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 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 brings an average high-temperature of a still comfortable 16.8°C (62.2°F), showing a slight difference from August's 18.2°C (64.8°F). Portesham sees a gentle drop from the daily peak temperature in September, with an average low settling at a moderate 14°C (57.2°F).Humidity
February through April, September through December, with an average relative humidity of 81%, are the least humid months.Rainfall
In Portesham, in September, it is raining for 11.1 days, with typically 29mm (1.14") of accumulated precipitation. In Portesham, during the entire year, the rain falls for 167.3 days and collects up to 471mm (18.54") of precipitation.Snowfall
In Portesham, snow does not fall in March through October and December.Daylight
The average length of the day in September in Portesham, United Kingdom, is 12h and 37min.On the first day of September in Portesham, sunrise is at 6:25 am and sunset at 7:55 pm. On the last day of the month, sunrise is at 7:09 am and sunset at 6:50 pm BST.
Sunshine
In Portesham, the average sunshine in September is 8.1h.UV index
In September, the average daily maximum UV index in Portesham is 4. A UV Index reading of 3 to 5 represents a medium health hazard from exposure to the Sun's UV radiation for average individuals.Note: The maximum UV index of 4 during September leads to these instructions:
Guard yourself - An obligation to protect skin and eyes from harm exists. UV radiation is strongest from the Sun during midday; protect yourself by staying in shaded areas. In the presence of strong sunlight, it's crucial to wear sunglasses that ward off UVA and UVB rays.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in Portesham in September?
What are the least humid months in Portesham?
What is the average humidity in September in Portesham?
How much does it rain in Portesham in September?
When it does not snow in Portesham?
How many hours of daylight does Portesham have in September?
What time are sunrise and sunset in September in Portesham?
How long on average sun shines in September in Portesham?
What is the UV index intensity in September in Portesham?
Average temperature in September
Portesham, United Kingdom
- Average high temperature in September: 16.8°C
The warmest month (with the highest average high temperature) is August (18.2°C).
The month with the lowest average high temperature is February (8.3°C).
- Average low temperature in September: 14°C
The month with the highest average low temperature is August (15.3°C).
The coldest month (with the lowest average low temperature) is February (5.8°C).
Average pressure in September
Portesham, United Kingdom
- Average pressure in September: 1017.3mbar
The month with the highest atmospheric pressure is September (1017.3mbar).
The month with the lowest atmospheric pressure is November (1010.6mbar).
Average wind speed in September
Portesham, United Kingdom
- Average wind speed in September: 22.8km/h
The windiest month (with the highest average wind speed) is December (30.1km/h).
The calmest month (with the lowest average wind speed) is July (19.5km/h).
Average humidity in September
Portesham, United Kingdom
- Average humidity in September: 81%
The months with the highest relative humidity are June and July (83%).
The months with the lowest relative humidity are February, March, April, September, October, November and December (81%).
Average rainfall in September
Portesham, United Kingdom
- Average rainfall in September: 29mm
The wettest month (with the highest rainfall) is November (58mm).
The driest month (with the least rainfall) is May (27mm).
Average rainfall days in September
Portesham, United Kingdom
- Average rainfall days in September: 11.1 days
The month with the highest number of rainy days is November (17 days).
The month with the least rainy days is September (11.1 days).
Average snowfall in September
Portesham, United Kingdom
- Average snowfall in September: 0mm
The month with the highest snowfall is February (2mm).
The months with the least snowfall are March, April, May, June, July, August, September, October and December (0mm).
Average snowfall days in September
Portesham, United Kingdom
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (1.2 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Portesham, United Kingdom
- Average daylight in September: 12h and 4min
The month with the longest days is June (Average daylight: 16h and 24min).
The month with the shortest days is December (Average daylight: 8h and 6min).
- Average sunshine in September: 8h and 1min
The month with the most sunshine is July (Average sunshine: 9h and 24min).
The months with the least sunshine are January, February and November (Average sunshine: 4h and 6min).
Average sunshine days in September
Portesham, United Kingdom
- Average sunshine days in September: 15.6 days
The month with the most sunshine days is September (15.6 days).
The month with the least sunshine days is November (10.1 days).
Average UV index in September
Portesham, United Kingdom
- Average UV index in September: 4
The months with the highest UV index are July and August (UV index 5).
The months with the lowest UV index are January and February (UV index 2).
Average cloud cover in September
Portesham, United Kingdom
- Average cloud cover in September: 43
The month with the most cloud cover is December (Cloud cover 59).
The month with the least cloud cover is July (Cloud cover 40).
Average visibility in September
Portesham, 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).
