Climate averages 1991–2020
Tandil weather
in September.
A mild, moderately wet month: the 8th warmest and the 5th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a mild month in Tandil: daytime highs average 16.0°C and nights cool to about 5.8°C. By daytime temperature it is the 8th warmest of the 12 months.
Expect about 59 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 49 min on an average September day.
The nearest other city in this atlas is Olavarría (116 km away). In September its highs average 16.8°C, 0.9°C warmer than Tandil, with 62 mm of rain.
Among the 67 cities listed in Argentina, Tandil ranks 61st of 67 for the warmest September highs and 25th of 67 for the driest September (rainfall, lowest first). The mean September high of those 67 cities is 19.4°C; Tandil is 3.4°C cooler than that mean.
From September to October, average highs rise by 2.9°C to 18.9°C, and monthly rainfall rises from 59 mm to 85 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
Tandil climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 27.1°C15.3°C | 15.3°C | 81 | 9.1 | 14.414 h |
| February | 25.7°C14.9°C | 14.9°C | 73 | 8.0 | 13.514 h |
| March | 23.3°C13.2°C | 13.2°C | 74 | 8.0 | 12.312 h |
| April | 19.2°C10.1°C | 10.1°C | 81 | 7.6 | 11.211 h |
| May | 15.5°C7.4°C | 7.4°C | 42 | 5.6 | 10.210 h |
| June | 12.4°C4.6°C | 4.6°C | 41 | 4.8 | 9.610 h |
| July | 11.6°C3.5°C | 3.5°C | 40 | 5.3 | 9.910 h |
| August | 14.1°C4.6°C | 4.6°C | 51 | 5.5 | 10.711 h |
| September, selected | 16.0°C5.8°C | 5.8°C | 59 | 7.0 | 11.812 h |
| October | 18.9°C8.4°C | 8.4°C | 85 | 9.5 | 13.013 h |
| November | 22.4°C10.9°C | 10.9°C | 90 | 9.5 | 14.114 h |
| December | 25.9°C13.7°C | 13.7°C | 76 | 8.6 | 14.715 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
- Olavarría in SeptemberArgentina · 116 kmHigh 16.8°C · Low 6.4°C · 62 mm rain
- Necochea in SeptemberArgentina · 141 kmHigh 14.3°C · Low 7.8°C · 56 mm rain
- Mar del Plata in SeptemberArgentina · 158 kmHigh 14.7°C · Low 7.5°C · 60 mm rain
- Mar del Tuyú in SeptemberArgentina · 233 kmHigh 13.8°C · Low 9.8°C · 74 mm rain
- San Vicente in SeptemberArgentina · 264 kmHigh 18.0°C · Low 8.6°C · 72 mm rain
- Ezeiza in SeptemberArgentina · 281 kmHigh 18.1°C · Low 9.0°C · 72 mm rain
- La Plata in SeptemberArgentina · 288 kmHigh 17.0°C · Low 10.0°C · 72 mm rain
- Laferrere in SeptemberArgentina · 291 kmHigh 18.3°C · Low 9.1°C · 72 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 Tandil) is explained once on the Tandil year overview and on the Sources, method and limits page.