September weather forecast
Galway, Ireland

The arrival of September ushers in the beginnings of autumn in Galway, Ireland. Although daylight hours continue to shorten, the sea retains its warmth from the summer, with temperatures around 14.8°C (58.6°F). The gradual descent of high temperatures and a slight rise in rainfall signifies the summer-to-fall period of this beautiful city.

Temperature

The transition into September in Galway reveals an average high-temperature of a still refreshing 17.3°C (63.1°F), mirroring a close resemblance to August. During the month of September, Galway's nighttime temperature lowers to an average of 10.4°C (50.7°F).

Rainfall

In Galway, during September, the rain falls for 20 days and regularly aggregates up to 93mm (3.66") of precipitation. Throughout the year, in Galway, there are 232 rainfall days, and 1156mm (45.51") of precipitation is accumulated.

Sea temperature

In September, the average sea temperature is 14.8°C (58.6°F).
Note: Engaging in a swim in 14.8°C (58.6°F) can threaten life. Brief exposure to 13°C (55.4°F) waters is uneasy, and submersion below 10°C (50°F) can lead to cold shock and disrupted breathing patterns, varying by individual.

Daylight

In September, the average length of the day in Galway is 12h and 40min.
On the first day of September in Galway, sunrise is at 6:46 am and sunset at 8:25 pm. On the last day of the month, sunrise is at 7:37 am and sunset at 7:15 pm IST.

Sunshine

In September, the average sunshine is 3h.

UV index

The average daily maximum UV index in September in Galway is 4. A UV Index of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV radiation for the average person.
Note: In September, the maximum UV index of 4 suggests this advice:
Exercise caution. The susceptibility of light skin individuals to burns is less than 30 minutes. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Select sunglasses that boast both UVA and UVB protection to limit the adverse effects of the sun on the eyes.