San Isidro weather in October

In October, San Isidro sees average daytime highs of 20°C and overnight lows near 16°C, with 3 mm of rain across 0.6 wet days and about 12.3 hours of daylight. It is the 8th-warmest and 6th-wettest month of the year here.

Day-to-day highs hold fairly steady near 20°C through the month. The sky is clear or mostly clear about 22% of the time in October, and the air most often feels comfortable.

Daylight stretches from about 12 h 06 min at the start of October to 12 h 24 min by month's end. Set against the rest of the year, October is San Isidro's 6th-clearest and 2nd-windiest month. For the whole year in context, see San Isidro's year-round climate.

Daytime high
20°
8th warmest
Overnight low
16°
4th coldest
Rainfall
3 mm
0.6 wet days
Daylight
12 h 18 min
5:45 AM – 6:01 PM
Cloud cover
62%
6th clearest
Wind
10 km/h
2nd windiest
Solar energy
6.67 kWh/m²
Travel score
7.6
out of 10

San Isidro is human settlement in Peru.

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

Temperature in October

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 20°C through the month.

A typical October day in San Isidro reaches about 20°C in the afternoon and slips back to 16°C overnight — a 4°C spread between the day's warmth and the night's chill. On most days the high lands between 19°C and 22°C. Set against its neighbours, October runs on par with September and about 1°C cooler than November.

10°15°20°25°151015202531
Avg high (°C)Avg low (°C)
12016
22016
32016
42016
52016
62016
72016
82016
92016
102016
112016
122016
132016
142016
152016
162016
172016
182016
192016
202016
212016
222116
232116
242116
252116
262116
272116
282116
292116
302116
312116

San Isidro weather by month

How October compares with the rest of the year at a glance. October is the 8th-warmest and 6th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan24° / 20°195.712.67.0
Feb25° / 20°318.912.46.3
Mar25° / 20°247.612.16.7
Apr23° / 19°72.611.77.8
May22° / 17°20.411.58.1
Jun20° / 17°1011.37.9
Jul20° / 16°10.111.47.8
Aug19° / 16°1011.67.9
Sep20° / 16°20.311.97.7
Oct20° / 16°30.612.37.6
Nov21° / 17°30.712.67.6
Dec23° / 18°61.712.77.5

Cloud cover in October

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 22% of the time in October.

Beyond those clear spells, partly cloudy skies cover about 26% of October, with mostly cloudy or overcast conditions the remaining 52%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
16139
26238
36238
46238
56238
66139
76040
86139
96040
105842
115743
125545
135446
145248
155050
164852
174654
184456
194357
204159
214060
223862
233763
243565
253466
263466
273367
283268
293268
303466
313466

Chance of precipitation in October

Any precipitation

San Isidro gets around 3 mm of rain over 0.6 wet days in October. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 2% and peaks near 2% on the wettest days.

0%10%20%30%151015202531
Rain chance (%)
12
22
32
42
52
62
72
82
92
102
112
122
132
142
152
162
172
182
192
202
212
222
232
242
252
262
272
282
292
302
312

Humidity in October

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, October lands in the comfortable band about 75% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)
136622
235632
334642
433652
532662
631672
730682
829692
929692
1028702
1127712
1226722
1325723
1424733
1523743
1622753
1721763
1820764
1919774
2018784
2117794
2216795
2315805
2414815
2513825
2612826
2711836
2811836
2910837
3010837
319847

Wind in October

Winds average 10 km/h in October.

Across October, 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
111calm
211calm
311calm
411calm
511calm
611calm
710calm
810calm
910calm
1010calm
1110calm
1210calm
1310calm
1410calm
1510calm
1610calm
1710calm
1810calm
1910calm
2010calm
2110calm
2210calm
2310calm
2410calm
2510calm
2610calm
2710calm
2810calm
2910calm
3010calm
3110calm

Sunrise & sunset in October

DaylightNight

Daylight runs from about 12 h 06 min at the start of October to 12 h 24 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 18 minutes over October. Sunrise moves from 5:54 AM to 5:39 AM, and sunset from 6:00 PM to 6:05 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
112.15:546:00
212.15:536:00
312.15:536:00
412.15:526:00
512.25:516:00
612.25:516:01
712.25:506:01
812.25:496:01
912.25:496:01
1012.25:486:01
1112.25:486:01
1212.25:476:01
1312.25:476:01
1412.35:466:01
1512.35:466:01
1612.35:456:01
1712.35:446:02
1812.35:446:02
1912.35:436:02
2012.35:436:02
2112.35:436:02
2212.35:426:02
2312.35:426:03
2412.45:416:03
2512.45:416:03
2612.45:416:03
2712.45:406:04
2812.45:406:04
2912.45:396:04
3012.45:396:04
3112.45:396:05

Solar energy in October

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in October, about 6.67 kWh/m².

