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
September
Weather in September
Temperature
September's weather displays an average high-temperature of a still refreshing 15.3°C (59.5°F), slightly varied from August's 17°C (62.6°F). The average nighttime temperature lowers to a frosty 8.3°C (46.9°F) throughout September.Humidity
In Merthyr Cynog, United Kingdom, the average relative humidity in September is 90%.Rainfall
The month with the least rainfall in Merthyr Cynog, United Kingdom, is September, when the rain falls for 9.4 days and typically collects 13mm (0.51") of precipitation.Snowfall
May through October are months without snowfall.Daylight
The average length of the day in September in Merthyr Cynog, United Kingdom, is 12h and 39min.On the first day of the month, sunrise is at 6:26 am and sunset at 8:00 pm. On the last day of September, in Merthyr Cynog, United Kingdom, sunrise is at 7:14 am and sunset at 6:53 pm BST.
Sunshine
In Merthyr Cynog, United Kingdom, the average sunshine in September is 5.3h.UV index
In Merthyr Cynog, the average daily maximum UV index in September is 3. A UV Index reading of 3 to 5 represents a medium health hazard from exposure to the Sun's UV radiation for the ordinary person.Note: A typical high UV index of 3 in September suggests the following recommendations:
Exercise prevention - Protecting skin and eyes from harm is required. Limiting sun exposure during midday hours helps in reducing the harmful effects of UV radiation. A hat with a generous brim can prevent nearly 50% of UV rays from reaching your eyes.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are September temperatures in Merthyr Cynog?
What is the average humidity in September in Merthyr Cynog?
What is the driest month in Merthyr Cynog?
How much does it rain in Merthyr Cynog in September?
When it does not snow in Merthyr Cynog?
How many hours of daylight does Merthyr Cynog have in September?
What time are sunrise and sunset in September in Merthyr Cynog?
How long on average sun shines in September in Merthyr Cynog?
How high is the UV index in September in Merthyr Cynog?
Average temperature in September
Merthyr Cynog, United Kingdom
- Average high temperature in September: 15.3°C
The warmest month (with the highest average high temperature) is July (17.6°C).
The month with the lowest average high temperature is January (5.5°C).
- Average low temperature in September: 8.3°C
The month with the highest average low temperature is August (10.3°C).
The coldest month (with the lowest average low temperature) is January (1.1°C).
Average pressure in September
Merthyr Cynog, United Kingdom
- Average pressure in September: 1016.4mbar
The month with the highest atmospheric pressure is May (1016.5mbar).
The month with the lowest atmospheric pressure is November (1009.6mbar).
Average wind speed in September
Merthyr Cynog, United Kingdom
- Average wind speed in September: 13.5km/h
The windiest month (with the highest average wind speed) is February (19km/h).
The calmest months (with the lowest average wind speed) are June and July (12.9km/h).
Average humidity in September
Merthyr Cynog, United Kingdom
- Average humidity in September: 90%
The months with the highest relative humidity are January, November and December (92%).
The months with the lowest relative humidity are April and May (85%).
Average rainfall in September
Merthyr Cynog, United Kingdom
- Average rainfall in September: 13mm
The wettest month (with the highest rainfall) is June (37mm).
The driest month (with the least rainfall) is September (13mm).
Average rainfall days in September
Merthyr Cynog, United Kingdom
- Average rainfall days in September: 9.4 days
The month with the highest number of rainy days is July (15.4 days).
The months with the least rainy days are February and September (9.4 days).
Average snowfall in September
Merthyr Cynog, United Kingdom
- Average snowfall in September: 0mm
The month with the highest snowfall is November (21mm).
The months with the least snowfall are May, June, July, August, September and October (0mm).
Average snowfall days in September
Merthyr Cynog, United Kingdom
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (4.8 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 Cynog, United Kingdom
- Average daylight in September: 12h and 4min
The month with the longest days is June (Average daylight: 16h and 42min).
The month with the shortest days is December (Average daylight: 7h and 48min).
- Average sunshine in September: 5h and 2min
The month with the most sunshine is May (Average sunshine: 6h and 18min).
The month with the least sunshine is November (Average sunshine: 2h and 54min).
Average sunshine days in September
Merthyr Cynog, United Kingdom
- Average sunshine days in September: 16.2 days
The months with the most sunshine days are March and September (16.2 days).
The month with the least sunshine days is July (10.1 days).
Average UV index in September
Merthyr Cynog, 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 Cynog, United Kingdom
- Average cloud cover in September: 66
The month with the most cloud cover is November (Cloud cover 73).
The month with the least cloud cover is April (Cloud cover 59).
Average visibility in September
Merthyr Cynog, United Kingdom
- Average visibility in September: 7km
The months with the highest visibility are January, February, March, April, May, June, July, October, November and December (8km).
The months with the lowest visibility are August and September (7km).
