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 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 is marked by an average high-temperature of a still enjoyable 16.4°C (61.5°F), almost identical to the preceding month. Nighttime temperature reflects an average dip to a moderate 14.9°C (58.8°F) in September, subtly cooler than its daytime highs.Humidity
In Isles of Scilly, the average relative humidity in September is 82%.Rainfall
In Isles of Scilly, in September, it is raining for 14.4 days, with typically 33mm (1.3") of accumulated precipitation. Throughout the year, there are 200.8 rainfall days, and 599mm (23.58") of precipitation is accumulated.Snowfall
In Isles of Scilly, snow does not fall in January, February, April through September, November and December.Sea temperature
In September, the average sea temperature is 16.8°C (62.2°F).Note: In water with a temperature of 16.8°C (62.2°F), most individuals do not find swimming enjoyable. As the temperature falls from 21°C (69.8°F) to 15°C (59°F), breathing control becomes more difficult.
Daylight
The average length of the day in September is 12h and 37min.On the first day of September, sunrise is at 6:41 am and sunset at 8:08 pm. On the last day of the month, sunrise is at 7:24 am and sunset at 7:05 pm BST.
Sunshine
In September, the average sunshine is 7.2h.UV index
In September, the average daily maximum UV index is 4. A UV Index reading of 3 to 5 represents a medium health hazard from exposure to the Sun's UV rays for ordinary individuals.Note: The daily high UV index of 4 during September translates into the following recommendations:
Take necessary precautions - Suggestions to elude sunburn are provided. The best time to avoid the Sun's harmful UV radiation is during midday when it's most potent. Sunglasses that guard against UVA and UVB rays are pivotal in minimizing sun-induced ocular damage.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the usual temperature for Isles of Scilly in September?
What is the average humidity in September?
How much does it rain in September?
When it does not snow?
Does it snow in September?
What is the sea water temperature in September?
How many hours of daylight does Isles of Scilly have in September?
What time are sunrise and sunset in September?
How long on average sun shines in September?
How high is the UV index in September?
Average temperature in September
Isles of Scilly, United Kingdom
- Average high temperature in September: 16.4°C
The warmest month (with the highest average high temperature) is August (17.2°C).
The month with the lowest average high temperature is February (9.7°C).
- Average low temperature in September: 14.9°C
The month with the highest average low temperature is August (15.9°C).
The coldest month (with the lowest average low temperature) is February (7.9°C).
Average pressure in September
Isles of Scilly, United Kingdom
- Average pressure in September: 1017.6mbar
The month with the highest atmospheric pressure is September (1017.6mbar).
The month with the lowest atmospheric pressure is November (1010.6mbar).
Average wind speed in September
Isles of Scilly, United Kingdom
- Average wind speed in September: 26.9km/h
The windiest month (with the highest average wind speed) is December (35.9km/h).
The calmest month (with the lowest average wind speed) is July (23.8km/h).
Average humidity in September
Isles of Scilly, United Kingdom
- Average humidity in September: 82%
The month with the highest relative humidity is June (85%).
The months with the lowest relative humidity are January, February, November and December (78%).
Average rainfall in September
Isles of Scilly, United Kingdom
- Average rainfall in September: 33mm
The wettest month (with the highest rainfall) is November (86mm).
The driest month (with the least rainfall) is May (29mm).
Average rainfall days in September
Isles of Scilly, United Kingdom
- Average rainfall days in September: 14.4 days
The month with the highest number of rainy days is November (21.3 days).
The month with the least rainy days is June (13.1 days).
Average snowfall days in September
Isles of Scilly, United Kingdom
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is March (0.2 days).
The months with the least snowfall days are January, February, April, May, June, July, August, September, November and December (0 days).
Average sea temperature in September
Isles of Scilly, United Kingdom
- Average sea temperature in September: 16.8°C
The best month for swimming (with the highest average sea temperature) is August (17.3°C).
The coldest month (with the lowest average sea temperature) is March (10.1°C).
Average daylight in September /
Average sunshine in September
Isles of Scilly, 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 1min
The month with the most sunshine is May (Average sunshine: 8h and 30min).
The month with the least sunshine is December (Average sunshine: 3h and 54min).
Average sunshine days in September
Isles of Scilly, United Kingdom
- Average sunshine days in September: 12.1 days
The month with the most sunshine days is June (15 days).
The month with the least sunshine days is November (5.7 days).
Average UV index in September
Isles of Scilly, United Kingdom
- Average UV index in September: 4
The month with the highest UV index is August (UV index 5).
The months with the lowest UV index are January, February, March, April, November and December (UV index 3).
Average cloud cover in September
Isles of Scilly, United Kingdom
- Average cloud cover in September: 48
The months with the most cloud cover are January and December (Cloud cover 62).
The month with the least cloud cover is April (Cloud cover 44).
Average visibility in September
Isles of Scilly, 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).
