Castro weather in May

In May, Castro sees average daytime highs of 12°C and overnight lows near 6°C, with 172 mm of rain across 17.3 wet days and about 9.6 hours of daylight. It is the 8th-warmest and 4th-wettest month of the year here.

Highs ease over the month, from about 14°C in the first days to 11°C by the end. The sky is clear or mostly clear about 13% of the time in May, and the air most often feels dry.

Daylight stretches from about 10 h 12 min at the start of May to 9 h 12 min by month's end. Set against the rest of the year, May is Castro's 11th-clearest and 8th-windiest month. For the whole year in context, see Castro's year-round climate.

Daytime high
12°
8th warmest
Overnight low
5th coldest
Rainfall
172 mm
17.3 wet days
Daylight
9 h 36 min
9:04 AM – 6:39 PM
Cloud cover
74%
11th clearest
Wind
10 km/h
8th windiest
Solar energy
1.54 kWh/m²
Travel score
2.7
out of 10

Castro is Chilean city.

Density
2,926/km²
people per km²
Founded
1567

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

Temperature in May

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 14°C in the first days to 11°C by the end.

A typical May day in Castro reaches about 12°C in the afternoon and slips back to 6°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 10°C and 15°C. Set against its neighbours, May runs about 3°C cooler than April and about 2°C warmer than June.

-5°10°15°20°151015202531
Avg high (°C)Avg low (°C)
1147
2147
3147
4147
5137
6137
7136
8136
9136
10136
11136
12136
13136
14136
15136
16126
17126
18126
19126
20126
21126
22125
23125
24125
25125
26115
27115
28115
29115
30115
31115

Castro weather by month

How May compares with the rest of the year at a glance. May is the 8th-warmest and 4th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan20° / 10°639.814.86.2
Feb20° / 10°568.313.76.4
Mar18° / 8611.512.45.6
Apr15° / 11213.610.94.0
May12° / 17217.39.62.7
Jun10° / 19219.38.91.8
Jul10° / 17417.99.21.8
Aug11° / 19619.910.32.0
Sep12° / 13016.211.72.8
Oct14° / 12416.313.23.5
Nov16° / 9813.414.44.4
Dec18° / 8212.615.15.4

Cloud cover in May

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 13% of the time in May.

Beyond those clear spells, partly cloudy skies cover about 14% of May, with mostly cloudy or overcast conditions the remaining 73%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
13070
23070
32971
42872
52872
62872
72872
82674
92674
102674
112674
122674
132674
142674
152674
162674
172674
182674
192674
202674
212674
222674
232773
242773
252773
262773
272674
282773
292773
302773
312773

Chance of precipitation in May

Any precipitation

Castro gets around 172 mm of rain over 17.3 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 56% and peaks near 61% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%151015202531
Rain chance (%)
150
250
350
451
551
652
752
852
953
1053
1154
1254
1355
1455
1556
1656
1757
1857
1958
2058
2158
2258
2359
2459
2559
2659
2759
2860
2960
3061
3161

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 99% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)
1973
2982
3982
4982
5982
6982
7982
8982
9982
10982
11982
12982
13982
14982
15982
16982
17991
18991
19991
20991
21991
22991
23991
24991
25991
261000
271000
281000
291000
301000
311000

Wind in May

Winds average 10 km/h in May.

Across May, daily wind ranges from about 10 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
110calm
210calm
310calm
410calm
510calm
610calm
710calm
810calm
910calm
1010calm
1110calm
1210calm
1310calm
1410calm
1510calm
1610calm
1710calm
1810calm
1910calm
2010calm
2110calm
2210calm
2310calm
2411calm
2511calm
2611calm
2711calm
2811calm
2911calm
3011calm
3111calm

Sunrise & sunset in May

DaylightNight

Daylight runs from about 10 h 12 min at the start of May to 9 h 12 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 60 minutes over May. Sunrise moves from 8:47 AM to 9:18 AM, and sunset from 6:58 PM to 6:27 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
110.28:476:58
210.18:486:56
310.18:496:55
410.08:506:53
510.08:526:52
610.08:536:51
79.98:546:49
89.98:556:48
99.88:566:47
109.88:576:46
119.88:586:45
129.78:596:43
139.79:006:42
149.79:026:41
159.69:036:40
169.69:046:39
179.69:056:38
189.59:066:37
199.59:076:36
209.59:086:35
219.49:096:34
229.49:106:33
239.49:116:33
249.39:126:32
259.39:136:31
269.39:146:30
279.39:146:30
289.29:156:29
299.29:166:28
309.29:176:28
319.29:186:27

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 1.54 kWh/m².

