San Juan weather in August

In August, San Juan sees average daytime highs of 20°C and overnight lows near 5°C, with 10 mm of precipitation across 2.3 wet days and about 10.8 hours of daylight. It is the 10th-warmest and 10th-wettest month of the year here.

Highs climb over the month, from about 18°C in the first days to 21°C by the end. The sky is clear or mostly clear about 74% of the time in August, and the air most often feels dry.

Daylight stretches from about 10 h 24 min at the start of August to 11 h 18 min by month's end. Set against the rest of the year, August is San Juan's 1st-clearest and 5th-windiest month. For the whole year in context, see San Juan's year-round climate.

Daytime high: 20°; 10th warmest
Overnight low: 5°; 3rd coldest
Precipitation: 10 mm; 2.3 wet days
Daylight: 10 h 48 min; 8:13 AM – 7:03 PM
Cloud cover: 25%; 1st clearest
Wind: 9 km/h; 5th windiest
Solar energy: 4.56 kWh/m²
Travel score: 8.1; out of 10

San Juan is capital of San Juan Province, Argentina.

Density: 3,637/km²; people per km²
Founded: 1562

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

← July San Juan year-round climate September →Best places to visit in August

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Temperature in August

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 18°C in the first days to 21°C by the end.

A typical August day in San Juan reaches about 20°C in the afternoon and slips back to 5°C overnight — a 15°C spread between the day's warmth and the night's chill. On most days the high lands between 13°C and 27°C. Set against its neighbours, August runs about 3°C warmer than July and about 3°C cooler than September.

	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	31
Avg high (°C)	18	18	18	18	19	19	19	19	19	19	19	19	20	20	20	20	20	20	20	21	21	21	21	21	21	21	21	21	21	21	21
Avg low (°C)	3	3	3	3	3	3	4	4	4	4	4	4	4	4	4	5	5	5	5	5	5	5	6	6	6	6	6	6	6	6	7

	Avg high (°C)	Avg low (°C)
1	18	3
2	18	3
3	18	3
4	18	3
5	19	3
6	19	3
7	19	4
8	19	4
9	19	4
10	19	4
11	19	4
12	19	4
13	20	4
14	20	4
15	20	4
16	20	5
17	20	5
18	20	5
19	20	5
20	21	5
21	21	5
22	21	5
23	21	6
24	21	6
25	21	6
26	21	6
27	21	6
28	21	6
29	21	6
30	21	6
31	21	7

How August really feels in San Juan

Once humidity and wind are folded in, August 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

August sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

San Juan weather by month

How August compares with the rest of the year at a glance. August is the 10th-warmest and 10th-wettest month here — the current month is highlighted below.

Month	High / Low (°C)	Rainfall (mm)	Wet days	Daylight (hours)	Travel score
Jan	33° / 19°	17	3.2	13.8	4.6
Feb	31° / 18°	20	3.4	13.2	5.3
Mar	29° / 16°	24	3.9	12.2	6.9
Apr	24° / 11°	18	3.3	11.3	8.4
May	20° / 7°	11	2.6	10.4	7.8
Jun	18° / 3°	8	2	10	7.2
Jul	17° / 2°	8	2.2	10.2	7.0
Aug	20° / 5°	10	2.3	10.8	8.1
Sep	23° / 9°	18	3.3	11.8	8.5
Oct	26° / 12°	21	3.5	12.8	8.2
Nov	29° / 15°	16	3.2	13.6	6.7
Dec	32° / 18°	22	3.3	14	5.2

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 74% of the time in August, the clearest month of the year.

Beyond those clear spells, partly cloudy skies cover about 9% of August, with mostly cloudy or overcast conditions the remaining 17%.

