Climate averages 1991–2020
Luján weather
in September.
A mild, moderately wet month: the 8th warmest and the 5th driest of the year. Meets the pleasant-weather rule
Long-term climate patterns, not a forecast for a particular trip.
September is a mild month in Luján: daytime highs average 18.8°C and nights cool to about 8.8°C. By daytime temperature it is the 8th warmest of the 12 months.
Expect about 71 mm of rain on roughly 7 days, which makes September a moderately wet month (the 5th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 11 h 51 min on an average September day.
The nearest other city in this atlas is Pilar (22 km away). In September its highs average 18.6°C, about as warm as Luján, with 71 mm of rain.
Among the 67 cities listed in Argentina, Luján ranks 35th of 67 for the warmest September highs and joint 37th of 67 for the driest September (rainfall, lowest first). The mean September high of those 67 cities is 19.4°C; Luján is 0.6°C cooler than that mean.
From September to October, average highs rise by 2.8°C to 21.6°C, and monthly rainfall rises from 71 mm to 119 mm.
The annual picture
September 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
Luján climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 29.4°C18.8°C | 18.8°C | 91 | 7.8 | 14.214 h |
| February | 27.9°C18.0°C | 18.0°C | 101 | 8.3 | 13.413 h |
| March | 25.9°C16.3°C | 16.3°C | 92 | 7.3 | 12.312 h |
| April | 22.0°C12.8°C | 12.8°C | 96 | 8.3 | 11.211 h |
| May | 18.2°C9.8°C | 9.8°C | 66 | 5.9 | 10.310 h |
| June | 15.2°C6.9°C | 6.9°C | 54 | 5.8 | 9.910 h |
| July | 14.4°C5.8°C | 5.8°C | 58 | 5.8 | 10.110 h |
| August | 16.9°C7.1°C | 7.1°C | 61 | 5.5 | 10.811 h |
| September, selected | 18.8°C8.8°C | 8.8°C | 71 | 6.5 | 11.812 h |
| October | 21.6°C11.6°C | 11.6°C | 119 | 9.3 | 12.913 h |
| November | 25.0°C14.3°C | 14.3°C | 94 | 8.2 | 13.914 h |
| December | 28.1°C17.1°C | 17.1°C | 93 | 8.8 | 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
September in nearby cities
- Pilar in SeptemberArgentina · 22 kmHigh 18.6°C · Low 8.9°C · 71 mm rain
- Moreno in SeptemberArgentina · 31 kmHigh 18.5°C · Low 9.0°C · 71 mm rain
- José C. Paz in SeptemberArgentina · 32 kmHigh 18.4°C · Low 9.1°C · 72 mm rain
- San Miguel, Argentina in SeptemberArgentina · 37 kmHigh 18.2°C · Low 9.3°C · 72 mm rain
- Merlo in SeptemberArgentina · 37 kmHigh 18.5°C · Low 9.1°C · 71 mm rain
- Bella Vista in SeptemberArgentina · 39 kmHigh 18.4°C · Low 9.2°C · 72 mm rain
- Don Torcuato in SeptemberArgentina · 45 kmHigh 18.0°C · Low 9.8°C · 72 mm rain
- Campana in SeptemberArgentina · 47 kmHigh 19.0°C · Low 9.0°C · 74 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 Luján) is explained once on the Luján year overview and on the Sources, method and limits page.
Pilar lies in the same rainfall cell, so its rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.