September weather forecastRivera, Uruguay
September
Weather in September
Spring at full swing, September in Rivera brings with it some needed warmth. Average high temperatures increase to 20.9°C (69.6°F), an affirmation of autumns arrival. Despite the temperature rise, Rivera can expect an average of 78mm (3.07") of rainfall during the month. The shift from the transitionary September to the warmer October creates a pleasant anticipation. Septembers weather is a captivating blend of spring warmth, perfectly pitching the stage for the oncoming summer.Temperature
Rivera's shift into September sets the average high-temperature at an agreeable 20.9°C (69.6°F), a figure that deviates only slightly from August's 19.1°C (66.4°F). Rivera reports an average nighttime low-temperature of 10.6°C (51.1°F) in September.Humidity
In September, the average relative humidity in Rivera, Uruguay, is 78%.Rainfall
In September, the rain falls for 11.5 days. Throughout September, 78mm (3.07") of precipitation is accumulated. In Rivera, during the entire year, the rain falls for 133.2 days and collects up to 920mm (36.22") of precipitation.Daylight
The average length of the day in September is 11h and 55min.On the first day of September, sunrise is at 06:57 and sunset at 18:26. On the last day of the month, sunrise is at 06:20 and sunset at 18:43 -03.
Sunshine
The average sunshine in September is 7.2h.UV index
In Rivera, the average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV rays for ordinary individuals.Note: The UV index of 4 in September translates into these instructions:
Prioritize safety - Recommendations to avert sunburn are shared. Being exposed to the midday Sun can have harmful effects due to strong UV radiation; always take precautions. Clothes that are both tight-knit and comfortably loose are prime choices for sun protection.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Rivera, Uruguay
- Average high temperature in September: 20.9°C
The warmest month (with the highest average high temperature) is January (30.5°C).
The month with the lowest average high temperature is July (16.5°C).
- Average low temperature in September: 10.6°C
The month with the highest average low temperature is January (18.5°C).
The coldest month (with the lowest average low temperature) is July (8°C).
Average pressure in September
Rivera, Uruguay
- Average pressure in September: 1016.3mbar
The month with the highest atmospheric pressure is July (1019mbar).
The month with the lowest atmospheric pressure is December (1010.2mbar).
Average wind speed in September
Rivera, Uruguay
- Average wind speed in September: 15.2km/h
The windiest month (with the highest average wind speed) is September (15.2km/h).
The calmest month (with the lowest average wind speed) is April (12.3km/h).
Average humidity in September
Rivera, Uruguay
- Average humidity in September: 78%
The months with the highest relative humidity are May and June (83%).
The month with the lowest relative humidity is December (66%).
Average rainfall in September
Rivera, Uruguay
- Average rainfall in September: 78mm
The wettest months (with the highest rainfall) are May and November (98mm).
The driest month (with the least rainfall) is August (57mm).
Average rainfall days in September
Rivera, Uruguay
- Average rainfall days in September: 11.5 days
The month with the highest number of rainy days is January (12.6 days).
The month with the least rainy days is August (9.3 days).
Average daylight in September /
Average sunshine in September
Rivera, Uruguay
- Average daylight in September: 11h and 54min
The month with the longest days is December (Average daylight: 14h and 6min).
The month with the shortest days is June (Average daylight: 10h and 12min).
- Average sunshine in September: 7h and 12min
The month with the most sunshine is December (Average sunshine: 10h and 12min).
The month with the least sunshine is June (Average sunshine: 5h and 18min).
Average sunshine days in September
Rivera, Uruguay
- Average sunshine days in September: 17 days
The month with the most sunshine days is August (20.3 days).
The month with the least sunshine days is February (15.1 days).
Average UV index in September
Rivera, Uruguay
- Average UV index in September: 4
The months with the highest UV index are January, February, March, November and December (UV index 6).
The month with the lowest UV index is May (UV index 3).
Average cloud cover in September
Rivera, Uruguay
- Average cloud cover in September: 40
The month with the most cloud cover is May (Cloud cover 43).
The month with the least cloud cover is December (Cloud cover 28).
Average visibility in September
Rivera, Uruguay
- Average visibility in September: 9km
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (9km).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (9km).
