Llantrisant Weather in September

With daytime temperatures of 18°C (64°F) and nighttime lows of 11°C (52°F), September in Llantrisant brings pleasant temperatures during the day. Do keep in mind that quite a bit of rainfall is typical. Around 88 mm (3.5 in) falls on average.

Rainfall in Llantrisant in September

The climate data from previous years indicates about 16 days of rain, averaging 88 mm (3.5 in) for the month. A fairly balanced picture this month, some wet days but nothing too extreme in terms of intensity.

Temperature in Llantrisant in September

Temperatures in Llantrisant in September top out at 18°C (64°F) and drop to 11°C (52°F) overnight. Conditions are often most pleasant around the middle of the day. Nights cool down to 11°C (52°F), so a light jacket or extra layer is useful once the sun goes down. On the plus side, the cooler nights make for comfortable sleeping conditions.

Sunshine in Llantrisant in September

The month experiences a moderate amount of sunlight, with 149 hours of sunshine. This provides a nice balance between sunshine and clouds.

Wind Speed in Llantrisant in September

Wind speeds average 4 m/s (8 knots) during September. At this speed, expect moderate winds that can raise dust and move small branches. Since this is an average, some days have gentle light winds while others experience stronger breezes that are quite noticeable.

Average water temperature in September

The water temperature is 15°C (59°F) — chilly, but perfectly fine for a swim if you're not too sensitive to cold water. A short wetsuit can make longer sessions more comfortable.

If your ideal day consists of dry skies and pleasant temperatures, July and August typically offer the best circumstances for Llantrisant.

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

Llantrisant Temperature in September

Min Temperature 11°C (52°F)  

Max Temperature 18°C (64°F)  

Water Temperature 15°C (59°F) *  

Chance of Rain 53%  

Precipitation 88 mm (3.5 in)  

Rainy days 16 days  

Humidity 81% *  

Windspeed 4 m/s (8 knots) *  

Sunshine 149 hours *  

Percentage Sunshine 37% *  

* Data from: Cardiff, the United Kingdom (15 KM, 9 Miles).

What to Wear in Llantrisant in September

Comfortable temperatures call for an easy wardrobe in September. Pack summer basics like t-shirts and shorts, but include a light jacket for cooler moments. A pair of comfortable walking shoes is essential. Expect heavy rainfall, so bring good rain protection and waterproof bags. With water temperatures around 15°C (59°F), the water is quite cold for swimming. You can skip the swimwear unless you're particularly tough. Bring sunglasses since you'll have some sunny periods throughout the month

What To Do in Llantrisant in September

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

Swimming

6/10

Cycling

9/10

Walking

9/10

Camping

8/10

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 Llantrisant's climate page.

More climate data for Llantrisant

Temperature Rainfall Sunshine Humidity Wind Speed Water Temp

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