September weather forecastDerrymullan, Ireland
September
Weather in September
September, the first month of the autumn in Derrymullan, is still a mild month, with temperature in the range of an average high of 15.5°C (59.9°F) and an average low of 8.8°C (47.8°F).Temperature
As September unfolds, the average high-temperature reaches a mild 15.5°C (59.9°F), hinting at a slight fluctuation from the previous month. During the nights in September, Derrymullan experiences a consistent average temperature of 8.8°C (47.8°F).Humidity
In Derrymullan, the average relative humidity in September is 89%.Rainfall
The month with the least rainfall is September, when the rain falls for 13.7 days and typically collects 21mm (0.83") of precipitation.Snowfall
In Derrymullan, snow does not fall in May through October.Daylight
The average length of the day in September is 12h and 41min.On the first day of the month, sunrise is at 6:43 am and sunset at 8:22 pm. On the last day of September, sunrise is at 7:33 am and sunset at 7:11 pm IST.
Sunshine
In September, the average sunshine in Derrymullan, Ireland, is 5.2h.UV index
The average daily maximum UV index in September is 3. A UV Index reading of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV rays for ordinary individuals.Note: A maximum high daily UV index of 3 during September translates into the following directions:
Exercise prevention - Warding off sunburn is urged. Direct exposure to the Sun's intense radiation around midday should be avoided for health reasons. A wide-brimmed hat is a staple for defending the face, eyes, ears, and neck from the Sun.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Derrymullan, Ireland
- Average high temperature in September: 15.5°C
The warmest month (with the highest average high temperature) is July (17.4°C).
The month with the lowest average high temperature is January (7°C).
- Average low temperature in September: 8.8°C
The month with the highest average low temperature is July (10.5°C).
The coldest month (with the lowest average low temperature) is February (2.1°C).
Average pressure in September
Derrymullan, Ireland
- Average pressure in September: 1014.7mbar
The month with the highest atmospheric pressure is May (1015.6mbar).
The month with the lowest atmospheric pressure is November (1007.6mbar).
Average wind speed in September
Derrymullan, Ireland
- Average wind speed in September: 14.5km/h
The windiest month (with the highest average wind speed) is January (19.3km/h).
The calmest month (with the lowest average wind speed) is July (13.1km/h).
Average humidity in September
Derrymullan, Ireland
- Average humidity in September: 89%
The months with the highest relative humidity are November and December (91%).
The month with the lowest relative humidity is April (85%).
Average rainfall in September
Derrymullan, Ireland
- Average rainfall in September: 21mm
The wettest month (with the highest rainfall) is August (45mm).
The driest month (with the least rainfall) is September (21mm).
Average rainfall days in September
Derrymullan, Ireland
- Average rainfall days in September: 13.7 days
The month with the highest number of rainy days is July (19.6 days).
The month with the least rainy days is February (13.1 days).
Average snowfall in September
Derrymullan, Ireland
- Average snowfall in September: 0mm
The months with the highest snowfall are January and February (12mm).
The months with the least snowfall are May, June, July, August, September and October (0mm).
Average snowfall days in September
Derrymullan, Ireland
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (2.3 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
Derrymullan, Ireland
- Average daylight in September: 12h and 42min
The month with the longest days is June (Average daylight: 16h and 54min).
The month with the shortest days is December (Average daylight: 7h and 36min).
- Average sunshine in September: 5h and 12min
The month with the most sunshine is June (Average sunshine: 6h and 42min).
The months with the least sunshine are January, February, October and December (Average sunshine: 3h and 48min).
Average sunshine days in September
Derrymullan, Ireland
- Average sunshine days in September: 10.9 days
The month with the most sunshine days is April (12.3 days).
The month with the least sunshine days is August (6.3 days).
Average UV index in September
Derrymullan, 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, November and December (UV index 2).
Average cloud cover in September
Derrymullan, Ireland
- Average cloud cover in September: 65
The months with the most cloud cover are July and August (Cloud cover 70).
The month with the least cloud cover is April (Cloud cover 60).
Average visibility in September
Derrymullan, Ireland
- Average visibility in September: 8km
The months with the highest visibility are January, February, March and December (9km).
The month with the lowest visibility is July (7km).
