September weather forecast
Plymouth, United Kingdom

The advent of September brings a subtle change in Plymouth's weather. Pleasantness persists despite the drop in temperatures to 18.1°C (64.6°F), indicating an unhurried approach to autumn. The city undergoes a subtle transformation as greeneries display the first sign of autumnal hues. People start retreating indoors after weeks of outdoor enjoyment. The fading warmth of summer still lingers, allowing the celebration of its afterglow.

Temperature

Plymouth experiences a recorded average high-temperature of a comfortable 18.1°C (64.6°F) in September, closely aligned with August's 20°C (68°F). Plymouth experiences a consistent average temperature of 11.6°C (52.9°F) throughout the nights in September.

Rainfall

In Plymouth, during September, the rain falls for 9.9 days and regularly aggregates up to 74mm (2.91") of precipitation. In Plymouth, during the entire year, the rain falls for 142.2 days and collects up to 1007mm (39.65") of precipitation.

Sea temperature

In Plymouth, the average seawater temperature in September is 16°C (60.8°F).
Note: For the majority of people, swimming in water at 16°C (60.8°F) is not enjoyable. The challenge of controlling breathing escalates as the temperature decreases from 21°C (69.8°F) to 15°C (59°F).

Daylight

In Plymouth, the average length of the day in September is 12h and 37min.
On the first day of the month, sunrise is at 6:31 am and sunset at 8:00 pm. On the last day of September, sunrise is at 7:16 am and sunset at 6:56 pm BST.

Sunshine

In Plymouth, United Kingdom, the average sunshine in September is 5.4h.

UV index

In September, the average daily maximum UV index in Plymouth is 4. A UV Index value of 3 to 5 symbolizes a moderate health risk from unprotected exposure to Sun's UV rays for the ordinary person.
Note: In September, the maximum UV index of 4 suggests this advice:
Exercise prevention - Protecting skin and eyes from harm is required. The Sun's UV radiation is especially harmful around midday, so reduce exposure and stay safe. Sun protection is enhanced with clothing that boasts a tight weave yet offers a loose fit.