Belfast in August
In August, Belfast averages 18°C (64°F) during the day and 12°C (54°F) at night, with frequent rain — about 17 days of the month see precipitation (100 mm total).
High seasonConditions are cool — bring a jacket for evenings. Expect daily rain or showers, often in heavy bursts.
August is one of the wetter and less comfortable months in Belfast. If your dates are flexible, consider a different time of year.
How August compares to the rest of the year in Belfast
August is one of the warmest months in Belfast (2nd of 12) and one of the wettest months (2nd of 12). Daytime temperature runs 5°C above the annual average (13°C). August runs roughly the same as July (18°C) and cools 1°C in September (16°C).
August sunrise & sunset in Belfast
Times shown for Belfast local time (Europe/London), calculated for the 15th of August. They shift by a few minutes day to day across the month.
Photography light in Belfast — August
Golden-hour and blue-hour windows for the 15th of August, in Belfast's local time. Use these for soft warm light (golden) or cool architectural twilight (blue).
📅 When to book — Belfast in August
Travel writers usually only tell you when to go. Here's when to book flights and lodging for the best mix of price and availability, based on August's tier (High season) and Belfast's popularity.
August in United Kingdom — events that affect travel
Known cultural, religious, or national events that surge prices, fill hotels, or close businesses during this month. Plan around them, or build your itinerary around the ones you'd like to see.
UK has long-weekend bank holidays in early May, late May, and late August. Many independent shops and some attractions close; popular destinations (Cotswolds, Cornwall) get busy.
Plan: Sundays + Mondays surrounding bank holidays = peak domestic travel. Book accommodation 4-6 weeks out.
Crowds & pricing — August in Belfast
This is a busy month in Belfast — not the absolute peak, but tourist numbers are clearly elevated. You'll feel it at headline attractions on weekends and in the historic centre, though side streets and lesser-known sights stay manageable. Prices are above off-season but not at their summit. A good week for first-time visitors who want everything open without the worst of the crush.
Why this tier: Northern Hemisphere summer holidays
Sun & mosquito risk — August in Belfast
UV is a clear-sky sea-level estimate — clouds, altitude, and reflective surfaces (snow, water) shift it ±30%. Mosquito risk is climate-derived only; for current disease advisories (dengue, malaria, zika) check the CDC or WHO travel pages before your trip.
Belfast in other months
| Month | Avg high | Avg low | Rainfall | Rain days | Snow days |
|---|---|---|---|---|---|
| January | 7°C / 45°F | 3°C / 38°F | 76 mm | 14 | — |
| February | 8°C / 46°F | 3°C / 38°F | 85 mm | 15 | — |
| March | 9°C / 49°F | 4°C / 38°F | 76 mm | 16 | — |
| April | 11°C / 52°F | 5°C / 41°F | 54 mm | 12 | — |
| May | 14°C / 58°F | 8°C / 46°F | 74 mm | 14 | — |
| June | 17°C / 63°F | 11°C / 51°F | 83 mm | 14 | — |
| July | 18°C / 65°F | 12°C / 54°F | 96 mm | 17 | — |
| August | 18°C / 64°F | 12°C / 54°F | 100 mm | 17 | — |
| September | 16°C / 61°F | 11°C / 51°F | 82 mm | 14 | — |
| October | 13°C / 56°F | 9°C / 47°F | 94 mm | 15 | — |
| November | 10°C / 50°F | 6°C / 42°F | 97 mm | 15 | — |
| December | 8°C / 47°F | 4°C / 40°F | 99 mm | 15 | — |
Other cities with similar August weather
🌍 See the full ranked list of climate twins for Belfast in August →
Frequently asked questions
How hot is Belfast in August?
In August, Belfast averages a high of 18°C (64°F) and a low of 12°C (54°F) — generally mild and pleasant.
Does it rain a lot in Belfast in August?
August is quite rainy in Belfast, with about 17 rainy days on average.
Is August a good time to visit Belfast?
August is mild and pleasant but on the rainy side. It suits travelers who are comfortable with mild and pleasant weather; check the month-by-month ranking to compare it against the rest of the year.
What should I pack for Belfast in August?
Pack light layers for warm days and cooler evenings, plus a compact umbrella or rain jacket. See the full August packing list for Belfast for a complete, climate-based checklist.
Check the live 10-day forecast and sunrise/sunset.