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
Weather in September
Temperature
The introduction of September sees an average high-temperature of a still refreshing 15.4°C (59.7°F), hardly deviating from August. In September, Llanystumdwy's nights cool slightly to a consistent average temperature of 13.4°C (56.1°F).Humidity
In September, the average relative humidity is 82%.Rainfall
In September, the rain falls for 17.9 days. Throughout September, 58mm (2.28") of precipitation is accumulated. In Llanystumdwy, during the entire year, the rain falls for 222.9 days and collects up to 765mm (30.12") of precipitation.Snowfall
April through November are months without snowfall.Daylight
The average length of the day in September is 12h and 40min.On the first day of the month, sunrise is at 6:28 am and sunset at 8:05 pm. On the last day of September, in Llanystumdwy, United Kingdom, sunrise is at 7:17 am and sunset at 6:56 pm BST.
Sunshine
In September, the average sunshine in Llanystumdwy, United Kingdom, is 6.7h.UV index
The average daily maximum UV index in September in Llanystumdwy is 3. A UV Index of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV radiation for ordinary individuals.Note: In September, the maximum UV index of 3 translates into these guidelines:
Take necessary precautions - Defending against sun damage is advocated. Midday is when the Sun's radiation is strongest; avoid prolonged exposure during this time. Wearing sunglasses with both UVA and UVB protection effectively reduces sun-induced eye damage.
Frequently asked questions
What are September temperatures in Llanystumdwy?
What is the average humidity in September in Llanystumdwy?
How many days does it rain in September in Llanystumdwy?
When it does not snow in Llanystumdwy?
How many hours of daylight does Llanystumdwy have in September?
What time are sunrise and sunset in September in Llanystumdwy?
How many hours of sunshine does Llanystumdwy have in September?
What is the UV index reading in September in Llanystumdwy?
Average temperature in September
Llanystumdwy, United Kingdom
- Average high temperature in September: 15.4°C
The warmest month (with the highest average high temperature) is August (16.3°C).
The month with the lowest average high temperature is February (7.7°C).
- Average low temperature in September: 13.4°C
The month with the highest average low temperature is August (14.1°C).
The coldest month (with the lowest average low temperature) is February (5.7°C).
Average pressure in September
Llanystumdwy, United Kingdom
- Average pressure in September: 1015.8mbar
The month with the highest atmospheric pressure is May (1016.2mbar).
The month with the lowest atmospheric pressure is November (1008.9mbar).
Average wind speed in September
Llanystumdwy, United Kingdom
- Average wind speed in September: 22.6km/h
The windiest month (with the highest average wind speed) is December (30.9km/h).
The calmest month (with the lowest average wind speed) is June (18km/h).
Average humidity in September
Llanystumdwy, United Kingdom
- Average humidity in September: 82%
The months with the highest relative humidity are June, July and August (84%).
The month with the lowest relative humidity is November (79%).
Average rainfall in September
Llanystumdwy, United Kingdom
- Average rainfall in September: 58mm
The wettest month (with the highest rainfall) is November (97mm).
The driest month (with the least rainfall) is April (37mm).
Average rainfall days in September
Llanystumdwy, United Kingdom
- Average rainfall days in September: 17.9 days
The month with the highest number of rainy days is December (23.1 days).
The month with the least rainy days is April (14.5 days).
Average snowfall in September
Llanystumdwy, United Kingdom
- Average snowfall in September: 0mm
The month with the highest snowfall is February (7mm).
The months with the least snowfall are April, May, June, July, August, September, October and November (0mm).
Average snowfall days in September
Llanystumdwy, United Kingdom
- Average snowfall days in September: 0 days
The months with the highest number of snowfall days are January and February (1.1 days).
The months with the least snowfall days are April, May, June, July, August, September, October and November (0 days).
Average daylight in September /
Average sunshine in September
Llanystumdwy, United Kingdom
- Average daylight in September: 12h and 4min
The month with the longest days is June (Average daylight: 16h and 48min).
The month with the shortest days is December (Average daylight: 7h and 42min).
- Average sunshine in September: 6h and 4min
The month with the most sunshine is May (Average sunshine: 8h and 18min).
The month with the least sunshine is December (Average sunshine: 3h and 24min).
Average sunshine days in September
Llanystumdwy, United Kingdom
- Average sunshine days in September: 9.4 days
The months with the most sunshine days are April and May (13.5 days).
The month with the least sunshine days is December (4.5 days).
Average UV index in September
Llanystumdwy, United Kingdom
- Average UV index in September: 3
The months with the highest UV index are May, June, July and August (UV index 4).
The months with the lowest UV index are January, February, March and December (UV index 2).
Average cloud cover in September
Llanystumdwy, United Kingdom
- Average cloud cover in September: 54
The month with the most cloud cover is December (Cloud cover 67).
The month with the least cloud cover is May (Cloud cover 47).
Average visibility in September
Llanystumdwy, United Kingdom
- Average visibility in September: 10km
The months with the highest visibility are February, March, April, May, June, July, August, September, October, November and December (10km).
The month with the lowest visibility is January (9km).
Llanystumdwy, United Kingdom
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