All humans, ghouls and especially werewolves take note:

On the same day storm Aidan hits Ireland there will also be a rare Halloween blue moon which and it will be visible across some parts of Ireland.

You may ask will the moon be blue and to answer that right away no. Blue moon is a term used for October 31st full moon.

This is a truly special confluence of spookiness; a Halloween full moon visible for all time zones on Earth hasn't happened since 1944 74 years ago, according to the Farmers' Almanac. It won't happen again until 2039.

The first full moon of this month fell on October 1-2, 2020. It was the Northern Hemisphere’s Harvest Moon, or full moon nearest the September equinox. This month will have a second full moon, which – by popular decree – shall be called a Blue Moon. It’ll come on October 31, 2020, which is the night of Halloween. The moon will be blue in name only, but it’ll be near in the sky to a bright red “star” – not really a star at all – but the fiery planet Mars, still at its best now! Don’t miss them.

The last Blue Moon by this definition – the last time we had a second full moon in a single calendar month – was March 31, 2018.

There’s another definition for Blue Moon. It can also be the third of four full moons in a single season, with a season being between a solstice and equinox. The next seasonal Blue Moon will be August 22, 2021.

In recent years, people have been using the name Blue Moon for these two different sorts of moons: second of two full moons in a calendar month, or third of four full moons in a single season.

Blue moons are possible but very rare

Someday, you might see a true blue-colored moon in the sky. Blue-colored moons are rare – aren’t necessarily full – and happen when Earth’s atmosphere contains dust or smoke particles of a certain size, slightly wider than 900 nanometers. Particles of this size are very efficient at scattering red light. When these particles are present in our air, and the moon shines through them, the moon may appear blue in color

You can find all the latest weather warnings and forecasts by downloading our app from the google play store by clicking below