Shannon Weather in September

September in Shannon averages 18°C (64°F) during the day and 10°C (50°F) at night. Quite a bit of rainfall is typical this month, with around 86 mm (3.4 in) on average. An umbrella is a good idea.

Rainfall in Shannon in September

Historically, the month has about 18 days of rain, averaging 86 mm (3.4 in) in total. Rain falls on many days this month, but usually in relatively small amounts. A light waterproof is more useful than a heavy umbrella.

Temperature in Shannon in September

Daytime temperatures in Shannon reach 18°C (64°F) in September, dropping to 10°C (50°F) at night. This creates a mild day-to-night pattern that is generally easy to manage with the right clothing. With lows of 10°C (50°F), nights are cool. If you're out after dark, an extra layer will keep you comfortable. The cooler air at night is also great for getting a good rest.

Sunshine in Shannon in September

The area enjoys a balanced 116 hours of sunlight, ensuring it's neither too overcast nor too sunny.

Should you favor a climate that's both dry and comfortably warm, July typically offers the most agreeable circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.