Merlo weather in October

In October, Merlo sees average daytime highs of 22°C and overnight lows near 12°C, with 111 mm of rain across 9.3 wet days and about 12.9 hours of daylight. It is the 7th-warmest and 1st-wettest month of the year here.

Highs climb over the month, from about 20°C in the first days to 23°C by the end. The sky is clear or mostly clear about 37% of the time in October, and the air most often feels dry.

Daylight stretches from about 12 h 18 min at the start of October to 13 h 24 min by month's end. Set against the rest of the year, October is Merlo's 9th-clearest and 2nd-windiest month. For the whole year in context, see Merlo's year-round climate.

Daytime high
22°
7th warmest
Overnight low
12°
6th coldest
Rainfall
111 mm
9.3 wet days
Daylight
12 h 54 min
6:13 AM – 7:07 PM
Cloud cover
56%
9th clearest
Wind
14 km/h
2nd windiest
Solar energy
5.53 kWh/m²
Travel score
6.8
out of 10

Merlo is city in the province of Buenos Aires in Argentina.

Founded
1755

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

Temperature in October

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 20°C in the first days to 23°C by the end.

A typical October day in Merlo reaches about 22°C in the afternoon and slips back to 12°C overnight — a 10°C spread between the day's warmth and the night's chill. On most days the high lands between 17°C and 27°C. Set against its neighbours, October runs about 3°C warmer than September and about 3°C cooler than November.

10°15°20°25°30°151015202531
Avg high (°C)Avg low (°C)
12010
22010
32010
42010
52011
62011
72111
82111
92111
102111
112111
122111
132112
142212
152212
162212
172212
182212
192212
202212
212212
222212
232212
242212
252312
262312
272312
282313
292313
302313
312313

Merlo weather by month

How October compares with the rest of the year at a glance. October is the 7th-warmest and 1st-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan29° / 18°887.714.15.9
Feb28° / 18°938.313.36.4
Mar26° / 16°857.512.37.3
Apr22° / 12°918.111.27.2
May18° / 626.210.26.5
Jun15° / 585.99.75.1
Jul15° / 5769.94.8
Aug17° / 605.910.75.9
Sep19° / 716.811.86.6
Oct22° / 12°1119.312.96.8
Nov25° / 14°928.413.87.2
Dec28° / 17°878.614.36.5

Cloud cover in October

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 37% of the time in October.

Beyond those clear spells, partly cloudy skies cover about 14% of October, with mostly cloudy or overcast conditions the remaining 50%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14852
24852
34753
44753
54753
64654
74654
84654
94753
104753
114951
124951
134951
145050
155050
165050
175050
185050
195149
205149
215149
225248
235248
245248
255347
265347
275347
285446
295545
305545
315545

Chance of precipitation in October

Any precipitation

Merlo gets around 111 mm of rain over 9.3 wet days in October, the wettest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 29% and peaks near 30% on the wettest days.

0%10%20%30%40%151015202531
Rain chance (%)
126
227
327
428
528
629
729
829
929
1029
1129
1230
1330
1430
1530
1630
1730
1830
1930
2030
2130
2230
2330
2430
2530
2629
2729
2829
2929
3029
3129

Humidity in October

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, October lands in the dry band about 63% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)
1771850
2761950
3742060
4742060
5722170
6702280
7692281
8672391
9672391
106623101
116524101
126424111
136424111
146424111
156225121
166225121
176225121
186026122
195926132
205926132
215926132
225926132
235926132
245826142
255826142
265727142
275727142
285628142
295528152
305429152
315329162

Wind in October

Winds average 14 km/h in October.

Across October, daily wind ranges from about 14 km/h on the calmest days to 14 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202531
Wind speed (km/h)Feels
114light breeze
214light breeze
314light breeze
414light breeze
514light breeze
614light breeze
714light breeze
814light breeze
914light breeze
1014light breeze
1114light breeze
1214light breeze
1314light breeze
1414light breeze
1514light breeze
1614light breeze
1714light breeze
1814light breeze
1914light breeze
2014light breeze
2114light breeze
2214light breeze
2314light breeze
2414light breeze
2514light breeze
2614light breeze
2714light breeze
2814light breeze
2914light breeze
3014light breeze
3114light breeze

Sunrise & sunset in October

DaylightNight

Daylight runs from about 12 h 18 min at the start of October to 13 h 24 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 66 minutes over October. Sunrise moves from 6:34 AM to 5:57 AM, and sunset from 6:54 PM to 7:20 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
112.36:346:54
212.46:326:55
312.46:316:56
412.56:296:57
512.56:286:57
612.56:276:58
712.66:256:59
812.66:247:00
912.66:227:01
1012.76:217:01
1112.76:207:02
1212.76:187:03
1312.86:177:04
1412.86:167:05
1512.96:157:06
1612.96:137:07
1712.96:127:07
1813.06:117:08
1913.06:107:09
2013.06:097:10
2113.16:077:11
2213.16:067:12
2313.16:057:13
2413.26:047:14
2513.26:037:15
2613.26:027:15
2713.36:017:16
2813.36:007:17
2913.35:597:18
3013.45:587:19
3113.45:577:20

Solar energy in October

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in October, about 5.53 kWh/m².

