September weather forecastPortlethen, United Kingdom
September
Weather in September
September, the first month of the autumn in Portlethen, is still a refreshing month, with an average temperature varying between 10.3°C (50.5°F) and 14.1°C (57.4°F).Temperature
The beginning of September reveals an average high-temperature of a still mild 14.1°C (57.4°F), showing minimal deviation from the previous month. Portlethen records a consistent average nighttime temperature of 10.3°C (50.5°F) in September, slightly lower than the daytime high.Humidity
The average relative humidity in September is 84%.Rainfall
In September, in Portlethen, the rain falls for 9.7 days. Throughout September, 11mm (0.43") of precipitation is accumulated. In Portlethen, during the entire year, the rain falls for 142.7 days and collects up to 226mm (8.9") of precipitation.Snowfall
In Portlethen, United Kingdom, snow does not fall in May through October.Sea temperature
In Portlethen, United Kingdom, the average seawater temperature in September is 13.3°C (55.9°F).Note: One needs to be cautious in 13.3°C (55.9°F) waters. 13°C (55.4°F) is already forbidding, but sub-10°C (14°F) can seriously disrupt your breathing and lead to a frigid shock, considering one's well-being.
Daylight
In Portlethen, the average length of the day in September is 12h and 46min.On the first day of the month, sunrise is at 6:11 am and sunset at 8:04 pm. On the last day of September, sunrise is at 7:11 am and sunset at 6:45 pm BST.
Sunshine
The average sunshine in September in Portlethen is 7.4h.UV index
The months with the highest UV index in Portlethen are June through September, with an average maximum UV index of 4. A UV Index estimate of 3 to 5 represents a medium vulnerability from unsafe exposure to UV radiation for the ordinary person.Note: The maximum daily UV index, 4 in September, converts into the following recommendations:
Be mindful. Those with pale skin might receive burns in fewer than 30 minutes. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. For minimizing sun-related eye damage, always choose sunglasses with UVA and UVB coverage.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Portlethen, United Kingdom
- Average high temperature in September: 14.1°C
The warmest months (with the highest average high temperature) are July and August (15.8°C).
The month with the lowest average high temperature is January (5.6°C).
- Average low temperature in September: 10.3°C
The month with the highest average low temperature is August (11.6°C).
The coldest month (with the lowest average low temperature) is January (2.9°C).
Average pressure in September
Portlethen, United Kingdom
- Average pressure in September: 1012.6mbar
The month with the highest atmospheric pressure is May (1015.2mbar).
The month with the lowest atmospheric pressure is November (1006.5mbar).
Average wind speed in September
Portlethen, United Kingdom
- Average wind speed in September: 19.3km/h
The windiest month (with the highest average wind speed) is December (25.1km/h).
The calmest month (with the lowest average wind speed) is July (14.7km/h).
Average humidity in September
Portlethen, United Kingdom
- Average humidity in September: 84%
The months with the highest relative humidity are June and July (85%).
The months with the lowest relative humidity are March and April (81%).
Average rainfall in September
Portlethen, United Kingdom
- Average rainfall in September: 11mm
The wettest month (with the highest rainfall) is November (30mm).
The driest month (with the least rainfall) is April (9mm).
Average rainfall days in September
Portlethen, United Kingdom
- Average rainfall days in September: 9.7 days
The month with the highest number of rainy days is July (16.4 days).
The month with the least rainy days is February (9.2 days).
Average snowfall in September
Portlethen, United Kingdom
- Average snowfall in September: 0mm
The month with the highest snowfall is February (20mm).
The months with the least snowfall are May, June, July, August, September and October (0mm).
Average snowfall days in September
Portlethen, United Kingdom
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (3.9 days).
The months with the least snowfall days are June, July, August, September and October (0 days).
Average sea temperature in September
Portlethen, United Kingdom
- Average sea temperature in September: 13.3°C
The best month for swimming (with the highest average sea temperature) is August (13.8°C).
The coldest months (with the lowest average sea temperature) are February and March (6.7°C).
Average daylight in September /
Average sunshine in September
Portlethen, United Kingdom
- Average daylight in September: 12h and 48min
The month with the longest days is June (Average daylight: 17h and 48min).
The month with the shortest days is December (Average daylight: 6h and 48min).
- Average sunshine in September: 7h and 24min
The month with the most sunshine is June (Average sunshine: 7h and 54min).
The month with the least sunshine is November (Average sunshine: 4h and 12min).
Average sunshine days in September
Portlethen, United Kingdom
- Average sunshine days in September: 16.4 days
The month with the most sunshine days is September (16.4 days).
The month with the least sunshine days is July (10.4 days).
Average UV index in September
Portlethen, 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
Portlethen, United Kingdom
- Average cloud cover in September: 49
The month with the most cloud cover is November (Cloud cover 57).
The month with the least cloud cover is September (Cloud cover 49).
Average visibility in September
Portlethen, United Kingdom
- Average visibility in September: 10km
The months with the highest visibility are January, February, March, April, September, October, November and December (10km).
The months with the lowest visibility are May, June, July and August (9km).
