Lerwick (Shetland Islands) weather

Headline:

Settled over the weekend but cloudy at times on Saturday.

This Evening and Tonight:

A largely dry night with light winds, clear spells and variable amounts of cloud, though there may be the odd isolated light shower for Shetland. Minimum temperature 9 °C.

Saturday:

Dry with some bright or sunny spells to start but likely becoming quite overcast through the day. Best chance of afternoon sunshine for Orkney. Maximum temperature 16 °C.

Outlook for Sunday to Tuesday:

Dry but often cloudy from Sunday through to Tuesday, though there may be some bright or sunny spells breaking through at times.

High pressure is expected to drift to the northwest at the start of this period. This will allow a north to northeasterly airstream to affect much of the UK, leading to rather cool conditions in some northern and eastern areas. As a vigorous area of low pressure emerges into the North Atlantic by the following weekend, connected to what is currently Tropical Storm Erin, high pressure may re-build across the UK for a time, bringing widely fine and dry conditions and for some, an increase in temperatures, relative to the previous few days. The final week of August may see Atlantic weather systems progress over the UK, with a small chance of widely wetter and windier weather developing, though there is much uncertainty in this aspect of the forecast.

Confidence in the details through this period is low. However, low pressure and therefore unsettled or changeable weather looks more likely, and with this comes the potential for stronger winds at times as well. Whether this takes the form of further low pressure systems running in from the Atlantic, or a rather more slowly evolving weather pattern is less clear. Temperatures are likely be near to above average overall.