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Two summer watermelon cosmo cocktails in chilled martini glasses, each with a watermelon wedge.

Summer Watermelon Cosmo

  • Author: Chef Cindy
  • Prep Time: 10 minutes
  • Total Time: 10 minutes
  • Yield: 2 servings 1x
  • Category: Cocktail
  • Method: Blended


Enjoy this delicious Watermelon Cosmo Cocktail at your next summer gathering! 



2/3 cup fresh watermelon juice (1/2 small seedless watermelon – reserve 2 wedges for glass)

1 tsp simple syrup

1 tsp fresh lime juice

3 oz vodka (2 shots)



  1. Prepare fresh watermelon juice by placing watermelon chunks (rinds removed) into a food processor or high-speed blender. Pulse until all chunks are pureed and liquid. Pour the watermelon juice into a strainer over a large measure cup or bowl. Use the back of a spoon to press the mixture through the strainer, removing any pulp. 
  2. Pour the measured amount of watermelon juice into a cocktail shaker along with simple syrup, lime juice, vodka, and ice. 
  3. Shake, shake, shake, and serve immediately in martini glasses. Sip and enjoy!


  • Bottled watermelon juice works well also but omit the simple syrup if it is sweetened – you don’t want the drink to be too sweet!
  • If you have a juicer (and don’t mind the clean-up after), there’s no need to strain the juice after.
  • I recommend chilling the martini glasses beforehand – 30 minutes to 2 hours.
  • You can always add more vodka (for a stronger drink) or less simple syrup if the watermelon is super sweet.
  • If entertaining, make a pitcher. Add ice and mixture to a cocktail shaker, shake, and serve!

Keywords: watermelon cosmo