September weather forecastDundalk, Ireland
September
Weather in September
September brings further reduction in Dundalk's average temperatures from 9°C (48.2°F) to 15.1°C (59.2°F), affirming the season's shift towards fall. The hours of daylight decrease considerably to 12.7 hours, indicating the looming onset of winter. However, the sunshine duration remains surprisingly steady at 5.6 hours. September also brings less rainfall than previous months, resulting in an overall drier atmosphere. While summer's warmth gradually retreats, Dundalk's landscapes transform under the spectrum of fall, creating a picturesque scenery for locals and visitors.Temperature
September's arrival in Dundalk, Ireland, brings an average high-temperature of a mild 15.1°C (59.2°F), demonstrating subtle variation from the preceding month. In Dundalk, the average nighttime temperature during September is a chilly 9°C (48.2°F).Humidity
In Dundalk, the average relative humidity in September is 89%.Rainfall
In Dundalk, in September, during 7 rainfall days, 10mm (0.39") of precipitation is typically accumulated. Throughout the year, in Dundalk, there are 120.2 rainfall days, and 161mm (6.34") of precipitation is accumulated.Snowfall
In Dundalk, snow does not fall in April through November.Daylight
In September, the average length of the day in Dundalk is 12h and 41min.On the first day of September, sunrise is at 6:35 am and sunset at 8:15 pm. On the last day of the month, sunrise is at 7:26 am and sunset at 7:04 pm IST.
Sunshine
The average sunshine in September in Dundalk is 5.6h.UV index
In Dundalk, the average daily maximum UV index in September is 3. A UV Index value of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV rays for average individuals.Note: The maximum daily UV index of 3 during September translates into the following directions:
Put precautions into practice - Protective measures against sun-induced damage are advised. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Equip yourself with UVA and UVB-filtering sunglasses on clear, sunny days.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Dundalk, Ireland
- Average high temperature in September: 15.1°C
The warmest month (with the highest average high temperature) is July (17.3°C).
The month with the lowest average high temperature is January (6.8°C).
- Average low temperature in September: 9°C
The month with the highest average low temperature is July (10.7°C).
The coldest month (with the lowest average low temperature) is January (2.2°C).
Average pressure in September
Dundalk, Ireland
- Average pressure in September: 1014.7mbar
The month with the highest atmospheric pressure is May (1015.7mbar).
The month with the lowest atmospheric pressure is November (1007.7mbar).
Average wind speed in September
Dundalk, Ireland
- Average wind speed in September: 14.9km/h
The windiest month (with the highest average wind speed) is January (20.2km/h).
The calmest months (with the lowest average wind speed) are June and July (13km/h).
Average humidity in September
Dundalk, Ireland
- Average humidity in September: 89%
The month with the highest relative humidity is December (91%).
The months with the lowest relative humidity are March and April (85%).
Average rainfall in September
Dundalk, Ireland
- Average rainfall in September: 10mm
The wettest month (with the highest rainfall) is June (21mm).
The driest month (with the least rainfall) is January (8mm).
Average rainfall days in September
Dundalk, Ireland
- Average rainfall days in September: 7 days
The month with the highest number of rainy days is July (14.3 days).
The month with the least rainy days is September (7 days).
Average snowfall in September
Dundalk, Ireland
- Average snowfall in September: 0mm
The month with the highest snowfall is February (6mm).
The months with the least snowfall are April, May, June, July, August, September, October and November (0mm).
Average snowfall days in September
Dundalk, Ireland
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (1.4 days).
The months with the least snowfall days are May, June, July, August, September, October and November (0 days).
Average daylight in September /
Average sunshine in September
Dundalk, Ireland
- Average daylight in September: 12h and 42min
The month with the longest days is June (Average daylight: 17h and 0min).
The month with the shortest days is December (Average daylight: 7h and 30min).
- Average sunshine in September: 5h and 36min
The month with the most sunshine is June (Average sunshine: 6h and 42min).
The months with the least sunshine are February and October (Average sunshine: 3h and 42min).
Average sunshine days in September
Dundalk, Ireland
- Average sunshine days in September: 15.6 days
The month with the most sunshine days is October (18.8 days).
The month with the least sunshine days is July (9.5 days).
Average UV index in September
Dundalk, Ireland
- Average UV index in September: 3
The months with the highest UV index are June and August (UV index 4).
The month with the lowest UV index is February (UV index 1).
Average cloud cover in September
Dundalk, Ireland
- Average cloud cover in September: 61
The months with the most cloud cover are July and August (Cloud cover 66).
The month with the least cloud cover is April (Cloud cover 57).
Average visibility in September
Dundalk, Ireland
- Average visibility in September: 8km
The months with the highest visibility are January, February, March, April, May, October, November and December (9km).
The months with the lowest visibility are June, July, August and September (8km).