For context, solar energy here swings from a low near 4.86 kWh/m² to a high of 6.88 kWh/m² in November across the year — October's 6.67 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
16.5Intense
26.5Intense
36.5Intense
46.6Intense
56.6Intense
66.6Intense
76.6Intense
86.6Intense
96.7Intense
106.7Intense
116.7Intense
126.7Intense
136.7Intense
146.7Intense
156.7Intense
166.7Intense
176.7Intense
186.7Intense
196.7Intense
206.7Intense
216.7Intense
226.7Intense
236.7Intense
246.7Intense
256.7Intense
266.7Intense
276.8Intense
286.8Intense
296.8Intense
306.8Intense
316.8Intense
Planning a trip in October

Is October a good time to visit San Isidro?

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

7.6
Sightseeing
7th-best month of the year
4.2
Beach & pool
9th-best month of the year

October is one of the better times to visit San Isidro for general sightseeing.

What to pack for San Isidro in October

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

In October, San Isidro sees daytime highs around 20°C and nights near 16°C. Pack sun protection.

sun protection

Sea temperature near San Isidro in October

The nearest coast averages about 17°C in October — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea offshore is warmest in February at about 22°C and coldest in September near 17°C.

It's comfortable for a long swim from Jan 1 to Apr 9 — about 3.3 months when the water holds above 20°C.

16°18°20°22°JanFebMarAprMayJunJulAugSepOctNovDeccoolrefreshingcomfortable to swim
Sea temperature (°C)Comfort
Jan21Refreshing
Feb22Refreshing
Mar21Refreshing
Apr20Cool
May19Cool
Jun18Cool
Jul18Cool
Aug17Cool
Sep17Cool
Oct17Cool
Nov18Cool
Dec19Cool

UV index in San Isidro in October

LowModerateHighVery highExtreme

Clear-sky midday UV in October peaks around 13 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in San Isidro peaks around February 12 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 22 at about 8 (very high).

The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highExtremeFeb 12UV 15Jun 22UV 8
UV index (midday)Level
Jan14Extreme
Feb16Extreme
Mar13Extreme
Apr12Extreme
May10Very high
Jun8Very high
Jul8Very high
Aug10Extreme
Sep10Extreme
Oct13Extreme
Nov12Extreme
Dec13Extreme

Air quality in San Isidro in October

GoodModeratePoorUnhealthyVery unhealthy

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

Air quality in San Isidro is worst in March — around 23 µg/m³ PM2.5 (moderate), and holds fairly steady the rest of the year.

Modeled monthly averages (CAMS reanalysis, 2015–2024).

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateMar 2023 µg/m³Nov 2017 µg/m³
PM2.5 (µg/m³)Level
Jan17Moderate
Feb20Moderate
Mar23Moderate
Apr22Moderate
May23Moderate
Jun22Moderate
Jul20Moderate
Aug19Moderate
Sep18Moderate
Oct18Moderate
Nov17Moderate
Dec17Moderate
Location & terrain

Where is San Isidro?

San Isidro sits at 12.1°S, 77.0°W, 109 m above sea level, in Peru. The nearest listed city is Miraflores, 2.0 km away.

Topography around San Isidro

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

Within 3 km, the terrain around San Isidro has only modest variations in elevation — a maximum elevation change of 148 m around an average of 91 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 1,046 m; within 80 km, extreme variations in elevation — a maximum elevation change of 4,960 m.

The land around San Isidro is covered by artificial surfaces (83%) within 3 km, artificial surfaces (48%) and water (34%) within 16 km, and water (45%) and bare terrain (30%) within 80 km.

3 km
148 m
16 km
1,046 m
80 km
4,960 m
treesshrubsgrasslandcroplandartificial surfacesbare terrainwater
October weather nearby: Miraflores 2.0 km · Jesus Maria 3.0 km · Breña 5.0 km · San Francisco De Borja 5.0 km · Barranco 6.0 km · Santiago de Surco 6.0 km · Lima 6.0 km · Carmen De La Legua Reynoso 8.0 km

Peru travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type A / B / C
220 V · 60 Hz
Prices
≈ 51% of US
price level, 2025
GDP per capita
$9,684
2025
Happiness
6.0 / 10
World Happiness, 2025
Safe drinking water
49%
of population, 2024
Homicide rate
8.6
per 100k, 2021
Road deaths
13.6
per 100k/yr, 2019
Income group
Upper middle
World Bank
English
Moderate
EF EPI 519
Religion
Catholic 76%Evangelical Christian 16%no religion 5%other religions 3%

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 Isidro (-12.0966°, -77.0426°, elevation 109 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).