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
September
Weather in September
Temperature
September's beginning signals an average high-temperature of a still mild 14.7°C (58.5°F), barely different from August's 15.9°C (60.6°F). Portrush records a slight downturn in temperature to an average of 10.7°C (51.3°F) during September nights.Humidity
In Portrush, the average relative humidity in September is 85%.Rainfall
In Portrush, in September, during 19.6 rainfall days, 40mm (1.57") of precipitation is typically accumulated. In Portrush, during the entire year, the rain falls for 238.3 days and collects up to 632mm (24.88") of precipitation.Snowfall
May through October are months without snowfall in Portrush.Sea temperature
In September, the average sea temperature in Portrush is 14.2°C (57.6°F).Note: Being in 14.2°C (57.6°F) waters at 13°C (55.4°F) is discomforting, but anything below 10°C (50°F) can jeopardize breathing and induce cold shock, factoring in physical endurance.
Daylight
In September, the average length of the day in Portrush is 12h and 43min.On the first day of September, sunrise is at 6:33 am and sunset at 8:19 pm. On the last day of the month, sunrise is at 7:28 am and sunset at 7:04 pm BST.
Sunshine
In September, the average sunshine in Portrush is 6h.UV index
May, June, August and September, with an average maximum UV index of 4, are months with the highest UV index. A UV Index reading of 3 to 5 represents a moderate threat to health from unsafe exposure to UV radiation for the ordinary person.Note: The maximum UV index of 4 during September leads to these instructions:
Be vigilant - Suggestions to stave off sun damage are provided. Minimize direct exposure to the Sun during midday when its radiation is at its peak. Wearing a wide-brim hat can block approximately 50% of UV radiation, protecting the eyes.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in Portrush in September?
What is the average humidity in September in Portrush?
How many days does it rain in September in Portrush?
When it does not snow in Portrush?
What is the sea water temperature in September in Portrush?
What is the average length of the day in September in Portrush?
When is the sunrise / sunset in September in Portrush?
How many hours of sunshine does Portrush have in September?
What is the month with the highest UV index in Portrush?
How high is the UV index in September in Portrush?
Average temperature in September
Portrush, United Kingdom
- Average high temperature in September: 14.7°C
The warmest month (with the highest average high temperature) is July (16°C).
The month with the lowest average high temperature is January (7.1°C).
- Average low temperature in September: 10.7°C
The month with the highest average low temperature is August (11.8°C).
The coldest month (with the lowest average low temperature) is February (4°C).
Average pressure in September
Portrush, United Kingdom
- Average pressure in September: 1013.5mbar
The month with the highest atmospheric pressure is May (1015.2mbar).
The month with the lowest atmospheric pressure is November (1006.6mbar).
Average wind speed in September
Portrush, United Kingdom
- Average wind speed in September: 21.1km/h
The windiest month (with the highest average wind speed) is January (27.5km/h).
The calmest month (with the lowest average wind speed) is July (16.7km/h).
Average humidity in September
Portrush, United Kingdom
- Average humidity in September: 85%
The months with the highest relative humidity are July and August (86%).
The month with the lowest relative humidity is April (81%).
Average rainfall in September
Portrush, United Kingdom
- Average rainfall in September: 40mm
The wettest months (with the highest rainfall) are July and August (74mm).
The driest month (with the least rainfall) is April (35mm).
Average rainfall days in September
Portrush, United Kingdom
- Average rainfall days in September: 19.6 days
The month with the highest number of rainy days is August (24 days).
The month with the least rainy days is April (16.8 days).
Average snowfall in September
Portrush, United Kingdom
- Average snowfall in September: 0mm
The month with the highest snowfall is February (16mm).
The months with the least snowfall are May, June, July, August, September and October (0mm).
Average snowfall days in September
Portrush, United Kingdom
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (2.5 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average sea temperature in September
Portrush, United Kingdom
- Average sea temperature in September: 14.2°C
The best month for swimming (with the highest average sea temperature) is August (14.3°C).
The coldest month (with the lowest average sea temperature) is March (8.3°C).
Average daylight in September /
Average sunshine in September
Portrush, United Kingdom
- Average daylight in September: 12h and 4min
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 12min).
- Average sunshine in September: 6h and 0min
The month with the most sunshine is June (Average sunshine: 8h and 0min).
The month with the least sunshine is January (Average sunshine: 3h and 48min).
Average sunshine days in September
Portrush, United Kingdom
- Average sunshine days in September: 6.3 days
The month with the most sunshine days is April (9.8 days).
The month with the least sunshine days is August (4.2 days).
Average UV index in September
Portrush, United Kingdom
- Average UV index in September: 4
The months with the highest UV index are May, 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
Portrush, United Kingdom
- Average cloud cover in September: 58
The month with the most cloud cover is January (Cloud cover 63).
The month with the least cloud cover is April (Cloud cover 52).
Average visibility in September
Portrush, United Kingdom
- Average visibility in September: 9km
The month with the highest visibility is November (10km).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October and December (9km).
