September · typical climate, not a forecast
Donegal in September
Ireland
Workable
16°C day · 11°C night · 52% rain · 12h daylight · quiet · €1,080 estimated
Live · Donegal
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Reading…
Live · Tallinn (you)
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Cool Score breakdown
Scored for 5 nights from Tallinn in September.
- Temperature fit99
15.5°C typical high vs your 12–20°C window
w 26 - Heat escape7
0.8°C cooler than Tallinn
w 14 - Rain probability42
52% chance of rain on an average day
w 11 - Daylight hours60
12.4h of daylight mid-month
w 8 - Outdoor conditions72
Comfortable for a full day outside at 15.5°C
w 10 - Crowding73
Quiet for this month
w 8 - Flight + stay cost77
≈€1080 estimated for 5 nights vs €1000 budget
w 12 - Nature access90
9/10 — wild ground within reach
w 6 - City atmosphere46
3/10 urban texture · 7/10 food scene
w 4
Why Donegal in September
Cheap, cool and you will have the beach to yourself.
- Slieve League cliffs
- Empty surf beaches
- Glenveagh National Park
What September in Donegal is actually like
In September, Donegal sits around 16°C by day and drops to about 11°C after dark, so a light layer earns its place in the bag even in high summer. That is roughly 1°C cooler than Tallinn at the same time of year — the difference between planning your day around the shade and simply walking out of the door.
Expect rain on roughly 52% of days, usually passing rather than persistent, and about 12 hours of daylight to spend outside. Crowds are quiet this month, and a 5-night trip from Tallinn works out at around €1,080 including flights, a mid-range stay and everyday spending.
Cheap, cool and you will have the beach to yourself. Days here tend to fill up with slieve league cliffs, empty surf beaches, glenveagh national park — which is why Donegal scores 66 out of 100 for september: workable.
Other months
Compare the typical climate month by month.