
Drink, drink, drink! 
Slather on the sunscreen. Whether it’s the old school lotion or the spray bottle, put it on and make sure it’s a high protection number (so think 30+). Put it on before your round and bring it along for the turn after the 9th hole. …better yet, you should be doing this all year round since you’re outside on the course!
Wear proper clothes. There are plenty of golf companies that make breathable attire. Not only will air circulate trough your clothes better but you’ll also be protecting yourself from the sun. …and don’t fear looking like “that guy” and flip up the collar of your shirt to protect your neck. No one cares that you look like a jabronie.
Avoid the sun. 
Timing is everything. Schedule your tee time for earlier in the morning rather than later. Most courses have early times but they’ll be a hot commodity so make sure you call ahead to get that time secured. You’ll need to bring a light jacket because sometimes it’s a little chilly in the morning but once that sun is up it’ll burn hot pretty quick. You’ll finish around lunch and have a perfect excuse to go grab lunch.
Pay attention to how you feel. Seriously, heat stroke is no joke. Know the signs of dehydration and heat exhaustion: weakness, headache, muscle cramps, irritability (yes that last shot may have sucked but I’m talking more angry than usual), nausea, vomiting, light-headedness, feeling hot on head and neck, dry and sticky mouth, tiredness, lack of sweating, and rapid heartbeat. Make sure you have your cell phone in case of emergency.
Stay cool my friends!

Playing golf in hot weather can give you a serious tan and sunburn. Sunscreen is important for every weather, No matter there is sunny day or rainy day, Sunscreen is equally important.
https://jacketsunscreen.com/