September weather forecastLerwick, United Kingdom
September weather for Lerwick, United Kingdom: September, the first month of the autumn in Lerwick, is also a fresh month, with an average temperature varying between 11.5°C (52.7°F) and 12.8°C (55°F). In Lerwick, United Kingdom, in September, the average water temperature is 12.7°C (54.9°F).
September
Weather in September
September, the first month of the autumn in Lerwick, is also a fresh month, with an average temperature varying between 11.5°C (52.7°F) and 12.8°C (55°F).Temperature
September's beginning signals an average high-temperature of a cool 12.8°C (55°F), barely different from August's 14°C (57.2°F). Nighttime temperatures hover around an average low of 11.5°C (52.7°F) in September, a slight descent from daytime highs.Humidity
In September, the average relative humidity in Lerwick is 83%.Rainfall
In September, the rain falls for 20 days. Throughout September, 56mm (2.2") of precipitation is accumulated. Throughout the year, in Lerwick, there are 250.8 rainfall days, and 719mm (28.31") of precipitation is accumulated.Snowfall
In Lerwick, snow does not fall in June through October.Sea temperature
In September, the average sea temperature in Lerwick is 12.7°C (54.9°F).Note: In 12.7°C (54.9°F), even brief exposure to 13°C (55.4°F) feels biting, and anything less than 10°C (50°F) risks cold shock and impaired breathing, considering one's health.
Daylight
In September, the average length of the day is 12h and 52min.On the first day of the month, sunrise is at 6:00 am and sunset at 8:08 pm. On the last day of September, sunrise is at 7:09 am and sunset at 6:39 pm BST.
Sunshine
The average sunshine in September in Lerwick is 6h.UV index
The average daily maximum UV index in September in Lerwick is 3. A UV Index estimate of 3 to 5 represents a medium vulnerability from unsafe exposure to UV radiation for the average person.Note: In September, a regular UV index of 3 translates into these guidelines:
Guard yourself - Precautionary measures against sun damage are advocated. For skin protection, it's recommended to minimize Sun exposure during its peak hours around midday. Counter UV radiation's ill effects with clothing designed for sun safety and UV-resistant eyewear. Keep in mind! Snow's reflective quality can nearly double the intensity of the Sun's UV radiation.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Lerwick, United Kingdom
- Average high temperature in September: 12.8°C
The warmest month (with the highest average high temperature) is August (14°C).
The month with the lowest average high temperature is February (6.8°C).
- Average low temperature in September: 11.5°C
The month with the highest average low temperature is August (12.4°C).
The coldest month (with the lowest average low temperature) is February (4.9°C).
Average pressure in September
Lerwick, United Kingdom
- Average pressure in September: 1010.1mbar
The months with the highest atmospheric pressure are May and June (1014.3mbar).
The month with the lowest atmospheric pressure is December (1002.5mbar).
Average wind speed in September
Lerwick, United Kingdom
- Average wind speed in September: 29.5km/h
The windiest month (with the highest average wind speed) is January (38.7km/h).
The calmest month (with the lowest average wind speed) is July (22.5km/h).
Average humidity in September
Lerwick, United Kingdom
- Average humidity in September: 83%
The month with the highest relative humidity is July (86%).
The month with the lowest relative humidity is December (75%).
Average rainfall in September
Lerwick, United Kingdom
- Average rainfall in September: 56mm
The wettest month (with the highest rainfall) is December (90mm).
The driest month (with the least rainfall) is June (32mm).
Average rainfall days in September
Lerwick, United Kingdom
- Average rainfall days in September: 20 days
The month with the highest number of rainy days is December (25.8 days).
The month with the least rainy days is June (14.8 days).
Average snowfall in September
Lerwick, United Kingdom
- Average snowfall in September: 0mm
The month with the highest snowfall is February (12mm).
The months with the least snowfall are June, July, August, September and October (0mm).
Average snowfall days in September
Lerwick, United Kingdom
- Average snowfall days in September: 0.1 days
The months with the highest number of snowfall days are February and March (2.2 days).
The months with the least snowfall days are June, July, August and October (0 days).
Average sea temperature in September
Lerwick, United Kingdom
- Average sea temperature in September: 12.7°C
The best month for swimming (with the highest average sea temperature) is August (13.3°C).
The coldest month (with the lowest average sea temperature) is March (7.8°C).
Average daylight in September /
Average sunshine in September
Lerwick, United Kingdom
- Average daylight in September: 12h and 54min
The month with the longest days is June (Average daylight: 18h and 48min).
The month with the shortest days is December (Average daylight: 6h and 0min).
- Average sunshine in September: 6h and 0min
The month with the most sunshine is June (Average sunshine: 9h and 18min).
The month with the least sunshine is December (Average sunshine: 2h and 6min).
Average sunshine days in September
Lerwick, United Kingdom
- Average sunshine days in September: 6.8 days
The month with the most sunshine days is June (12.1 days).
The month with the least sunshine days is December (2.1 days).
Average UV index in September
Lerwick, United Kingdom
- Average UV index in September: 3
The months with the highest UV index are June and August (UV index 4).
The months with the lowest UV index are January, February, March, April, November and December (UV index 2).
Average cloud cover in September
Lerwick, United Kingdom
- Average cloud cover in September: 61
The month with the most cloud cover is January (Cloud cover 71).
The month with the least cloud cover is May (Cloud cover 56).
Average visibility in September
Lerwick, United Kingdom
- Average visibility in September: 10km
The months with the highest visibility are February, April, May, June, July, August, September and October (10km).
The months with the lowest visibility are January, March, November and December (9km).
