The month of September is very rich on holidays and observations. In fact, there are 293 holidays in September! The day with the most holidays in September is September 25 when a whooping 25 (yes, twenty-five) holidays are observed. Quite a coincidence, isn’t it?

Below you will find a comprehensive list of social media holidays and observances celebrated in September. The holidays fall in the following categories:

  • Art & Entertainment
  • Animals & Pets
  • Career & Work
  • Cause
  • Education & School
  • Nature & Environment
  • Family & Relationship
  • Fashion & Beauty
  • Food & Drinks
  • Health
  • History
  • LGBTQ

Social Media Holidays & Observances in September 2021

September 1

  • Global Talent Acquisition Day
  • World Letter Writing Day
  • Ginger Cat Appreciation Day
  • National Acne Positivity Day 
  • National Chicken Boy’s Day
  • National No Rhyme (Nor Reason) Day
  • National Wattle Day (Australia)
  • Building and Code Staff Appreciation Day
  • Emma M. Nutt Day

September 2

  • World Coconut Day 
  • National Blueberry Popsicle Day
  • National V-J Day

September 3

  • International Bacon Day
  • National Chianti Day 
  • National Food Bank Day
  • National Lazy Mom’s Day
  • National Welsh Rarebit Day
  • U.S. Bowling League Day
  • Australian National Flag Day (Australia)
  • Merchant Navy Day (UK)
  • Bring Your Manners To Work Day
  • Skyscraper Day

September 4

  • World Beard Day 
  • World Sexual Health Day
  • International Turkey Vulture Day
  • Beyoncé’s Birthday
  • National College Colors Day
  • National Macadamia Nut Day
  • National Newspaper Carrier Day
  • National Tailgating Day 
  • National Wildlife Day (also celebrated on February 22nd)
  • Eat An Extra Dessert Day

September 5

  • International Day of Charity
  • National Cheese Pizza Day
  • National Be Late For Something Day
  • Pet Rock Day
  • Father’s Day (Australia & New Zealand)

September 6

  • Labor Day
  • National Coffee Ice Cream Day
  • National Read A Book Day

September 7

  • International Day of Clean Air for blue skies
  • World Duchenne Awareness Day
  • National Acorn Squash Day
  • National Another Look Unlimited Day
  • National Beer Lovers Day
  • National Grandma Moses Day
  • National Grateful Patient Day
  • National Neither Snow Nor Rain Day
  • National Salami Day
  • Google Commemoration Day
  • Brazil Independence Day

September 8

  • International Literacy Day
  • World Physical Therapy Day
  • National Ampersand Day
  • National Pediatric Hematology/Oncology Nurses Day
  • Telephone Tuesday
  • Pardon Day

September 9

  • International Sudoku Day
  • National Wiener Schnitzel Day
  • Care Bears Share Your Care Day
  • National Teddy Bear Day
  • Emergency Services Day a.k.a. 999 Day

September 10

  • World Suicide Prevention Day
  • National 401(k) Day
  • National Swap Ideas Day
  • National TV Dinner Day

September 11

  • National Iguana Awareness Day
  • Patriot Day a.k.a 9/11 Day
  • National Hot Cross Bun Day
  • National Make Your Bed Day

September 12

  • International Day for South-South Cooperation
  • National Chocolate Milkshake Day
  • National Grandparents Day
  • National Hug Your Hound Day
  • National Day of Civic Hacking
  • National Day of Encouragement
  • National Pet Memorial Day
  • National Police Woman Day
  • National Report Medicare Fraud Day
  • National Video Games Day

September 13

  • Day of the Programmer
  • Roald Dahl Story Day
  • Positive Thinking Day
  • National Bald is Beautiful Day
  • National Boss/Employee Exchange Day
  • National Celiac Disease Awareness Day
  • National Kids Take Over The Kitchen Day
  • National Peanut Day
  • Uncle Sam Day

September 14

  • National Ants on a Log Day
  • National Coloring Day
  • National Cream Filled Donut Day
  • National Eat a Hoagie Day
  • National Live Creative Day
  • National School Picture Day
  • National Sober Day 
  • Hindi Day (India)

September 15

  • Greenpeace Day
  • International Day of Democracy
  • International Dot Day
  • World Afro Day
  • World Lymphoma Awareness Day
  • National Cheese Toast Day
  • National Crème de Menthe Day
  • National Double Cheeseburger Day
  • National Felt Hat Day
  • National Linguine Day
  • National Online Learning Day
  • National Neonatal Nurses Day
  • National Tackle Kids Cancer Day
  • Make a Hat Day

September 16

  • International Day for the Preservation of the Ozone Layer
  • Anne Bradstreet Day
  • Grito de Dolores (Mexico’s Independence Day)
  • National Guacamole Day
  • National Pawpaw Day
  • National Play-Doh Day
  • National Cinnamon Raisin Bread Day
  • National School Backpack Awareness Day
  • National Stepfamily Day
  • National Tattoo Story Day
  • National Working Parents Day
  • Mayflower Day
  • Trail of Tears Commemoration Day

