San Martin weather in October

In October, San Martin sees average daytime highs of 27°C and overnight lows near 18°C, with 4 mm of rain across 1.5 wet days and about 12.1 hours of daylight. It is the 9th-warmest and 8th-wettest month of the year here.

Day-to-day highs hold fairly steady near 27°C through the month. The sky is clear or mostly clear about 40% of the time in October, and the air most often feels comfortable.

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

Daytime high
27°
9th warmest
Overnight low
18°
3rd coldest
Rainfall
4 mm
1.5 wet days
Daylight
12 h 06 min
6:04 AM – 6:11 PM
Cloud cover
52%
6th clearest
Wind
13 km/h
2nd windiest
Solar energy
6.68 kWh/m²
Travel score
7.8
out of 10

Temperature in October

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 27°C through the month.

A typical October day in San Martin reaches about 27°C in the afternoon and slips back to 18°C overnight — a 10°C spread between the day's warmth and the night's chill. On most days the high lands between 26°C and 29°C. Set against its neighbours, October runs about 1°C warmer than September and about 1°C cooler than November.

15°20°25°30°151015202531
Avg high (°C)Avg low (°C)
12718
22718
32718
42718
52718
62718
72718
82718
92718
102718
112718
122718
132718
142718
152718
162718
172718
182718
192718
202718
212818
222818
232818
242818
252818
262818
272818
282818
292818
302818
312818

How October really feels in San Martin

Once humidity and wind are folded in, October 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

October sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

San Martin weather by month

How October compares with the rest of the year at a glance. October 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° / 22°375.512.34.6
Feb32° / 23°629.412.23.7
Mar32° / 23°10711.2123.5
Apr32° / 22°386.411.94.5
May30° / 20°72.311.86.0
Jun28° / 19°30.911.77.9
Jul26° / 18°10.211.78.5
Aug26° / 17°00.111.88.8
Sep27° / 17°20.6128.3
Oct27° / 18°41.512.17.8
Nov28° / 18°82.212.27.0
Dec30° / 20°214.912.35.7

Cloud cover in October

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 40% of the time in October.

Beyond those clear spells, partly cloudy skies cover about 20% of October, with mostly cloudy or overcast conditions the remaining 40%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
16634
26634
36535
46535
56436
66436
76337
86337
96337
106238
116238
126139
136139
146040
156040
166040
176040
186040
195941
205842
215842
225842
235743
245644
255545
265545
275446
285446
295446
305347
315248

Chance of precipitation in October

Any precipitation

San Martin gets around 4 mm of rain over 1.5 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 5% and peaks near 7% on the wettest days.

0%10%20%30%151015202531
Rain chance (%)
12
22
32
42
52
62
72
82
93
103
113
124
134
144
155
165
175
186
196
206
216
227
237
247
257
267
277
287
297
307
317

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 50% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Comfortable (%)Humid (%)Muggy (%)
162362
262362
361372
461372
561372
660382
760382
859392
959401
1058411
1157421
1256431
1355441
1454451
1553461
1652471
1750491
1849501
1948511
2046531
2145541
2243561
2342571
2441572
2540582
2639592
2738602
2838602
2937603
3036613
3136613

Wind in October

Winds average 13 km/h in October.

Across October, daily wind ranges from about 13 km/h on the calmest days to 13 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202531
Wind speed (km/h)Feels
113light breeze
213light breeze
313light breeze
413light breeze
513light breeze
613light breeze
713light breeze
813light breeze
913light breeze
1013light breeze
1113light breeze
1213light breeze
1313light breeze
1413light breeze
1513light breeze
1613light breeze
1713light breeze
1813light breeze
1913light breeze
2013light breeze
2113light breeze
2213light breeze
2313light breeze
2413light breeze
2513light breeze
2613light breeze
2713light breeze
2813light breeze
2913light breeze
3013light breeze
3113light breeze

