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 mild 14.7°C (58.5°F) in September, hardly different from the 15.9°C (60.6°F) recorded in August. September registers an average low temperature of 11.1°C (52°F) in Larne, subtly lower than the daytime maximum.Humidity
In Larne, the average relative humidity in September is 85%.Rainfall
April, May and September are months with the least rain when the rain falls for 16.9 days and typically aggregates up to 39mm (1.54") of rain.Snowfall
April through October are months without snowfall in Larne.Sea temperature
September is the month with the warmest seawater in Larne, with an average sea temperature of 14.3°C (57.7°F).Note: Swimming in 14.3°C (57.7°F) is deemed hazardous. Exposure to temperatures below 10°C (50°F) leads to immediate severe cold shock and hyperventilation.
Daylight
In September, the average length of the day in Larne, United Kingdom, is 12h and 43min.On the first day of the month, sunrise is at 6:31 am and sunset at 8:15 pm. On the last day of September, sunrise is at 7:24 am and sunset at 7:01 pm BST.
Sunshine
The average sunshine in September is 6.2h.UV index
The months with the highest UV index are June through September, with an average maximum UV index of 4. A UV Index of 3 to 5 symbolizes a moderate threat to health from unprotected exposure to Sun's UV rays for ordinary individuals.Note: The maximum daily UV index of 4 in September converts into the following recommendations:
Prioritize safety - The need to safeguard skin and eyes from harm is emphasized. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. During bright days, sunglasses that offer UVA and UVB defense are recommended.
Frequently asked questions
What is the temperature in September in Larne?
What is the average humidity in September in Larne?
What is the driest month in Larne?
How many days does it rain in September in Larne?
When it does not snow in Larne?
What month is the sea warmest in Larne?
What is the water temperature in September in Larne?
How many hours of daylight does Larne have in September?
When is the sunrise / sunset in September in Larne?
How long on average sun shines in September in Larne?
When is the highest UV index in Larne?
How high is the UV index in September in Larne?
Average temperature in September
Larne, United Kingdom
- Average high temperature in September: 14.7°C
The warmest month (with the highest average high temperature) is July (16.2°C).
The month with the lowest average high temperature is January (7°C).
- Average low temperature in September: 11.1°C
The month with the highest average low temperature is August (12.3°C).
The coldest month (with the lowest average low temperature) is February (3.9°C).
Average pressure in September
Larne, United Kingdom
- Average pressure in September: 1014mbar
The month with the highest atmospheric pressure is May (1015.5mbar).
The month with the lowest atmospheric pressure is November (1007.1mbar).
Average wind speed in September
Larne, United Kingdom
- Average wind speed in September: 21km/h
The windiest month (with the highest average wind speed) is December (26.6km/h).
The calmest month (with the lowest average wind speed) is June (16.1km/h).
Average humidity in September
Larne, United Kingdom
- Average humidity in September: 85%
The months with the highest relative humidity are July and August (86%).
The months with the lowest relative humidity are April and May (82%).
Average rainfall in September
Larne, United Kingdom
- Average rainfall in September: 39mm
The wettest month (with the highest rainfall) is August (75mm).
The driest months (with the least rainfall) are April, May and September (39mm).
Average rainfall days in September
Larne, United Kingdom
- Average rainfall days in September: 16.9 days
The month with the highest number of rainy days is August (22.3 days).
The month with the least rainy days is April (16.3 days).
Average snowfall in September
Larne, United Kingdom
- Average snowfall in September: 0mm
The months with the highest snowfall are February and March (8mm).
The months with the least snowfall are April, May, June, July, August, September and October (0mm).
Average snowfall days in September
Larne, United Kingdom
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (2 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average sea temperature in September
Larne, United Kingdom
- Average sea temperature in September: 14.3°C
The best month for swimming (with the highest average sea temperature) is September (14.3°C).
The coldest month (with the lowest average sea temperature) is March (8°C).
Average daylight in September /
Average sunshine in September
Larne, United Kingdom
- Average daylight in September: 12h and 4min
The month with the longest days is June (Average daylight: 17h and 12min).
The month with the shortest days is December (Average daylight: 7h and 18min).
- Average sunshine in September: 6h and 1min
The month with the most sunshine is June (Average sunshine: 7h and 54min).
The months with the least sunshine are January and February (Average sunshine: 3h and 48min).
Average sunshine days in September
Larne, United Kingdom
- Average sunshine days in September: 8.4 days
The month with the most sunshine days is April (10.9 days).
The month with the least sunshine days is August (5.7 days).
Average UV index in September
Larne, United Kingdom
- Average UV index in September: 4
The months with the highest UV index are 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
Larne, United Kingdom
- Average cloud cover in September: 56
The month with the most cloud cover is January (Cloud cover 63).
The months with the least cloud cover are April and May (Cloud cover 53).
Average visibility in September
Larne, United Kingdom
- Average visibility in September: 10km
The months with the highest visibility are March, September and November (10km).
The months with the lowest visibility are January, February, April, May, June, July, August, October and December (9km).
Larne, United Kingdom
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