San Justo weather in May

In May, San Justo sees average daytime highs of 21°C and overnight lows near 12°C, with 78 mm of rain across 6.2 wet days and about 10.5 hours of daylight. It is the 9th-warmest and 8th-wettest month of the year here.

Highs ease over the month, from about 23°C in the first days to 19°C by the end. The sky is clear or mostly clear about 37% of the time in May, and the air most often feels dry.

Daylight stretches from about 10 h 48 min at the start of May to 10 h 12 min by month's end. Set against the rest of the year, May is San Justo's 12th-clearest and 8th-windiest month. For the whole year in context, see San Justo's year-round climate.

Daytime high
21°
9th warmest
Overnight low
12°
5th coldest
Rainfall
78 mm
6.2 wet days
Daylight
10 h 24 min
7:45 AM – 6:12 PM
Cloud cover
55%
12th clearest
Wind
11 km/h
8th windiest
Solar energy
2.9 kWh/m²
Travel score
7.1
out of 10

Temperature in May

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 23°C in the first days to 19°C by the end.

A typical May day in San Justo reaches about 21°C in the afternoon and slips back to 12°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 16°C and 26°C. Set against its neighbours, May runs about 4°C cooler than April and about 3°C warmer than June.

10°20°30°151015202531
Avg high (°C)Avg low (°C)
12313
22313
32313
42213
52213
62213
72213
82212
92212
102212
112212
122212
132112
142112
152112
162112
172112
182111
192111
202011
212011
222011
232011
242011
252011
262010
272010
281910
291910
301910
311910

How May really feels in San Justo

Once humidity and wind are folded in, May 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
0
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

May 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 May compares with the rest of the year at a glance. May is the 9th-warmest and 8th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan31° / 20°1259.613.84.6
Feb30° / 20°1248.713.15.2
Mar28° / 18°1268.912.26.3
Apr25° / 15°1328.911.37.2
May21° / 12°786.210.57.1
Jun18° / 495.2106.7
Jul18° / 374.310.26.9
Aug21° / 564.710.97.5
Sep23° / 11°706.311.87.6
Oct25° / 14°1379.212.87.1
Nov28° / 16°1258.113.66.6
Dec30° / 19°1348.9145.3

Cloud cover in May

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 37% of the time in May, the cloudiest month of the year.

Beyond those clear spells, partly cloudy skies cover about 12% of May, with mostly cloudy or overcast conditions the remaining 51%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15644
25545
35545
45446
55347
65347
75248
85149
95050
104951
114951
124951
134852
144852
154753
164753
174654
184555
194555
204753
214753
224753
234753
244852
254852
264852
274852
284951
294951
304951
315050

Chance of precipitation in May

Any precipitation

San Justo gets around 78 mm of rain over 6.2 wet days in May. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 20% and peaks near 26% on the wettest days. The odds ease toward the end of the month.

0%10%20%30%40%151015202531
Rain chance (%)
126
225
325
424
524
623
723
822
922
1022
1122
1222
1321
1421
1521
1621
1721
1820
1920
2019
2119
2218
2318
2418
2517
2617
2717
2817
2916
3016
3116

Humidity in May

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, May lands in the dry band about 58% of days. Sticky, muggy-or-worse air turns up on roughly 9% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1472017132
2481917132
3491917132
4501917122
5501917122
6511917112
7512017112
8522016102
954201691
1054211681
1154211681
1254211771
1354211771
1454211771
1555211761
1657211660
1757211660
1858201660
1959191660
2061191550
2162181550
2262171551
2364161451
2465151451
2566151351
2667141351
2769131251
2869131251
2970131151
3071121151
3172121051

Wind in May

Winds average 11 km/h in May.

Across May, daily wind ranges from about 11 km/h on the calmest days to 11 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (km/h)Feels
111calm
211calm
311calm
411calm
511calm
611calm
711calm
811calm
911calm
1011calm
1111calm
1211calm
1311calm
1411calm
1511calm
1611calm
1711calm
1811calm
1911calm
2011calm
2111calm
2211calm
2311calm
2411calm
2511calm
2611calm
2711calm
2811calm
2911calm
3011calm
3111calm

Sunrise & sunset in May

DaylightNight

Daylight runs from about 10 h 48 min at the start of May to 10 h 12 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 36 minutes over May. Sunrise moves from 7:35 AM to 7:55 AM, and sunset from 6:24 PM to 6:05 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
110.87:356:24
210.87:366:23
310.87:366:22
410.77:376:21
510.77:386:20
610.77:386:20
710.77:396:19
810.67:406:18
910.67:406:17
1010.67:416:16
1110.67:426:16
1210.57:436:15
1310.57:436:14
1410.57:446:13
1510.57:456:13
1610.47:456:12
1710.47:466:11
1810.47:476:11
1910.47:476:10
2010.47:486:10
2110.37:496:09
2210.37:496:09
2310.37:506:08
2410.37:506:08
2510.37:516:07
2610.27:526:07
2710.27:526:06
2810.27:536:06
2910.27:536:06
3010.27:546:05
3110.27:556:05

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 2.9 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 — May's 2.9 kWh/m² sits near the bottom.

01234151015202531
Solar energy (kWh/m²)Level
13.3Moderate
23.3Moderate
33.3Moderate
43.2Moderate
53.2Moderate
63.2Moderate
73.1Moderate
83.1Moderate
93.1Moderate
103.0Moderate
113.0Moderate
123.0Moderate
133.0Moderate
142.9Moderate
152.9Moderate
162.9Moderate
172.8Moderate
182.8Moderate
192.8Moderate
202.8Moderate
212.8Moderate
222.7Moderate
232.7Moderate
242.7Moderate
252.7Moderate
262.7Moderate
272.7Moderate
282.7Moderate
292.6Moderate
302.6Moderate
312.6Moderate
Planning a trip in May

Is May a good time to visit San Justo?

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

7.1
Sightseeing
4th-best month of the year
4.3
Beach & pool
9th-best month of the year

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

What to pack for San Justo in May

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

In May, San Justo sees daytime highs around 21°C and nights near 12°C. Little to plan around — just the basics. About 6 days see rain.

UV index in San Justo in May

LowModerateHighVery highExtreme

Clear-sky midday UV in May 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 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.

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highModerateHighVery highExtremeJan 18UV 14Jun 20UV 3
UV index (midday)Level
Jan14Extreme
Feb13Extreme
Mar10Extreme
Apr7High
May4Moderate
Jun3Moderate
Jul4Moderate
Aug5Moderate
Sep7High
Oct9Very high
Nov11Extreme
Dec13Extreme
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
16 km
49 m
80 km
79 m
treesshrubsgrasslandcroplandartificial surfaceswaterwetland
May 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
Roman Catholic 63%none 19%Evangelical 15%Jehovah's Witness and Church of Jesus Christ 1%

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).