If you are looking for 31st birthday wishes for sister, this article can help you find exactly what you need. I have collected all the best birthday wishes for her and made a list. She will definitely love them even more when you present them to her personally.

Happy 31st Birthday Wishes For Sister

1. Happy 31st Birthday to my awesome Sister, who makes me laugh, and is always there for me. We’ve had a few rough times, but what family doesn’t, we get threw them though. You make me proud every day to be your sister and I love you very much! Thanks for being in my life!
2. Today, you are exactly 31 years old sis. Happy birthday! The world is definitely a better place to have a soul-mate like you in it. You may not always be with me, but you will stay in my heart forever. I pray that you find all the happiness in this life that you could ever wish for, and know that no matter what happens, I will always love you and see you as the bright shining star that lights up my life.
3. Happy 31st Birthday. Growing up we had fights, laughs and screams together. We have been through a lot and I wouldn’t trade that time for anything. I know your heart has been broken many times and so has mine because you are my sister. You are my best friend in the whole world. I love you!
4. You are the best big sister anyone could have asked for. You’ve always been there for me and I’m so appreciative of that. I count my blessings each day to have you in my life. Happy 31st Birthday. I love you.
5. Happy 31st Birthday. 3 years ago on a brisk winter morning I came to this beautiful world. Though my parents were new to caring for a baby, you were always there for me through thick and thin. You helped guide me on this confusing journey called life and I owe who I am today to you. Thanks for all the love and support, I love you so much sis!
6. Every year you have gotten wiser and wiser. Your knowledge and intelligence are a reflection of the time and hard work that you put into yourself. I have seen you develop from a boy to a man, and I am so proud at the incredible person that you have become. Happy 31st Birthday.
7. It seems that no matter what I do or say all I ever hear is, “When I grow up, I’m moving out and not coming back until I have a boyfriend who appreciates me.” You’re 31 years old! How can you still be living under my roof? When are you going to finally put on some big girl panties and move out already?
8. Being the baby of the family has it’s privileges, like being spoiled rotten. “I can have anything I want,” you say, “Just because I’m the baby.” But guess what? Not anymore! You are officially an adult! Happy 31st Birthday.
9. You are the light of my life and the only sister I could ever ask for. At 30 years old you are still able to bring me to my knees with laughter. You’ve always been so sweet to all the people around you, and the old saying “blood is thicker than water” is true in our case, because you are the best sister a girl could ask for. Happy 30th Birthday!
10. Happy 31st birthday, sis! It’s been a great 21-something years of getting to know each other, learning from each other, laughing at each other and loving each other. I hope the next 10 years are just as great and that you look back on them half as fondly as you have these first 31 years! I love you!
11. Sis! I know you are going to make it to that big old thirties. You turned thirty today but let’s just hope it goes a bit smoother this time. Now, as for today, we really want to wish you a happy birthday and let you know how much you mean to all of us. We won’t even get started with all the good times we’ve had together. All we want is for you to have an amazing birthday and enjoy every day of your life. Happy 31st Birthday sis!
12. Happy 31st Birthday to you. I hope this year is filled with joy. May God bless you and keep you safe. You are the best sister there could ever be and I love you so much!
13. Sis, you are the best sister in the entire world. You make me laugh, smile and forget about my problems. You’re always there for me no matter what. I love you more than you’ll ever know! Have a lifetime of happiness and joy! Happy 31st Birthday sis!
14. Happy 31st Birthday, sis!  I just wanted to take this moment to say that you mean so much to me and I love you. You are the most beautiful person I have ever known and your smile makes my heart melt. I hope you have the best time today and I can’t wait to see what happens next.
15. Happy 31st Birthday sis! You’ve grown into a wonderful, caring and intelligent lady. I am so proud to call you my sister and I hope we can grow closer in the years to come. I can’t wait to see what the future holds for you, but no matter where life takes you or what it brings, you will always have a loving family in me. Love you always!
16. Happy 31st Birthday sis! The day I was born, you were a beautiful new baby girl. Since then, you have come so much more. You have become a beautiful young woman with a heart of gold and a smile that could make anyone happy, including me! You have shown me what it means to be a sister, a best friend and an amazing person. Your life is getting ready to take off and go into the next phase of crazy busy, but if you ever need your sister to talk or comfort you know I am always there for you.
