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Donegal Weather in August
August in Donegal brings pleasant temperatures around 18°C (64°F) during the day, dropping to 11°C (52°F) at night, with quite a bit of rainfall expected, averaging around 124 mm (4.9 in) for the month.
Rainfall in Donegal in August
Looking at the last 30 years, the data shows about 21 days with rain, averaging 124 mm (4.9 in) for the month. This is a wet month with frequent and often heavy showers. Both the number of rain days and the total rainfall are high.
Temperature in Donegal in August
Expect highs of 18°C (64°F) in Donegal in August, with nights dropping to around 11°C (52°F). August is a notable month of the summer season. Temperatures can feel cooler in the morning and evening, so layering is often the best approach. With lows of 11°C (52°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 Donegal in August
The area enjoys a balanced 140 hours of sunlight, ensuring it's neither too overcast nor too sunny.If you're inclined towards comfortable temperatures and drier conditions, August is a good time to visit Donegal.
Donegal Temperature in August
Min Temperature
11°C (52°F)
Max Temperature
18°C (64°F)
Chance of Rain
69%
Precipitation
124 mm (4.9 in)
Rainy days
21 days
Sunshine
140 hours *
Percentage Sunshine
*
* Data from: Derry, Ireland (63 KM, 39 Miles).
Donegal Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Donegal - and find the best time to visit.
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Donegal typically stay consistent throughout August, with daily highs averaging around 18°C (64°F). Nights are cool, with lows typically ranging from 10°C (50°F) to 12°C (54°F).
Average temperatures in August
Historical weather records for Donegal in August
Browse day-by-day weather records for Donegal spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Donegal historical weather extremes in August
The extremes listed below come from historical weather data collected in Donegal from 1976 through 2026.
- Donegal recorded its highest August temperature of 28°C (82°F) on August 2, 1995.
- The lowest daytime temperature in August was 11°C (52°F), recorded on August 30, 1992.
- Nighttime temperatures dropped to 3°C (37°F) on August 24, 1986, marking the coldest August night on record.
Best Places in Ireland in August
Find out more about the weather in Ireland and which places have the best travel conditions in this month. See all of Ireland in August →
perfect weather
pleasant
tolerable
unpleasant
poor
Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).
What to Wear in Donegal in August
Pleasant temperatures in August mean you can pack light but flexibel pieces. Think cotton t-shirts, comfortable walking shorts, and one warmer layer for evenings. A light sweater or denim jacket works well. Prepare for significant rainfall with proper waterproof clothing and shoes. Bring sunglasses since you'll have some sunny periods throughout the month
What To Do in Donegal in August
We rated the following activities from 1 (least suitable) to 10 (best) to do.
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Swimming6/10 -
Cycling9/10 -
Walking9/10 -
Camping6/10 -
Outdoor sports9/10
Donegal 3-Day Forecast
More climate data for Donegal
See the full Donegal climate overview or explore weather in Ireland.
Popular in August
Where to go in August - average daytime high across popular destinations.
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