Climate averages 1991–2020
Santa Rosa, Argentina 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 Santa Rosa, Argentina: daytime highs average 18.9°C and nights cool to about 8.0°C. By daytime temperature it is the 8th warmest of the 12 months.
Expect about 48 mm of rain on roughly 6 days, which makes September a moderately wet month (the 5th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 11 h 50 min on an average September day.
The nearest other city in this atlas is Bahía Blanca (294 km away). In September its highs average 17.6°C, 1.3°C cooler than Santa Rosa, Argentina, with 45 mm of rain.
Among the 67 cities listed in Argentina, Santa Rosa, Argentina ranks 34th of 67 for the warmest September highs and 21st of 67 for the driest September (rainfall, lowest first). The mean September high of those 67 cities is 19.4°C; Santa Rosa, Argentina is 0.5°C cooler than that mean.
From September to October, average highs rise by 3.0°C to 21.9°C, and monthly rainfall rises from 48 mm to 82 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
Santa Rosa, Argentina climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 30.1°C19.0°C | 19.0°C | 82 | 9.0 | 14.314 h |
| February | 28.3°C17.7°C | 17.7°C | 81 | 7.9 | 13.513 h |
| March | 25.6°C15.8°C | 15.8°C | 86 | 8.0 | 12.312 h |
| April | 21.0°C11.8°C | 11.8°C | 67 | 6.3 | 11.211 h |
| May | 17.0°C8.6°C | 8.6°C | 30 | 5.0 | 10.210 h |
| June | 13.9°C5.1°C | 5.1°C | 16 | 3.3 | 9.710 h |
| July | 13.3°C4.1°C | 4.1°C | 19 | 3.7 | 9.910 h |
| August | 16.2°C5.7°C | 5.7°C | 27 | 4.0 | 10.711 h |
| September, selected | 18.9°C8.0°C | 8.0°C | 48 | 5.8 | 11.812 h |
| October | 21.9°C11.2°C | 11.2°C | 82 | 9.6 | 13.013 h |
| November | 25.7°C14.5°C | 14.5°C | 74 | 8.0 | 14.014 h |
| December | 28.9°C17.5°C | 17.5°C | 85 | 8.5 | 14.615 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
- Bahía Blanca in SeptemberArgentina · 294 kmHigh 17.6°C · Low 8.0°C · 45 mm rain
- Villa Mercedes, Argentina in SeptemberArgentina · 344 kmHigh 20.9°C · Low 8.9°C · 36 mm rain
- Olavarría in SeptemberArgentina · 355 kmHigh 16.8°C · Low 6.4°C · 62 mm rain
- Junín in SeptemberArgentina · 377 kmHigh 19.2°C · Low 8.9°C · 67 mm rain
- Venado Tuerto in SeptemberArgentina · 383 kmHigh 20.2°C · Low 9.5°C · 58 mm rain
- Río Cuarto in SeptemberArgentina · 388 kmHigh 20.3°C · Low 9.3°C · 39 mm rain
- General Roca in SeptemberArgentina · 395 kmHigh 18.7°C · Low 7.0°C · 21 mm rain
- San Luis in SeptemberArgentina · 414 kmHigh 21.3°C · Low 9.4°C · 30 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 Santa Rosa) is explained once on the Santa Rosa, Argentina year overview and on the Sources, method and limits page.