Castlebar Weather in August
August in Castlebar brings pleasant temperatures, with daytime highs of 19°C (66°F) and nights around 12°C (54°F). Quite a bit of rainfall is expected, around 107 mm (4.2 in), so pack an umbrella.
Rainfall in Castlebar in August
Climate statistics over the past 30 years suggest around 20 days of rain, with 107 mm (4.2 in) average for the month. Wet weather is a regular and significant part of this month. Frequent days of rain combined with high totals means proper waterproofs are worth packing.
Temperature in Castlebar in August
In August, Castlebar gets pleasant temperatures, with highs of 19°C (66°F). Nights cool to around 12°C (54°F). The month of August belongs to the summer season. Temperatures can feel cooler in the morning and evening, so layering is often the best approach. Nights cool down to 12°C (54°F), so a light jacket or extra layer is useful once the sun goes down. On the plus side, the cooler nights make for comfortable sleeping conditions. On average, it sees the highest temps of the year.
Sunshine in Castlebar in August
The month experiences a moderate amount of sunlight, with 118 hours of sunshine. This provides a nice balance between sunshine and clouds.Should you favor a climate that's both dry and comfortably warm, June 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.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Ireland, check out our Castlebar's climate page.
Castlebar Temperature in August
Min Temperature
12°C (54°F)
Max Temperature
19°C (66°F)
Chance of Rain
68%
Precipitation
107 mm (4.2 in)
Rainy days
20 days
Humidity
81% *
Sunshine
118 hours *
Percentage Sunshine
30% *
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Castlebar typically stay consistent throughout August, with daily highs averaging around 19°C (66°F). Nights are cool, with lows around 11°C (52°F).
Average temperatures in August
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in August
Historical weather for Castlebar in August
Browse day-by-day weather records for Castlebar spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Castlebar historical weather extremes in August
The extremes listed below come from historical weather data collected in Castlebar from 1976 through 2025.
- The warmest day in August was on August 8, 2003, with a maximum of 28°C (82°F).
- The lowest daytime temperature in August was 12°C (54°F), recorded on August 25, 1986.
- Castlebar registered its coldest August night on August 24, 1980, with temperatures dropping to 4°C (39°F).
- The wettest August day on record brought 33 mm (1.3 in) of precipitation to Castlebar (August 6, 1986).
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
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What to Wear in Castlebar 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. Sunglasses could come in handy during the sunnier parts of your trip.What To Do in Castlebar in August
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Ireland, check out our Castlebar's climate page.
Temperature Rainfall Sunshine Humidity
See the full Castlebar climate overview or explore weather in Ireland.
