'Sell in May and go away'. It is one of the oldest adages in the City, suggesting that stock markets underperform during the summer months. But if you are a busy professional trying to build long-term wealth, treating your ISA like a day-trading account is a terrible idea.
Time in the market always beats timing the market. Always.
Boring is Profitable
Your job is to generate income through your career. Your portfolio's job is to grow quietly in the background. If you pull your money out of the market to avoid a hypothetical summer slump, you have to make two correct decisions: when to get out, and when to get back in. Nobody gets both right consistently.
Instead of reading the financial press and panicking, focus on your cashflow. Automate your monthly investments into globally diversified, low-cost index funds. Then log out of your brokerage app, go outside, and enjoy the summer. Boring investing is profitable investing.