A girl’s gotta have a cocktail sometime… and a Summer Watermelon Cosmo is one of my favorites! Especially this one which is healthy (ok, I’m pushing it here 😉), delicious and refreshing. If you had a chance to read my post about the benefits of watermelon juice, you will agree it’s worth the effort to make your own juice. And of course, if you have any leftover juice, you can make yourself a Summer Watermelon Cosmo Cocktail!

Updated: By popular demand, this post was updated with additional info and a recipe card.
Not up to making fresh watermelon juice, you can always use store-bought watermelon juice for this watermelon. I like WTRMLN WTR Watermelon Cold Pressed Juice or EVOLUTION Fresh Watermelon Juice. Another recommendation is to purchase a cocktail shaker for making martinis. Give your Watermelon Cosmo a few strong shakes, and you get the little ice crystals that are “oh so good” in a Cosmo!

Ingredients
- Fresh watermelon juice
- Watermelon wedges (for garnishing)
- ½ lime for juicing
- Simple Syrup
- Vodka
- Ice
Equipment
- Freezer chilled martini glasses (just a few minutes is good)
- Juicer or blender and strainer
- Cocktail shaker
Tips & Suggestions
- 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!
- Use a juicer if you have one (and don’t mind the clean-up after). You can skip the strainer then.
- Chill the martini glasses beforehand – I recommend at least 30 minutes and up to 2 hours.
- Make a pitcher if you are entertaining. Simply add ice and mixture to a cocktail shake. Shake and serve!
- Save the pulp and add it to smoothies or freeze it into ice cubes.
- Don’t ditch the watermelon rinds. Subscribe to my newsletter for a recipe coming soon!
Variations
- Add more vodka (for a stronger drink) or less simple syrup if the watermelon is super sweet.
- Flavored vodkas can add another element of flavor.
- If you run out of watermelon juice, you can use cranberry juice.
If you love watermelon as I do, check out some of my other watermelon recipes:
Yellow Watermelon Salsa with Tomatillo
Spicy Watermelon Gazpacho with Jalapeño
Print
Summer Watermelon Cosmo
- Prep Time: 10 minutes
- Total Time: 10 minutes
- Yield: 2 servings 1x
- Category: Cocktail
- Method: Blended
Description
Enjoy this delicious Watermelon Cosmo Cocktail at your next summer gathering!
Ingredients
⅔ cup fresh watermelon juice (½ small seedless watermelon – reserve 2 wedges for glass)
1 tsp simple syrup
1 tsp fresh lime juice
3 oz vodka (2 shots)
ice
Instructions
- 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.
- Pour the measured amount of watermelon juice into a cocktail shaker along with simple syrup, lime juice, vodka, and ice.
- Shake, shake, shake, and serve immediately in martini glasses. Sip and enjoy!
Notes
- 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
Sounds delicious but what are the amounts? 🙂
By popular demand, I finally added a recipe card! Hope this helps so you too can enjoy these delicious cocktails 😋!