Saint Athan Weather in September

September in Saint Athan sees daytime temperatures around 18°C (64°F) and lows of 13°C (55°F) at night. With around 92 mm (3.6 in) of rainfall expected, it's worth packing a rain jacket.

Rainfall in Saint Athan in September

Looking at the last 30 years, the data shows about 16 days with rain, averaging 92 mm (3.6 in) for the month. The rainfall pattern this month is fairly balanced. Showers tend to be moderate rather than extreme.

Temperature in Saint Athan in September

Saint Athan in September gets highs of 18°C (64°F) during the day and drops to 13°C (55°F) at night. Experience the summer season in September. The difference between afternoon and evening temperatures is usually noticeable. With lows of 13°C (55°F), nights are cool. If you're out after dark, an extra layer will keep you comfortable. The cooler air at night is also great for getting a good rest.

Sunshine in Saint Athan in September

With about 149 hours of sunshine, the area enjoys a nice balance of sun and overcast, creating a pleasant environment.

Wind Speed in Saint Athan in September

In September, average wind speeds reach 4 m/s (8 knots), leading to light to moderate breezes. Conditions vary from day to day, with both calm and windier periods.

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.

Should you favor a climate that's both dry and comfortably warm, July typically offers the most agreeable 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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• January
• February
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For a detailed overview over the year and the best time to visit the United Kingdom, check out our Saint Athan's climate page.

Saint Athan Temperature in September

Min Temperature 13°C (55°F)  

Max Temperature 18°C (64°F)  

Water Temperature 15°C (59°F) *  

Chance of Rain 52%  

Precipitation 92 mm (3.6 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 (4 KM, 3 Miles).

What to Wear in Saint Athan 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. Expect water temperatures of around 15°C (59°F), which is definitely too cold for comfortable swimming. Your luggage space is better used for other items. Sunglasses could come in handy during the sunnier parts of your trip.

What To Do in Saint Athan 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 Saint Athan's climate page.

More climate data for Saint Athan

Temperature Rainfall Sunshine Humidity Wind Speed Water Temp

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