September weather forecast
Clifden, Ireland

Weather in September

The first month of the autumn, September, is also an enjoyable month in Clifden, Ireland, with an average temperature varying between 10°C (50°F) and 16°C (60.8°F).

Temperature

In September, the average high-temperature is practically the same as in August - a still enjoyable 16°C (60.8°F). The average low-temperature, in September, is 10°C (50°F).

Rainfall

In Clifden, during 21 rainfall days, 116mm (4.57") of precipitation is typically accumulated. Throughout the year, there are 248 rainfall days, and 1202mm (47.32") of precipitation is accumulated.

Sea temperature

In September, the average sea temperature in Clifden is 14.8°C (58.6°F).
Note: Swimming in 14.8°C (58.6°F) is considered dangerous. Unprotected immersion in temperatures below 10°C (50°F) causes quickly maximum intensity cold shock with hyperventilation.

Daylight

The average length of the day in September is 12h and 41min.
On the first day of the month, sunrise is at 6:49 am and sunset at 8:30 pm. On the last day of September, sunrise is at 7:40 am and sunset at 7:19 pm IST.

Sunshine

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

UV index

In September, the average daily maximum UV index is 4. A UV Index estimate of 3 to 5 represents a medium vulnerability from unsafe exposure to UV radiation for the average person.
Note: The daily maximum UV index of 4 in September interpret into the following advice:
Take precautions - Protection against sun damage is advised. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. 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. Tightly woven, loose-fitting clothes provide additional protection from the Sun.
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FAQ

What is the temperature in September in Clifden?

In September, the average high-temperature is 16°C (60.8°F), and the average low-temperature is 10°C (50°F).

How many days does it rain in September in Clifden?

In September, in Clifden, Ireland, the rain falls for 21 days. Throughout September, 116mm (4.57") of precipitation is accumulated.

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

When is the sunrise / sunset in September in Clifden?

On the first day of September in Clifden, Ireland, sunrise is at 6:49 am and sunset at 8:30 pm. On the last day of the month, sunrise is at 7:40 am and sunset at 7:19 pm IST.

How long on average sun shines in September in Clifden?

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

What is the UV index reading in September in Clifden?

The average daily maximum UV index in September in Clifden, Ireland, is 4. A UV Index reading of 3 to 5 represents a medium hazard to health from unprotected exposure to UV radiation.
Average rainfall days
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 41min

The month with the longest days is June (Average daylight: 16h and 56min).
The month with the shortest days is December (Average daylight: 7h and 35min).

  • 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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