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The pleasant weather in Hawaii draws visitors from around the world all year round. If you’re wondering what Hawaii’s weather is like in August specifically, you’ve come to the right place.
If you’re short on time, here’s a quick answer to your question: August weather in Hawaii brings warm temperatures, slightly cooler ocean water, lower chances of rain on most islands, increased humidity, and generally idyllic beach weather overall.
In this comprehensive guide, we’ll cover everything you need to know about Hawaii’s August climate, including average temperatures, rainfall patterns, ocean conditions, and tips on what to pack for your Hawaiian vacation this time of year.
Average August Temperatures in Hawaii
High and Low Temperatures
In August, Hawaii experiences warm summer temperatures, with highs ranging from the mid-80s to low 90s Fahrenheit across the islands. According to climate data from the National Oceanic and Atmospheric Administration (NOAA), average daytime highs in August are around 89°F on Oahu and 87°F on Maui.
The typical low temperatures at night range from the upper 60s to mid 70s, allowing for comfortable sleeping weather. For example, Honolulu on Oahu sees average overnight lows of 74°F in August, while Kahului on central Maui has typical August lows of 71°F.
Temperature Differences Among the Islands
There can be noticeable differences in the August heat levels among the Hawaiian Islands. The largest island of Hawaii (the Big Island) boasts warmer summer temperatures than the other islands in the chain due to its size, elevation range, and volcanic landscape.
| Island | Typical August High Temp |
|---|---|
| Oahu | 89°F |
| Maui | 87°F |
| Big Island | 91°F |
As the table shows, the average high on Hawaii Island reaches around 91°F during the summer, which is a few degrees warmer than Oahu and Maui. The other islands have more moderate temperatures thanks to cooling trade winds.
The weather can also vary greatly with altitude on the tallest islands. For example, Haleakala on Maui has elevations over 10,000 feet and sees average August highs around 70°F, which is almost 20 degrees cooler than at sea level.
So while August is undoubtedly still beach weather across Hawaii, temperatures are often at their hottest and most humid on the Big Island, while Maui and Oahu tend to be slightly cooler. It’s worth noting microclimates when visiting different areas within the islands.
Typical August Rainfall in Hawaii
Rainfall Varies by Island
August is still part of Hawaii’s summer rainy season, but the rainfall starts to decrease compared to the peak months of March and April. However, there can be considerable variation across the different islands.
For example, Hilo on the Big Island receives around 9 inches of rain in August, while Honolulu on Oahu only gets around 1 inch. The windward sides of the islands tend to be wetter.
Kauai and Maui also see a mix of rain at this time of year. Interior and leeward areas stay drier than windward coasts. Daily rainfall is unpredictable and brief passing showers are common. Hilo sees rain, on average, 12-15 days each August.
Chance of Rain Overall Declines from Summer
The chance of rain declines in August compared to summer, but humidity remains high. By September, rainfall decreases more substantially as cooler and drier conditions start to develop. August is a transitional month, still with tropical warmth but with slightly lower rainfall probabilities.
Across the Hawaiian islands, the average August rainfall is 4-5 inches. But even a light passing shower can dampen an otherwise sunny day. It’s wise to be prepared with light rain jackets and umbrellas when visiting Hawaii in August.
Useful references:
Ocean Conditions Around Hawaii in August
Warmer Ocean Temperatures
The ocean temperatures around Hawaii begin to warm up in August as the summer season continues. According to the National Oceanic and Atmospheric Administration (NOAA), the average ocean temperature around Oahu in August is 81°F. This is quite pleasant for swimming and water activities.
The warmer waters bring increased numbers of sea turtles near the shores. Hawaiian green sea turtles bask in the sun in the turquoise waters. You may also spot some spinner dolphins jumping in the summer waves off the coast.
With more sea life visible, August is an excellent time to go snorkeling or scuba diving to explore Hawaii’s amazing biodiversity.
However, the higher ocean temperatures also bring the possibility of increased coral bleaching in sensitive areas. Organizations like Mālama Honua monitor for signs of coral stress during the hotter months.
