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 arrival of September sees a recorded average high-temperature of a still refreshing 16.1°C (61°F), showing little divergence from the previous month's conditions. Merthyr Tydfil, in September, experiences an average temperature of 9.5°C (49.1°F) at night.Humidity
The average relative humidity in September is 87%.Rainfall
May and September are months with the least rain in Merthyr Tydfil when the rain falls for 12.7 days and typically aggregates up to 32mm (1.26") of rain.Snowfall
June through October are months without snowfall.Daylight
The average length of the day in September is 12h and 38min.On the first day of September, sunrise is at 6:26 am and sunset at 8:00 pm. On the last day of the month, sunrise is at 7:13 am and sunset at 6:53 pm BST.
Sunshine
The average sunshine in September is 6.3h.UV index
In Merthyr Tydfil, United Kingdom, the average daily maximum UV index in September is 3. A UV Index reading of 3 to 5 represents a moderate health risk from exposure to the Sun's UV rays for ordinary individuals.Note: An average maximum UV index of 3 in September leads to these recommendations:
Make use of precautions - It is urged to ward off sun damage. Midday Sun has the strongest UV rays, making it crucial to limit exposure and find shade. On days when the sun blazes, arm yourself with sunglasses that block UVA and UVB radiation.
Frequently asked questions
What is the usual temperature for Merthyr Tydfil in September?
What is the average humidity in September in Merthyr Tydfil?
What is the driest month in Merthyr Tydfil?
How much does it rain in Merthyr Tydfil in September?
When it does not snow in Merthyr Tydfil?
How many hours of daylight does Merthyr Tydfil have in September?
When is the sunrise / sunset in September in Merthyr Tydfil?
How long on average sun shines in September in Merthyr Tydfil?
What is the UV index intensity in September in Merthyr Tydfil?
Average temperature in September
Merthyr Tydfil, United Kingdom
- Average high temperature in September: 16.1°C
The warmest month (with the highest average high temperature) is July (18.3°C).
The month with the lowest average high temperature is January (6.2°C).
- Average low temperature in September: 9.5°C
The months with the highest average low temperature are July and August (11.3°C).
The coldest month (with the lowest average low temperature) is February (2°C).
Average pressure in September
Merthyr Tydfil, United Kingdom
- Average pressure in September: 1016.6mbar
The months with the highest atmospheric pressure are May and September (1016.6mbar).
The month with the lowest atmospheric pressure is November (1009.8mbar).
Average wind speed in September
Merthyr Tydfil, United Kingdom
- Average wind speed in September: 14.5km/h
The windiest month (with the highest average wind speed) is February (20.3km/h).
The calmest month (with the lowest average wind speed) is June (13.7km/h).
Average humidity in September
Merthyr Tydfil, United Kingdom
- Average humidity in September: 87%
The months with the highest relative humidity are November and December (90%).
The month with the lowest relative humidity is April (83%).
Average rainfall in September
Merthyr Tydfil, United Kingdom
- Average rainfall in September: 32mm
The wettest month (with the highest rainfall) is November (74mm).
The driest months (with the least rainfall) are May and September (32mm).
Average rainfall days in September
Merthyr Tydfil, United Kingdom
- Average rainfall days in September: 12.7 days
The month with the highest number of rainy days is November (18.7 days).
The month with the least rainy days is September (12.7 days).
Average snowfall in September
Merthyr Tydfil, United Kingdom
- Average snowfall in September: 0mm
The month with the highest snowfall is January (32mm).
The months with the least snowfall are June, July, August, September and October (0mm).
Average snowfall days in September
Merthyr Tydfil, United Kingdom
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (4.3 days).
The months with the least snowfall days are June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Merthyr Tydfil, 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 2min
The months with the most sunshine are May and July (Average sunshine: 7h and 18min).
The month with the least sunshine is November (Average sunshine: 3h and 24min).
Average sunshine days in September
Merthyr Tydfil, United Kingdom
- Average sunshine days in September: 13.8 days
The month with the most sunshine days is September (13.8 days).
The month with the least sunshine days is November (8.2 days).
Average UV index in September
Merthyr Tydfil, 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, November and December (UV index 2).
Average cloud cover in September
Merthyr Tydfil, United Kingdom
- Average cloud cover in September: 57
The month with the most cloud cover is November (Cloud cover 67).
The month with the least cloud cover is April (Cloud cover 52).
Average visibility in September
Merthyr Tydfil, United Kingdom
- Average visibility in September: 8km
The months with the highest visibility are January, February, March, April, May, June and December (9km).
The months with the lowest visibility are July, August, September, October and November (8km).
Merthyr Tydfil, United Kingdom
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