September weather forecastKnocknahur, Ireland
September weather for Knocknahur, Ireland: The first month of the autumn, September, is also a moderate month in Knocknahur, Ireland, with an average temperature fluctuating between 10.4°C (50.7°F) and 14.7°C (58.5°F). In Knocknahur, Ireland, in September, during 18.6 rainfall days, 38mm (1.5") of precipitation is typically accumulated.
September
Weather in September
The first month of the autumn, September, is also a moderate month in Knocknahur, Ireland, with an average temperature fluctuating between 10.4°C (50.7°F) and 14.7°C (58.5°F).Temperature
The onset of September brings an average high-temperature of a still refreshing 14.7°C (58.5°F), nearly matching the August temperature. A consistent average low-temperature of 10.4°C (50.7°F), with a minor variance from the daytime highs, is noted in Knocknahur during the nights of September.Humidity
In Knocknahur, Ireland, the average relative humidity in September is 86%.Rainfall
In Knocknahur, in September, during 18.6 rainfall days, 38mm (1.5") of precipitation is typically accumulated. In Knocknahur, during the entire year, the rain falls for 232.9 days and collects up to 592mm (23.31") of precipitation.Snowfall
In Knocknahur, snow does not fall in April through November.Daylight
In Knocknahur, the average length of the day in September is 12h and 42min.On the first day of September, sunrise is at 6:43 am and sunset at 8:24 pm. On the last day of the month, sunrise is at 7:35 am and sunset at 7:12 pm IST.
Sunshine
The average sunshine in September in Knocknahur is 5.2h.UV index
The average daily maximum UV index in September in Knocknahur is 3. A UV Index reading of 3 to 5 represents a medium health hazard from exposure to the Sun's UV radiation for ordinary individuals.Note: The daily maximum UV index of 3 in September interprets into the following advice:
Be vigilant - A duty to shield skin and eyes from injury exists. For health reasons, it's advisable to reduce direct sun exposure during peak hours around midday. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure.
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Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Knocknahur, Ireland
- Average high temperature in September: 14.7°C
The warmest month (with the highest average high temperature) is July (16.3°C).
The month with the lowest average high temperature is January (7.1°C).
- Average low temperature in September: 10.4°C
The month with the highest average low temperature is July (11.7°C).
The coldest month (with the lowest average low temperature) is February (3.7°C).
Average pressure in September
Knocknahur, Ireland
- Average pressure in September: 1014.1mbar
The month with the highest atmospheric pressure is May (1015.3mbar).
The month with the lowest atmospheric pressure is November (1007mbar).
Average wind speed in September
Knocknahur, Ireland
- Average wind speed in September: 18km/h
The windiest month (with the highest average wind speed) is January (24.3km/h).
The calmest month (with the lowest average wind speed) is July (14.8km/h).
Average humidity in September
Knocknahur, Ireland
- Average humidity in September: 86%
The months with the highest relative humidity are July and August (87%).
The month with the lowest relative humidity is April (82%).
Average rainfall in September
Knocknahur, Ireland
- Average rainfall in September: 38mm
The wettest month (with the highest rainfall) is August (72mm).
The driest month (with the least rainfall) is April (27mm).
Average rainfall days in September
Knocknahur, Ireland
- Average rainfall days in September: 18.6 days
The month with the highest number of rainy days is August (22.8 days).
The month with the least rainy days is April (16.5 days).
Average snowfall in September
Knocknahur, Ireland
- Average snowfall in September: 0mm
The month with the highest snowfall is February (23mm).
The months with the least snowfall are April, May, June, July, August, September, October and November (0mm).
Average snowfall days in September
Knocknahur, Ireland
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (2 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
Knocknahur, Ireland
- Average daylight in September: 12h and 42min
The month with the longest days is June (Average daylight: 17h and 6min).
The month with the shortest days is December (Average daylight: 7h and 24min).
- Average sunshine in September: 5h and 12min
The month with the most sunshine is June (Average sunshine: 7h and 24min).
The month with the least sunshine is January (Average sunshine: 3h and 30min).
Average sunshine days in September
Knocknahur, Ireland
- Average sunshine days in September: 7.5 days
The month with the most sunshine days is May (10.1 days).
The month with the least sunshine days is August (4.3 days).
Average UV index in September
Knocknahur, Ireland
- Average UV index in September: 3
The months with the highest UV index are May and June (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
Knocknahur, Ireland
- Average cloud cover in September: 63
The month with the most cloud cover is August (Cloud cover 67).
The month with the least cloud cover is April (Cloud cover 57).
Average visibility in September
Knocknahur, Ireland
- 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).
