September 1

• American Chess Day

• Bring Your Manners To Work Day

• Cherry Popover Day

• College Colors Day

• Ginger Cat Appreciation Day

• National Acne Positivity Day

• National Chianti Day

• National Food Bank Day

• National Lazy Mom's Day

• National little Black Dress Day

• National No Rhyme Nor Reason Day

• Pink Cadillac Day

• World Letter Writing Day

September 2

• National Blueberry Popsicle Day

• National Hummingbird Day

• National Live Fearless Day

• National Tailgating Day

• Pierce Your Ears Day

• International Bacon Day

• World Coconut Day

• World Beard Day

September 3

• National Doodle Day

• National Pet Rock Day

• National Skyscraper Day

• US Bowling League Day

September 4

• Labor Day

• Eat an Extra Dessert Day

• Mouthguard Day

• National Macadamia Nut Day

• National Wildlife Day

September 5

• National Be Late for Something Day

• National Cheese Pizza Day

• International Day of Charity

September 6

• Fight Procrastination Day

• Janmashtami

• National Coffee Ice Cream Day

• National Read a Book Day

• Great Egg Toss Day

September 7

• Buy a Book Day

• International Day of Clean Air

• National Read a Book Day

• National Acorn Squash Day

• National Beer Lovers Day

• National Feel the Day Day

• National Grateful Patient Day

• National Neither Snow Nor Rain Day

September 8

• Actor's Day

• International Literacy Day

• National 401(k) Day

• National Ampersand Day

• National Dog Walker Appreciation Day

• National Iguana Awareness Day

• Star Trek Day

• Nativity of the Blessed Virgin Mary

• World Physical Therapy Day

September 9

• Care Bears Share Your Care Day

• Emergency Services Day

• Free Dentistry Day

• German Language Day

• International Box Wine Day 

• International Sudoku Day

• National When Pigs Fly Day

• National Teddy Bear Day

• Wonderful Weirdos Day

September 10

• Grandparents Day

• Hug Your Hound Day

• National Pet Memorial Day 

• National TV Dinner Day

• Swap Ideas Day

• White Balloon Day

• World Suicide Prevention Day

September 11

• National Hot Cross Bun Day

• National Make Your Bed Day

• Patriot Day

September 12

• National Ants on a Log Day 

• National Chocolate Milkshake Day

• National Day of Encouragement

• National Video Games Day

September 13

• Defy Superstition Day 

• International Chocolate Day

• National Bald is Beautiful Day 

• National Peanut Day

• National Celiac Disease Awareness Day

• National Twilighters Day

• Positive Thinking Day

• Programmers Day 

September 14

• Are You Okay Day 

• National Coloring Day

• National Cream-Filled Donut Day

• National Eat a Hoagie Day 

• National School Pictures Day 

• National Sober Day 

September 15

• Felt Hat Day 

• Greenpeace Day 

• International Day of Democracy 

• International Dot Day 

• Make a Hat Day 

• National Creme de Menthe Day

• National Double Cheeseburger Day

• National Linguine Day

• National Online Learning Day

• World Lymphoma Awareness Day

• National Concussion Awareness Day 

• National POW/MIA Recognition Day 

• Rosh Hashanah 

• World Afro Day 

• World Engineers Day

• Rosh Hashanah (begins at sunset through sunset of September 17) 

