Merlo weather in October
In October, Merlo has daytime highs averaging 21 °C, nights around 12 °C, with 9.1 wet days. Figures are 1991–2020 climate normals.
- 21.3°C Average high
- 12.1°C Average low
- 9.1days Wet days
- 111mm Rainfall
- 13h Daylight
Daily temperatures through October
How October develops
Averages for the first, middle and last part of the month, from daily 1991–2020 normals. Chance of rain is the share of years in which that calendar day recorded more than 1 mm.
| Days | Avg high | Avg low | Chance of rain |
|---|---|---|---|
| 1–10 October | 20.0 °C | 11.0 °C | 27 % |
| 11–20 October | 21.6 °C | 12.5 °C | 30 % |
| 21–31 October | 22.2 °C | 12.8 °C | 30 % |
- Average highs rise from 20.0 °C early in October to 22.2 °C by the end of it.
What to expect
| Measure | Typical October | Share of the month |
|---|---|---|
| Days above 25 °C | 4.8 of 31 | 16 % |
| Days above 30 °C | 0.4 of 31 | 1 % |
| Days below 0 °C | 0 of 31 | 0 % |
| Days with more than 1 mm rain | 9.1 of 31 | 29 % |
Conditions in October
| Measure | Average |
|---|---|
| Mean temperature | 16 °C |
| Record high (1991–2020) | 33 °C |
| Record low (1991–2020) | 1.5 °C |
| Relative humidity | 72 % |
| Wind speed | 20 km/h |
| Cloud cover | 53 % |
Where Merlo ranks in October
| Ranking | Position | Value |
|---|---|---|
| Places with the best weather in South America in October | 34th of 50 | 87/100 |
October compared with the months around it
| Month | Avg high | Rainfall | Cloud |
|---|---|---|---|
| August | 16.7 °C | 61 mm | 51 % |
| September | 18.5 °C | 71 mm | 51 % |
| October | 21.3 °C | 111 mm | 53 % |
| November | 24.7 °C | 92 mm | 45 % |
| December | 27.9 °C | 88 mm | 40 % |
See all twelve months for Merlo
- October is the 7th warmest month here.
- It is the 12th driest month of the year.
- It ranks 9th for least cloud cover.
- Days last about 13 hours from sunrise to sunset.
- It rains on 9.1 of 31 days — 29 % of the month.
- Nights are about 9.2 °C cooler than the middle of the day.
- The hottest October day on record since 1991 reached 33 °C, 12 °C above the usual daytime high.
QuestionsOctober in Merlo, answered
How warm is Merlo in October?
Daily highs average 21 °C and nights fall to about 12 °C, a spread of 9.2 °C between afternoon and dawn. That makes October the 7th warmest month of the year here.
Does it rain much in Merlo in October?
October averages 111 mm of rain, spread over about 9 of the 31 days — 29 % of the month. Cloud cover averages 53 % of the sky.
How long are the days in October?
Merlo averages 13 hours between sunrise and sunset in October. Day length is computed from latitude and date, so it is exact rather than modelled — but it says nothing about how much of that time is sunny.
Data sources and method
- ERA5 / ERA5-Land reanalysis — Copernicus Climate Change Service (C3S), ECMWF. Copernicus Licence
- Open-Meteo — Open-Meteo.com. CC BY 4.0
- NOAA OISST v2.1 — NOAA Physical Sciences Laboratory. Public domain
- GeoNames — GeoNames.org. CC BY 4.0
- Normal period
- 1991–2020
- Dataset version
- era5-1991-2020-scores1.1
- Last processed
Measured values come from ERA5 reanalysis and are reproduced unchanged. Calculated by us: daylight hours, beach and comfort scores, monthly rankings, threshold day counts, chance of a wet day by date, ten-day averages within the month. Full formulas are on the methodology page.
Contains modified Copernicus Climate Change Service information 2026. Neither the European Commission nor ECMWF is responsible for any use that may be made of the Copernicus information or data it contains.