Valparaiso weather in September

In September, Valparaiso sees average daytime highs of 13°C and overnight lows near 12°C, with 27 mm of rain across 3 wet days and about 11.8 hours of daylight. It is the 10th-warmest and 5th-wettest month of the year here.

Day-to-day highs hold fairly steady near 13°C through the month. The sky is clear or mostly clear about 48% 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 Valparaiso's 8th-clearest and 3rd-windiest month. For the whole year in context, see Valparaiso's year-round climate.

Daytime high
13°
10th warmest
Overnight low
12°
3rd coldest
Rainfall
27 mm
3 wet days
Daylight
11 h 48 min
7:47 AM – 7:35 PM
Cloud cover
44%
8th clearest
Wind
22 km/h
3rd windiest
Solar energy
5.34 kWh/m²
Travel score
4.4
out of 10

Valparaiso is city in Chile.

Air quality
Moderate
PM2.5 13.7 µg/m³ · 2019
Density
5,887/km²
people per km²
Founded
1536

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

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 13°C through the month.

A typical September day in Valparaiso reaches about 13°C in the afternoon and slips back to 12°C overnight — a 1°C spread between the day's warmth and the night's chill. On most days the high lands between 12°C and 14°C. Set against its neighbours, September runs on par with August and on par with October.

10°12°14°16°151015202530
Avg high (°C)Avg low (°C)
11311
21312
31312
41312
51312
61312
71312
81312
91312
101312
111312
121312
131312
141312
151312
161312
171312
181312
191312
201312
211312
221312
231312
241312
251312
261312
271312
281312
291312
301312

Valparaiso weather by month

How September compares with the rest of the year at a glance. September is the 10th-warmest and 5th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan17° / 16°00.113.97.2
Feb17° / 16°10.213.27.3
Mar17° / 15°20.612.36.9
Apr15° / 14°161.811.25.9
May14° / 13°614.410.34.9
Jun14° / 12°1216.89.94.2
Jul13° / 11°675.5104.1
Aug13° / 11°574.610.84.1
Sep13° / 12°27311.84.4
Oct13° / 12°131.712.84.8
Nov14° / 13°30.413.75.6
Dec16° / 15°30.314.16.4

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 48% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 14% of September, with mostly cloudy or overcast conditions the remaining 37%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15941
25941
35941
46040
56040
66139
76238
86238
96337
106337
116337
126436
136436
146436
156535
166535
176535
186535
196436
206436
216436
226436
236436
246436
256337
266337
276337
286337
296337
306337

Chance of precipitation in September

Any precipitation

Valparaiso gets around 27 mm of rain over 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 10% and peaks near 14% on the wettest days.

0%10%20%30%151015202530
Rain chance (%)
114
214
314
413
513
612
712
812
912
1011
1111
1211
1311
1410
1510
1610
179
189
199
209
218
228
238
248
258
268
278
288
298
308

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

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)
1982
2982
3982
4982
5991
6991
7991
8991
9991
10991
11991
12991
13991
14991
15991
16991
17991
18991
19991
20991
21991
22991
23991
24991
25991
26991
271000
281000
291000
301000

Wind in September

Winds average 22 km/h in September.

Across September, daily wind ranges from about 21 km/h on the calmest days to 22 km/h at its breeziest. It stays fairly steady from day to day.

0510152025151015202530
Wind speed (km/h)Feels
121breezy
221breezy
321breezy
421breezy
522breezy
622breezy
722breezy
822breezy
922breezy
1022breezy
1122breezy
1222breezy
1322breezy
1422breezy
1522breezy
1622breezy
1722breezy
1822breezy
1922breezy
2022breezy
2122breezy
2222breezy
2322breezy
2422breezy
2522breezy
2622breezy
2722breezy
2822breezy
2922breezy
3022breezy

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 8:08 AM to 7:27 AM, and sunset from 7:25 PM to 7:44 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
111.38:087:25
211.38:067:25
311.48:057:26
411.48:047:27
511.48:027:27
611.58:017:28
711.58:007:29
811.57:587:29
911.67:577:30
1011.67:557:31
1111.67:547:31
1211.77:537:32
1311.77:517:33
1411.77:507:33
1511.87:487:34
1611.87:477:35
1711.87:457:35
1811.97:447:36
1911.97:437:37
2011.97:417:38
2112.07:407:38
2212.07:387:39
2312.07:377:40
2412.17:367:40
2512.17:347:41
2612.17:337:42
2712.27:317:42
2812.27:307:43
2912.37:297:44
3012.37:277:44

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.34 kWh/m².