	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	31
Clearer (%)	85	84	84	84	84	84	84	84	84	83	83	83	83	83	83	83	82	82	82	82	82	82	82	82	82	82	82	82	82	82	82
Cloudier (%)	15	16	16	16	16	16	16	16	16	17	17	17	17	17	17	17	18	18	18	18	18	18	18	18	18	18	18	18	18	18	18

	Clearer (%)	Cloudier (%)
1	85	15
2	84	16
3	84	16
4	84	16
5	84	16
6	84	16
7	84	16
8	84	16
9	84	16
10	83	17
11	83	17
12	83	17
13	83	17
14	83	17
15	83	17
16	83	17
17	82	18
18	82	18
19	82	18
20	82	18
21	82	18
22	82	18
23	82	18
24	82	18
25	82	18
26	82	18
27	82	18
28	82	18
29	82	18
30	82	18
31	82	18

Chance of precipitation in August

Any precipitation

San Juan gets around 10 mm of rain and snow over 2.3 wet days in August. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable precipitation averages around 8% and peaks near 9% on the wettest days, and about 0 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	31
Rain chance (%)	7	7	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	7	7	7	7	7	7	7	7	8	8	8	8	9	9

	Rain chance (%)
1	7
2	7
3	8
4	8
5	8
6	8
7	8
8	8
9	8
10	8
11	8
12	8
13	8
14	8
15	8
16	8
17	8
18	7
19	7
20	7
21	7
22	7
23	7
24	7
25	7
26	8
27	8
28	8
29	8
30	9
31	9

Humidity in August

DryComfortableHumidMuggyOppressiveMiserable

Most of August feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, August 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	31
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	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
31	100

Wind in August

Winds average 9 km/h in August.

Across August, daily wind ranges from about 9 km/h on the calmest days to 9 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	31
Wind speed (km/h)	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9
Feels	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm

	Wind speed (km/h)	Feels
1	9	calm
2	9	calm
3	9	calm
4	9	calm
5	9	calm
6	9	calm
7	9	calm
8	9	calm
9	9	calm
10	9	calm
11	9	calm
12	9	calm
13	9	calm
14	9	calm
15	9	calm
16	9	calm
17	9	calm
18	9	calm
19	9	calm
20	9	calm
21	9	calm
22	9	calm
23	9	calm
24	9	calm
25	9	calm
26	9	calm
27	9	calm
28	9	calm
29	9	calm
30	9	calm
31	9	calm

Sunrise & sunset in August

DaylightNight

Daylight runs from about 10 h 24 min at the start of August to 11 h 18 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 54 minutes over August. Sunrise moves from 8:27 AM to 7:55 AM, and sunset from 6:54 PM to 7:13 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	31
Daylight (h)	10.4	10.5	10.5	10.5	10.5	10.6	10.6	10.6	10.6	10.7	10.7	10.7	10.8	10.8	10.8	10.8	10.9	10.9	10.9	11.0	11.0	11.0	11.0	11.1	11.1	11.1	11.2	11.2	11.2	11.3	11.3
Sunrise (AM)	8:27	8:26	8:25	8:24	8:24	8:23	8:22	8:21	8:20	8:19	8:18	8:17	8:16	8:15	8:14	8:13	8:12	8:11	8:10	8:09	8:08	8:06	8:05	8:04	8:03	8:02	8:00	7:59	7:58	7:57	7:55
Sunset (PM)	6:54	6:54	6:55	6:55	6:56	6:57	6:57	6:58	6:59	6:59	7:00	7:01	7:01	7:02	7:03	7:03	7:04	7:05	7:05	7:06	7:07	7:07	7:08	7:09	7:09	7:10	7:10	7:11	7:12	7:12	7:13

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	10.4	8:27	6:54
2	10.5	8:26	6:54
3	10.5	8:25	6:55
4	10.5	8:24	6:55
5	10.5	8:24	6:56
6	10.6	8:23	6:57
7	10.6	8:22	6:57
8	10.6	8:21	6:58
9	10.6	8:20	6:59
10	10.7	8:19	6:59
11	10.7	8:18	7:00
12	10.7	8:17	7:01
13	10.8	8:16	7:01
14	10.8	8:15	7:02
15	10.8	8:14	7:03
16	10.8	8:13	7:03
17	10.9	8:12	7:04
18	10.9	8:11	7:05
19	10.9	8:10	7:05
20	11.0	8:09	7:06
21	11.0	8:08	7:07
22	11.0	8:06	7:07
23	11.0	8:05	7:08
24	11.1	8:04	7:09
25	11.1	8:03	7:09
26	11.1	8:02	7:10
27	11.2	8:00	7:10
28	11.2	7:59	7:11
29	11.2	7:58	7:12
30	11.3	7:57	7:12
31	11.3	7:55	7:13

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 4.56 kWh/m².

