Weather in Harlyn Bay, Cornwall, United Kingdom in September

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Visiting Harlyn Bay, Cornwall, United Kingdom in September

September is one of the best months to visit Harlyn Bay for the best beach weather. It has the most sunshine and best sunbathing and swimming conditions of the year.

The weather in September is marginally cooler than the previous month and temperatures continue to drop into October. September has average maximum temperatures of 17°C (63°F) which is not that warm but sunbathing may be possible on some clear days. The sunshine percentage is 40% making it very cloudy and overcast with some periods of sunshine. There are 5.1 hours of sunshine per day.

September has total rainfall of 0.4cm (0.2inches) making it mostly dry with very rare light showers although there are 15.2 days with some rainfall, so on the days it does rain it is only light and intermittent and shouldn't affect your beach enjoyment too much.

Sea temperatures are a cold 16°C (61°F). September is too cold for swimming in Harlyn Bay for any length of time, unless you have a wetsuit. The sea temperature in September is marginally cooler than the previous month and temperatures continue to drop slightly into October.

As summer comes to an end, the weather in September at Harlyn Bay remains warm and sunny, but the days start to get shorter. Sunbathing and swimming are still enjoyable, and the water temperature is still comfortable for snorkeling and diving. Surfing, windsurfing, and kitesurfing remain popular, with consistent swells and moderate winds. Also consider visiting Harlyn Bay in one of the other best months of June, July, August, for the best beach weather. Also consider one of our other suggestions for September.

Can you sunbathe in Harlyn Bay in September?

No, September is not a good time for sunbathing in Harlyn Bay.

September has average maximum temperatures of 17°C (63°F) which is not that warm but sunbathing may be possible on some clear days. The sunshine percentage is 40% making it very cloudy and overcast with some periods of sunshine. There are 5.1 hours of sunshine per day. September has total rainfall of 0.4cm (0.2inches) making it mostly dry with very rare light showers although there are 15.2 days with some rainfall, so on the days it does rain it is only light and intermittent and shouldn't affect your beach enjoyment too much.

More about September temperature and sunshine.

Can you swim in Harlyn Bay in September?

No, September is too cold for swimming in Harlyn Bay for any length of time, with the sea water at 16°C (61°F), unless you have a wetsuit.

More about September sea temperatures.

Is September a good time to holiday in Harlyn Bay?

Yes, September is a slightly cool time for a holiday in Harlyn Bay.

September has average maximum temperatures of 17°C (63°F) which is not that warm but sunbathing may be possible on some clear days. The sunshine percentage is 40% making it very cloudy and overcast with some periods of sunshine. There are 5.1 hours of sunshine per day. September has total rainfall of 0.4cm (0.2inches) making it mostly dry with very rare light showers although there are 15.2 days with some rainfall, so on the days it does rain it is only light and intermittent and shouldn't affect your beach enjoyment too much. Sea temperatures are a cold 16°C (61°F). September is too cold for swimming in Harlyn Bay for any length of time, unless you have a wetsuit.

More about the September temperatures and sunshine.

Is Harlyn Bay warm in September?

No, Harlyn Bay is not that warm but sunbathing may be possible on some clear days in September.

The average maximum temperature in Harlyn Bay in September is 17°C (63°F). The average maximum temperature is 18°C (65°) in the previous month and 15°C (59°F) in the next month.

The average temperature in Harlyn Bay in September is 14°C (58°F). The average temperature is 16°C (60°F) in the previous month and 12°C (54°F) in the next month.

More info about the September temperatures and sunshine.

How sunny is Harlyn Bay in September?

The average day light hours per day in Harlyn Bay in September are 12.7. The sunshine percentage is 40% making it very cloudy and overcast with some periods of sunshine. There are 5.1 hours of sunshine per day.

More about September sunshine.

Crowds in Harlyn Bay in September

As the summer holidays come to an end, the crowds at Harlyn Bay begin to dissipate in September. The beach returns to a more moderate level of busyness, and you can enjoy the remaining warm days with fewer people around.

Temperature in Harlyn Bay in September

The weather in September is marginally cooler than the previous month and temperatures continue to drop into October. The average maximum temperature in Harlyn Bay in September is 17°C (63°F). The average maximum temperature is 18°C (65°F) in the previous month and 15°C (59°F) in the next month.

The average temperature in Harlyn Bay in September is 14°C (58°F). The average temperature is 16°C (60°F) in the previous month and 12°C (54°F) in the next month.

The average minimum temperature in Harlyn Bay in September is 12°C (53°F). The minimum temperature is 13°C (56°F) in the previous month and 10°C (50°F) in the next month.

Sunshine in Harlyn Bay in September

The days in September are shorter than the previous month and days continue to get shorter into October. September has far fewer hours of sunshine than the previous month and hours of sunshine continue to drop quickly into October. During September the average day light hours are 12.7 per day in Harlyn Bay. The sunshine percentage is 40% making it very cloudy and overcast with some periods of sunshine. There are 5.1 hours of sunshine per day.

The ultraviolet index in Harlyn Bay in September is typically 4.3 during September. An ultraviolet index reading of 3 to 5 indicates there is a moderate risk of harm from unprotected sun exposure. Keep out of the sun during the strongest hours around midday when unprotected skin risks burning in less than 30 minutes. For the sensitive wear protective clothing, a wide-brimmed hat, and UV-blocking sunglasses. Generously apply broad spectrum SPF 30+ sunscreen every 2 hours, even on cloudy days, and after swimming or sweating. Tanning for hours is possible with the right application of sun cream. Watch out for relections from water that may increase ultraviolet exposure.

Sea Temperature in Harlyn Bay in September

The average sea water temperature in Harlyn Bay in September is 16.1°C (61.0°F) which is cool for swimming, shorty wetsuit may help you extend your time in the water. The sea temperature in September is marginally cooler than the previous month and temperatures continue to drop slightly into October.

Rainfall in Harlyn Bay in September

September weather is slightly drier than the previous month. September has fewer days of rain than the previous month. The average total rainfall in Harlyn Bay in September is 0.4cm (0.2inches) and on average there are 15.2 rainy days in September making it a wet time to visit the beach.

Humidity in Harlyn Bay in September

The maximum dew point (an indicator of humidity) in Harlyn Bay in September is 14°C (58°F) which is comfortable for everyone. The dew point is 15°C (59°F) in the previous month and 13°C (13°F) in the next month.

The average maximum relative humidity in Harlyn Bay in September is typically 96.9%. The maximum relative humidity is 97.6% in the previous month and 97.2% in the next month.

The average relative humidity in Harlyn Bay in September is typically 86.4%. The average relative humidity is 86.4% in the previous month and 87.2% in the next month.

Wind Speed in Harlyn Bay in September

The average maximum wind speed in Harlyn Bay in September is typically 27KM/H (17MPH). The average maximum wind speed is 26KM/H (16MPH) in the previous month and 30KM/H (19MPH) in the next month.

The average wind speed in Harlyn Bay in September is typically 17KM/H (11MPH). The average wind speed is 16KM/H (10MPH) in the previous month and 20KM/H (12MPH) in the next month.

The average wind direction in Harlyn Bay in September is from the West.

Monthly Averages

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