World 'Is a Blue Moon really blue?' All you need to know about October 31's rare phenomenon Updated : October 30, 2020 04:23 PM IST Interestingly enough, the appearance of the moon has little to do with the colour 'Blue'. The full moon on October 31, 2020 may not look blue; it's called Blue Moon as it will be a second full moon this month. Subscribe to Moneycontrol PRO at just Rs.33/- per month for the first year. Use code SUPERPRO. Limited period offer. Available on Web and Android.