Our verdict
The best time to visit Donegal is May-June
In the height of summer, temperatures in Donegal can reach a maximum of 19℃ (67℉). In the colder months such as January, temperatures usually get down to an average minimum of 3℃ (37℉).
The longest days between sunrise and sunset in Donegal are usually in June, so if you want to get the most out of your daytime activities, be sure to plan your visit around this time. On average it rains the most days in December, making it the wettest month of the year. Although it’s the wet season, it can often rain a little bit during the day or evening but have fine weather for a majority of the day too, so don’t let this put you off.
For more information about when to travel to Donegal, the monthly weather breakdown and the best information and tools to book your trip, continue reading below.
Quick links: Fast facts / Seasons / Average temperatures / Monthly climate / FAQs / Map
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Donegal seasons
Before you continue, it’s important to know when the seasons are in Donegal as they might be different to yours depending on where in the world you’re travelling from. Donegal is in the Northern Hemisphere, so the seasons fall during these months:
| Season | Months |
|---|---|
| Summer | June to August |
| Autumn/fall | September to November |
| Winter | December to February |
| Spring | March to May |
Average temperatures in Donegal
If the temperature is a big factor for you to help you decide when to visit, the chart below shows the average minimum and maximum temperatures in Donegal for each month side-by-side so you can easily see the difference in weather throughout the year. To see the temperatures in both Celsius (°C) and Fahrenheit (°F), hover or tap the shaded boxes on the graph.
Donegal climate by month
If you already have a rough idea about which months you might want to travel, the section below shows a detailed breakdown of the climate in Donegal for each month so you can see if it all suits your wants and needs. Scroll down, or use the quick menu below to jump to your preferred month.
Jump to:
Donegal in January
- Average temperature: 5℃ (41℉)
- Average high temperature: 7℃ (44℉)
- Average low temperature: 3℃ (37℉)
- Average humidity: 88%
- Average sunny days: 7 days
- Average rainfall: 72mm (3") over 22 days
- Average snow days: 3 days
of pure sunshine
of showers or rain
What to pack: If you’re heading to Donegal in January, make sure you pack a thick snow/winter jacket, thermals and some extra layers as it's always very cold.
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Donegal in February
- Average temperature: 5℃ (41℉)
- Average high temperature: 7℃ (45℉)
- Average low temperature: 3℃ (37℉)
- Average humidity: 86%
- Average sunny days: 7 days
- Average rainfall: 73mm (3") over 18 days
- Average snow days: 3 days
of pure sunshine
of showers or rain
What to pack: If you’re heading to Donegal in February, make sure you pack a thick snow/winter jacket, thermals and some extra layers as it's always very cold.
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Donegal in March
- Average temperature: 6℃ (43℉)
- Average high temperature: 8℃ (47℉)
- Average low temperature: 3℃ (38℉)
- Average humidity: 84%
- Average sunny days: 8 days
- Average rainfall: 69mm (3") over 19 days
- Average snow days: 2 days
of pure sunshine
of showers or rain
What to pack: If you’re heading to Donegal in March, make sure you pack a thick snow/winter jacket, thermals and some extra layers as it's always very cold.
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Donegal in April
- Average temperature: 8℃ (47℉)
- Average high temperature: 11℃ (52℉)
- Average low temperature: 5℃ (41℉)
- Average humidity: 82%
- Average sunny days: 10 days
- Average rainfall: 34mm (1") over 18 days
of pure sunshine
of showers or rain
What to pack: If you’re heading to Donegal in April, make sure you pack a thick snow/winter jacket, thermals and some extra layers as it's always very cold.
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Donegal in May
- Average temperature: 10℃ (51℉)
- Average high temperature: 13℃ (56℉)
- Average low temperature: 7℃ (44℉)
- Average humidity: 84%
- Average sunny days: 8 days
- Average rainfall: 53mm (2") over 20 days
of pure sunshine
of showers or rain
What to pack: If you’re heading to Donegal in May, make sure you pack a warm jacket or coat.
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Donegal in June
- Average temperature: 13℃ (55℉)
- Average high temperature: 15℃ (60℉)
- Average low temperature: 9℃ (49℉)
- Average humidity: 85%
- Average sunny days: 6 days
- Average rainfall: 49mm (2") over 20 days
of pure sunshine
of showers or rain
What to pack: If you’re heading to Donegal in June, make sure you pack a warm jacket or coat.
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Donegal in July
- Average temperature: 14℃ (57℉)
- Average high temperature: 16℃ (62℉)
- Average low temperature: 11℃ (52℉)
- Average humidity: 87%
- Average sunny days: 4 days
- Average rainfall: 58mm (2") over 24 days
of pure sunshine
of showers or rain
What to pack: If you’re heading to Donegal in July, make sure you pack a warm jacket or coat.
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Donegal in August
- Average temperature: 13℃ (56℉)
- Average high temperature: 16℃ (60℉)
- Average low temperature: 11℃ (51℉)
- Average humidity: 88%
- Average sunny days: 4 days
- Average rainfall: 77mm (3") over 25 days
of pure sunshine
of showers or rain
What to pack: If you’re heading to Donegal in August, make sure you pack a warm jacket or coat.
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Donegal in September
- Average temperature: 12℃ (54℉)
- Average high temperature: 15℃ (58℉)
- Average low temperature: 10℃ (49℉)
- Average humidity: 87%
- Average sunny days: 7 days
- Average rainfall: 49mm (2") over 21 days
of pure sunshine
of showers or rain
What to pack: If you’re heading to Donegal in September, make sure you pack a warm jacket or coat.
Donegal in October
- Average temperature: 10℃ (50℉)
- Average high temperature: 12℃ (54℉)
- Average low temperature: 8℃ (46℉)
- Average humidity: 87%
- Average sunny days: 9 days
- Average rainfall: 63mm (2") over 20 days
of pure sunshine
of showers or rain
What to pack: If you’re heading to Donegal in October, make sure you pack a warm jacket or coat.
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Donegal in November
- Average temperature: 7℃ (44℉)
- Average high temperature: 9℃ (48℉)
- Average low temperature: 5℃ (41℉)
- Average humidity: 87%
- Average sunny days: 6 days
- Average rainfall: 65mm (3") over 21 days
of pure sunshine
of showers or rain
What to pack: If you’re heading to Donegal in November, make sure you pack a warm jacket or coat.
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Donegal in December
- Average temperature: 5℃ (42℉)
- Average high temperature: 7℃ (45℉)
- Average low temperature: 4℃ (39℉)
- Average humidity: 87%
- Average sunny days: 6 days
- Average rainfall: 77mm (3") over 22 days
- Average snow days: 1 days
of pure sunshine
of showers or rain
What to pack: If you’re heading to Donegal in December, make sure you pack a thick snow/winter jacket, thermals and some extra layers as it's always very cold.
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