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 initiation of September sees an average high-temperature of a still comfortable 16.4°C (61.5°F), showing minor variations from the previous month. Night temperatures in September in Porthleven, United Kingdom, exhibit a subtle decrease, settling at an average of 14.6°C (58.3°F).Humidity
In September, the average relative humidity is 82%.Rainfall
In Porthleven, in September, it is raining for 14.7 days, with typically 34mm (1.34") of accumulated precipitation. Throughout the year, in Porthleven, United Kingdom, there are 204.9 rainfall days, and 617mm (24.29") of precipitation is accumulated.Snowfall
March through December are months without snowfall in Porthleven.Sea temperature
In Porthleven, the average seawater temperature in September is 16.3°C (61.3°F).Note: For most individuals, swimming in 16.3°C (61.3°F) is not enjoyable. As the water temperature decreases from 21°C (69.8°F) to 15°C (59°F), breathing control becomes increasingly difficult.
Daylight
In September, the average length of the day is 12h and 37min.On the first day of September, sunrise is at 6:37 am and sunset at 8:05 pm. On the last day of the month, sunrise is at 7:20 am and sunset at 7:01 pm BST.
Sunshine
The average sunshine in September in Porthleven, United Kingdom, is 7.5h.UV index
In September, the average daily maximum UV index is 4. A UV Index estimate of 3 to 5 represents a moderate health risk from exposure to the Sun's UV radiation for average individuals.Note: In September, the UV index of 4 transforms into the following advice:
Act with care - Obligation to protect against skin and eye damage is highlighted. Avoiding the Sun during its peak radiation time around midday is a healthy practice. To best shield against UV radiation, choose sun-safe garments and dependable sunglasses.
Frequently asked questions
What is the temperature in September in Porthleven?
What is the average humidity in September in Porthleven?
How much does it rain in Porthleven in September?
When it does not snow in Porthleven?
What is the sea water temperature in September in Porthleven?
What is the average length of the day in September in Porthleven?
What time are sunrise and sunset in September in Porthleven?
How long on average sun shines in September in Porthleven?
What is the UV index reading in September in Porthleven?
Average temperature in September
Porthleven, United Kingdom
- Average high temperature in September: 16.4°C
The warmest month (with the highest average high temperature) is August (17.4°C).
The month with the lowest average high temperature is February (9.3°C).
- Average low temperature in September: 14.6°C
The month with the highest average low temperature is August (15.8°C).
The coldest month (with the lowest average low temperature) is February (7.1°C).
Average pressure in September
Porthleven, United Kingdom
- Average pressure in September: 1017.5mbar
The month with the highest atmospheric pressure is September (1017.5mbar).
The month with the lowest atmospheric pressure is November (1010.5mbar).
Average wind speed in September
Porthleven, United Kingdom
- Average wind speed in September: 24.3km/h
The windiest month (with the highest average wind speed) is December (32.9km/h).
The calmest month (with the lowest average wind speed) is July (20.8km/h).
Average humidity in September
Porthleven, United Kingdom
- Average humidity in September: 82%
The months with the highest relative humidity are June and July (84%).
The months with the lowest relative humidity are February, November and December (79%).
Average rainfall in September
Porthleven, United Kingdom
- Average rainfall in September: 34mm
The wettest month (with the highest rainfall) is November (91mm).
The driest month (with the least rainfall) is May (29mm).
Average rainfall days in September
Porthleven, United Kingdom
- Average rainfall days in September: 14.7 days
The month with the highest number of rainy days is December (21.7 days).
The month with the least rainy days is May (13.6 days).
Average snowfall in September
Porthleven, United Kingdom
- Average snowfall in September: 0mm
The month with the highest snowfall is February (3mm).
The months with the least snowfall are March, April, May, June, July, August, September, October, November and December (0mm).
Average snowfall days in September
Porthleven, United Kingdom
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (0.8 days).
The months with the least snowfall days are March, April, May, June, July, August, September, October and November (0 days).
Average sea temperature in September
Porthleven, United Kingdom
- Average sea temperature in September: 16.3°C
The best month for swimming (with the highest average sea temperature) is August (17.1°C).
The coldest month (with the lowest average sea temperature) is March (9.7°C).
Average daylight in September /
Average sunshine in September
Porthleven, United Kingdom
- Average daylight in September: 12h and 4min
The month with the longest days is June (Average daylight: 16h and 18min).
The month with the shortest days is December (Average daylight: 8h and 12min).
- Average sunshine in September: 7h and 3min
The months with the most sunshine are April and July (Average sunshine: 8h and 30min).
The month with the least sunshine is December (Average sunshine: 3h and 54min).
Average sunshine days in September
Porthleven, United Kingdom
- Average sunshine days in September: 11 days
The month with the most sunshine days is May (14.8 days).
The month with the least sunshine days is November (5.3 days).
Average UV index in September
Porthleven, United Kingdom
- Average UV index in September: 4
The month with the highest UV index is August (UV index 5).
The month with the lowest UV index is January (UV index 2).
Average cloud cover in September
Porthleven, United Kingdom
- Average cloud cover in September: 47
The month with the most cloud cover is December (Cloud cover 62).
The month with the least cloud cover is April (Cloud cover 43).
Average visibility in September
Porthleven, United Kingdom
- Average visibility in September: 10km
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
Porthleven, United Kingdom
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