Merlo climate
Merlo is warmest in January, with average highs of 29 °C, and coldest in July, when nights average 6.2 °C. October is the wettest month (111 mm) and June the driest (58 mm). Figures are 1991–2020 climate normals.
Across a full year Merlo averages 979 mm of rain, 119 days above 25 °C and 3 days below freezing.
Argentina · population 268,961 · 1991–2020 normals
Temperature below 0 °C to above 30 °C Rain band height is that month’s share of the wettest month
- Warmest month January 29 °C
- Coldest month July 6.2 °C
- Driest month June 58 mm
- Wettest month October 111 mm
- Least cloud January 40 % cloud
- Hottest on record December 40 °C
- Coldest on record June -3.9 °C
What to expectMerlo through the year
Merlo has a clear annual cycle: average daily highs run from 14 °C in July to 29 °C in January, a swing of 14 °C in mean temperature across the year.
Counted across a normal year, 119 days a year reach 25 °C, 35 of them reach 30 °C, 3 nights drop below freezing. The warmest reading in the 1991–2020 record is 40 °C, in December.
Rain is spread fairly evenly through the year, from 58 mm in June to 111 mm in October. There is no dry season to aim for.
Month by month
| Month | Avg high | Rainfall | Cloud |
|---|---|---|---|
| January | 29.1 °C | 93 mm | 40 % |
| February | 27.7 °C | 93 mm | 41 % |
| March | 25.7 °C | 90 mm | 43 % |
| April | 21.8 °C | 94 mm | 48 % |
| May | 18.0 °C | 66 mm | 55 % |
| June | 15.0 °C | 58 mm | 55 % |
| July | 14.2 °C | 61 mm | 54 % |
| 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 % |
Temperature month by month
| Month | Avg high | Avg low | Mean | Record high | Record low | Days above 25 °C | Days above 30 °C | Days below 0 °C |
|---|---|---|---|---|---|---|---|---|
| January | 29.1 °C | 19.2 °C | 23.9 °C | 38.9 °C | 10.7 °C | 27 | 12 | 0 |
| February | 27.7 °C | 18.5 °C | 22.9 °C | 36.4 °C | 8.7 °C | 22 | 8 | 0 |
| March | 25.7 °C | 16.8 °C | 20.9 °C | 33.8 °C | 6.8 °C | 17 | 3 | 0 |
| April | 21.8 °C | 13.3 °C | 17.2 °C | 32.7 °C | 3.1 °C | 6 | 0 | 0 |
| May | 18.0 °C | 10.2 °C | 13.7 °C | 28.9 °C | -1.5 °C | 1 | 0 | 0 |
| June | 15.0 °C | 7.3 °C | 10.7 °C | 25.4 °C | -3.9 °C | 0 | 0 | 1 |
| July | 14.2 °C | 6.2 °C | 9.8 °C | 25.7 °C | -2.8 °C | 0 | 0 | 2 |
| August | 16.7 °C | 7.6 °C | 11.7 °C | 31.3 °C | -1.9 °C | 1 | 0 | 1 |
| September | 18.5 °C | 9.2 °C | 13.5 °C | 31.6 °C | -0.7 °C | 2 | 0 | 0 |
| October | 21.3 °C | 12.1 °C | 16.5 °C | 33.3 °C | 1.5 °C | 5 | 0 | 0 |
| November | 24.7 °C | 14.7 °C | 19.6 °C | 35.3 °C | 3.7 °C | 14 | 2 | 0 |
| December | 27.9 °C | 17.4 °C | 22.5 °C | 39.5 °C | 7.8 °C | 24 | 9 | 0 |
Rain, sun and wind month by month
| Month | Rainfall | Wet days | Daylight | Cloud cover | Humidity | Wind |
|---|---|---|---|---|---|---|
| January | 93 mm | 7 | 14 h/day | 40 % | 65 % | 19 km/h |
| February | 93 mm | 8 | 13 h/day | 41 % | 69 % | 18 km/h |
| March | 90 mm | 7 | 12 h/day | 43 % | 72 % | 18 km/h |
| April | 94 mm | 8 | 11 h/day | 48 % | 75 % | 18 km/h |
| May | 66 mm | 6 | 10 h/day | 55 % | 79 % | 17 km/h |
| June | 58 mm | 6 | 9.8 h/day | 55 % | 79 % | 18 km/h |
| July | 61 mm | 6 | 10 h/day | 54 % | 78 % | 18 km/h |
| August | 61 mm | 6 | 11 h/day | 51 % | 75 % | 19 km/h |
| September | 71 mm | 7 | 12 h/day | 51 % | 72 % | 20 km/h |
| October | 111 mm | 9 | 13 h/day | 53 % | 72 % | 20 km/h |
| November | 92 mm | 8 | 14 h/day | 45 % | 67 % | 20 km/h |
| December | 88 mm | 8 | 14 h/day | 40 % | 64 % | 20 km/h |
Where Merlo ranks
| Ranking | Position | Value |
|---|---|---|
| The coolest places in South America in July | 21st of 50 | 14 °C |
| The coolest places in South America in June | 23rd of 50 | 15 °C |
| Places with the best weather in South America in April | 25th of 50 | 90/100 |
| The coolest places in South America in August | 29th of 50 | 17 °C |
| Places with the best weather in South America in March | 31st of 50 | 87/100 |
| The coolest places in South America in September | 33rd of 50 | 19 °C |
Planning a trip? See the best time to visit Merlo.
QuestionsCommon questions about Merlo’s climate
When is the best time to visit Merlo?
That depends on what you want, so the honest answer is a comparison rather than a single month. March, November, December sit closest to 20 °C on average, January is the warmest month and June the driest. The month-by-month table above has the full picture.
How hot does Merlo get?
In January, the warmest month, daily highs average 29 °C. About 35 days a year pass 30 °C. The highest value in the 1991–2020 record is 40 °C.
How cold does it get in winter?
Nights average 6.2 °C in July, the coldest month. A normal year has 3 nights below freezing.
Which month is wettest in Merlo?
October, averaging 111 mm over 9 days with rain. The driest month is June with 58 mm. The year as a whole averages 979 mm.
Are these figures a forecast?
No. They are 1991–2020 climate normals: the average of thirty years, which describes what a month is usually like in Merlo rather than what any particular week will bring. Individual years can differ substantially from the normal.
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
- Data point
- -34.665°, -58.727° (the coordinates the reanalysis values are taken for)
- Dataset version
- era5-1991-2020-scores1.1
- Last processed
Measured values come from ERA5 reanalysis and are reproduced unchanged. Calculated by us: monthly rankings, daylight hours, beach and comfort scores. 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.