Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
With September's onset, the weather shows a temperature decrease, transitioning from a hot 33.2°C (91.8°F) in August to a warm 26.9°C (80.4°F). Riesi cools down to an average low-temperature of 18.4°C (65.1°F) throughout the month of September.Humidity
The average relative humidity in September is 64%.Rainfall
In September, in Riesi, the rain falls for 8.9 days. Throughout September, 42mm (1.65") of precipitation is accumulated. In Riesi, during the entire year, the rain falls for 103.1 days and collects up to 309mm (12.17") of precipitation.Snowfall
March through December are months without snowfall in Riesi.Daylight
In Riesi, the average length of the day in September is 12h and 25min.On the first day of the month, sunrise is at 06:34 and sunset at 19:32. On the last day of September, sunrise is at 06:58 and sunset at 18:48 CEST.
Sunshine
In Riesi, the average sunshine in September is 10.7h.UV index
The average daily maximum UV index in September is 6. A UV Index of 6 to 7 symbolizes a high threat to health from unsafe exposure to UV radiation for the ordinary person.Note: The maximum daily UV index, 6 in September, converts into the following recommendations:
Deflect overexposure. Sun protection is a necessity. The Sun emits the most powerful UV radiation between 10 a.m. and 4 p.m. Try to avoid direct sunlight during this period. Arm yourself against UV rays' harm with protective apparel and UV-filtering shades.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the temperature in September in Riesi?
What is the average humidity in September in Riesi?
How many days does it rain in September in Riesi?
When it does not snow in Riesi?
What is the average length of the day in September in Riesi?
What time are sunrise and sunset in September in Riesi?
How long on average sun shines in September in Riesi?
How high is the UV index in September in Riesi?
Average temperature in September
Riesi, Italy
- Average high temperature in September: 26.9°C
The warmest months (with the highest average high temperature) are July and August (33.2°C).
The month with the lowest average high temperature is January (11.8°C).
- Average low temperature in September: 18.4°C
The month with the highest average low temperature is August (21.1°C).
The coldest month (with the lowest average low temperature) is February (3.6°C).
Average pressure in September
Riesi, Italy
- Average pressure in September: 1015.7mbar
The month with the highest atmospheric pressure is December (1019.2mbar).
The month with the lowest atmospheric pressure is July (1014.2mbar).
Average wind speed in September
Riesi, Italy
- Average wind speed in September: 7.8km/h
The windiest month (with the highest average wind speed) is February (11.6km/h).
The calmest month (with the lowest average wind speed) is August (7.5km/h).
Average humidity in September
Riesi, Italy
- Average humidity in September: 64%
The month with the highest relative humidity is January (83%).
The month with the lowest relative humidity is July (46%).
Average rainfall in September
Riesi, Italy
- Average rainfall in September: 42mm
The wettest month (with the highest rainfall) is October (47mm).
The driest month (with the least rainfall) is July (5mm).
Average rainfall days in September
Riesi, Italy
- Average rainfall days in September: 8.9 days
The month with the highest number of rainy days is November (11.9 days).
The month with the least rainy days is July (3.8 days).
Average snowfall in September
Riesi, Italy
- Average snowfall in September: 0mm
The months with the highest snowfall are January and February (1mm).
The months with the least snowfall are March, April, May, June, July, August, September, October, November and December (0mm).
Average snowfall days in September
Riesi, Italy
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (0.3 days).
The months with the least snowfall days are March, April, May, June, July, August, September, October and November (0 days).
Average daylight in September /
Average sunshine in September
Riesi, Italy
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 36min).
- Average sunshine in September: 10h and 4min
The month with the most sunshine is July (Average sunshine: 12h and 6min).
The month with the least sunshine is January (Average sunshine: 5h and 36min).
Average sunshine days in September
Riesi, Italy
- Average sunshine days in September: 18.9 days
The month with the most sunshine days is July (26.7 days).
The month with the least sunshine days is February (15.4 days).
Average UV index in September
Riesi, Italy
- Average UV index in September: 6
The months with the highest UV index are June, July and August (UV index 7).
The months with the lowest UV index are January, February and December (UV index 3).
Average cloud cover in September
Riesi, Italy
- Average cloud cover in September: 21
The month with the most cloud cover is January (Cloud cover 40).
The month with the least cloud cover is July (Cloud cover 8).
Average visibility in September
Riesi, Italy
- Average visibility in September: 10km
The months with the highest visibility are May, June, July, August and September (10km).
The months with the lowest visibility are January, February, March, April, October, November and December (9km).
Riesi, Italy
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