September weather forecastStraffan, Ireland
September
Weather in September
September, the first month of the autumn in Straffan, is still a mild month, with an average temperature ranging between max 15.6°C (60.1°F) and min 9°C (48.2°F).Temperature
September's advent denotes a minor fluctuation in the average high-temperature to a moderate 15.6°C (60.1°F) from August's 17.5°C (63.5°F). Nighttime temperatures in September average to a chilly 9°C (48.2°F).Humidity
In Straffan, the average relative humidity in September is 89%.Rainfall
In Straffan, in September, during 12.7 rainfall days, 20mm (0.79") of precipitation is typically accumulated. Throughout the year, in Straffan, there are 170.7 rainfall days, and 271mm (10.67") of precipitation is accumulated.Snowfall
In Straffan, snow does not fall in April through November.Daylight
In Straffan, the average length of the day in September is 12h and 41min.On the first day of the month, sunrise is at 6:37 am and sunset at 8:15 pm. On the last day of September, sunrise is at 7:27 am and sunset at 7:05 pm IST.
Sunshine
The average sunshine in September in Straffan is 5.8h.UV index
In September, the average daily maximum UV index is 3. A UV Index of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV radiation for ordinary individuals.Note: In September, a daily maximum UV index of 3 leads to the following instructions:
Take precautions - Protection against sunburn is recommended. The Sun's UV radiation is especially harmful around midday, so reduce exposure and stay safe. Always opt for UVA and UVB-resistant sunglasses on radiant days.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Straffan, Ireland
- Average high temperature in September: 15.6°C
The warmest month (with the highest average high temperature) is July (17.7°C).
The month with the lowest average high temperature is January (6.9°C).
- Average low temperature in September: 9°C
The month with the highest average low temperature is July (10.8°C).
The coldest month (with the lowest average low temperature) is January (2.2°C).
Average pressure in September
Straffan, Ireland
- Average pressure in September: 1015.2mbar
The month with the highest atmospheric pressure is May (1015.9mbar).
The month with the lowest atmospheric pressure is November (1008.2mbar).
Average wind speed in September
Straffan, Ireland
- Average wind speed in September: 14.7km/h
The windiest month (with the highest average wind speed) is January (20.3km/h).
The calmest months (with the lowest average wind speed) are June and July (13.3km/h).
Average humidity in September
Straffan, Ireland
- Average humidity in September: 89%
The month with the highest relative humidity is December (91%).
The months with the lowest relative humidity are March and April (85%).
Average rainfall in September
Straffan, Ireland
- Average rainfall in September: 20mm
The wettest month (with the highest rainfall) is August (33mm).
The driest months (with the least rainfall) are January, April and October (16mm).
Average rainfall days in September
Straffan, Ireland
- Average rainfall days in September: 12.7 days
The month with the highest number of rainy days is July (19.5 days).
The month with the least rainy days is November (10.6 days).
Average snowfall in September
Straffan, Ireland
- Average snowfall in September: 0mm
The month with the highest snowfall is January (15mm).
The months with the least snowfall are April, May, June, July, August, September, October and November (0mm).
Average snowfall days in September
Straffan, Ireland
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (2.1 days).
The months with the least snowfall days are May, June, July, August, September, October and November (0 days).
Average daylight in September /
Average sunshine in September
Straffan, Ireland
- Average daylight in September: 12h and 42min
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 48min
The month with the most sunshine is April (Average sunshine: 6h and 30min).
The month with the least sunshine is February (Average sunshine: 3h and 48min).
Average sunshine days in September
Straffan, Ireland
- Average sunshine days in September: 10.7 days
The month with the most sunshine days is November (15.8 days).
The month with the least sunshine days is July (5.8 days).
Average UV index in September
Straffan, Ireland
- Average UV index in September: 3
The months with the highest UV index are May, June 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
Straffan, Ireland
- Average cloud cover in September: 60
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
Straffan, Ireland
- Average visibility in September: 8km
The months with the highest visibility are January, February, March, April, May, October, November and December (9km).
The months with the lowest visibility are June, July, August and September (8km).