Waves and underwater currents redistribute nutrients in the late summer, meaning ocean conditions can fluctuate.
Increased Wave Heights
The surf season begins picking up steam in August with increased wave heights, especially on north shores. On Oahu’s North Shore, the average wave height is around 6-10 feet, leading to great surfing conditions.
While the largest winter waves have yet to arrive, advanced surfers may seek out rides up to 20 feet high if conditions produce a good swell.
August marks the start of hurricane season in Hawaii. While the Hawaiian Islands are less prone to direct hurricane hits, increased storm activity in the Pacific can produce large swells even from distant weather events.
Surfers eagerly track the forecasts for hurricane swells arriving from thousands of miles away.
The larger waves mean most beachgoers stick to locations with gentler shorebreaks. August brings big waves and intense rip currents to iconic spots like Sandy Beach and Makapuʻu on Oahu. Lifeguards hoist yellow caution flags, warning inexperienced swimmers about hazardous conditions.
But with miles of coastline to choose from, more protected beaches and bays offer plenty of calm places to cool off in the summer sun.
What to Pack for Hawaii in August
Plan for Warm Weather
Hawaii in August is consistently warm, with average highs around 85°F. While the weather doesn’t vary much day-to-day, humidity levels can make it feel hotter some days. Packing lightweight, breathable clothing is key.
Bring Light, Breathable Clothing
Focus on natural fabrics like cotton and linen that won’t cling when humid. Tank tops, shorts, lightweight pants, sundresses, and open-weave shirts will keep you cool and comfortable. Having layers is handy for cooler nights or air-conditioned buildings.
A sun hat and sunglasses are great for shade when outdoors.
Prepare for Occasional Showers
The islands do get some rain in August, though usually brief afternoon showers. Packing a compact rain jacket and/or umbrella is wise. Still, having mostly dry weather means you can plan plenty of beach and outdoor time! With average water temperatures at 78°F, don’t forget your swimsuit.
Tips for Visiting Hawaii in August
Book Accommodations Early
August is one of the most popular times to visit Hawaii, so it’s crucial to book your hotel, condo, or vacation rental early to ensure availability and potentially save money. Prices spike in August for hotels and vacation rentals, so booking 4-6 months in advance can lead to significant savings over waiting until the last minute.
You’ll have the most options and best rates if you book no later than March or April.
Given how busy August is with families traveling in the summer, it’s also wise to book any activities, luaus, or other events you hope to attend well in advance. Waiting until you arrive in Hawaii may mean finding tours or events are sold out.
Avoid the Crowds
With kids out of school and clear sunny weather nearly every day, August is one of the most crowded months for popular destinations like Waikiki Beach, Pearl Harbor, and Haleakala National Park. Here are some pro tips for avoiding the masses:
Taking some or all of these steps will allow you to better enjoy Hawaii’s natural beauty with a little more breathing room.
Explore Lesser-Known Destinations
While the road to Hana and Waimea Canyon are incredible, the well-trodden tourist paths become packed in the busy month of August. Instead, head off the beaten trail to some under the radar gems. Here are three to consider:
| Destination | Description |
| Pololu Valley Lookout | Scenic viewpoint along the Kohala Coast of the Big Island offering gorgeous views of the northern shoreline. |
| Pua’ena Point Beach Park | Secluded white sand beach near Haleiwa on Oahu’s iconic North Shore. |
| Kapa’a Town | Laid back central town on Kauai with boutique shops, cafes, and beautiful beaches nearby. |
Venturing to lesser-known locales allows you to experience Hawaii’s charms away from the most popular spots swarming with visitors in August. You may have more room to sprawl out on the beach, find easier parking, and avoid long waits at restaurants.
Conclusion
With pleasant air temperatures, slightly cooler ocean conditions, lower chances of rain, and smaller crowds than the summer high season, August offers fantastic weather for a Hawaii vacation.
By packing breathable clothing you can layer on cooler nights, keeping an eye on island-specific forecasts, and avoiding the most popular destinations during peak times, you’ll be set up for an unforgettable Hawaiian escape. The aloha spirit awaits this August!
