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 sea temperature 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
An average high-temperature of a still refreshing 15.8°C (60.4°F) marks September, exhibiting a close resemblance to the conditions in August. During the month of September, the temperature generally drops to a low average of 9.3°C (48.7°F).Humidity
In Shannon, the average relative humidity in September is 88%.Rainfall
The month with the least rainfall in Shannon is September, when the rain falls for 14.9 days and typically collects 33mm (1.3") of precipitation.Snowfall
April through November are months without snowfall.Sea temperature
In September, the average sea temperature in Shannon is 15.2°C (59.4°F).Note: For most individuals, swimming in 15.2°C (59.4°F) is not a pleasurable activity. Breathing becomes progressively more difficult as water temperature declines below 21°C (69.8°F).
Daylight
In September, the average length of the day in Shannon is 12h and 40min.On the first day of the month, sunrise is at 6:47 am and sunset at 8:23 pm. On the last day of September, in Shannon, sunrise is at 7:36 am and sunset at 7:14 pm IST.
Sunshine
In Shannon, the average sunshine in September is 5.6h.UV index
In Shannon, the average daily maximum UV index in September is 3. A UV Index estimate of 3 to 5 represents a moderate threat to health from unprotected exposure to Sun's UV rays for ordinary individuals.Note: The maximum daily UV index of 3 during September translates into the following directions:
Adopt protective measures - Requirement to safeguard skin and eyes from harm exists. Sun's radiation is most powerful around mid-day, so it's best to limit outdoor activities during this time. Shield yourself from the harmful effects of UV radiation with sun-protective attire, a hat, and quality sunglasses.
Frequently asked questions
What are the temperatures in Shannon in September?
What is the average humidity in September in Shannon?
What is the driest month in Shannon?
How much does it rain in Shannon in September?
When it does not snow in Shannon?
How cold is the water in September in Shannon?
How many hours of daylight does Shannon have in September?
When are sunrise and sunset in September in Shannon?
How many hours of sunshine does Shannon have in September?
What is the UV index reading in September in Shannon?
Average temperature in September
Shannon, Ireland
- Average high temperature in September: 15.8°C
The warmest month (with the highest average high temperature) is July (18°C).
The month with the lowest average high temperature is January (7.8°C).
- Average low temperature in September: 9.3°C
The month with the highest average low temperature is July (11.1°C).
The coldest months (with the lowest average low temperature) are February and March (2.9°C).
Average pressure in September
Shannon, Ireland
- Average pressure in September: 1015.4mbar
The month with the highest atmospheric pressure is May (1016mbar).
The month with the lowest atmospheric pressure is November (1008.3mbar).
Average wind speed in September
Shannon, Ireland
- Average wind speed in September: 14.5km/h
The windiest month (with the highest average wind speed) is February (19km/h).
The calmest month (with the lowest average wind speed) is July (13.3km/h).
Average humidity in September
Shannon, Ireland
- Average humidity in September: 88%
The months with the highest relative humidity are November and December (90%).
The month with the lowest relative humidity is April (84%).
Average rainfall in September
Shannon, Ireland
- Average rainfall in September: 33mm
The wettest month (with the highest rainfall) is December (56mm).
The driest month (with the least rainfall) is September (33mm).
Average rainfall days in September
Shannon, Ireland
- Average rainfall days in September: 14.9 days
The month with the highest number of rainy days is August (20.4 days).
The month with the least rainy days is February (14.8 days).
Average snowfall in September
Shannon, Ireland
- Average snowfall in September: 0mm
The month with the highest snowfall is December (21mm).
The months with the least snowfall are April, May, June, July, August, September, October and November (0mm).
Average snowfall days in September
Shannon, Ireland
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (0.9 days).
The months with the least snowfall days are May, June, July, August, September, October and November (0 days).
Average sea temperature in September
Shannon, Ireland
- Average sea temperature in September: 15.2°C
The best month for swimming (with the highest average sea temperature) is August (15.8°C).
The coldest month (with the lowest average sea temperature) is March (9.4°C).
Average daylight in September /
Average sunshine in September
Shannon, Ireland
- Average daylight in September: 12h and 4min
The month with the longest days is June (Average daylight: 16h and 48min).
The month with the shortest days is December (Average daylight: 7h and 42min).
- Average sunshine in September: 5h and 4min
The month with the most sunshine is June (Average sunshine: 7h and 18min).
The months with the least sunshine are January and December (Average sunshine: 4h and 0min).
Average sunshine days in September
Shannon, Ireland
- Average sunshine days in September: 11.4 days
The month with the most sunshine days is December (12.6 days).
The month with the least sunshine days is July (7.6 days).
Average UV index in September
Shannon, 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
Shannon, 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
Shannon, Ireland
- Average visibility in September: 8km
The months with the highest visibility are January, February, March, April, November and December (9km).
The months with the lowest visibility are May, June, July, August, September and October (8km).
Shannon, Ireland
Weather forecast for your location
2. Allow the app to use your location
