The weekend effect is not always accurate and depends on the market of the Friday before. It also should be noted that this only is followed by normal trends and not depressions and rises with significant economic impact. Such as the covid outbreak and the gas shortage. Among other pandemic problems like supply chain and job losses.
The general rule is that if the stock market trends down at the end of the day Friday, when Monday reopens the market it will also down trend for the day. Typically it can peak back up as the week goes on. This can repeat over and over again with a slow rise over the months.
Of course, the stock market is always dependent on the current conditions of the economy and the state of the ability for consumers to purchase goods and services that fuel the market’s gains and financial growths.
The weekend effect can also be the reverse of the earlier mentioned trend. If the weekend ends higher than the start of the day Friday, it will typically continue to grow the following Monday. This is obviously ideal as it grows consistently and gives the most benefit to all who have invested.
BethAshlei 
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