September weather forecastSligo, Ireland

September

Weather in September

September is a delightful combination of lingering summer warmth and emerging autumn chill in Sligo. With slight drops in temperatures, the weather maintains a balance between comfort and chill. Although rainfall increases to 104mm (4.09"), it doesn’t diminish the city's charm as it prepares for autumn. The sea remains consistent at 14°C (57.2°F), accommodating water enthusiasts for a little longer. The UV index decreases, hinting at safer and softer sunlight.

Temperature

Sligo, Ireland, starts September with an average high-temperature of a still refreshing 16°C (60.8°F), a minor shift from August's 18°C (64.4°F). During September, Sligo sees a mean low-temperature of 8°C (46.4°F).

Rainfall

In Sligo, in September, it is raining for 21 days, with typically 104mm (4.09") of accumulated precipitation. In Sligo, Ireland, during the entire year, the rain falls for 247 days and collects up to 1260mm (49.61") of precipitation.

Sea temperature

The months with the warmest seawater in Sligo are July through September, with an average sea temperature of 14°C (57.2°F).
Note: In 14°C (57.2°F), even brief exposure to 13°C (55.4°F) feels biting, and anything less than 10°C (50°F) risks cold shock and impaired breathing, considering one's health.

Daylight

The average length of the day in September in Sligo is 12h and 42min.
On the first day of September, sunrise is at 6:42 am and sunset at 8:24 pm. On the last day of the month, sunrise is at 7:35 am and sunset at 7:12 pm IST.

Sunshine

In Sligo, the average sunshine in September is 3h.

UV index

In September, the average daily maximum UV index in Sligo is 3. A UV Index value of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV rays for ordinary individuals.
Note: A maximum high UV index of 3 in September translates into the following recommendations:
Stay alert. Light-skinned people could suffer burns in less than 30 minutes. Avoiding direct sunlight during midday hours helps reduce the risk from intense UV radiation. Boost your sun resistance with garments that are densely woven yet spacious.

Updated: Jan 27, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

The high-temperature, in September, in Sligo, records 16°C (60.8°F), while the low-temperature is 8°C (46.4°F).

In Sligo, Ireland, during September, the rain falls for 21 days and regularly aggregates up to 104mm (4.09") of precipitation.

The months with the warmest seawater are July through September, with an average sea temperature of 14°C (57.2°F).

In Sligo, Ireland, in September, the average water temperature is 14°C (57.2°F). Swimming in 14°C (57.2°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.

In September, the average day length is 12h and 42min.

In September, on the first day of the month, sunrise is at 6:42 am and sunset at 8:24 pm. On the last day of the month, in Sligo, Ireland, sunrise is at 7:35 am and sunset at 7:12 pm IST.

In September, the average sunshine duration in Sligo, Ireland, is 3h.

The average daily maximum UV index in September in Sligo, Ireland, is 3. A UV Index estimate of 3 to 5 represents a moderate health threat from exposure to the Sun's UV radiation.

Today

Tomorrow

Long-term

Year J F M A M J J A September O N D

Aug

September

Oct

Average high temperature

18°C

16°C

13°C

Average low temperature

Average rainfall

Average rainfall days

Average sea temperature

Average daylight

Average sunshine

Average UV index

Average temperature in September
Sligo, 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 and February (7°C).

Average low temperature in September: 8°C

The months with the highest average low temperature are July and August (10°C).
The coldest months (with the lowest average low temperature) are January and February (1°C).

Average rainfall in September
Sligo, Ireland

Average rainfall in September: 104.4mm

The wettest month (with the highest rainfall) is October (134.3mm).
The driest month (with the least rainfall) is April (77.9mm).

Average rainfall days in September
Sligo, Ireland

Average rainfall days in September: 21 days

The months with the highest number of rainy days are January, October and December (23 days).
The months with the least rainy days are April and June (18 days).

Average sea temperature in September
Sligo, Ireland

Average sea temperature in September: 14°C

The best months for swimming (with the highest average sea temperature) are July, August and September (14°C).
The coldest months (with the lowest average sea temperature) are February, March and April (9°C).

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

Average daylight in September: 12h and 42min

The month with the longest days is June (Average daylight: 17h and 6min).
The month with the shortest days is December (Average daylight: 7h and 24min).

Average sunshine in September: 3h

The months with the most sunshine are April, May and June (Average sunshine: 5h).
The months with the least sunshine are January and December (Average sunshine: 1h).