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
Weather in September
Temperature
In September, Isles of Scilly experiences a barely noticeable shift in meteorological conditions, with average high-temperatures moving from 17.2°C in August to a still refreshing 16.4°C. Nights in Isles of Scilly during September maintain a steady temperature, averaging at a moderate 14.9°C.Humidity
In September, the average relative humidity is 82%.Rainfall
In Isles of Scilly, in September, during 14.4 rainfall days, 33mm of precipitation is typically accumulated. In Isles of Scilly, United Kingdom, during the entire year, the rain falls for 200.8 days and collects up to 599mm of precipitation.Snowfall
January, February, April through September, November and December are months without snowfall in Isles of Scilly.Sea temperature
In Isles of Scilly, the average seawater temperature in September is 16.8°C.Note: Swimming becomes less enjoyable for most at a surface water temperature of 16.8°C. As the temperature decreases below 21°C, breathing becomes increasingly difficult.
Daylight
The average length of the day in September in Isles of Scilly is 12h and 37min.On the first day of the month, sunrise is at 6:40 am and sunset at 8:10 pm. On the last day of September, in Isles of Scilly, sunrise is at 7:23 am and sunset at 7:07 pm BST.
Sunshine
In Isles of Scilly, the average sunshine in September is 7.2h.UV index
In Isles of Scilly, the average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a medium health hazard from unprotected exposure to Sun's UV rays for the average person.Note: In September, a regular UV index of 4 translates into these guidelines:
Put precautions into practice - Guidance to elude sunburn is provided. Direct exposure to the Sun's intense radiation around midday should be avoided for health reasons. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim.
FAQ
What is the usual temperature for Isles of Scilly in September?
What is the average humidity in September in Isles of Scilly?
How much does it rain in Isles of Scilly in September?
When it does not snow in Isles of Scilly?
Does it snow in Isles of Scilly in September?
How cold is the water in September in Isles of Scilly?
What is the average length of the day in September in Isles of Scilly?
When are sunrise and sunset in September in Isles of Scilly?
How long on average sun shines in September in Isles of Scilly?
How high is the UV index in September in Isles of Scilly?
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).
Isles of Scilly, United Kingdom
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