September weather forecast
Clifden, Ireland

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Weather in September

September marks the end of summer and the beginning of autumn in Clifden. The sea temperature begins to retreat from its peak at 15.3°C (59.5°F) in August to 14.8°C (58.6°F). The transition into autumn becomes noticeable with shorter daylight hours and gradual temperature drop. The blend of the receding summer warmth and a nip in the air marks the commencement of fall. Nature starts its colourful transition, the landscape lush from summer rains, preparing for the onset of autumn.

Temperature

The start of September in Clifden sees the average high-temperature at a still comfortable 16°C (60.8°F), showing little difference from August's 18°C (64.4°F). Throughout the month of September, Clifden sees a steady low-temperature average of 10°C (50°F).

Rainfall

In Clifden, Ireland, during September, the rain falls for 21 days and regularly aggregates up to 116mm (4.57") of precipitation. In Clifden, during the entire year, the rain falls for 248 days and collects up to 1202mm (47.32") of precipitation.

Sea temperature

In Clifden, in September, the average water temperature is 14.8°C (58.6°F).
Note: Dipping in 14.8°C (58.6°F) at temperatures less than 10°C (50°F) without proper gear can lead to pronounced cold shock and breathing difficulties.

Daylight

In Clifden, the average length of the day in September is 12h and 41min.
On the first day of September in Clifden, Ireland, sunrise is at 6:50 am and sunset at 8:29 pm. On the last day of the month, sunrise is at 7:41 am and sunset at 7:18 pm IST.

Sunshine

In September, the average sunshine in Clifden is 4h.

UV index

In Clifden, the average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV rays for the average person.
Note: The maximum daily UV index of 4 in September converts into the following recommendations:
Be vigilant - Suggestions to stave off sun damage are provided. It's recommended to limit sun exposure when its radiation is at its peak during midday. Shield yourself from the harmful effects of UV radiation with sun-protective attire, a hat, and quality sunglasses.
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Frequently asked questions

What are the temperatures in Clifden in September?

The high-temperature, in September, in Clifden, records 16°C (60.8°F), while the low-temperature is 10°C (50°F).

How many days does it rain in September in Clifden?

In Clifden, in September, it is raining for 21 days, with typically 116mm (4.57") of accumulated precipitation.

How cold is the water in September in Clifden?

In Clifden, in September, the average water temperature is 14.8°C (58.6°F). Swimming in 14.8°C (58.6°F) is considered life-threatening. Even a few minutes in 13°C (55.4°F) water is uncomfortable, and swimming below 10°C (50°F) may cause total loss of breathing control and cold shock, depending on a person's physique.

How many hours of daylight does Clifden have in September?

In September, the average day length is 12h and 41min.

When are sunrise and sunset in September in Clifden?

In September, on the first day of the month, sunrise is at 6:50 am and sunset at 8:29 pm. On the last day of the month, in Clifden, Ireland, sunrise is at 7:41 am and sunset at 7:18 pm IST.

How long on average sun shines in September in Clifden?

In September, the average sunshine duration in Clifden, Ireland, is 4h.

How high is the UV index in September in Clifden?

In September, the average daily maximum UV index in Clifden, Ireland, is 4. A UV Index value of 3 to 5 symbolizes a moderate health threat from unsafe exposure to Sun's UV rays.
Average rainfall days
Average daylight
Average sunshine
Average UV index

Average temperature in September
Clifden, Ireland

Average temperature in September - Clifden, Ireland
  • Average high temperature in September: 16°C

The warmest months (with the highest average high temperature) are July and August (18°C).
The months with the lowest average high temperature are January, February and December (9°C).

  • Average low temperature in September: 10°C

The months with the highest average low temperature are July and August (11°C).
The coldest months (with the lowest average low temperature) are January and February (3°C).

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Average rainfall in September
Clifden, Ireland

Average rainfall in September - Clifden, Ireland
  • Average rainfall in September: 116mm

The wettest month (with the highest rainfall) is January (137mm).
The driest month (with the least rainfall) is April (66mm).

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Average rainfall days in September
Clifden, Ireland

Average rainfall days in September - Clifden, Ireland
  • Average rainfall days in September: 21 days

The months with the highest number of rainy days are January, November and December (24 days).
The months with the least rainy days are April, June and July (17 days).

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Average sea temperature in September
Clifden, Ireland

Average sea temperature in September - Clifden, Ireland
  • Average sea temperature in September: 14.8°C

The best month for swimming (with the highest average sea temperature) is August (15.3°C).
The coldest month (with the lowest average sea temperature) is March (9.3°C).

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Average daylight in September /
Average sunshine in September
Clifden, Ireland

Average daylight in September / Average sunshine in September - Clifden, 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: 4h

The month with the most sunshine is May (Average sunshine: 6h).
The month with the least sunshine is December (Average sunshine: 1h).

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Average UV index in September
Clifden, Ireland

Average UV index in September - Clifden, Ireland
  • Average UV index in September: 4

The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January and December (UV index 0).

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Clifden, Ireland

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