September 16

• Batman Day 

• Collect Rocks Day

• Mexican Independence Day

• International Coastal Cleanup Day 

• International Eat an Apple Day 

• International Red Panda Day 

• National Responsible Dog Ownership Day 

• National Choose Your Chocolate Day

• National Cinnamon Raisin Bread Day

• National Guacamole Day

• National Play-Doh Day

• National Stepfamily Day

• Working Parents Day

• National Gymnastics Day 

• National Tattoo Story Day 

• Puppy Mill Awareness Day 

• Talk Like a Pirate Day 

• World Barber Day 

September 17

• International Country Music Day

• International Patient Safety Day 

• National Apple Dumpling Day

• National Pet Bird Day

• Smithsonian Day 

• Time's Up Day 

• Wife Appreciation Day 

September 18

• Locate an Old Friend Day

• National Cheeseburger Day

• International Equal Pay Day 

• National First Love Day 

• National HIV/AIDS and Aging Awareness Day 

• National Respect Day 

• Purple Bra Day 

• Read an eBook Day 

• Rice Krispies Treats Day 

• U.S. Air Force Day  

September 19

• National Butterscotch Pudding Day

• National Meow Like a Pirate Day 

• National Voter Registration Day

• Ganesh Chaturthi

September 20

• National Care For Kids Day 

• National Fried Rice Day

• National Punch [drink] Day 

• National Pepperoni Pizza Day

• National Queso Day

• National String Cheese Day

September 21

• International Day of Peace

• Miniature Golf Day

• National Black Women's Equal Pay Day

• National Chai Day

• National Opioid Awareness Day

• National Pecan Cookie Day 

• World Gratitude Day

• World Alzheimer's Day

September 22

• Native American Day

• Dear Diary Day 

• Hobbit Day

• Hug a Vegetarian Day 

• National Elephant Appreciation Day

• National Girls’ Night In Day

• National Ice Cream Cone Day

• National White Chocolate Day

• National Singles Day

• World Rhino Day

• World Car-Free Day

September 23

• Fall Equinox

• First Day of Autumn

• National Checkers Day

• Bi Visibility Day

• International Day of Sign Languages

• International Rabbit Day 

• Redhead Appreciation Day 

• National Baker Day 

• National Checkers Day

• National Great American Pot Pie Day 

• National Hunting and Fishing Day 

September 24

• National Cherries Jubilee Day

• National Horchata Day 

• National Punctuation Day

• World Bollywood Day

• World Day of the Deaf

• World Rivers Day 

• Yom Kippur (begins at sunset through sunset of September 25)

September 25

• Binge Day 

• National Comic Book Day

• National Cooking Day

• National One-Hit Wonder Day

• National Quesadilla Day

• National Good Neighbor Day

• National Daughters Day

• National Lobster Day 

• National Psychotherapy Day 

• National Roadkill Day 

• World Pharmacists Day 

September 26

• Love Note Day

• National Dumpling Day

• National Family Day

• National Pancake Day

• Johnny Appleseed Day 

• Lumberjack Day 

• National Key Lime Pie Day 

• Shamu the Whale Day 

• World Day of Migrants and Refugees 

September 27

• Ancestor Appreciation Day

• National Chocolate Milk Day

• World Tourism Day

• National Crush a Can Day 

• National No Excuses Day 

• National Scarf Day 

• National Women's Health and Fitness Day 

September 28

• National Drink a Beer Day

• National Sons Day

• International Right To Know Day 

• Ask a Stupid Question Day 

• National Good Neighbor Day

September 29

• National Biscotti Day

• National Coffee Day

• World Heart Day

• National Starbucks Day 

• Sukkot

September 30

• International Podcast Day

• National Chewing Gum Day

• National Hot Mulled Cider Day

• Save the Koala Day

• International Translation Day 

• National Ghost Hunting Day 

• National Love People Day 

• Pet Tricks Day 

• Save Your Photos Day 

​

September Weekly Observances

• National Waffle Week (September 3-9)

• National Assisted Living Week (September 10-16)

• Suicide Prevention Week (September 10-16)

• National Farm Animals Awareness Week (September 17-23)

• National Rehabilitation Awareness Week (September 18-24)

• Adopt a Less-Adoptable Pet Week (September 18-24)

• Deaf Dog Awareness Week (September 24-30)

• Sea Otter Awareness Week (September 24-30)

September Monthly Observances

• Baby Safety Month

• Better Breakfast Month

• Blood Cancer Awareness Month

• Childhood Cancer Awareness Month

• Classical Music Month

• Gynecologic Cancer Awareness Month

• Hispanic Heritage Month (September 15 to October 15)

• International Square-Dancing Month

• National Chicken Month

• National Honey Month

• National Library Card Signup Month

• National Papaya Month

• National Self-Care Awareness Month

• National Service Dog Month

• National Yoga Awareness Month

• National Mushroom Month

• National Suicide Prevention Awareness Month

• Polycystic Ovarian Syndrome Awareness Month

• Prostate Cancer Awareness Month

• Responsible Dog Ownership Month

• Self-Improvement Month

• Save the Koala Month

• World Candle Month