Merthyr Tydfil Weather in September

In Merthyr Tydfil, September brings moderate daytime temperatures around 18°C (64°F), with nights cooling to 10°C (50°F). Expect quite a bit of rainfall this month.

Rainfall in Merthyr Tydfil in September

This month experiences about 17 days of rain according to historical data, averaging 89 mm (3.5 in). Rain this month is fairly typical, a standard mix of wet and dry days with no particularly heavy or persistent showers.

Temperature in Merthyr Tydfil in September

September in Merthyr Tydfil brings moderate temperatures, with highs of 18°C (64°F) and nights around 10°C (50°F). A light jacket or extra layer can be useful, especially outside the warmest hours of the day. With overnight lows of 10°C (50°F), nights are cold. The cold air does make for deep, comfortable sleep if you have enough blankets.

Sunshine in Merthyr Tydfil in September

The area enjoys a balanced 149 hours of sunlight, ensuring it's neither too overcast nor too sunny.

If you prefer enjoying temperate temperatures and rain-free days, July typically offers the best circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.