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.

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For a detailed overview over the year and the best time to visit the United Kingdom, check out our Merthyr Tydfil's climate page.

Merthyr Tydfil Temperature in September

Min Temperature 10°C (50°F)  

Max Temperature 18°C (64°F)  

Chance of Rain 55%  

Precipitation 89 mm (3.5 in)  

Rainy days 17 days  

Humidity 81% *  

Sunshine 149 hours *  

Percentage Sunshine 37% *  

* Data from: Cardiff, the United Kingdom (38 KM, 24 Miles).

What to Wear in Merthyr Tydfil in September

For Merthyr Tydfil in September, you'll want flexible clothing. It's wise to pack cotton shirts, comfortable shorts, and a pair of jeans for cooler evenings. A light sweater or jacket is useful for air-conditioned spaces (like buses) or unexpected cool moments. High rain levels are expected, so pack waterproof gear and an umbrella or poncho. It won't hurt to bring your sunglasses along, as you'll see some sunny periods.

What To Do in Merthyr Tydfil in September

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Swimming

6/10

Cycling

6/10

Walking

6/10

Camping

4/10

Outdoor sports

9/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit the United Kingdom, check out our Merthyr Tydfil's climate page.

More climate data for Merthyr Tydfil

Temperature Rainfall Sunshine Humidity

See the full Merthyr Tydfil climate overview or explore weather in the United Kingdom.