17. It’s your 31st birthday which means another year has passed. You are old, but hopefully still young at heart. May all your dreams and wishes come true this year and beyond.
18. Since I was so young, you’ve been my absolute best friend. When I was little, I loved playing “house” with you and you’re Babies. I loved making up silly stories with you. And when we grew old enough to be away from our parents, you were there for me. Happy 31st Birthday sis!
19. Sister, you are an incredible woman. You make me proud of who you have become and I wish for many more years of happiness. It is an honour to have the best sister ever! Happy 31st Birthday sis!
20. Happy birthday my darling sister. How you can only be 31 and still act like a child sometimes is beyond me! You do it so well though, that you even make me feel young. Thinking about having fun on your big day!!!!!!
21. Happy 31st birthday, sis! I don’t know where time has gone, but it goes way too fast for me. You have made my life better than I ever thought it could be and I can’t wait to see all the new things you will accomplish this year. Happy 31st birthday!
22. I think that I should say congratulations again now that you’re officially 31. You’ve grown up into a lovely, smart lady who has so much to look forward to. I’m proud of you and hope your 31st birthday is as fantastic as you are.
23. My dear sister, I hope you feel loved and happy. I wish that you have a wonderful year. You are my best friend and I am so happy to have you in my life. Happy 31st birthday sis!
24. Happy 31st birthday sis! You are my morning sunshine. You give me good advice and always lend an ear when I need it. I’m so glad we became close friends in high school! On your special day my wish for you is that you will always stay happy and keep smiling. I love you forever sis!
25. You’re always there for me in the good times and bad. You’ve been a great friend and I’m lucky to have you in my life. I’m so excited for your future! You always make me happy, even when it doesn’t seem like you are trying to. I’ll celebrate every amazing milestone with you, from here on out, we will celebrate them together! Happy 31st birthday and cheers to the next 31 years sis!
26. Happy 31st birthday sis! You are the best sister in the world. Whether I’m looking for a shoulder to cry on, an ear to listen to me whine about my problems or advice, you always know exactly what to say. You’re one of the most caring people I know and I’m so lucky to have someone like you in my life! I hope that you have the best birthday ever. Love ya Sis!
27. We’re about to enter your 3rd decade, and you are more beautiful than ever. As we grew up, I watched you turn from a baby sister into an independent woman. Now as an adult, I am so proud of you. Your big heart is always radiating sunshine and your gorgeous smile lights up the room. To my little butterfly, I love you! Happy 31st birthday sis!
28. Happy 31st birthday sis! I’m not exactly sure when it happened, but at some point in my life you became the most important person in my world. I look up to you, respect you and appreciate all that you do. Now that we’re both adults I miss the days of staying up late playing games and just being carefree. As much as I miss the sister I grew up with, I am so happy to have a strong woman by my side. You are my best friend and I love.
29. I am so glad to have you as my sister! You’re such a wonderful person and I am lucky to have you in my life. You have a big heart and are always there to lend a hand or a kind word when I need it. I don’t know what I would do without you! Happy 31st birthday sis!
30. Happy 31st birthday sis! There are 31 days in February, and I send you 31 cards. You never know which one you’ll find on any given day so no matter when you open them they will always be new and fresh. I hope that this little tradition continues to bring you as much joy as it will me and each new year brings more memories and laughs than the last.
31. Dear sister, today you turn 31 years old. There aren’t enough words to describe what a wonderful sister you’ve been to me. I love you so much. You are so generous and kind. Happy Birthday!
32. It is hard to believe that you are finally 31. You’ve led us on some interesting and wild adventures, but at the end of the day you are still my sister. I hope that you have an amazing birthday and can find that smile that only comes from being with our family. I love you!
33. I want to wish my dearest sister a very happy 31st birthday. The last three decades of your life has been so amazing. You are the best sister I could ever ask for and I truly know heaven had an angel deliver you straight to me. Enjoy your special day sweetheart, because I love you to the moon and back!
34. Happy 31st! You are the best sister ever. I love your positive spirit and can always count on you for advice. Wish you the happiest year yet!