Castro weather in September

In September, Castro sees average daytime highs of 12°C and overnight lows near 5°C, with 130 mm of precipitation across 16.2 wet days and about 11.7 hours of daylight. It is the 8th-warmest and 5th-wettest month of the year here.

Highs climb over the month, from about 12°C in the first days to 13°C by the end. The sky is clear or mostly clear about 12% of the time in September, and the air most often feels dry.

Daylight stretches from about 11 hours at the start of September to 12 h 24 min by month's end. Set against the rest of the year, September is Castro's 7th-clearest and 6th-windiest month. For the whole year in context, see Castro's year-round climate.

Daytime high: 12°; 8th warmest
Overnight low: 5°; 4th coldest
Precipitation: 130 mm; 16.2 wet days
Daylight: 11 h 42 min; 7:58 AM – 7:41 PM
Cloud cover: 73%; 7th clearest
Wind: 10 km/h; 6th windiest
Solar energy: 3.14 kWh/m²
Travel score: 2.8; 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.

← August Castro 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 12°C in the first days to 13°C by the end.

A typical September day in Castro reaches about 12°C in the afternoon and slips back to 5°C overnight — a 8°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, September runs about 2°C warmer than August and about 2°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)	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	13	13	13	13	13	13	13	13	13	13	13	13	13	13	13
Avg low (°C)	4	4	4	4	4	4	4	4	4	4	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5

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

Castro weather by month

How September compares with the rest of the year at a glance. September is the 8th-warmest and 5th-wettest month here — the current month is highlighted below.

Month	High / Low (°C)	Rainfall (mm)	Wet days	Daylight (hours)	Travel score
Jan	20° / 10°	63	9.8	14.8	6.2
Feb	20° / 10°	56	8.3	13.7	6.4
Mar	18° / 9°	86	11.5	12.4	5.6
Apr	15° / 7°	112	13.6	10.9	4.0
May	12° / 6°	172	17.3	9.6	2.7
Jun	10° / 5°	192	19.3	8.9	1.8
Jul	10° / 4°	174	17.9	9.2	1.8
Aug	11° / 4°	196	19.9	10.3	2.0
Sep	12° / 5°	130	16.2	11.7	2.8
Oct	14° / 6°	124	16.3	13.2	3.5
Nov	16° / 7°	98	13.4	14.4	4.4
Dec	18° / 9°	82	12.6	15.1	5.4

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 12% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 13% of September, with mostly cloudy or overcast conditions the remaining 75%.

	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 (%)	26	26	26	26	26	27	26	26	26	25	25	24	24	23	23	24	24	23	23	23	24	25	25	25	25	25	26	26	26	26
Cloudier (%)	74	74	74	74	74	73	74	74	74	75	75	76	76	77	77	76	76	77	77	77	76	75	75	75	75	75	74	74	74	74

	Clearer (%)	Cloudier (%)
1	26	74
2	26	74
3	26	74
4	26	74
5	26	74
6	27	73
7	26	74
8	26	74
9	26	74
10	25	75
11	25	75
12	24	76
13	24	76
14	23	77
15	23	77
16	24	76
17	24	76
18	23	77
19	23	77
20	23	77
21	24	76
22	25	75
23	25	75
24	25	75
25	25	75
26	25	75
27	26	74
28	26	74
29	26	74
30	26	74

Chance of precipitation in September

Any precipitation

Castro gets around 130 mm of rain and snow over 16.2 wet days in September. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable precipitation averages around 55% and peaks near 63% on the wettest days, and about 0 day brings snow. The odds ease 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 (%)	63	62	62	61	60	59	58	57	57	56	56	56	55	55	54	53	53	52	52	52	52	52	52	52	52	52	53	53	53	53

	Rain chance (%)
1	63
2	62
3	62
4	61
5	60
6	59
7	58
8	57
9	57
10	56
11	56
12	56
13	55
14	55
15	54
16	53
17	53
18	52
19	52
20	52
21	52
22	52
23	52
24	52
25	52
26	52
27	53
28	53
29	53
30	53

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 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
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

	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

Wind in September

Winds average 10 km/h in September.

