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 shift from August to September is characterized by an average high-temperature of a still enjoyable 16.7°C (62.1°F), not significantly different from the 18.3°C (64.9°F) of August. September brings Merthyr Mawr a consistent average low-temperature of 11.3°C (52.3°F).Humidity
In September, the average relative humidity in Merthyr Mawr is 84%.Rainfall
In Merthyr Mawr, in September, during 15.1 rainfall days, 46mm (1.81") of precipitation is typically accumulated. In Merthyr Mawr, during the entire year, the rain falls for 197.2 days and collects up to 669mm (26.34") of precipitation.Snowfall
April through November are months without snowfall in Merthyr Mawr.Daylight
The average length of the day in September is 12h and 38min.On the first day of the month, sunrise is at 6:28 am and sunset at 8:00 pm. On the last day of September, sunrise is at 7:14 am and sunset at 6:54 pm BST.
Sunshine
In September, the average sunshine is 6.7h.UV index
May through September, with an average maximum UV index of 4, are months with the highest UV index in Merthyr Mawr. A UV Index value of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV rays for the average person.Note: In September, the maximum UV index of 4 suggests these recommendations:
Exercise caution. Those with pale skin may experience burns in less than half an hour. For health reasons, it's advisable to reduce direct sun exposure during peak hours around midday. Protect your eyes, ears, face, and neck from the Sun by wearing a wide-brimmed hat.
Frequently asked questions
What are the temperatures in Merthyr Mawr in September?
What is the average humidity in September in Merthyr Mawr?
How much does it rain in Merthyr Mawr in September?
When it does not snow in Merthyr Mawr?
What is the average length of the day in September in Merthyr Mawr?
When are sunrise and sunset in September in Merthyr Mawr?
How long on average sun shines in September in Merthyr Mawr?
When is the highest UV index in Merthyr Mawr?
What is the UV index intensity in September in Merthyr Mawr?
Average temperature in September
Merthyr Mawr, United Kingdom
- Average high temperature in September: 16.7°C
The warmest month (with the highest average high temperature) is July (18.8°C).
The month with the lowest average high temperature is January (7.5°C).
- Average low temperature in September: 11.3°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°C).
Average pressure in September
Merthyr Mawr, United Kingdom
- Average pressure in September: 1016.7mbar
The months with the highest atmospheric pressure are May and September (1016.7mbar).
The month with the lowest atmospheric pressure is November (1009.9mbar).
Average wind speed in September
Merthyr Mawr, United Kingdom
- Average wind speed in September: 16.9km/h
The windiest month (with the highest average wind speed) is December (23.1km/h).
The calmest month (with the lowest average wind speed) is June (15.5km/h).
Average humidity in September
Merthyr Mawr, United Kingdom
- Average humidity in September: 84%
The month with the highest relative humidity is December (86%).
The months with the lowest relative humidity are April and May (81%).
Average rainfall in September
Merthyr Mawr, United Kingdom
- Average rainfall in September: 46mm
The wettest month (with the highest rainfall) is November (79mm).
The driest month (with the least rainfall) is April (32mm).
Average rainfall days in September
Merthyr Mawr, United Kingdom
- Average rainfall days in September: 15.1 days
The month with the highest number of rainy days is November (19.1 days).
The month with the least rainy days is February (13.9 days).
Average snowfall in September
Merthyr Mawr, United Kingdom
- Average snowfall in September: 0mm
The month with the highest snowfall is December (9mm).
The months with the least snowfall are April, May, June, July, August, September, October and November (0mm).
Average snowfall days in September
Merthyr Mawr, United Kingdom
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (1.3 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Merthyr Mawr, United Kingdom
- Average daylight in September: 12h and 4min
The month with the longest days is June (Average daylight: 16h and 36min).
The month with the shortest days is December (Average daylight: 7h and 54min).
- Average sunshine in September: 6h and 4min
The month with the most sunshine is May (Average sunshine: 8h and 0min).
The month with the least sunshine is January (Average sunshine: 3h and 36min).
Average sunshine days in September
Merthyr Mawr, United Kingdom
- Average sunshine days in September: 11.8 days
The month with the most sunshine days is May (13.5 days).
The month with the least sunshine days is November (9 days).
Average UV index in September
Merthyr Mawr, 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, November and December (UV index 2).
Average cloud cover in September
Merthyr Mawr, United Kingdom
- Average cloud cover in September: 54
The month with the most cloud cover is November (Cloud cover 64).
The month with the least cloud cover is April (Cloud cover 48).
Average visibility in September
Merthyr Mawr, United Kingdom
- Average visibility in September: 9km
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (9km).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (9km).
Merthyr Mawr, United Kingdom
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