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
September
Weather in September
Temperature
Onset of September comes with a temperature decline, the average high falling from a torrid 38°C (100.4°F) in August to a hot 32.8°C (91°F). Despite considerable daily temperature swings, a steady low-temperature average of 20.3°C (68.5°F) is noted throughout September.Humidity
In September, the average relative humidity is 35%.Rainfall
Months with rainfall are January through June, September through December. September is the first month it rains. Throughout September, in the average 2.1 rainfall days, it receives 5mm (0.2") of precipitation. In Billi, Syria, during the entire year, the rain falls for 86.3 days and collects up to 298mm (11.73") of precipitation.Snowfall
March through November are months without snowfall.Daylight
In September, the average length of the day is 12h and 25min.On the first day of September, sunrise is at 05:58 and sunset at 18:55. On the last day of the month, sunrise is at 06:22 and sunset at 18:12 +03.
Sunshine
In September, the average sunshine is 10h.UV index
In September, the average daily maximum UV index is 6. A UV Index value of 6 to 7 symbolizes a high health risk from unprotected exposure to Sun's UV rays for the ordinary person.Note: The UV index of 6 during September translates into the following guidance:
Adhere to precautions and respect sun safety doctrines. Avoiding sunburn is vital. Limit your exposure to the sun's UV radiation, which is strongest between 10 a.m. and 4 p.m., and note that parasols or canopies may not provide full sun protection. Employ a hat with a wide brim for robust protection, cutting UV exposure by half.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How hot does it get in September?
What is the average humidity in September?
When does it start to rain?
When it does not snow?
What is the average length of the day in September?
What time are sunrise and sunset in September?
How long on average sun shines in September in Billi?
What is the UV index intensity in September?
Average temperature in September
Billi, Syria
- Average high temperature in September: 32.8°C
The warmest month (with the highest average high temperature) is July (38.1°C).
The month with the lowest average high temperature is January (8.9°C).
- Average low temperature in September: 20.3°C
The month with the highest average low temperature is July (23.8°C).
The coldest month (with the lowest average low temperature) is January (2.4°C).
Average pressure in September
Billi, Syria
- Average pressure in September: 1009.5mbar
The month with the highest atmospheric pressure is December (1020.1mbar).
The month with the lowest atmospheric pressure is July (1003.6mbar).
Average wind speed in September
Billi, Syria
- Average wind speed in September: 10.3km/h
The windiest month (with the highest average wind speed) is July (14.4km/h).
The calmest month (with the lowest average wind speed) is November (8km/h).
Average humidity in September
Billi, Syria
- Average humidity in September: 35%
The month with the highest relative humidity is January (71%).
The months with the lowest relative humidity are July and August (32%).
Average rainfall in September
Billi, Syria
- Average rainfall in September: 5mm
The wettest month (with the highest rainfall) is December (65mm).
The driest months (with the least rainfall) are July and August (0mm).
Average rainfall days in September
Billi, Syria
- Average rainfall days in September: 2.1 days
The month with the highest number of rainy days is March (12.8 days).
The months with the least rainy days are July and August (0.3 days).
Average snowfall in September
Billi, Syria
- Average snowfall in September: 0mm
The month with the highest snowfall is February (26mm).
The months with the least snowfall are March, April, May, June, July, August, September, October and November (0mm).
Average snowfall days in September
Billi, Syria
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (1.3 days).
The months with the least snowfall days are April, May, June, July, August, September, October and November (0 days).
Average daylight in September /
Average sunshine in September
Billi, Syria
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 36min).
The month with the shortest days is December (Average daylight: 9h and 42min).
- Average sunshine in September: 10h and 0min
The month with the most sunshine is August (Average sunshine: 12h and 30min).
The month with the least sunshine is January (Average sunshine: 5h and 18min).
Average sunshine days in September
Billi, Syria
- Average sunshine days in September: 27.2 days
The months with the most sunshine days are July and August (30.5 days).
The month with the least sunshine days is February (15.5 days).
Average UV index in September
Billi, Syria
- Average UV index in September: 6
The months with the highest UV index are July and August (UV index 8).
The months with the lowest UV index are January and December (UV index 2).
Average cloud cover in September
Billi, Syria
- Average cloud cover in September: 5
The month with the most cloud cover is January (Cloud cover 44).
The months with the least cloud cover are July and August (Cloud cover 2).
Average visibility in September
Billi, Syria
- Average visibility in September: 10km
The months with the highest visibility are April, May, June, July, August, September, October and November (10km).
The months with the lowest visibility are January, February, March and December (9km).
