September weather forecastGreencastle, Ireland
September
Weather in September
September, the first month of the autumn in Greencastle, is still a mild month, with an average temperature fluctuating between 14.8°C (58.6°F) and 9.2°C (48.6°F).Temperature
As September takes its course, Greencastle's average high-temperature registers at a still refreshing 14.8°C (58.6°F), closely aligning with the preceding month. During September, Greencastle's temperature averages to a chilly 9.2°C (48.6°F) at night.Humidity
The average relative humidity in September is 87%.Rainfall
September is the month with the least rainfall. Rain falls for 16.1 days and accumulates 29mm (1.14") of precipitation.Snowfall
April through October are months without snowfall.Daylight
In Greencastle, the average length of the day in September is 12h and 43min.On the first day of the month, sunrise is at 6:35 am and sunset at 8:20 pm. On the last day of September, in Greencastle, Ireland, sunrise is at 7:29 am and sunset at 7:05 pm IST.
Sunshine
In September, the average sunshine is 5.1h.UV index
In Greencastle, the average daily maximum UV index in September is 3. A UV Index of 3 to 5 symbolizes a medium health hazard from unprotected exposure to Sun's UV rays for the average person.Note: The maximum UV index, 3 during September, leads to the following recommendations:
Be vigilant - A duty to shield skin and eyes from injury exists. For skin protection, it's recommended to minimize Sun exposure during its peak hours around midday. For effective sun eye protection, rely on sunglasses certified for UVA and UVB resistance.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Greencastle, Ireland
- Average high temperature in September: 14.8°C
The warmest month (with the highest average high temperature) is July (16.5°C).
The month with the lowest average high temperature is January (6.3°C).
- Average low temperature in September: 9.2°C
The month with the highest average low temperature is August (10.4°C).
The coldest month (with the lowest average low temperature) is February (2.3°C).
Average pressure in September
Greencastle, Ireland
- Average pressure in September: 1013.6mbar
The month with the highest atmospheric pressure is May (1015.2mbar).
The month with the lowest atmospheric pressure is November (1006.6mbar).
Average wind speed in September
Greencastle, Ireland
- Average wind speed in September: 16.9km/h
The windiest month (with the highest average wind speed) is January (21.9km/h).
The calmest month (with the lowest average wind speed) is July (13.8km/h).
Average humidity in September
Greencastle, Ireland
- Average humidity in September: 87%
The months with the highest relative humidity are January, August and December (88%).
The month with the lowest relative humidity is April (82%).
Average rainfall in September
Greencastle, Ireland
- Average rainfall in September: 29mm
The wettest month (with the highest rainfall) is August (60mm).
The driest month (with the least rainfall) is September (29mm).
Average rainfall days in September
Greencastle, Ireland
- Average rainfall days in September: 16.1 days
The month with the highest number of rainy days is August (21.5 days).
The month with the least rainy days is April (15.7 days).
Average snowfall in September
Greencastle, Ireland
- Average snowfall in September: 0mm
The months with the highest snowfall are January and February (21mm).
The months with the least snowfall are April, May, June, July, August, September and October (0mm).
Average snowfall days in September
Greencastle, Ireland
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (2.7 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Greencastle, Ireland
- Average daylight in September: 12h and 42min
The month with the longest days is June (Average daylight: 17h and 18min).
The month with the shortest days is December (Average daylight: 7h and 12min).
- Average sunshine in September: 5h and 6min
The month with the most sunshine is June (Average sunshine: 6h and 42min).
The month with the least sunshine is January (Average sunshine: 3h and 24min).
Average sunshine days in September
Greencastle, Ireland
- Average sunshine days in September: 9.9 days
The month with the most sunshine days is April (11.1 days).
The month with the least sunshine days is August (6.3 days).
Average UV index in September
Greencastle, Ireland
- Average UV index in September: 3
The months with the highest UV index are May and June (UV index 4).
The months with the lowest UV index are January, February, March, November and December (UV index 2).
Average cloud cover in September
Greencastle, Ireland
- Average cloud cover in September: 64
The month with the most cloud cover is July (Cloud cover 68).
The month with the least cloud cover is April (Cloud cover 58).
Average visibility in September
Greencastle, Ireland
- Average visibility in September: 9km
The months with the highest visibility are January, February, March, April, May, June, August, September, October, November and December (9km).
The month with the lowest visibility is July (8km).
