Q&A: Why is this month's weather so miserable? If the jet stream speeds up, air from below is sucked upwards to compensate which lowers the pressure of the atmosphere nearer the ground. Low pressure systems are what bring us unsettled weather conditions. Why is this affecting us this year? Typically the jet stream would be positioned north and west of Scotland during the summer, which would make for rain in the north west of Britain but drier conditions in the south east. This year it has become lodged much further south, over the southern part of England, causing rain in much of England and Wales. What is the forecast for the rest of June? The jet stream is expected to remain stuck over the south for at least two weeks, meaning there is no end in sight for the unsettled weather patterns we have experienced in recent months. Only when it begins to shift northwards might drier and calmer weather begin to prevail.