For context, solar energy here swings from a low near 3.26 kWh/m² to a high of 8.04 kWh/m² in December across the year — August's 4.56 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	31
Solar energy (kWh/m²)	4.0	4.0	4.1	4.1	4.2	4.2	4.2	4.3	4.3	4.3	4.4	4.4	4.4	4.5	4.5	4.5	4.6	4.6	4.7	4.7	4.8	4.8	4.8	4.9	4.9	4.9	5.0	5.0	5.0	5.1	5.1
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	Bright

	Solar energy (kWh/m²)	Level
1	4.0	Bright
2	4.0	Bright
3	4.1	Bright
4	4.1	Bright
5	4.2	Bright
6	4.2	Bright
7	4.2	Bright
8	4.3	Bright
9	4.3	Bright
10	4.3	Bright
11	4.4	Bright
12	4.4	Bright
13	4.4	Bright
14	4.5	Bright
15	4.5	Bright
16	4.5	Bright
17	4.6	Bright
18	4.6	Bright
19	4.7	Bright
20	4.7	Bright
21	4.8	Bright
22	4.8	Bright
23	4.8	Bright
24	4.9	Bright
25	4.9	Bright
26	4.9	Bright
27	5.0	Bright
28	5.0	Bright
29	5.0	Bright
30	5.1	Bright
31	5.1	Bright

Planning a trip in August

Is August a good time to visit San Juan?

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

8.1

Sightseeing

4th-best month of the year

4.1

Beach & pool

10th-best month of the year

August is one of the better times to visit San Juan for general sightseeing.

What to pack for San Juan in August

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

In August, San Juan sees daytime highs around 20°C and nights near 5°C. Worth packing: a warm layer and sun protection.

a warm layersun protection

UV index in San Juan in August

LowModerateHighVery highExtreme

Clear-sky midday UV in August 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 San Juan peaks around January 18 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 21 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	11	6	4	3	4	5	7	11	12	13
Level	Extreme	Extreme	Extreme	High	Moderate	Moderate	Moderate	Moderate	High	Extreme	Extreme	Extreme

	UV index (midday)	Level
Jan	14	Extreme
Feb	13	Extreme
Mar	11	Extreme
Apr	6	High
May	4	Moderate
Jun	3	Moderate
Jul	4	Moderate
Aug	5	Moderate
Sep	7	High
Oct	11	Extreme
Nov	12	Extreme
Dec	13	Extreme

Location & terrain

Where is San Juan?

San Juan sits at 31.5°S, 68.5°W, 646 m above sea level, in Argentina. The nearest listed city is Santa Lucía, 3.0 km away.

Topography around San Juan

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

Within 3 km, the terrain around San Juan has only modest variations in elevation — a maximum elevation change of 55 m around an average of 636 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 744 m; within 80 km, extreme variations in elevation — a maximum elevation change of 3,836 m.

The land around San Juan is covered by artificial surfaces (87%) within 3 km, bare terrain (26%) and shrubs (25%) within 16 km, and shrubs (39%), bare terrain (36%) and grassland (21%) within 80 km.

3 km

55 m

artificial surfaces 87%

16 km

744 m

bare terrain 26%

80 km

3,836 m

shrubs 39%

treesshrubsgrasslandcroplandartificial surfacesbare terrainwater

← July San Juan year-round climate September →Best places to visit in August

August weather nearby: Santa Lucía 3.0 km · Chimbas 5.0 km · Villa Paula de Sarmiento 5.0 km · Rawson 5.0 km · Villa General San Martín 11 km · Albardón 11 km · Pocito 17 km · Caucete 26 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 Juan (-31.5373°, -68.5257°, elevation 646 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	18	3
2	18	3
3	18	3
4	18	3
5	19	3
6	19	3
7	19	4
8	19	4
9	19	4
10	19	4
11	19	4
12	19	4
13	20	4
14	20	4
15	20	4
16	20	5
17	20	5
18	20	5
19	20	5
20	21	5
21	21	5
22	21	5
23	21	6
24	21	6
25	21	6
26	21	6
27	21	6
28	21	6
29	21	6
30	21	6
31	21	7