Sunrise & sunset in October

DaylightNight

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

Days grow by about 12 minutes over October. Sunrise moves from 6:10 AM to 6:01 AM, and sunset from 6:13 PM to 6:12 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
112.06:106:13
212.06:106:13
312.16:096:13
412.16:096:13
512.16:086:12
612.16:086:12
712.16:086:12
812.16:076:12
912.16:076:12
1012.16:066:12
1112.16:066:12
1212.16:066:11
1312.16:056:11
1412.16:056:11
1512.16:056:11
1612.16:046:11
1712.16:046:11
1812.16:046:11
1912.16:036:11
2012.16:036:11
2112.16:036:11
2212.16:026:11
2312.16:026:11
2412.26:026:11
2512.26:026:11
2612.26:026:11
2712.26:016:11
2812.26:016:11
2912.26:016:11
3012.26:016:12
3112.26:016:12

Solar energy in October

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in October, about 6.68 kWh/m² — the sunniest month for solar.

For context, solar energy here swings from a low near 5.39 kWh/m² to a high of 6.68 kWh/m² in October across the year — October's 6.68 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
16.7Intense
26.7Intense
36.7Intense
46.7Intense
56.7Intense
66.7Intense
76.7Intense
86.7Intense
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
276.7Intense
286.7Intense
296.7Intense
306.7Intense
316.7Intense
Planning a trip in October

Is October a good time to visit San Martin?

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

7.8
Sightseeing
5th-best month of the year
8.1
Beach & pool
6th-best month of the year

October is one of the better times to visit San Martin for general sightseeing. The water and warmth also suit a beach or pool day.

What to pack for San Martin in October

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

In October, San Martin sees daytime highs around 27°C and nights near 18°C. Pack light clothes and sun protection.

light clothessun protection

Sea temperature near San Martin in October

The nearest coast averages about 18°C in October — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 54 km away) is warmest in February at about 23°C and coldest in September near 18°C.

It's comfortable for a long swim from Dec 25 to May 15 — about 4.7 months when the water holds above 20°C.

16°18°20°22°24°JanFebMarAprMayJunJulAugSepOctNovDeccoolrefreshingwarmcomfortable to swim
Sea temperature (°C)Comfort
Jan21Refreshing
Feb23Refreshing
Mar23Refreshing
Apr21Refreshing
May20Refreshing
Jun19Cool
Jul18Cool
Aug18Cool
Sep18Cool
Oct18Cool
Nov19Cool
Dec20Cool

UV index in San Martin in October

LowModerateHighVery highExtreme

Clear-sky midday UV in October peaks around 14 (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 Martin peaks around February 19 at about 16 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 22 at about 10 (extreme).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeFeb 19UV 16Jun 22UV 10
UV index (midday)Level
Jan15Extreme
Feb16Extreme
Mar16Extreme
Apr13Extreme
May12Extreme
Jun10Very high
Jul10Extreme
Aug11Extreme
Sep12Extreme
Oct14Extreme
Nov13Extreme
Dec13Extreme
Location & terrain

Where is San Martin?

San Martin sits at 5.2°S, 80.7°W, 35 m above sea level, in Peru. The nearest listed city is Piura, 1.0 km away.

Topography around San Martin

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

Within 3 km, the terrain around San Martin has only modest variations in elevation — a maximum elevation change of 26 m around an average of 35 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 127 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,178 m.

The land around San Martin is covered by artificial surfaces (57%) and bare terrain (25%) within 3 km, bare terrain (58%) within 16 km, and bare terrain (36%) and shrubs (26%) within 80 km.

3 km
26 m
16 km
127 m
80 km
2,178 m
treesshrubsgrasslandcroplandartificial surfacesbare terrainwater
October weather nearby: Piura 1.0 km · Catacaos 9.0 km · La Unión 25 km · Sullana 31 km · Marcavelica 34 km · Querecotillo 39 km · Sechura 45 km · Tambo Grande 46 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 Martin (-5.1859°, -80.6693°, elevation 35 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).