September weather forecastCairnryan, United Kingdom
September
Weather in September
September, the first month of the autumn in Cairnryan, is still a refreshing month, with an average temperature fluctuating between 14.6°C (58.3°F) and 11.9°C (53.4°F).Temperature
Cairnryan registers an average high-temperature of a still refreshing 14.6°C (58.3°F) with the arrival of September, showing minor deviation from the preceding month. September's average low-temperature in Cairnryan is a cool 11.9°C (53.4°F), reflecting a minor difference from the day's peak temperatures.Humidity
The average relative humidity in September in Cairnryan is 84%.Rainfall
In September, in Cairnryan, the rain falls for 16.5 days. Throughout September, 45mm (1.77") of precipitation is accumulated. Throughout the year, there are 210.9 rainfall days, and 632mm (24.88") of precipitation is accumulated.Snowfall
April through November are months without snowfall in Cairnryan.Sea temperature
August and September, with an average sea temperature of 14.3°C (57.7°F), are months with the warmest seawater in Cairnryan, United Kingdom.Note: Diving into 14.3°C (57.7°F) when it's under 10°C (50°F) can cause immediate cold shock symptoms, marked by hyperventilation.
Daylight
In Cairnryan, United Kingdom, the average length of the day in September is 12h and 43min.On the first day of September, sunrise is at 6:27 am and sunset at 8:12 pm. On the last day of the month, sunrise is at 7:21 am and sunset at 6:58 pm BST.
Sunshine
The average sunshine in September is 6.2h.UV index
The months with the highest UV index in Cairnryan, United Kingdom, are May through September, with an average maximum UV index of 4. A UV Index value of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV rays for average individuals.Note: A daily maximum UV index of 4 in September translates into the following instructions:
Undertake protective steps - Obligation to safeguard skin and eyes from harm is in place. To prevent harmful UV exposure, minimize direct contact with the Sun around midday. Employ a hat with a wide brim for robust protection, cutting UV exposure by half.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Cairnryan, United Kingdom
- Average high temperature in September: 14.6°C
The warmest month (with the highest average high temperature) is July (15.9°C).
The month with the lowest average high temperature is February (6.9°C).
- Average low temperature in September: 11.9°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 (4.3°C).
Average pressure in September
Cairnryan, United Kingdom
- Average pressure in September: 1014.1mbar
The month with the highest atmospheric pressure is May (1015.6mbar).
The month with the lowest atmospheric pressure is November (1007.3mbar).
Average wind speed in September
Cairnryan, United Kingdom
- Average wind speed in September: 22.7km/h
The windiest month (with the highest average wind speed) is December (29.5km/h).
The calmest month (with the lowest average wind speed) is June (17.4km/h).
Average humidity in September
Cairnryan, United Kingdom
- Average humidity in September: 84%
The month with the highest relative humidity is August (86%).
The months with the lowest relative humidity are April, May and November (81%).
Average rainfall in September
Cairnryan, United Kingdom
- Average rainfall in September: 45mm
The wettest month (with the highest rainfall) is November (72mm).
The driest months (with the least rainfall) are April and May (32mm).
Average rainfall days in September
Cairnryan, United Kingdom
- Average rainfall days in September: 16.5 days
The month with the highest number of rainy days is August (20.7 days).
The month with the least rainy days is May (14.5 days).
Average snowfall in September
Cairnryan, United Kingdom
- Average snowfall in September: 0mm
The month with the highest snowfall is January (14mm).
The months with the least snowfall are April, May, June, July, August, September, October and November (0mm).
Average snowfall days in September
Cairnryan, United Kingdom
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (2.2 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).
Average sea temperature in September
Cairnryan, United Kingdom
- Average sea temperature in September: 14.3°C
The best months for swimming (with the highest average sea temperature) are August and September (14.3°C).
The coldest month (with the lowest average sea temperature) is March (7.8°C).
Average daylight in September /
Average sunshine in September
Cairnryan, United Kingdom
- 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 18min).
- Average sunshine in September: 6h and 12min
The month with the most sunshine is June (Average sunshine: 7h and 48min).
The month with the least sunshine is January (Average sunshine: 3h and 30min).
Average sunshine days in September
Cairnryan, United Kingdom
- Average sunshine days in September: 11.5 days
The month with the most sunshine days is May (14.2 days).
The month with the least sunshine days is December (7.2 days).
Average UV index in September
Cairnryan, United Kingdom
- 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, March, November and December (UV index 2).
Average cloud cover in September
Cairnryan, United Kingdom
- Average cloud cover in September: 58
The month with the most cloud cover is January (Cloud cover 66).
The months with the least cloud cover are April and May (Cloud cover 52).
Average visibility in September
Cairnryan, United Kingdom
- Average visibility in September: 10km
The months with the highest visibility are March, April, May, June, September, October, November and December (10km).
The months with the lowest visibility are January, February, July and August (9km).
