September weather forecastSmerwick, Ireland
September
Weather in September
September, the first month of the autumn in Smerwick, is also a moderate month, with an average temperature varying between 12.8°C (55°F) and 15.4°C (59.7°F).Temperature
Smerwick marks the onset of September with an average high-temperature of a moderate 15.4°C (59.7°F), subtly divergent from August's 16°C (60.8°F). Smerwick maintains a near steady average temperature of 12.8°C (55°F) during the nights of September, demonstrating little drop from daytime highs.Humidity
The average relative humidity in September is 84%.Rainfall
In Smerwick, in September, during 20.2 rainfall days, 63mm (2.48") of precipitation is typically accumulated. In Smerwick, during the entire year, the rain falls for 249.8 days and collects up to 968mm (38.11") of precipitation.Snowfall
January, April through November are months without snowfall.Daylight
The average length of the day in September is 12h and 39min.On the first day of September, sunrise is at 6:54 am and sunset at 8:28 pm. On the last day of the month, sunrise is at 7:42 am and sunset at 7:20 pm IST.
Sunshine
The average sunshine in September is 6.2h.UV index
May through September, with an average maximum UV index of 4, are months with the highest UV index. A UV Index value of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV rays for ordinary individuals.Note: The UV index of 4 during September translates into the following guidance:
Undertake precautions - Guarding against sun damage is counselled. During midday, the Sun's radiation is strongest, and it's advisable to reduce direct exposure. Counter UV radiation's ill effects with clothing designed for sun safety and UV-resistant eyewear.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Smerwick, Ireland
- Average high temperature in September: 15.4°C
The warmest month (with the highest average high temperature) is July (16.1°C).
The month with the lowest average high temperature is February (9°C).
- Average low temperature in September: 12.8°C
The month with the highest average low temperature is July (13.7°C).
The coldest month (with the lowest average low temperature) is February (6.7°C).
Average pressure in September
Smerwick, Ireland
- Average pressure in September: 1015.6mbar
The month with the highest atmospheric pressure is May (1016.1mbar).
The month with the lowest atmospheric pressure is November (1008.5mbar).
Average wind speed in September
Smerwick, Ireland
- Average wind speed in September: 23.1km/h
The windiest month (with the highest average wind speed) is December (31.3km/h).
The calmest month (with the lowest average wind speed) is July (19.8km/h).
Average humidity in September
Smerwick, Ireland
- Average humidity in September: 84%
The month with the highest relative humidity is July (85%).
The months with the lowest relative humidity are February, March, April and November (80%).
Average rainfall in September
Smerwick, Ireland
- Average rainfall in September: 63mm
The wettest month (with the highest rainfall) is December (114mm).
The driest month (with the least rainfall) is June (53mm).
Average rainfall days in September
Smerwick, Ireland
- Average rainfall days in September: 20.2 days
The month with the highest number of rainy days is January (23.4 days).
The month with the least rainy days is April (17.1 days).
Average snowfall in September
Smerwick, Ireland
- Average snowfall in September: 0mm
The month with the highest snowfall is December (6mm).
The months with the least snowfall are January, April, May, June, July, August, September, October and November (0mm).
Average snowfall days in September
Smerwick, Ireland
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is December (0.5 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
Smerwick, Ireland
- Average daylight in September: 12h and 42min
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: 6h and 12min
The month with the most sunshine is June (Average sunshine: 8h and 12min).
The months with the least sunshine are January and December (Average sunshine: 3h and 42min).
Average sunshine days in September
Smerwick, Ireland
- Average sunshine days in September: 7.9 days
The month with the most sunshine days is April (9.8 days).
The month with the least sunshine days is November (4.7 days).
Average UV index in September
Smerwick, Ireland
- 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 February and November (UV index 2).
Average cloud cover in September
Smerwick, Ireland
- Average cloud cover in September: 56
The month with the most cloud cover is December (Cloud cover 65).
The month with the least cloud cover is April (Cloud cover 52).
Average visibility in September
Smerwick, Ireland
- Average visibility in September: 10km
The months with the highest visibility are March, April, June and September (10km).
The months with the lowest visibility are January, February, May, July, August, October, November and December (9km).
