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
The transition into September notes an average high-temperature of a mild 14.8°C (58.6°F), revealing a mild distinction from the 16.4°C (61.5°F) in August. Rostrevor, during September nights, experiences a subtle shift to a low average of 10.3°C (50.5°F) from the day's heat.Humidity
In Rostrevor, the average relative humidity in September is 87%.Rainfall
In September, the rain falls for 15.6 days. Throughout September, 38mm (1.5") of precipitation is accumulated. In Rostrevor, during the entire year, the rain falls for 199.5 days and collects up to 567mm (22.32") of precipitation.Snowfall
In Rostrevor, United Kingdom, snow does not fall in May through October.Sea temperature
In Rostrevor, the average seawater temperature in September is 14.6°C (58.3°F).Note: In 14.6°C (58.3°F), even brief exposure to 13°C (55.4°F) feels biting, and anything less than 10°C (50°F) risks cold shock and impaired breathing, considering one's health.
Daylight
In September, the average length of the day in Rostrevor is 12h and 41min.On the first day of the month, sunrise is at 6:33 am and sunset at 8:15 pm. On the last day of September, sunrise is at 7:26 am and sunset at 7:03 pm BST.
Sunshine
The average sunshine in September is 6.2h.UV index
The months with the highest UV index are May, June, August and September, with an average maximum UV index of 4. A UV Index value of 3 to 5 symbolizes a medium vulnerability from unprotected exposure to Sun's UV rays for average individuals.Note: The daily maximum UV index of 4 in September interprets into the following advice:
Be cautious. Those with fair skin can be subjected to burns in fewer than 30 minutes. The best time to avoid the Sun's harmful UV radiation is during midday when it's most potent. To cut down UV radiation exposure by about half, sport a wide-brim hat.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the usual temperature for Rostrevor in September?
What is the average humidity in September?
How much does it rain in September?
When it does not snow?
What is the sea water temperature in September?
How many hours of daylight does Rostrevor have in September?
What time are sunrise and sunset in September?
How long on average sun shines in September?
When is the highest UV index?
What is the UV index reading in September?
Average temperature in September
Rostrevor, United Kingdom
- Average high temperature in September: 14.8°C
The warmest months (with the highest average high temperature) are July and August (16.4°C).
The month with the lowest average high temperature is January (6.7°C).
- Average low temperature in September: 10.3°C
The month with the highest average low temperature is August (11.5°C).
The coldest month (with the lowest average low temperature) is February (3.1°C).
Average pressure in September
Rostrevor, 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
Rostrevor, United Kingdom
- Average wind speed in September: 17.3km/h
The windiest month (with the highest average wind speed) is January (22.8km/h).
The calmest months (with the lowest average wind speed) are June and July (14.2km/h).
Average humidity in September
Rostrevor, United Kingdom
- Average humidity in September: 87%
The month with the highest relative humidity is December (88%).
The months with the lowest relative humidity are March, April and May (84%).
Average rainfall in September
Rostrevor, United Kingdom
- Average rainfall in September: 38mm
The wettest month (with the highest rainfall) is August (66mm).
The driest months (with the least rainfall) are January and April (35mm).
Average rainfall days in September
Rostrevor, United Kingdom
- Average rainfall days in September: 15.6 days
The month with the highest number of rainy days is August (21.6 days).
The month with the least rainy days is February (13.5 days).
Average snowfall in September
Rostrevor, United Kingdom
- Average snowfall in September: 0mm
The month with the highest snowfall is February (40mm).
The months with the least snowfall are May, June, July, August, September and October (0mm).
Average snowfall days in September
Rostrevor, United Kingdom
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (3.7 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average sea temperature in September
Rostrevor, United Kingdom
- Average sea temperature in September: 14.6°C
The best month for swimming (with the highest average sea temperature) is August (14.7°C).
The coldest month (with the lowest average sea temperature) is March (8.3°C).
Average daylight in September /
Average sunshine in September
Rostrevor, United Kingdom
- Average daylight in September: 12h and 4min
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 30min).
- Average sunshine in September: 6h and 1min
The month with the most sunshine is June (Average sunshine: 7h and 36min).
The month with the least sunshine is February (Average sunshine: 3h and 48min).
Average sunshine days in September
Rostrevor, United Kingdom
- Average sunshine days in September: 9.8 days
The months with the most sunshine days are January and November (12 days).
The month with the least sunshine days is August (6.1 days).
Average UV index in September
Rostrevor, 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
Rostrevor, United Kingdom
- Average cloud cover in September: 56
The months with the most cloud cover are January and February (Cloud cover 61).
The month with the least cloud cover is April (Cloud cover 52).
Average visibility in September
Rostrevor, United Kingdom
- Average visibility in September: 9km
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (9km).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (9km).
