What's The Weather In Hawaii In September

Hey there, coffee companion! You're probably wondering, "What's the weather like in Hawaii in September?" Well, grab your latte and let's dive in, shall we?

September in Paradise

First things first, Hawaii in September is like the ultimate summer vacation spot. It's still warm and sunny, but with a little twist. You might want to hold onto that latte a bit longer, because it's not too hot, if you know what I mean.

Now, let's talk numbers. The average high temperature hovers around 85°F (29°C). That's right, it's like a perpetual summer over there. But here's the thing, it's not always beach weather. Sometimes, it can dip down to around 75°F (24°C) in the evenings. So, pack a light jacket, just in case.

Rain, Rain, Go Away

You might be thinking, "But what about rain? I don't want to spend my vacation indoors." Well, let me put your mind at ease. September is still a pretty dry month in Hawaii. We're talking about an average of 2 inches (50 mm) of rain spread out over about 10 days. So, you've got plenty of time to work on that tan.

But here's a fun fact for you. The rainy season in Hawaii starts in October, so September is kind of like the calm before the storm. Pun intended, of course. But don't worry, it's not like it's going to pour cats and dogs every day. It's more like a light drizzle here and there.

September Weather in Hilo, Hawaii – 2026 – Winter Sun Expert

Humidity: The Silent Partner

Now, let's talk about humidity. It's like the silent partner in Hawaii's weather dance. In September, the humidity is usually around 70-75%. That might sound high, but it's not too bad. Plus, the trade winds help to keep things bearable.

Speaking of trade winds, they can pick up a bit in September. It's not anything too crazy, but you might want to keep that hat on your head a little tighter. And hey, who knows? You might even catch a wave or two!

Water Temperature: Dive In!

Now, let's talk about the water temperature. I mean, who doesn't want to take a dip in Hawaii, right? In September, the ocean temperature is a lovely 80-82°F (26-28°C). That's like taking a bath in a giant, salty tub. Perfect for swimming, snorkeling, or just floating around like a human log.

Hawaii Weather in September 🏖 (Temperature & Rainfall) ☀️

And here's a little secret. The water is actually warmest in September and October. So, if you're a water baby like me, those are the months to book your ticket.

Sunshine: Hawaii's Favorite Child

Last but not least, let's talk about sunshine. Hawaii is like the sun's favorite child. In September, you can expect around 10 hours of sunshine per day. That's like having a personal sunbeam following you around all day. Just remember to slather on that sunscreen, okay?

So there you have it, folks. September in Hawaii is like the perfect blend of summer and... well, more summer. It's warm, it's sunny, and it's just plain lovely. Now, who's ready to book that ticket?