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.

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• January
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For a detailed overview over the year and the best time to visit Ireland, check out our Shannon's climate page.

Shannon Temperature in September

Min Temperature 10°C (50°F)  

Max Temperature 18°C (64°F)  

Chance of Rain 61%  

Precipitation 86 mm (3.4 in)  

Rainy days 18 days  

Humidity 70% *  

Sunshine 116 hours *  

Percentage Sunshine *  

* Data from: Limerick, Ireland (18 KM, 11 Miles).

What to Wear in Shannon in September

For Shannon in September, you'll want flexible clothing. It's wise to pack cotton shirts, comfortable shorts, and a pair of jeans for cooler evenings. A light sweater or jacket is useful for air-conditioned spaces (like buses) or unexpected cool moments. High rain levels are expected, so pack waterproof gear and an umbrella or poncho. Sunglasses could come in handy during the sunnier parts of your trip.

What To Do in Shannon in September

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Swimming

6/10

Cycling

6/10

Walking

6/10

Camping

8/10

Outdoor sports

9/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit Ireland, check out our Shannon's climate page.

More climate data for Shannon

Temperature Rainfall Sunshine Humidity

See the full Shannon climate overview or explore weather in Ireland.