Climate averages 1991–2020
Gualeguaychú weather
in September.
A mild, moderately wet month: the 8th warmest and the joint 4th 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 Gualeguaychú: daytime highs average 19.7°C and nights cool to about 10.1°C. By daytime temperature it is the 8th warmest of the 12 months.
Expect about 87 mm of rain on roughly 7 days, which makes September a moderately wet month (the joint 4th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 11 h 52 min on an average September day.
The nearest other city in this atlas is Paysandú (87 km away). In September its highs average 20.0°C, about as warm as Gualeguaychú, with 96 mm of rain.
Among the 67 cities listed in Argentina, Gualeguaychú ranks joint 28th of 67 for the warmest September highs and 59th of 67 for the driest September (rainfall, lowest first). The mean September high of those 67 cities is 19.4°C; Gualeguaychú is 0.3°C warmer than that mean.
From September to October, average highs rise by 2.9°C to 22.5°C, and monthly rainfall rises from 87 mm to 124 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
Gualeguaychú climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 29.9°C20.1°C | 20.1°C | 110 | 7.7 | 14.114 h |
| February | 28.3°C19.3°C | 19.3°C | 117 | 8.1 | 13.313 h |
| March | 26.4°C17.5°C | 17.5°C | 121 | 8.0 | 12.312 h |
| April | 22.7°C14.2°C | 14.2°C | 130 | 7.9 | 11.311 h |
| May | 18.9°C11.1°C | 11.1°C | 80 | 6.1 | 10.410 h |
| June | 16.2°C8.3°C | 8.3°C | 69 | 6.5 | 10.010 h |
| July | 15.4°C7.2°C | 7.2°C | 64 | 6.0 | 10.210 h |
| August | 17.9°C8.5°C | 8.5°C | 87 | 6.5 | 10.911 h |
| September, selected | 19.7°C10.1°C | 10.1°C | 87 | 7.0 | 11.912 h |
| October | 22.5°C13.1°C | 13.1°C | 124 | 9.8 | 12.913 h |
| November | 25.8°C15.6°C | 15.6°C | 104 | 6.9 | 13.814 h |
| December | 28.6°C18.3°C | 18.3°C | 128 | 8.6 | 14.314 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
- Paysandú in SeptemberUruguay · 87 kmHigh 20.0°C · Low 10.1°C · 96 mm rain
- Zárate in SeptemberArgentina · 130 kmHigh 19.0°C · Low 9.2°C · 75 mm rain
- Campana in SeptemberArgentina · 135 kmHigh 19.0°C · Low 9.0°C · 74 mm rain
- San Nicolás de los Arroyos in SeptemberArgentina · 162 kmHigh 20.0°C · Low 10.4°C · 67 mm rain
- Pilar in SeptemberArgentina · 165 kmHigh 18.6°C · Low 8.9°C · 71 mm rain
- Don Torcuato in SeptemberArgentina · 166 kmHigh 18.0°C · Low 9.8°C · 72 mm rain
- José C. Paz in SeptemberArgentina · 169 kmHigh 18.4°C · Low 9.1°C · 72 mm rain
- San Miguel, Argentina in SeptemberArgentina · 172 kmHigh 18.2°C · Low 9.3°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 Gualeguaychú) is explained once on the Gualeguaychú year overview and on the Sources, method and limits page.