Across September, 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.

	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)	11	11	11	11	11	10	10	10	10	10	10	10	10	10	10	10	10	10	10	10	10	10	10	10	10	10	10	10	10	10
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

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

Sunrise & sunset in September

DaylightNight

Daylight runs from about 11 hours 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 84 minutes over September. Sunrise moves from 8:25 AM to 7:32 AM, and sunset from 7:24 PM to 7:57 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)	11.0	11.0	11.1	11.1	11.2	11.2	11.3	11.3	11.4	11.4	11.5	11.5	11.6	11.6	11.7	11.7	11.8	11.8	11.9	11.9	12.0	12.0	12.1	12.1	12.2	12.2	12.3	12.3	12.4	12.4
Sunrise (AM)	8:25	8:23	8:22	8:20	8:18	8:16	8:14	8:13	8:11	8:09	8:07	8:05	8:03	8:02	8:00	7:58	7:56	7:54	7:52	7:51	7:49	7:47	7:45	7:43	7:41	7:39	7:38	7:36	7:34	7:32
Sunset (PM)	7:24	7:26	7:27	7:28	7:29	7:30	7:31	7:32	7:33	7:34	7:35	7:37	7:38	7:39	7:40	7:41	7:42	7:43	7:44	7:45	7:46	7:48	7:49	7:50	7:51	7:52	7:53	7:54	7:55	7:57

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	11.0	8:25	7:24
2	11.0	8:23	7:26
3	11.1	8:22	7:27
4	11.1	8:20	7:28
5	11.2	8:18	7:29
6	11.2	8:16	7:30
7	11.3	8:14	7:31
8	11.3	8:13	7:32
9	11.4	8:11	7:33
10	11.4	8:09	7:34
11	11.5	8:07	7:35
12	11.5	8:05	7:37
13	11.6	8:03	7:38
14	11.6	8:02	7:39
15	11.7	8:00	7:40
16	11.7	7:58	7:41
17	11.8	7:56	7:42
18	11.8	7:54	7:43
19	11.9	7:52	7:44
20	11.9	7:51	7:45
21	12.0	7:49	7:46
22	12.0	7:47	7:48
23	12.1	7:45	7:49
24	12.1	7:43	7:50
25	12.2	7:41	7:51
26	12.2	7:39	7:52
27	12.3	7:38	7:53
28	12.3	7:36	7:54
29	12.4	7:34	7:55
30	12.4	7:32	7:57

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 3.14 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 — September's 3.14 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)	2.6	2.6	2.6	2.7	2.7	2.8	2.8	2.8	2.9	2.9	3.0	3.0	3.0	3.1	3.1	3.1	3.2	3.2	3.3	3.3	3.4	3.4	3.4	3.5	3.5	3.6	3.6	3.6	3.7	3.7
Level	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate

	Solar energy (kWh/m²)	Level
1	2.6	Moderate
2	2.6	Moderate
3	2.6	Moderate
4	2.7	Moderate
5	2.7	Moderate
6	2.8	Moderate
7	2.8	Moderate
8	2.8	Moderate
9	2.9	Moderate
10	2.9	Moderate
11	3.0	Moderate
12	3.0	Moderate
13	3.0	Moderate
14	3.1	Moderate
15	3.1	Moderate
16	3.1	Moderate
17	3.2	Moderate
18	3.2	Moderate
19	3.3	Moderate
20	3.3	Moderate
21	3.4	Moderate
22	3.4	Moderate
23	3.4	Moderate
24	3.5	Moderate
25	3.5	Moderate
26	3.6	Moderate
27	3.6	Moderate
28	3.6	Moderate
29	3.7	Moderate
30	3.7	Moderate

Planning a trip in September

Is September a good time to visit Castro?

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

2.8

Sightseeing

8th-best month of the year

0.0

Beach & pool

8th-best month of the year

September is a weaker month for outdoor sightseeing in Castro.

