Cardiff in August
In August, Cardiff averages 20°C (68°F) during the day and 13°C (56°F) at night, with frequent rain — about 15 days of the month see precipitation (105 mm total).
Peak seasonConditions are comfortable for sightseeing without being sweltering. Plan for unsettled weather and bring rain gear.
August offers comfortable temperatures in Cardiff, with some rain to plan around.
How August compares to the rest of the year in Cardiff
August is one of the warmest months in Cardiff (2nd of 12) and moderately rainy compared to the rest of the year (5th of 12). Daytime temperature runs 6°C above the annual average (14°C). August runs 1°C cooler than July (21°C) and cools 1°C in September (18°C).
August sunrise & sunset in Cardiff
Times shown for Cardiff 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 Cardiff — August
Golden-hour and blue-hour windows for the 15th of August, in Cardiff's local time. Use these for soft warm light (golden) or cool architectural twilight (blue).
📅 When to book — Cardiff 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 (Peak season) and Cardiff'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 Cardiff
Cardiff is in peak season during this month — expect bigger crowds at famous sights, higher hotel and flight prices, and longer queues. Restaurant reservations a few days out are advisable, and any boutique hotels you have your eye on should be booked weeks ahead. The trade-off: most attractions, restaurants, and seasonal services are fully open, the weather is at its most reliable, and the city feels at its most alive.
Why this tier: excellent tourism weather Northern Hemisphere summer holidays
Sun & mosquito risk — August in Cardiff
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.
Cardiff in other months
| Month | Avg high | Avg low | Rainfall | Rain days | Snow days |
|---|---|---|---|---|---|
| January | 8°C / 47°F | 3°C / 38°F | 111 mm | 17 | — |
| February | 9°C / 48°F | 3°C / 38°F | 102 mm | 14 | — |
| March | 10°C / 51°F | 4°C / 40°F | 97 mm | 16 | — |
| April | 13°C / 56°F | 5°C / 42°F | 61 mm | 10 | — |
| May | 16°C / 61°F | 9°C / 48°F | 82 mm | 12 | — |
| June | 19°C / 67°F | 12°C / 54°F | 67 mm | 13 | — |
| July | 21°C / 69°F | 14°C / 56°F | 80 mm | 14 | — |
| August | 20°C / 68°F | 13°C / 56°F | 105 mm | 15 | — |
| September | 18°C / 65°F | 12°C / 53°F | 87 mm | 12 | — |
| October | 15°C / 59°F | 10°C / 49°F | 134 mm | 15 | — |
| November | 11°C / 52°F | 6°C / 43°F | 114 mm | 16 | — |
| December | 9°C / 49°F | 5°C / 41°F | 139 mm | 18 | — |
Other cities with similar August weather
🌍 See the full ranked list of climate twins for Cardiff in August →
Frequently asked questions
How hot is Cardiff in August?
In August, Cardiff averages a high of 20°C (68°F) and a low of 13°C (56°F) — generally mild and pleasant.
Does it rain a lot in Cardiff in August?
August is quite rainy in Cardiff, with about 15 rainy days on average.
Is August a good time to visit Cardiff?
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 Cardiff 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 Cardiff for a complete, climate-based checklist.
Check the live 10-day forecast and sunrise/sunset.