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 beginning of September records an average high-temperature of a still refreshing 15.5°C (59.9°F), almost echoing the conditions of the previous month. The average temperature in Lettermore drops to a chilly 9.9°C (49.8°F) during the night in the month of September.Humidity
The months with the highest humidity in Lettermore are January, July through December, with an average relative humidity of 87%.Rainfall
In Lettermore, in September, during 17.4 rainfall days, 40mm (1.57") of precipitation is typically accumulated. In Lettermore, during the entire year, the rain falls for 235.1 days and collects up to 619mm (24.37") of precipitation.Snowfall
In Lettermore, snow does not fall in April through November.Daylight
In Lettermore, Ireland, the average length of the day in September is 12h and 40min.On the first day of September in Lettermore, sunrise is at 6:49 am and sunset at 8:27 pm. On the last day of the month, sunrise is at 7:39 am and sunset at 7:17 pm IST.
Sunshine
The average sunshine in September in Lettermore is 5.4h.UV index
The average daily maximum UV index in September in Lettermore is 3. A UV Index estimate of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV radiation for ordinary individuals.Note: The UV index of 3 during September leads to these advisories:
Prioritize safety - Suggestions to prevent sun damage are offered. During midday, the Sun's radiation is strongest, and it's advisable to reduce direct exposure. Enhance your sun protection with tightly woven, yet airy clothing.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the usual temperature for Lettermore in September?
What is the most humid month in Lettermore?
What is the average humidity in September in Lettermore?
How much does it rain in Lettermore in September?
When it does not snow in Lettermore?
What is the average length of the day in September in Lettermore?
When is the sunrise / sunset in September in Lettermore?
How many hours of sunshine does Lettermore have in September?
What is the UV index intensity in September in Lettermore?
Average temperature in September
Lettermore, Ireland
- Average high temperature in September: 15.5°C
The warmest month (with the highest average high temperature) is July (17.3°C).
The month with the lowest average high temperature is January (7.9°C).
- Average low temperature in September: 9.9°C
The month with the highest average low temperature is August (11.4°C).
The coldest month (with the lowest average low temperature) is February (3.3°C).
Average pressure in September
Lettermore, Ireland
- Average pressure in September: 1014.8mbar
The month with the highest atmospheric pressure is May (1015.7mbar).
The month with the lowest atmospheric pressure is November (1007.7mbar).
Average wind speed in September
Lettermore, Ireland
- Average wind speed in September: 16.4km/h
The windiest months (with the highest average wind speed) are February and December (22.2km/h).
The calmest month (with the lowest average wind speed) is July (14.8km/h).
Average humidity in September
Lettermore, Ireland
- Average humidity in September: 87%
The months with the highest relative humidity are January, July, August, September, October, November and December (87%).
The months with the lowest relative humidity are March and April (83%).
Average rainfall in September
Lettermore, Ireland
- Average rainfall in September: 40mm
The wettest month (with the highest rainfall) is November (69mm).
The driest month (with the least rainfall) is April (36mm).
Average rainfall days in September
Lettermore, Ireland
- Average rainfall days in September: 17.4 days
The month with the highest number of rainy days is August (23.2 days).
The month with the least rainy days is April (17.3 days).
Average snowfall in September
Lettermore, Ireland
- Average snowfall in September: 0mm
The month with the highest snowfall is January (7mm).
The months with the least snowfall are April, May, June, July, August, September, October and November (0mm).
Average snowfall days in September
Lettermore, Ireland
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is March (0.9 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
Lettermore, Ireland
- 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: 5h and 2min
The month with the most sunshine is June (Average sunshine: 7h and 24min).
The month with the least sunshine is December (Average sunshine: 3h and 42min).
Average sunshine days in September
Lettermore, Ireland
- Average sunshine days in September: 7.2 days
The month with the most sunshine days is March (9.4 days).
The month with the least sunshine days is August (4.1 days).
Average UV index in September
Lettermore, Ireland
- Average UV index in September: 3
The months with the highest UV index are May, June and July (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
Lettermore, Ireland
- Average cloud cover in September: 62
The month with the most cloud cover is July (Cloud cover 67).
The month with the least cloud cover is April (Cloud cover 56).
Average visibility in September
Lettermore, Ireland
- Average visibility in September: 9km
The months with the highest visibility are January, February, March, April, May, June, August, September, October, November and December (9km).
The month with the lowest visibility is July (8km).
Lettermore, Ireland
Weather forecast for your location
2. Allow the app to use your location