When Is National Mermaid Day?

The internet history of Mermaid Day

8th of September is National Mermaid Day

  First detected on the 7th of September 2015

  113 tweets


Is It Mermaid Day Today?

It's Mermaid day on the 8th of September.

The most recent detection of references to Mermaid Day was 3 months, 3 weeks ago.

There were many celebrations relating to national holdiays written about on social media that our algorithms picked up on the 8th of September. In total we detected 66 total unique days being shared such as Pledge Of Allegiance Day which had 2,404 people talking about it, or Beer Lovers Day having 1,559 tweets.


How Is The Date For Mermaid Day Calculated?

The day shown for 'National Mermaid Day' is based off how much chitter-chatter and buzz there was on Sept. 8, 2017 across social media making references to 'Mermaid Day'. Our algorithms examine all of the references to National Days across social media and updates whatnationaldayisit.com hourly, with our homepage displaying the current national day, including others such as: Teddy Bear, Signing or Ampersand Day. This crowdsourcing of data method to assess the National Mermaid Day date is used as opposed to being connected with any Government sacntioned lists :D Hurrah for democracy by concensus!


I'd Like To Promote National Mermaid Day

We've put together the following resources full of nifty tips on how to increase the reach of Mermaid Day. The resources include: graphs, badges, and resources on what steps to take to boost Mermaid Day's visibility.

Can I Register Mermaid Day?

We don't have an international authority or governmental remit to declare any officially celebrated "national Mermaid day". We only aim to programatically reflect what 'National Day' it is based of what The Internet Says It Is. We believe this is much more fun as it reflects the nature of how the most amusing / interesting national days are often created organically and grow based off popular social trends and sharing, as such we don't add new days to our database unless they are organically observed on social media.



Is it National Mermaid Day Everywhere?

Yes? No.. Sort of | Maybe ¯\_(ツ)_/¯

What's really intersting is how whilst some National Days like National Daughters Day are seemingly celebrated internationally irrespective of geography, some very popular days (That often become the No. 1 National Day on our homepage) are in fact locally very specific and are offical holidays celebrated on a Country's national calendar. Take National Rambutan Day for instance, Rambutan is a popular Souteast Asian fruit and not seen so much in the UK, Europe or the USA. Some regionally specific trends subsequently become immensely popular internationally and worldwide, partly fuelled by widely shared 'National Days', National Pabebe Wave Day being one such example.


We're now tracking the sentiment around every mention of Mermaid day to show how people feel about Mermaid. See if people like Mermaid here.
We're detecting how Mermaid affects other things more widely than just being a celebrated day. See how Mermaid affects company share prices.


Hang On, It Was National Mermaid Day Already This Year..!?

Yes, this is strangely enough entirely possible. The date shown for National Mermaid Day can change, if for instance several hundred people tweeted about Mermaid Day in early April, then in May a few thousand people tweeted about Mermaid day, then the date shown for National Mermaid Day, could come up twice :D

We have also detected mentions of Mermaid day on;



Get The Badge

National Mermaid Day

It's Mermaid Day
On September 8th


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National Mermaid Day, on the 8th of September

Other Days

National Dog Day
National Donut Day
National Puppy Day
National Girlfriend Day
National Best-Friend Day
National Single Day
National Daughter Day
National Boyfriend Day
National Pug Day
National Daughters Day
National Pet Day
National Pancake Day
National Hug Day
National Hot-Dog Day


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For people who wish to promote National Mermaid Day, we've put together the following resources.
See also: How does Mermaid affect the share price of Apple, Facebook, Microsoft?
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