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
September registers an average high-temperature of a mild 14.9°C (58.8°F), slightly varied from August's 16.5°C (61.7°F). Throughout the month of September, Lisnalee sees a steady low-temperature average of 8.3°C (46.9°F).Humidity
The average relative humidity in September is 90%.Rainfall
In Lisnalee, in September, during 13.3 rainfall days, 22mm (0.87") of precipitation is typically accumulated. In Lisnalee, during the entire year, the rain falls for 191.5 days and collects up to 381mm (15") of precipitation.Snowfall
April through November are months without snowfall.Daylight
In September, the average length of the day is 12h and 41min.On the first day of September, sunrise is at 6:38 am and sunset at 8:19 pm. On the last day of the month, sunrise is at 7:30 am and sunset at 7:07 pm IST.
Sunshine
The average sunshine in September is 4.9h.UV index
In Lisnalee, the average daily maximum UV index in September is 3. A UV Index estimate of 3 to 5 represents a moderate health risk from exposure to the Sun's UV radiation for ordinary individuals.Note: An average UV index of 3 in September transforms into this advice:
Undertake protective steps - Recommendations to avoid sunburn are issued. The midday Sun can be dangerous due to its intense radiation; always find shade and reduce exposure. For minimizing sun-related eye damage, always choose sunglasses with UVA and UVB coverage.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the temperature in September?
What is the average humidity in September?
How much does it rain in September?
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?
How high is the UV index in September?
Average temperature in September
Lisnalee, Ireland
- Average high temperature in September: 14.9°C
The warmest month (with the highest average high temperature) is July (17.2°C).
The month with the lowest average high temperature is January (5.9°C).
- Average low temperature in September: 8.3°C
The month with the highest average low temperature is July (9.9°C).
The coldest month (with the lowest average low temperature) is February (1.3°C).
Average pressure in September
Lisnalee, Ireland
- Average pressure in September: 1014.4mbar
The month with the highest atmospheric pressure is May (1015.5mbar).
The month with the lowest atmospheric pressure is November (1007.3mbar).
Average wind speed in September
Lisnalee, Ireland
- Average wind speed in September: 13.3km/h
The windiest month (with the highest average wind speed) is January (17.8km/h).
The calmest month (with the lowest average wind speed) is July (11.9km/h).
Average humidity in September
Lisnalee, Ireland
- Average humidity in September: 90%
The months with the highest relative humidity are January, November and December (92%).
The month with the lowest relative humidity is April (86%).
Average rainfall in September
Lisnalee, Ireland
- Average rainfall in September: 22mm
The wettest month (with the highest rainfall) is August (48mm).
The driest month (with the least rainfall) is April (21mm).
Average rainfall days in September
Lisnalee, Ireland
- Average rainfall days in September: 13.3 days
The month with the highest number of rainy days is August (20.3 days).
The month with the least rainy days is September (13.3 days).
Average snowfall in September
Lisnalee, Ireland
- Average snowfall in September: 0mm
The month with the highest snowfall is February (19mm).
The months with the least snowfall are April, May, June, July, August, September, October and November (0mm).
Average snowfall days in September
Lisnalee, Ireland
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (3.1 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Lisnalee, Ireland
- Average daylight in September: 12h and 4min
The month with the longest days is June (Average daylight: 17h and 6min).
The month with the shortest days is December (Average daylight: 7h and 30min).
- Average sunshine in September: 4h and 5min
The month with the most sunshine is June (Average sunshine: 6h and 18min).
The months with the least sunshine are January, February and October (Average sunshine: 3h and 30min).
Average sunshine days in September
Lisnalee, Ireland
- Average sunshine days in September: 9.5 days
The month with the most sunshine days is December (12 days).
The month with the least sunshine days is August (5.4 days).
Average UV index in September
Lisnalee, Ireland
- Average UV index in September: 3
The month with the highest UV index is June (UV index 4).
The months with the lowest UV index are January, February, March, October, November and December (UV index 2).
Average cloud cover in September
Lisnalee, Ireland
- Average cloud cover in September: 68
The month with the most cloud cover is August (Cloud cover 73).
The month with the least cloud cover is April (Cloud cover 61).
Average visibility in September
Lisnalee, Ireland
- Average visibility in September: 7km
The month with the highest visibility is March (9km).
The months with the lowest visibility are July, August and September (7km).
