Belfast Weather in August

August in Belfast sees daytime temperatures around 19°C (66°F) and lows of 12°C (54°F) at night. With around 92 mm (3.6 in) of rainfall expected, it's worth packing a rain jacket.

Rainfall in Belfast in August

You can expect rain on roughly 17 days based on historical data, averaging 92 mm (3.6 in) for the month. The rainfall pattern this month is fairly balanced. Showers tend to be moderate rather than extreme.

Temperature in Belfast in August

If you're visiting Belfast in August, expect highs of 19°C (66°F) and overnight lows around 12°C (54°F). During August, you'll experience the summer season. Conditions are often most pleasant around the middle of the day. At 12°C (54°F) overnight, it can feel quite a bit cooler after dark. Worth packing something warmer for evenings, but the cooler temperatures are ideal for sleeping. On average, it sees the highest temps of the year.

Sunshine in Belfast in August

The month brings about 139 hours of sunlight, offering a comfortable mix of sun and overcast.

Wind Speed in Belfast in August

August sees wind speeds averaging 4 m/s (8 knots). You'll experience variable conditions with moderate winds that create small waves on water and keep branches moving. Conditions range from light winds to moderate breezes throughout the month.

Average water temperature in August

With water at 13°C (55°F), it's on the cooler side. Keen swimmers won't be put off, but those who prefer warm water may find it less enjoyable.

Our weather planner can help you find worldwide destinations with pleasant weather during this period. July and August typically offer the best weather for Belfast.