Below is a quick update on the S&P 500’s average performance by weekday so far in 2019 now that we are more than halfway through the year. As shown, Monday has been the only weekday to average a small decline, while Friday has been by far the best day of the week with an average gain of 0.37%. Tuesday has been the 2nd best day of the week with an average gain of 0.19%, followed by Wednesday at +0.09% and Thursday at +0.02%. So now you know! Get more in-depth market analysis with a two-week free trial to Bespoke Premium.