September 17

  • International Country Music Day
  • International Grenache Day
  • International Patient Safety Day
  • Constitution Day and Citizenship Day
  • National Apple Dumpling Day
  • National Concussion Awareness Day
  • National Monte Cristo Day
  • National Pet Bird Day
  • National POW/MIA Recognition Day
  • National Professional House Cleaners Day 
  • National Table Shuffleboard Day
  • National Tradesmen Day
  • Time’s Up Day

September 18

  • International Eat An Apple Day
  • International Red Panda Day
  • World CleanUp Day
  • World Water Monitoring Day
  • Air Force Day
  • Batman Day
  • Boys’ and Girls’ Club Day for Kids
  • Chiropractic Founders Day
  • Hug A Greeting Card Writer Day
  • Hug Your Boss Day
  • Locate An Old Friend Day
  • National Cheeseburger Day
  • National CleanUp Day
  • National Dance Day
  • National HIV/AIDS and Aging Awareness Day
  • National First Love Day
  • National Respect Day
  • Puppy Mill Awareness Day
  • Responsible Dog Ownership Day
  • Rice Krispies Treats Day

September 19

  • International Talk Like a Pirate Day
  • National Butterscotch Pudding Day
  • National Gymnastics Day
  • National Meow Like a Pirate Day
  • National Woman Road Warrior Day
  • Wife Appreciation Day

September 20

September 21

  • International Day of Peace
  • World Alzheimer’s Day
  • World Gratitude Day
  • National Chai Day
  • National IT Professionals Day
  • National Pecan Cookie Day
  • Miniature Golf Day

September 22

  • Mabon a.k.a. Pagan Autumnal Equinox
  • International Day of Radiant Peace
  • Chainmail Day
  • Hobbit Day
  • World Car-Free Day
  • World Rhino Day
  • American Business Women’s Day
  • Dear Diary Day
  • National Centenarian’s Day
  • National Elephant Appreciation Day
  • National Girls’ Night
  • National Falls Prevention Awareness Day
  • National Fitness Day (UK)
  • National Ice Cream Cone Day
  • National Legwear Day
  • National Online Recovery Day
  • National White Chocolate Day

September 23

  • International Celebrate Bisexuality Day a.k.a. Bi Visibility Day
  • International Day of Sign Languages
  • National Dogs in Politics Day a.k.a. National Checkers Day
  • National Great American Pot Pie Day
  • National Snack Stick Day
  • National Teal Talk Day
  • Remember Me Thursday
  • Restless Legs Awareness Day

September 24

  • World Bollywood Day
  • Bluebird of Happiness Day
  • German Butterbrot Day
  • Heritage Day
  • Hug A Vegetarian Day or Hug a Vegan
  • Love Note Day
  • National Brave Day
  • National Cherries Jubilee Day
  • National Gay Men’s HIV/AIDS Awareness Day
  • National Punctuation Day
  • Native American Day
  • Save The Koala Day
  • Sport Purple for Platelets Day
  • Schwenkfelder Thanksgiving
  • World’s Biggest Coffee Morning

September 25

  • Fish Amnesty Day
  • National First Responder Appreciation Day
  • International Ataxia Awareness Day
  • International Lace Day
  • International Rabbit Day
  • World Dream Day
  • World Pharmacist Day
  • National Bunny Day
  • National Comic Book Day
  • National Cooking Day
  • National Daughter’s Day
  • National Ghost Hunting Day
  • National Family Health and Fitness Day USA
  • National Hunting and Fishing Day
  • National One-Hit Wonder Day
  • National Lobster Day
  • National Math Storytelling Day
  •  National Public Lands Day
  • National Psychotherapy Day
  • National Research Administrator Day
  • National Seat Check Saturday 
  • National Singles Day
  • National Tune-Up Day
  • National Quesadilla Day (Dia de la Quesadilla)
  • Save Your Photos Day

September 26

  • European Day of Languages
  • International Day for the Total Elimination of Nuclear Weapons
  • International Daughters Day
  • World Contraception Day
  • World Rivers Day
  • Johnny Appleseed Day
  • National Better Breakfast Day
  • National Compliance Officer Day
  • National Dumpling Day
  • National Gold Star Mother’s Day
  • National Family Day
  • National Mesothelioma Awareness Day
  • National Pancake Day
  • National Police Memorial Day
  • National Situational Awareness Day
  • National Shamu the Whale Day

September 27

  • World Tourism Day
  • Ancestor Appreciation Day
  • National Chocolate Milk Day
  • National Crush Day / National Crush a Can Day
  • National Corned Beef Hash Day
  • National No Excuses Day
  • National Scarf Day

September 28

  • International Day for Universal Access to Information a.k.a. International Right To Know Day
  • International Poke Day
  • World Rabies Day
  • Ask a Stupid Question Day
  • Fish Tank Floorshow Night
  • National Drink Beer Day
  • National Good Neighbor Day
  • National Family Day
  • National Sons Day
  • National Strawberry Cream Pie Day
  • National Voter Registration Day

