Weather in Cardiff in September
Cardiff, United Kingdom averages a high of 17.5°C (63.5°F) and low of 11.6°C (52.9°F) in September, with 11 rain days and 8.3 hours of daily sunshine. Travel score: 66.9/100 (Good). The best time to visit Cardiff is July.
High
18°C64°F
Low
12°C53°F
🌧️
11
rain days
☀️
8.3
hrs/day sunshine
💧
81%
humidity
67— Good
September in Cardiff is mild and occasionally wet — pack an umbrella and enjoy indoor attractions too.
What are the average temperatures in Cardiff?
How much does it rain in Cardiff in September?
Cardiff receives an average of 78.2mm of rainfall across 11 rainy days in September. The annual total is 1041.5mm.
What should I pack for Cardiff in September?
Essentials
👟
Comfortable walking shoes
Essential for exploring the city
🧥
Mix of light and warm layers
Mild temperatures around 18°C
Recommended
🧥
Light rain jacket
Some rainy days expected (11 days)
☔
Umbrella
Be prepared for occasional showers
🧴
Sunscreen
Sun protection is still recommended
🕶️
Sunglasses
Useful for sunny periods
Traveling to United Kingdom in September?
Don't let a public holiday surprise you — restaurants, shops, and attractions may be closed.
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Data based on 1994–2024 averages · Last updated: 2024-12-31