Lerwick Weather in September

The climate in Lerwick during September can be summarized as mild and damp.

September is in the fall / autumn in Lerwick and is typically the 3rd warmest month of the year. Daytime maximum temperatures average around a cool 13°C (55°F), whilst at night 8°C (47°F) is normal.

On average September is the 5th wettest month of the year in Lerwick with around 115mm 4.5 inches of rain making it a damp time to visit. This rainfall is typically spread over 22 days, although this may vary considerably.

On the flip side this corresponds to an average of 3.5 hours of sunshine per day.

The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in Lerwick in September 2025.