September 29

  • International Day of Awareness on Food Loss and Waste Reduction
  • World Heart Day
  • Confucius Day
  • National Biscotti Day
  • National Coffee Day
  • VFW Day

September 30

  • International Blasphemy Rights Day
  • International Podcast Day
  • International Translation Day
  • World Maritime Day 
  • National Chewing Gum Day
  • National Hot Mulled Cider Day
  • National Love People Day
  • National Mud Pack Day
  • National Women’s Health & Fitness Day
  • Orange Shirt Day

Food & Drink Holidays in September 2021

There are 68 holidays in September 2021 related to food and/or drink. Quite amazing, isn’t it?

Some of the biggest food holidays in September are National Coffee Day (September 29), National Pancake Day (September 26) and National Guacamole Day (September 16). There are two chocolate-related holidays in September, too: National White Chocolate Day (September 22) and National Chocolate Milk Day (September 27).

  • September 2: World Coconut Day 
  • September 2: National Blueberry Popsicle Day
  • September 3: International Bacon Day
  • September 3: National Chianti Day 
  • September 3: National Welsh Rarebit Day
  • September 4: International Turkey Vulture Day
  • September 4: National Macadamia Nut Day
  • September 4: National Tailgating Day 
  • September 4: Eat An Extra Dessert Day
  • September 5: National Cheese Pizza Day
  • September 6: National Coffee Ice Cream Day
  • September 7: National Acorn Squash Day
  • September 7: National Beer Lovers Day
  • September 7: National Salami Day
  • September 9: National Wiener Schnitzel Day
  • September 10: National TV Dinner Day
  • September 11: National Hot Cross Bun Day
  • September 12: National Chocolate Milkshake Day
  • September 13: National Kids Take Over The Kitchen Day
  • September 13: National Peanut Day
  • September 14: National Ants on a Log Day
  • September 14: National Cream Filled Donut Day
  • September 14: National Eat a Hoagie Day
  • September 15: National Cheese Toast Day
  • September 15: National Crème de Menthe Day
  • September 15: National Double Cheeseburger Day
  • September 15: National Linguine Day
  • September 16: National Guacamole Day
  • September 16: National Pawpaw Day
  • September 16: National Cinnamon Raisin Bread Day
  • September 17: International Grenache Day
  • September 17: National Apple Dumpling Day
  • September 17: National Monte Cristo Day
  • September 18: International Eat An Apple Day
  • September 18: National Cheeseburger Day
  • September 18: Rice Krispies Treats Day
  • September 19: National Butterscotch Pudding Day
  • September 20: National Fried Rice Day
  • September 20: National Pepperoni Pizza Day
  • September 20: National Punch Day
  • September 20: National String Cheese Day
  • September 20: National Queso Day
  • September 21: National Chai Day
  • September 21: National Pecan Cookie Day
  • September 22: National Ice Cream Cone Day
  • September 22: National White Chocolate Day
  • September 23: National Great American Pot Pie Day
  • September 23: National Snack Stick Day
  • September 24: German Butterbrot Day
  • September 24: National Cherries Jubilee Day
  • September 25: National Cooking Day
  • September 25: National Lobster Day
  • September 25: National Quesadilla Day (Dia de la Quesadilla)
  • September 26: Johnny Appleseed Day
  • September 26: National Better Breakfast Day
  • September 26: National Dumpling Day
  • September 26: National Pancake Day
  • September 27: National Chocolate Milk Day
  • September 27: National Corned Beef Hash Day
  • September 28: International Poke Day
  • September 28: National Drink Beer Day
  • September 28: National Strawberry Cream Pie Day
  • September 29: International Day of Awareness on Food Loss and Waste Reduction
  • September 29: National Biscotti Day
  • September 29: National Coffee Day
  • September 30: National Chewing Gum Day
  • September 30: National Hot Mulled Cider Day

Animal & Pet Holidays in September 2021

  • September 1: Ginger Cat Appreciation Day
  • September 4: National Wildlife Day
  • September 11: National Iguana Awareness Day
  • September 12: National Hug Your Hound Day
  • September 12: National Pet Memorial Day
  • September 17: National Pet Bird Day
  • September 18: International Red Panda Day
  • September 18: Puppy Mill Awareness Day
  • September 18: Responsible Dog Ownership Day
  • September 19: National Meow Like a Pirate Day
  • September 22: World Rhino Day
  • September 22: National Elephant Appreciation Day
  • September 23: National Dogs in Politics Day a.k.a. National Checkers Day
  • September 23: Remember Me Thursday
  • September 24: Bluebird of Happiness Day
  • September 24: Save The Koala Day
  • September 25: International Rabbit Day
  • September 25: National Bunny Day
  • September 26: National Shamu the Whale Day
  • September 28: Fish Tank Floorshow Night