For context, solar energy here swings from a low near 2.24 kWh/m² to a high of 7.45 kWh/m² in December across the year — October's 5.53 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
15.0Bright
25.0Bright
35.0Bright
45.1Bright
55.1Bright
65.1Bright
75.2Bright
85.2Bright
95.3Bright
105.3Bright
115.3Bright
125.4Bright
135.4Bright
145.5Bright
155.5Bright
165.6Bright
175.6Bright
185.7Bright
195.7Bright
205.8Bright
215.8Bright
225.9Bright
235.9Bright
245.9Bright
256.0Bright
266.0Intense
276.1Intense
286.1Intense
296.1Intense
306.2Intense
316.2Intense
Planning a trip in October

Is October a good time to visit Merlo?

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

6.8
Sightseeing
4th-best month of the year
4.5
Beach & pool
7th-best month of the year

October is a reasonable time to visit Merlo for sightseeing.

What to pack for Merlo in October

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

In October, Merlo sees daytime highs around 22°C and nights near 12°C. Worth packing: rain gear and sun protection. About 9 days see rain.

rain gearsun protection

Sea temperature near Merlo 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 33 km away) is warmest in January at about 25°C and coldest in July near 13°C.

It's comfortable for a long swim from Nov 9 to Apr 20 — about 5.4 months when the water holds above 20°C.

10°15°20°25°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmcomfortable to swimcomfortable to swim
Sea temperature (°C)Comfort
Jan25Warm
Feb25Warm
Mar23Refreshing
Apr21Refreshing
May17Cool
Jun14Bracing
Jul13Bracing
Aug13Bracing
Sep15Cool
Oct18Cool
Nov21Refreshing
Dec23Refreshing

UV index in Merlo in October

LowModerateHighVery highExtreme

Clear-sky midday UV in October peaks around 8 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Merlo peaks around January 13 at about 12 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 19 at about 3 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 10 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highModerateHighVery highExtremeJan 13UV 12Jun 19UV 3
UV index (midday)Level
Jan13Extreme
Feb11Extreme
Mar9Very high
Apr6High
May3Moderate
Jun3Moderate
Jul3Moderate
Aug4Moderate
Sep6High
Oct8Very high
Nov11Extreme
Dec12Extreme

Air quality in Merlo 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 Merlo is worst in June — around 25 µg/m³ PM2.5 (moderate), about 2.0× the cleanest month (December, 12 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateJun 2325 µg/m³Dec 1612 µg/m³
PM2.5 (µg/m³)Level
Jan13Moderate
Feb14Moderate
Mar16Moderate
Apr17Moderate
May22Moderate
Jun25Moderate
Jul25Moderate
Aug24Moderate
Sep19Moderate
Oct16Moderate
Nov13Moderate
Dec12Moderate
Location & terrain

Where is Merlo?

Merlo sits at 34.7°S, 58.7°W, 13 m above sea level, in Argentina. The nearest listed city is San Antonio de Padua, 3.0 km away.

Topography around Merlo

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

Within 3 km, the terrain around Merlo has only modest variations in elevation — a maximum elevation change of 30 m around an average of 19 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 50 m; within 80 km, only modest variations in elevation — a maximum elevation change of 84 m.

The land around Merlo is covered by artificial surfaces (75%) within 3 km, artificial surfaces (47%) and trees (23%) within 16 km, and grassland (30%) and cropland (27%) within 80 km.

3 km
30 m
16 km
50 m
80 km
84 m
treesgrasslandcroplandartificial surfaceswaterwetland
October weather nearby: San Antonio de Padua 3.0 km · Moreno 7.0 km · Castelar 8.0 km · Pontevedra 10 km · Morón 10 km · Bella Vista 12 km · Hurlingham 12 km · Muñiz 12 km

Argentina travel facts

Travel advisory
Level 1
Exercise Normal Precautions
Power plugs
Type C / I
220 V · 50 Hz
Prices
≈ 46% of US
price level, 2025
GDP per capita
$14,898
2025
Happiness
6.4 / 10
World Happiness, 2025
Homicide rate
4.5
per 100k, 2023
Road deaths
14.1
per 100k/yr, 2019
Income group
Upper middle
World Bank
English
High
EF EPI 575
Religion
Roman Catholic 63%none 19%Evangelical 15%Jehovah's Witness and Church of Jesus 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 Merlo (-34.6654°, -58.7274°, elevation 13 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).