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 sea temperature 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
The average high-temperature is a still refreshing 15.2°C (59.4°F) in September, hardly different from the 16.9°C (62.4°F) recorded in August. A modest dip in temperatures to an average of 11.3°C (52.3°F) is observed throughout Dún Laoghaire's September nights.Humidity
In Dún Laoghaire, the average relative humidity in September is 85%.Rainfall
In Dún Laoghaire, Ireland, in September, during 14.9 rainfall days, 36mm (1.42") of precipitation is typically accumulated. Throughout the year, there are 200.5 rainfall days, and 530mm (20.87") of precipitation is accumulated.Snowfall
April through October are months without snowfall in Dún Laoghaire.Sea temperature
In Dún Laoghaire, in September, the average water temperature is 14.8°C (58.6°F).Note: It is advised against swimming in 14.8°C (58.6°F) when it drops below 10°C (50°F). Such temperatures can cause extreme cold shock, leading to hyperventilation.
Daylight
In Dún Laoghaire, the average length of the day in September is 12h and 41min.On the first day of September, sunrise is at 6:35 am and sunset at 8:13 pm. On the last day of the month, sunrise is at 7:25 am and sunset at 7:03 pm IST.
Sunshine
In September, the average sunshine is 7.3h.UV index
The months with the highest UV index are May through September, with an average maximum UV index of 4. A UV Index reading of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV radiation for ordinary individuals.Note: The average daily UV index of 4 in September transforms into the following instructions:
Prioritize safety - Suggestions to prevent sun damage are offered. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Clothes that are both tight-knit and comfortably loose are prime choices for sun protection.
Frequently asked questions
What are the temperatures in Dún Laoghaire in September?
What is the average humidity in September in Dún Laoghaire?
How much does it rain in Dún Laoghaire in September?
When it does not snow in Dún Laoghaire?
What is the sea water temperature in September in Dún Laoghaire?
What is the average length of the day in September in Dún Laoghaire?
When are sunrise and sunset in September in Dún Laoghaire?
How long on average sun shines in September in Dún Laoghaire?
What are the months with the highest UV index in Dún Laoghaire?
How high is the UV index in September in Dún Laoghaire?
Average temperature in September
Dún Laoghaire, Ireland
- Average high temperature in September: 15.2°C
The warmest months (with the highest average high temperature) are July and August (16.9°C).
The months with the lowest average high temperature are January and February (7.8°C).
- Average low temperature in September: 11.3°C
The month with the highest average low temperature is August (12.7°C).
The coldest month (with the lowest average low temperature) is February (4.4°C).
Average pressure in September
Dún Laoghaire, Ireland
- Average pressure in September: 1015.4mbar
The month with the highest atmospheric pressure is May (1016mbar).
The month with the lowest atmospheric pressure is November (1008.3mbar).
Average wind speed in September
Dún Laoghaire, Ireland
- Average wind speed in September: 19.1km/h
The windiest month (with the highest average wind speed) is December (25.9km/h).
The calmest month (with the lowest average wind speed) is July (15.9km/h).
Average humidity in September
Dún Laoghaire, Ireland
- Average humidity in September: 85%
The month with the highest relative humidity is July (86%).
The month with the lowest relative humidity is March (82%).
Average rainfall in September
Dún Laoghaire, Ireland
- Average rainfall in September: 36mm
The wettest month (with the highest rainfall) is November (71mm).
The driest month (with the least rainfall) is May (27mm).
Average rainfall days in September
Dún Laoghaire, Ireland
- Average rainfall days in September: 14.9 days
The month with the highest number of rainy days is July (20.4 days).
The months with the least rainy days are March and September (14.9 days).
Average snowfall in September
Dún Laoghaire, Ireland
- Average snowfall in September: 0mm
The month with the highest snowfall is December (9mm).
The months with the least snowfall are April, May, June, July, August, September and October (0mm).
Average snowfall days in September
Dún Laoghaire, Ireland
- Average snowfall days in September: 0 days
The months with the highest number of snowfall days are January and February (1.3 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).
Average sea temperature in September
Dún Laoghaire, Ireland
- Average sea temperature in September: 14.8°C
The best month for swimming (with the highest average sea temperature) is August (14.9°C).
The coldest month (with the lowest average sea temperature) is March (8.4°C).
Average daylight in September /
Average sunshine in September
Dún Laoghaire, Ireland
- Average daylight in September: 12h and 4min
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: 7h and 2min
The month with the most sunshine is May (Average sunshine: 8h and 0min).
The month with the least sunshine is November (Average sunshine: 4h and 18min).
Average sunshine days in September
Dún Laoghaire, Ireland
- Average sunshine days in September: 11 days
The month with the most sunshine days is April (11.7 days).
The month with the least sunshine days is July (7.2 days).
Average UV index in September
Dún Laoghaire, Ireland
- Average UV index in September: 4
The months with the highest UV index are May, June, July, August and September (UV index 4).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in September
Dún Laoghaire, Ireland
- Average cloud cover in September: 48
The months with the most cloud cover are February and November (Cloud cover 56).
The month with the least cloud cover is September (Cloud cover 48).
Average visibility in September
Dún Laoghaire, Ireland
- Average visibility in September: 9km
The months with the highest visibility are January, March, October and November (10km).
The months with the lowest visibility are February, April, May, June, July, August, September and December (9km).
Dún Laoghaire, Ireland
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