For context, solar energy here swings from a low near 1.16 kWh/m² to a high of 6.04 kWh/m² in January across the year — May's 1.54 kWh/m² sits near the bottom.

00.511.522.5151015202531
Solar energy (kWh/m²)Level
11.9Dim
21.9Dim
31.9Dim
41.8Dim
51.8Dim
61.8Dim
71.7Dim
81.7Dim
91.7Dim
101.7Dim
111.6Dim
121.6Dim
131.6Dim
141.6Dim
151.5Dim
161.5Dim
171.5Dim
181.5Dim
191.5Dim
201.4Dim
211.4Dim
221.4Dim
231.4Dim
241.4Dim
251.4Dim
261.4Dim
271.3Dim
281.3Dim
291.3Dim
301.3Dim
311.3Dim
Planning a trip in May

Is May a good time to visit Castro?

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

2.7
Sightseeing
9th-best month of the year
0.0
Beach & pool
8th-best month of the year

May is a weaker month for outdoor sightseeing in Castro.

What to pack for Castro in May

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

In May, Castro sees daytime highs around 12°C and nights near 6°C. Pack rain gear. Worth having: a warm layer. About 17 days see rain.

rain geara warm layer

Sea temperature near Castro in May

The nearest coast averages about 12°C in May — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 31 km away) is warmest in January at about 14°C and coldest in August near 11°C.

The water stays below 20°C all year — cool enough that most swimmers want a wetsuit.

10°12°14°16°JanFebMarAprMayJunJulAugSepOctNovDecbracingcool
Sea temperature (°C)Comfort
Jan14Bracing
Feb14Bracing
Mar14Bracing
Apr13Bracing
May12Bracing
Jun12Bracing
Jul11Bracing
Aug11Bracing
Sep11Bracing
Oct11Bracing
Nov12Bracing
Dec13Bracing

UV index in Castro in May

LowModerateHighVery highExtreme

Clear-sky midday UV in May peaks around 2. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Castro peaks around December 23 at about 12 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 20 at about 1 (low).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeModerateLowModerateHighVery highExtremeDec 23UV 12Jun 20UV 1
UV index (midday)Level
Jan11Extreme
Feb11Extreme
Mar7High
Apr4Moderate
May2Moderate
Jun1Low
Jul2Low
Aug2Moderate
Sep4Moderate
Oct7High
Nov8Very high
Dec12Extreme
Location & terrain

Where is Castro?

Castro sits at 42.5°S, 73.8°W, 81 m above sea level, in Chile. The nearest listed city is Ancud, 67 km away.

Topography around Castro

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

Within 3 km, the terrain around Castro has significant variations in elevation — a maximum elevation change of 306 m around an average of 69 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 835 m; within 80 km, large variations in elevation — a maximum elevation change of 847 m.

The land around Castro is covered by trees (39%), water (27%) and grassland (20%) within 3 km, trees (54%) and grassland (25%) within 16 km, and water (58%) and trees (34%) within 80 km.

3 km
306 m
16 km
835 m
80 km
847 m
treesgrasslandartificial surfaceswater
May weather nearby: Ancud 67 km · Quellón 73 km · Calbuco 94 km · Maullín 96 km · Puerto Montt 131 km · Puerto Varas 144 km · Llanquihue 149 km · Frutillar 161 km

Chile travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type C / F / L
220 V · 50 Hz
Prices
≈ 48% of US
price level, 2025
GDP per capita
$17,995
2025
Happiness
6.3 / 10
World Happiness, 2025
Safe drinking water
98%
of population, 2024
Homicide rate
6.3
per 100k, 2023
Road deaths
14.9
per 100k/yr, 2019
Income group
High
World Bank
English
Moderate
EF EPI 517
Religion
Catholic 57%none 26%Evangelical or Protestant 16%other Christians and traditions related to 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 Castro (-42.4721°, -73.7732°, elevation 81 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).