km, the terrain around San Justo has only modest variations in elevation — a maximum elevation change of 26 m around an average of 52 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 49 m; within 80 km, only modest variations in elevation — a maximum elevation change of 79 m.

The land around San Justo is covered by cropland (55%) and grassland (23%) within 3 km, cropland (72%) and grassland (20%) within 16 km, and cropland (41%) and grassland (30%) within 80 km.

3 km

26 m

cropland 55%

16 km

49 m

cropland 72%

80 km

79 m

cropland 41%

treesshrubsgrasslandcroplandartificial surfaceswaterwetland

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

September weather nearby: San Javier 68 km · Santa Elena 79 km · Esperanza 80 km · La Paz 91 km · Sunchales 94 km · Santa Fe 96 km · Santo Tomé 98 km · Rafaela 100 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 San Justo (-30.7899°, -60.5928°, elevation 49 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).

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

	Clearer (%)	Cloudier (%)
1	62	38
2	61	39
3	61	39
4	61	39
5	61	39
6	61	39
7	60	40
8	61	39
9	62	38
10	62	38
11	63	37
12	64	36
13	64	36
14	65	35
15	65	35
16	66	34
17	66	34
18	66	34
19	67	33
20	67	33
21	66	34
22	65	35
23	65	35
24	64	36
25	62	38
26	62	38
27	61	39
28	61	39
29	59	41
30	59	41

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

	Dry (%)	Comfortable (%)	Humid (%)	Muggy (%)
1	72	16	10	2
2	72	16	10	2
3	71	17	10	2
4	71	17	10	2
5	71	17	10	2
6	73	16	9	2
7	73	16	9	2
8	72	16	9	3
9	73	16	8	3
10	73	16	8	3
11	74	16	7	3
12	73	16	7	4
13	73	16	7	4
14	74	16	6	4
15	74	16	6	4
16	74	16	6	4
17	74	16	6	4
18	74	16	6	4
19	74	16	6	4
20	73	17	6	4
21	73	17	6	4
22	71	18	7	4
23	69	19	8	4
24	68	19	8	5
25	66	20	9	5
26	66	20	9	5
27	64	21	10	5
28	64	21	10	5
29	62	21	11	6
30	62	21	11	6

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

	Clearer (%)	Cloudier (%)
1	62	38
2	61	39
3	61	39
4	61	39
5	61	39
6	61	39
7	60	40
8	61	39
9	62	38
10	62	38
11	63	37
12	64	36
13	64	36
14	65	35
15	65	35
16	66	34
17	66	34
18	66	34
19	67	33
20	67	33
21	66	34
22	65	35
23	65	35
24	64	36
25	62	38
26	62	38
27	61	39
28	61	39
29	59	41
30	59	41

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

	Dry (%)	Comfortable (%)	Humid (%)	Muggy (%)
1	72	16	10	2
2	72	16	10	2
3	71	17	10	2
4	71	17	10	2
5	71	17	10	2
6	73	16	9	2
7	73	16	9	2
8	72	16	9	3
9	73	16	8	3
10	73	16	8	3
11	74	16	7	3
12	73	16	7	4
13	73	16	7	4
14	74	16	6	4
15	74	16	6	4
16	74	16	6	4
17	74	16	6	4
18	74	16	6	4
19	74	16	6	4
20	73	17	6	4
21	73	17	6	4
22	71	18	7	4
23	69	19	8	4
24	68	19	8	5
25	66	20	9	5
26	66	20	9	5
27	64	21	10	5
28	64	21	10	5
29	62	21	11	6
30	62	21	11	6

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

	Clearer (%)	Cloudier (%)
1	62	38
2	61	39
3	61	39
4	61	39
5	61	39
6	61	39
7	60	40
8	61	39
9	62	38
10	62	38
11	63	37
12	64	36
13	64	36
14	65	35
15	65	35
16	66	34
17	66	34
18	66	34
19	67	33
20	67	33
21	66	34
22	65	35
23	65	35
24	64	36
25	62	38
26	62	38
27	61	39
28	61	39
29	59	41
30	59	41

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

	Dry (%)	Comfortable (%)	Humid (%)	Muggy (%)
1	72	16	10	2
2	72	16	10	2
3	71	17	10	2
4	71	17	10	2
5	71	17	10	2
6	73	16	9	2
7	73	16	9	2
8	72	16	9	3
9	73	16	8	3
10	73	16	8	3
11	74	16	7	3
12	73	16	7	4
13	73	16	7	4
14	74	16	6	4
15	74	16	6	4
16	74	16	6	4
17	74	16	6	4
18	74	16	6	4
19	74	16	6	4
20	73	17	6	4
21	73	17	6	4
22	71	18	7	4
23	69	19	8	4
24	68	19	8	5
25	66	20	9	5
26	66	20	9	5
27	64	21	10	5
28	64	21	10	5
29	62	21	11	6
30	62	21	11	6