Climate averages 1991–2020
Merlo weather
in May.
A mild, moderately wet month: the 9th warmest and the 4th driest of the year. Meets the pleasant-weather rule
Long-term climate patterns, not a forecast for a particular trip.
May is a mild month in Merlo: daytime highs average 18.0°C and nights cool to about 10.0°C. By daytime temperature it is the 9th warmest of the 12 months.
Expect about 62 mm of rain on roughly 6 days, which makes May a moderately wet month (the 4th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 10 h 20 min on an average May day.
The nearest other city in this atlas is Moreno (7 km away). In May its highs average 18.0°C, about as warm as Merlo, with 62 mm of rain.
Among the 67 cities listed in Argentina, Merlo ranks joint 34th of 67 for the warmest May highs and joint 35th of 67 for the driest May (rainfall, lowest first). The mean May high of those 67 cities is 18.0°C; Merlo is level with that mean.
From May to June, average highs fall by 3.0°C to 15.0°C, and monthly rainfall falls from 62 mm to 58 mm.
The annual picture
May in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Merlo climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 29.2°C19.2°C | 19.2°C | 88 | 7.7 | 14.214 h |
| February | 27.8°C18.4°C | 18.4°C | 94 | 8.3 | 13.413 h |
| March | 25.7°C16.7°C | 16.7°C | 85 | 7.5 | 12.312 h |
| April | 21.8°C13.1°C | 13.1°C | 91 | 8.1 | 11.211 h |
| May, selected | 18.0°C10.0°C | 10.0°C | 62 | 6.2 | 10.310 h |
| June | 15.0°C7.1°C | 7.1°C | 58 | 5.9 | 9.910 h |
| July | 14.2°C6.0°C | 6.0°C | 57 | 6.0 | 10.110 h |
| August | 16.6°C7.4°C | 7.4°C | 60 | 5.8 | 10.811 h |
| September | 18.5°C9.1°C | 9.1°C | 71 | 6.7 | 11.812 h |
| October | 21.3°C11.9°C | 11.9°C | 111 | 9.2 | 12.913 h |
| November | 24.7°C14.6°C | 14.6°C | 92 | 8.4 | 13.914 h |
| December | 27.9°C17.4°C | 17.4°C | 87 | 8.6 | 14.414 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
May in nearby cities
- Moreno in MayArgentina · 7 kmHigh 18.0°C · Low 9.9°C · 62 mm rain
- Bella Vista in MayArgentina · 12 kmHigh 17.9°C · Low 10.2°C · 65 mm rain
- Isidro Casanova in MayArgentina · 13 kmHigh 17.8°C · Low 10.2°C · 61 mm rain
- San Miguel, Argentina in MayArgentina · 14 kmHigh 17.8°C · Low 10.3°C · 65 mm rain
- Laferrere in MayArgentina · 16 kmHigh 17.8°C · Low 10.1°C · 61 mm rain
- José C. Paz in MayArgentina · 17 kmHigh 17.9°C · Low 10.0°C · 65 mm rain
- Don Torcuato in MayArgentina · 21 kmHigh 17.7°C · Low 10.8°C · 65 mm rain
- Ezeiza in MayArgentina · 28 kmHigh 17.8°C · Low 10.0°C · 61 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Merlo) is explained once on the Merlo year overview and on the Sources, method and limits page.
Moreno lies in the same rainfall cell, so its rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.