Climate averages 1991–2020
Montevideo weather
in September.
A mild, wet month: the 9th warmest and the joint 5th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a mild month in Montevideo: daytime highs average 15.6°C and nights cool to about 10.6°C. By daytime temperature it is the 9th warmest of the 12 months.
Expect about 92 mm of rain on roughly 8 days, which makes September a wet month (the joint 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 Maldonado (113 km away). In September its highs average 15.1°C, about as warm as Montevideo, with 89 mm of rain.
Among the 4 cities listed in Uruguay, Montevideo ranks 3rd of 4 for the warmest September highs and 2nd of 4 for the driest September (rainfall, lowest first). The mean September high of those 4 cities is 17.7°C; Montevideo is 2.1°C cooler than that mean.
From September to October, average highs rise by 2.6°C to 18.2°C, and monthly rainfall rises from 92 mm to 111 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
Montevideo climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 25.2°C19.6°C | 19.6°C | 68 | 5.9 | 14.214 h |
| February | 24.7°C19.6°C | 19.6°C | 92 | 7.8 | 13.413 h |
| March | 23.2°C18.3°C | 18.3°C | 97 | 7.9 | 12.312 h |
| April | 20.1°C15.5°C | 15.5°C | 107 | 8.3 | 11.211 h |
| May | 16.7°C12.6°C | 12.6°C | 87 | 7.9 | 10.310 h |
| June | 14.0°C9.8°C | 9.8°C | 90 | 8.6 | 9.910 h |
| July | 12.8°C8.5°C | 8.5°C | 96 | 8.9 | 10.010 h |
| August | 14.5°C9.5°C | 9.5°C | 97 | 8.5 | 10.811 h |
| September, selected | 15.6°C10.6°C | 10.6°C | 92 | 8.3 | 11.812 h |
| October | 18.2°C13.1°C | 13.1°C | 111 | 8.7 | 12.913 h |
| November | 21.1°C15.4°C | 15.4°C | 101 | 7.7 | 13.914 h |
| December | 23.7°C17.9°C | 17.9°C | 73 | 6.9 | 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
- Maldonado in SeptemberUruguay · 113 kmHigh 15.1°C · Low 10.1°C · 89 mm rain
- Berisso in SeptemberArgentina · 155 kmHigh 17.0°C · Low 10.3°C · 81 mm rain
- La Plata in SeptemberArgentina · 161 kmHigh 17.0°C · Low 10.0°C · 72 mm rain
- Berazategui in SeptemberArgentina · 185 kmHigh 17.1°C · Low 10.3°C · 74 mm rain
- Quilmes in SeptemberArgentina · 190 kmHigh 17.4°C · Low 9.9°C · 74 mm rain
- Mar del Tuyú in SeptemberArgentina · 191 kmHigh 13.8°C · Low 9.8°C · 74 mm rain
- Avellaneda in SeptemberArgentina · 201 kmHigh 17.5°C · Low 10.1°C · 74 mm rain
- Buenos Aires in SeptemberArgentina · 203 kmHigh 17.3°C · Low 10.4°C · 80 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 Montevideo) is explained once on the Montevideo year overview and on the Sources, method and limits page.