What to pack for Castro in September

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

In September, Castro sees daytime highs around 12°C and nights near 5°C. Pack rain gear. Worth having: a warm layer. About 16 days see rain.

rain geara warm layer

Sea temperature near Castro 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 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.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Sea temperature (°C)	14	14	14	13	12	12	11	11	11	11	12	13
Comfort	Bracing	Bracing	Bracing	Bracing	Bracing	Bracing	Bracing	Bracing	Bracing	Bracing	Bracing	Bracing

	Sea temperature (°C)	Comfort
Jan	14	Bracing
Feb	14	Bracing
Mar	14	Bracing
Apr	13	Bracing
May	12	Bracing
Jun	12	Bracing
Jul	11	Bracing
Aug	11	Bracing
Sep	11	Bracing
Oct	11	Bracing
Nov	12	Bracing
Dec	13	Bracing

UV index in Castro in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September 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 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.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
UV index (midday)	11	11	7	4	2	1	2	2	4	7	8	12
Level	Extreme	Extreme	High	Moderate	Moderate	Low	Low	Moderate	Moderate	High	Very high	Extreme

	UV index (midday)	Level
Jan	11	Extreme
Feb	11	Extreme
Mar	7	High
Apr	4	Moderate
May	2	Moderate
Jun	1	Low
Jul	2	Low
Aug	2	Moderate
Sep	4	Moderate
Oct	7	High
Nov	8	Very high
Dec	12	Extreme

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

trees 39%

16 km

835 m

trees 54%

80 km

847 m

water 58%

treesgrasslandartificial surfaceswater

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

September 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

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).

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

	Clearer (%)	Cloudier (%)
1	26	74
2	26	74
3	26	74
4	26	74
5	26	74
6	27	73
7	26	74
8	26	74
9	26	74
10	25	75
11	25	75
12	24	76
13	24	76
14	23	77
15	23	77
16	24	76
17	24	76
18	23	77
19	23	77
20	23	77
21	24	76
22	25	75
23	25	75
24	25	75
25	25	75
26	25	75
27	26	74
28	26	74
29	26	74
30	26	74

	Rain chance (%)
1	63
2	62
3	62
4	61
5	60
6	59
7	58
8	57
9	57
10	56
11	56
12	56
13	55
14	55
15	54
16	53
17	53
18	52
19	52
20	52
21	52
22	52
23	52
24	52
25	52
26	52
27	53
28	53
29	53
30	53

	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

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

	Clearer (%)	Cloudier (%)
1	26	74
2	26	74
3	26	74
4	26	74
5	26	74
6	27	73
7	26	74
8	26	74
9	26	74
10	25	75
11	25	75
12	24	76
13	24	76
14	23	77
15	23	77
16	24	76
17	24	76
18	23	77
19	23	77
20	23	77
21	24	76
22	25	75
23	25	75
24	25	75
25	25	75
26	25	75
27	26	74
28	26	74
29	26	74
30	26	74

	Rain chance (%)
1	63
2	62
3	62
4	61
5	60
6	59
7	58
8	57
9	57
10	56
11	56
12	56
13	55
14	55
15	54
16	53
17	53
18	52
19	52
20	52
21	52
22	52
23	52
24	52
25	52
26	52
27	53
28	53
29	53
30	53

	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

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

	Clearer (%)	Cloudier (%)
1	26	74
2	26	74
3	26	74
4	26	74
5	26	74
6	27	73
7	26	74
8	26	74
9	26	74
10	25	75
11	25	75
12	24	76
13	24	76
14	23	77
15	23	77
16	24	76
17	24	76
18	23	77
19	23	77
20	23	77
21	24	76
22	25	75
23	25	75
24	25	75
25	25	75
26	25	75
27	26	74
28	26	74
29	26	74
30	26	74

	Rain chance (%)
1	63
2	62
3	62
4	61
5	60
6	59
7	58
8	57
9	57
10	56
11	56
12	56
13	55
14	55
15	54
16	53
17	53
18	52
19	52
20	52
21	52
22	52
23	52
24	52
25	52
26	52
27	53
28	53
29	53
30	53

	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