For context, solar energy here swings from a low near 2.61 kWh/m² to a high of 8.82 kWh/m² in December across the year — September's 5.34 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
14.5Bright
24.6Bright
34.7Bright
44.7Bright
54.8Bright
64.8Bright
74.9Bright
84.9Bright
95.0Bright
105.0Bright
115.1Bright
125.2Bright
135.2Bright
145.3Bright
155.3Bright
165.4Bright
175.5Bright
185.5Bright
195.6Bright
205.6Bright
215.7Bright
225.7Bright
235.8Bright
245.8Bright
255.8Bright
265.9Bright
275.9Bright
286.0Bright
296.0Intense
306.1Intense
Planning a trip in September

Is September a good time to visit Valparaiso?

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

4.4
Sightseeing
9th-best month of the year
0.0
Beach & pool
8th-best month of the year

September is a reasonable time to visit Valparaiso for sightseeing.

What to pack for Valparaiso in September

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

In September, Valparaiso sees daytime highs around 13°C and nights near 12°C. Worth packing: a warm layer, sun protection and a windbreaker. About 3 days see rain.

a warm layersun protectiona windbreaker

Sea temperature near Valparaiso in September

The nearest coast averages about 13°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 18 km away) is warmest in February at about 17°C and coldest in August near 13°C.

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

12°14°16°18°JanFebMarAprMayJunJulAugSepOctNovDecbracingcool
Sea temperature (°C)Comfort
Jan17Cool
Feb17Cool
Mar17Cool
Apr15Cool
May14Bracing
Jun14Bracing
Jul13Bracing
Aug13Bracing
Sep13Bracing
Oct13Bracing
Nov14Bracing
Dec16Cool

UV index in Valparaiso in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 6 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Valparaiso peaks around January 17 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 18 at about 3 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 11 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeModerateHighVery highExtremeJan 17UV 13Jun 18UV 3
UV index (midday)Level
Jan14Extreme
Feb12Extreme
Mar10Extreme
Apr5High
May3Moderate
Jun3Moderate
Jul3Moderate
Aug4Moderate
Sep6High
Oct9Very high
Nov11Extreme
Dec12Extreme

Air quality in Valparaiso in September

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where September falls, not just the annual average.

Air quality in Valparaiso is worst in January — around 22 µg/m³ PM2.5 (moderate), about 2.1× the cleanest month (March, 10 µg/m³).

Seasonal pattern from CAMS reanalysis, scaled to Valparaiso's WHO annual average of 13.7 µg/m³.

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodModerateJan 1821 µg/m³Mar 2210 µg/m³
PM2.5 (µg/m³)Level
Jan22Moderate
Feb16Moderate
Mar10Good
Apr11Good
May12Moderate
Jun13Moderate
Jul12Moderate
Aug14Moderate
Sep14Moderate
Oct13Moderate
Nov14Moderate
Dec14Moderate
Location & terrain

Where is Valparaiso?

Valparaiso sits at 33.0°S, 71.6°W, 15 m above sea level, in Chile. The nearest listed city is Vina del Mar, 7.0 km away.

Topography around Valparaiso

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

Within 3 km, the terrain around Valparaiso has significant variations in elevation — a maximum elevation change of 429 m around an average of 84 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 585 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,320 m.

The land around Valparaiso is covered by water (44%) and artificial surfaces (43%) within 3 km, water (53%) and trees (23%) within 16 km, and water (37%) and shrubs (24%) within 80 km.

3 km
429 m
16 km
585 m
80 km
2,320 m
treesshrubsgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Vina del Mar 7.0 km · Placilla 10 km · Concón 17 km · Quilpué 17 km · Villa Alemana 24 km · Quintero 29 km · Limache 34 km · Casablanca 38 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 Valparaiso (-33.036°, -71.6296°, elevation 15 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. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).