September weather forecastRiobamba, Ecuador
September
Weather in September
The weather in September in Riobamba, Ecuador witnesses a small uptick in rainfall from the drier August. Despite this increase, the amount of snowfall remains steady at 18mm (0.71"), confirming September as the month with the year's least snowfall. The wind speed gradually declines from August, adding tranquillity to the early autumn weather. The departure of September carries with it increased cloud cover and a potential rise in precipitation.Temperature
Riobamba, Ecuador, greets September with an average high-temperature of a mild 13.3°C (55.9°F), marking a slight deviation from the preceding month. An average low-temperature of 4.5°C (40.1°F) marks the month of September in Riobamba.Humidity
With an average relative humidity of 81%, September is the least humid month in Riobamba.Rainfall
In Riobamba, Ecuador, during September, the rain falls for 23.6 days and regularly aggregates up to 64mm (2.52") of precipitation. Throughout the year, there are 327.5 rainfall days, and 1706mm (67.17") of precipitation is accumulated.Snowfall
January through December are months with snowfall. September is the month with the least snowfall in Riobamba, Ecuador. Snow falls for 2.4 days and accumulates 18mm (0.71") of snow.Daylight
In Riobamba, the average length of the day in September is 12h and 6min.On the first day of the month, sunrise is at 06:11 and sunset at 18:16. On the last day of September, sunrise is at 06:00 and sunset at 18:08 -05.
Sunshine
In September, the average sunshine in Riobamba, Ecuador, is 8.8h.UV index
January, March, May, June, August through October, with an average maximum UV index of 3, are months with the highest UV index. A UV Index value of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV rays for the average person.Note: In September, a regular UV index of 3 translates into these guidelines:
Prioritize safety - Recommendations to avert sunburn are shared. Avoiding the Sun's peak radiation during midday hours is essential for health and safety. Sunglasses that ward off UVA and UVB rays play a pivotal role in reducing solar eye damage. Be attentive! The reflective property of snow can nearly double the Sun's UV radiation.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Riobamba, Ecuador
- Average high temperature in September: 13.3°C
The warmest months (with the highest average high temperature) are October and November (13.6°C).
The month with the lowest average high temperature is July (11.8°C).
- Average low temperature in September: 4.5°C
The months with the highest average low temperature are February and March (6.4°C).
The coldest month (with the lowest average low temperature) is August (3.8°C).
Average pressure in September
Riobamba, Ecuador
- Average pressure in September: 1014.9mbar
The month with the highest atmospheric pressure is July (1015.7mbar).
The month with the lowest atmospheric pressure is November (1012.8mbar).
Average wind speed in September
Riobamba, Ecuador
- Average wind speed in September: 8.3km/h
The windiest months (with the highest average wind speed) are July and August (8.9km/h).
The calmest month (with the lowest average wind speed) is November (5.1km/h).
Average humidity in September
Riobamba, Ecuador
- Average humidity in September: 81%
The month with the highest relative humidity is April (88%).
The month with the lowest relative humidity is September (81%).
Average rainfall in September
Riobamba, Ecuador
- Average rainfall in September: 64mm
The wettest month (with the highest rainfall) is March (223mm).
The driest month (with the least rainfall) is August (46mm).
Average rainfall days in September
Riobamba, Ecuador
- Average rainfall days in September: 23.6 days
The month with the highest number of rainy days is March (30.8 days).
The month with the least rainy days is August (20.9 days).
Average snowfall in September
Riobamba, Ecuador
- Average snowfall in September: 18mm
The month with the highest snowfall is January (106mm).
The month with the least snowfall is September (18mm).
Average snowfall days in September
Riobamba, Ecuador
- Average snowfall days in September: 2.4 days
The month with the highest number of snowfall days is December (4.5 days).
The months with the least snowfall days are February, March and August (2.3 days).
Average daylight in September /
Average sunshine in September
Riobamba, Ecuador
- Average daylight in September: 12h and 6min
The month with the longest days is December (Average daylight: 12h and 12min).
The month with the shortest days is June (Average daylight: 12h and 0min).
- Average sunshine in September: 8h and 48min
The month with the most sunshine is October (Average sunshine: 9h and 30min).
The month with the least sunshine is April (Average sunshine: 6h and 36min).
Average sunshine days in September
Riobamba, Ecuador
- Average sunshine days in September: 3.5 days
The months with the most sunshine days are July and August (4.8 days).
The month with the least sunshine days is April (0 days).
Average UV index in September
Riobamba, Ecuador
- Average UV index in September: 3
The months with the highest UV index are January, March, May, June, August, September and October (UV index 3).
The months with the lowest UV index are February, April, July, November and December (UV index 2).
Average cloud cover in September
Riobamba, Ecuador
- Average cloud cover in September: 36
The month with the most cloud cover is April (Cloud cover 57).
The month with the least cloud cover is September (Cloud cover 36).
Average visibility in September
Riobamba, Ecuador
- Average visibility in September: 9km
The months with the highest visibility are August and September (9km).
The months with the lowest visibility are April, May and December (7km).