	Clearer (%)	Cloudier (%)
1	85	15
2	84	16
3	84	16
4	84	16
5	84	16
6	84	16
7	84	16
8	84	16
9	84	16
10	83	17
11	83	17
12	83	17
13	83	17
14	83	17
15	83	17
16	83	17
17	82	18
18	82	18
19	82	18
20	82	18
21	82	18
22	82	18
23	82	18
24	82	18
25	82	18
26	82	18
27	82	18
28	82	18
29	82	18
30	82	18
31	82	18

	Rain chance (%)
1	7
2	7
3	8
4	8
5	8
6	8
7	8
8	8
9	8
10	8
11	8
12	8
13	8
14	8
15	8
16	8
17	8
18	7
19	7
20	7
21	7
22	7
23	7
24	7
25	7
26	8
27	8
28	8
29	8
30	9
31	9

	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
31	100

	Avg high (°C)	Avg low (°C)
1	18	3
2	18	3
3	18	3
4	18	3
5	19	3
6	19	3
7	19	4
8	19	4
9	19	4
10	19	4
11	19	4
12	19	4
13	20	4
14	20	4
15	20	4
16	20	5
17	20	5
18	20	5
19	20	5
20	21	5
21	21	5
22	21	5
23	21	6
24	21	6
25	21	6
26	21	6
27	21	6
28	21	6
29	21	6
30	21	6
31	21	7

	Clearer (%)	Cloudier (%)
1	85	15
2	84	16
3	84	16
4	84	16
5	84	16
6	84	16
7	84	16
8	84	16
9	84	16
10	83	17
11	83	17
12	83	17
13	83	17
14	83	17
15	83	17
16	83	17
17	82	18
18	82	18
19	82	18
20	82	18
21	82	18
22	82	18
23	82	18
24	82	18
25	82	18
26	82	18
27	82	18
28	82	18
29	82	18
30	82	18
31	82	18

	Rain chance (%)
1	7
2	7
3	8
4	8
5	8
6	8
7	8
8	8
9	8
10	8
11	8
12	8
13	8
14	8
15	8
16	8
17	8
18	7
19	7
20	7
21	7
22	7
23	7
24	7
25	7
26	8
27	8
28	8
29	8
30	9
31	9

	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
31	100

	Avg high (°C)	Avg low (°C)
1	18	3
2	18	3
3	18	3
4	18	3
5	19	3
6	19	3
7	19	4
8	19	4
9	19	4
10	19	4
11	19	4
12	19	4
13	20	4
14	20	4
15	20	4
16	20	5
17	20	5
18	20	5
19	20	5
20	21	5
21	21	5
22	21	5
23	21	6
24	21	6
25	21	6
26	21	6
27	21	6
28	21	6
29	21	6
30	21	6
31	21	7

	Clearer (%)	Cloudier (%)
1	85	15
2	84	16
3	84	16
4	84	16
5	84	16
6	84	16
7	84	16
8	84	16
9	84	16
10	83	17
11	83	17
12	83	17
13	83	17
14	83	17
15	83	17
16	83	17
17	82	18
18	82	18
19	82	18
20	82	18
21	82	18
22	82	18
23	82	18
24	82	18
25	82	18
26	82	18
27	82	18
28	82	18
29	82	18
30	82	18
31	82	18

	Rain chance (%)
1	7
2	7
3	8
4	8
5	8
6	8
7	8
8	8
9	8
10	8
11	8
12	8
13	8
14	8
15	8
16	8
17	8
18	7
19	7
20	7
21	7
22	7
23	7
24	7
25	7
26	8
27	8
28	8
29	8
30	9
31	9

	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
31	100