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 start of September sees the average high-temperature at a mild 15.1°C (59.2°F), showing little difference from August's 16.6°C (61.9°F). A modest nighttime temperature average of 11.7°C (53.1°F) characterizes September in Caernarfon.Humidity
In September, the average relative humidity is 85%.Rainfall
In September, in Caernarfon, the rain falls for 19 days. Throughout September, 56mm (2.2") of precipitation is accumulated. Throughout the year, there are 236.8 rainfall days, and 754mm (29.69") of precipitation is accumulated.Snowfall
In Caernarfon, snow does not fall in May through October.Daylight
In September, the average length of the day is 12h and 40min.On the first day of the month, sunrise is at 6:27 am and sunset at 8:05 pm. On the last day of September, in Caernarfon, sunrise is at 7:17 am and sunset at 6:55 pm BST.
Sunshine
In September, the average sunshine in Caernarfon is 6.2h.UV index
May through September, with an average maximum UV index of 4, are months with the highest UV index in Caernarfon, United Kingdom. A UV Index of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV radiation for average individuals.Note: The UV index of 4 during September leads to these advisories:
Safety measures are advised. Light-skinned individuals may experience burns in under half an hour. The Sun is at its harshest during midday; protect yourself by staying in shaded areas and minimizing exposure. Shield yourself from the harmful effects of UV radiation with sun-protective attire, a hat, and quality sunglasses.
Frequently asked questions
What is the average September temperature in Caernarfon?
What is the average humidity in September in Caernarfon?
How many days does it rain in September in Caernarfon?
When it does not snow in Caernarfon?
What is the average length of the day in September in Caernarfon?
When are sunrise and sunset in September in Caernarfon?
How many hours of sunshine does Caernarfon have in September?
What are the months with the highest UV index in Caernarfon?
What is the UV index reading in September in Caernarfon?
Average temperature in September
Caernarfon, United Kingdom
- Average high temperature in September: 15.1°C
The warmest month (with the highest average high temperature) is July (16.7°C).
The month with the lowest average high temperature is February (7°C).
- Average low temperature in September: 11.7°C
The month with the highest average low temperature is August (13.2°C).
The coldest month (with the lowest average low temperature) is February (4.3°C).
Average pressure in September
Caernarfon, United Kingdom
- Average pressure in September: 1015.7mbar
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
Caernarfon, United Kingdom
- Average wind speed in September: 18.7km/h
The windiest month (with the highest average wind speed) is December (25.3km/h).
The calmest month (with the lowest average wind speed) is June (15.1km/h).
Average humidity in September
Caernarfon, United Kingdom
- Average humidity in September: 85%
The month with the highest relative humidity is August (86%).
The month with the lowest relative humidity is April (81%).
Average rainfall in September
Caernarfon, United Kingdom
- Average rainfall in September: 56mm
The wettest month (with the highest rainfall) is November (87mm).
The driest month (with the least rainfall) is May (37mm).
Average rainfall days in September
Caernarfon, United Kingdom
- Average rainfall days in September: 19 days
The month with the highest number of rainy days is August (23.6 days).
The month with the least rainy days is April (16.3 days).
Average snowfall in September
Caernarfon, United Kingdom
- Average snowfall in September: 0mm
The month with the highest snowfall is February (19mm).
The months with the least snowfall are May, June, July, August, September and October (0mm).
Average snowfall days in September
Caernarfon, United Kingdom
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (2.9 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
Caernarfon, United Kingdom
- Average daylight in September: 12h and 4min
The month with the longest days is June (Average daylight: 16h and 54min).
The month with the shortest days is December (Average daylight: 7h and 36min).
- Average sunshine in September: 6h and 1min
The month with the most sunshine is May (Average sunshine: 7h and 54min).
The month with the least sunshine is December (Average sunshine: 3h and 24min).
Average sunshine days in September
Caernarfon, United Kingdom
- Average sunshine days in September: 7.7 days
The month with the most sunshine days is April (11.4 days).
The month with the least sunshine days is December (4.2 days).
Average UV index in September
Caernarfon, United Kingdom
- Average UV index in September: 4
The months with the highest UV index are May, June, July, August and September (UV index 4).
The months with the lowest UV index are January, February, March, November and December (UV index 2).
Average cloud cover in September
Caernarfon, United Kingdom
- Average cloud cover in September: 56
The month with the most cloud cover is December (Cloud cover 68).
The month with the least cloud cover is May (Cloud cover 49).
Average visibility in September
Caernarfon, United Kingdom
- Average visibility in September: 10km
The months with the highest visibility are September and October (10km).
The months with the lowest visibility are January, February, March, April, May, June, July, August, November and December (9km).
Caernarfon, United Kingdom
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