Based on SPY performance patterns in 2025 so far, we analyzed weekday tendencies and seasonality factors (options expiry, month-end effects, and Santa rally). Below you’ll find a summary of which weekdays historically had the strongest probability of rising, along with heatmap calendars for the remaining months of the year.
| Weekday | Average Score |
|---|---|
| Thursday | 2.85 |
| Wednesday | 2.43 |
| Monday | 1.23 |
| Tuesday | 0.31 |
| Friday | -0.69 |
📌 Key Takeaways: - Wednesdays and Thursdays are most bullish. - Fridays historically weakest. - Santa rally effect expected in the final week of December.
