September weather forecastDundrum, United Kingdom
September
Weather in September
September, the first month of the autumn in Dundrum, is still a refreshing month, with an average temperature fluctuating between 15.1°C (59.2°F) and 11°C (51.8°F).Temperature
Stepping into September, Dundrum records an average high-temperature of a moderate 15.1°C (59.2°F), almost consistent with August. Dundrum's nights in September maintain a consistent average of 11°C (51.8°F), demonstrating a minimal differential from its daytime temperature.Humidity
The average relative humidity in September is 86%.Rainfall
In September, in Dundrum, the rain falls for 11.5 days. Throughout September, 37mm (1.46") of precipitation is accumulated. In Dundrum, during the entire year, the rain falls for 181.5 days and collects up to 542mm (21.34") of precipitation.Snowfall
In Dundrum, snow does not fall in April through October.Sea temperature
In Dundrum, the average seawater temperature in September is 14.6°C (58.3°F).Note: Immersing oneself in 14.6°C (58.3°F) at sub-10°C (14°F) temperatures is a recipe for harsh cold shock and quickened breathing unless adequately equipped.
Daylight
In Dundrum, the average length of the day in September is 12h and 42min.On the first day of September in Dundrum, sunrise is at 6:32 am and sunset at 8:14 pm. On the last day of the month, sunrise is at 7:24 am and sunset at 7:01 pm BST.
Sunshine
The average sunshine in September in Dundrum is 6.5h.UV index
The months with the highest UV index in Dundrum are June, August and September, with an average maximum UV index of 4. A UV Index reading of 3 to 5 represents a moderate health risk from exposure to the Sun's UV radiation for the average person.Note: In September, the maximum UV index of 4 suggests this advice:
Be mindful. Those with pale skin might receive burns in fewer than 30 minutes. The Sun's most harmful UV rays are emitted around midday; avoid staying outdoors for long during this time. Limit sun-induced ocular harm with sunglasses that feature UVA and UVB filtration.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Dundrum, United Kingdom
- Average high temperature in September: 15.1°C
The warmest months (with the highest average high temperature) are July and August (16.6°C).
The month with the lowest average high temperature is February (7.1°C).
- Average low temperature in September: 11°C
The months with the highest average low temperature are July and August (12.1°C).
The coldest month (with the lowest average low temperature) is February (3.9°C).
Average pressure in September
Dundrum, United Kingdom
- Average pressure in September: 1014.6mbar
The month with the highest atmospheric pressure is May (1015.7mbar).
The month with the lowest atmospheric pressure is November (1007.6mbar).
Average wind speed in September
Dundrum, United Kingdom
- Average wind speed in September: 18.8km/h
The windiest month (with the highest average wind speed) is December (24.4km/h).
The calmest month (with the lowest average wind speed) is July (15km/h).
Average humidity in September
Dundrum, United Kingdom
- Average humidity in September: 86%
The month with the highest relative humidity is August (87%).
The months with the lowest relative humidity are March, April and May (83%).
Average rainfall in September
Dundrum, United Kingdom
- Average rainfall in September: 37mm
The wettest month (with the highest rainfall) is November (68mm).
The driest month (with the least rainfall) is May (32mm).
Average rainfall days in September
Dundrum, United Kingdom
- Average rainfall days in September: 11.5 days
The month with the highest number of rainy days is July (19.4 days).
The month with the least rainy days is September (11.5 days).
Average snowfall in September
Dundrum, United Kingdom
- Average snowfall in September: 0mm
The month with the highest snowfall is January (9mm).
The months with the least snowfall are April, May, June, July, August, September and October (0mm).
Average snowfall days in September
Dundrum, United Kingdom
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (2 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).
Average sea temperature in September
Dundrum, United Kingdom
- Average sea temperature in September: 14.6°C
The best month for swimming (with the highest average sea temperature) is August (14.8°C).
The coldest month (with the lowest average sea temperature) is March (8.2°C).
Average daylight in September /
Average sunshine in September
Dundrum, United Kingdom
- Average daylight in September: 12h and 42min
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 24min).
- Average sunshine in September: 6h and 30min
The month with the most sunshine is June (Average sunshine: 7h and 48min).
The months with the least sunshine are January and February (Average sunshine: 3h and 54min).
Average sunshine days in September
Dundrum, United Kingdom
- Average sunshine days in September: 15.7 days
The month with the most sunshine days is September (15.7 days).
The month with the least sunshine days is July (9.2 days).
Average UV index in September
Dundrum, United Kingdom
- Average UV index in September: 4
The months with the highest UV index are June, 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
Dundrum, United Kingdom
- Average cloud cover in September: 54
The months with the most cloud cover are January and February (Cloud cover 60).
The month with the least cloud cover is April (Cloud cover 51).
Average visibility in September
Dundrum, United Kingdom
- Average visibility in September: 10km
The months with the highest visibility are February, March, September, October, November and December (10km).
The months with the lowest visibility are January, April, May, June, July and August (9km).
