Climate averages 1991–2020
Rivera weather
in September.
A mild, wet month: the 8th warmest and the 9th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a mild month in Rivera: daytime highs average 20.0°C and nights cool to about 10.7°C. By daytime temperature it is the 8th warmest of the 12 months.
Expect about 131 mm of rain on roughly 9 days, which makes September a wet month (the 9th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 11 h 53 min on an average September day.
The nearest other city in this atlas is Sant'Ana do Livramento (2 km away). In September its highs average 19.8°C, about as warm as Rivera, with 131 mm of rain.
Among the 4 cities listed in Uruguay, Rivera ranks joint 1st of 4 for the warmest September highs and 4th of 4 for the driest September (rainfall, lowest first). The mean September high of those 4 cities is 17.7°C; Rivera is 2.4°C warmer than that mean.
From September to October, average highs rise by 2.6°C to 22.6°C, and monthly rainfall rises from 131 mm to 161 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
Rivera climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 29.1°C19.4°C | 19.4°C | 133 | 10.7 | 13.914 h |
| February | 28.1°C19.1°C | 19.1°C | 129 | 10.5 | 13.213 h |
| March | 26.6°C17.5°C | 17.5°C | 107 | 9.4 | 12.312 h |
| April | 23.2°C14.7°C | 14.7°C | 143 | 9.0 | 11.411 h |
| May | 19.3°C11.5°C | 11.5°C | 110 | 8.3 | 10.611 h |
| June | 17.1°C9.3°C | 9.3°C | 124 | 8.7 | 10.210 h |
| July | 16.5°C8.3°C | 8.3°C | 108 | 8.1 | 10.310 h |
| August | 18.8°C9.4°C | 9.4°C | 105 | 8.2 | 11.011 h |
| September, selected | 20.0°C10.7°C | 10.7°C | 131 | 9.4 | 11.912 h |
| October | 22.6°C13.3°C | 13.3°C | 161 | 10.9 | 12.813 h |
| November | 25.4°C15.1°C | 15.1°C | 117 | 8.3 | 13.714 h |
| December | 28.2°C17.9°C | 17.9°C | 117 | 9.8 | 14.114 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
- Sant'Ana do Livramento in SeptemberBrazil · 2 kmHigh 19.8°C · Low 10.3°C · 131 mm rain
- Alegrete in SeptemberBrazil · 127 kmHigh 21.7°C · Low 12.1°C · 155 mm rain
- Bagé in SeptemberBrazil · 145 kmHigh 19.6°C · Low 10.4°C · 139 mm rain
- Uruguaiana in SeptemberBrazil · 195 kmHigh 22.0°C · Low 12.6°C · 126 mm rain
- Santa Maria in SeptemberBrazil · 216 kmHigh 21.2°C · Low 11.4°C · 157 mm rain
- Concordia in SeptemberArgentina · 241 kmHigh 20.8°C · Low 11.3°C · 91 mm rain
- Cachoeira do Sul in SeptemberBrazil · 272 kmHigh 21.3°C · Low 12.0°C · 153 mm rain
- Paysandú in SeptemberUruguay · 286 kmHigh 20.0°C · Low 10.1°C · 96 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 Rivera) is explained once on the Rivera year overview and on the Sources, method and limits page.
Sant'Ana do Livramento lies in the same rainfall cell, so its rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.