September is considered a transition month for travel to Hawaii, blending summer’s warm weather with the benefits of the shoulder season. Following the peak summer rush, this period offers an appealing balance for visitors seeking a less crowded and potentially more affordable experience. The traditional family vacation season ends by September, shifting the atmosphere on the islands.
September Weather Profile and Ocean Conditions
September generally represents the conclusion of the islands’ warm and dry summer, maintaining high temperatures and minimal rainfall across the archipelago. Daytime high temperatures commonly reach around 86°F (30°C), with the cooling effects of the northeast trade winds helping to moderate the air’s humidity. The average statewide rainfall during this month is typically less than four inches, as the wetter season does not generally begin until November.
Ocean conditions in September are particularly favorable for water activities, with sea surface temperatures often reaching their annual peak, averaging around 81°F (27°C). This warmth makes swimming, snorkeling, and diving especially comfortable across all islands. Surf conditions remain relatively small on the North Shores, which historically see their massive waves during the winter months, while the South Shores maintain the gentler, summer-like conditions.
The Central Pacific hurricane season peaks between July and September, meaning September falls within the period of highest tropical storm risk. While a direct hurricane landfall is rare—the last major one occurred in 1992—travelers should note the possibility of tropical systems approaching the islands. These systems can bring heavy rain and high surf, but Hawaii’s geographic location and cooler deep ocean trenches often cause them to weaken or divert before reaching the islands.
A specific late-summer consideration, particularly for the Big Island, is the potential for Vog, or volcanic smog, which is a hazy mixture of sulfur dioxide ($\text{SO}_2$) gas and fine aerosols. The prevailing trade winds, which blow 80-95% of the time from May through September, can push this volcanic pollution from Kīlauea toward the leeward side of the island, including the Kona coast. Vog concentrations can fluctuate based on volcanic activity and wind direction, creating a temporary air quality concern for some visitors.
The Advantage of Lower Crowds and Costs
Following the Labor Day holiday weekend, Hawaii experiences a noticeable drop in tourism volume as schools resume across the mainland United States. This marks the beginning of the “shoulder season,” where the number of visitors decreases significantly compared to the high-traffic summer months. The reduction in crowds translates to less congestion at popular attractions, shorter wait times for restaurants, and greater availability for tours and activities.
This decline in demand also corresponds with a decrease in the average pricing for travel-related expenses, making September a more cost-effective choice for many travelers. Both airfare and lodging prices tend to soften after the summer peak, providing an economic benefit to those who are budget-conscious. Some data shows hotel rates in months like September can be substantially lower than those seen during the busiest winter holiday periods.
The diminished crowds contribute to a more relaxed and less tourist-centric atmosphere across the islands. Beaches and hiking trails, which can be packed during peak season, become noticeably quieter, offering a more tranquil experience. Finding available rental cars and booking last-minute activities becomes less challenging during this period.
Unique September Events and Local Atmosphere
September offers several unique cultural and sporting events that provide a deeper connection to the local Hawaiian atmosphere. The most prominent is the Aloha Festivals, a month-long, statewide celebration of Hawaiian culture, history, and customs. These festivals typically feature events like the Floral Parade with its pa‘u riders, street parties, and various cultural performances.
On the Island of Hawaii, the Queen Lili‘uokalani Canoe Races are a major annual event that attracts teams from around the world for a prestigious long-distance outrigger competition held in Kailua-Kona. September also marks the start of the Kona Coffee Harvest Season, allowing visitors to tour local farms and sample some of the freshest coffee available. These local events foster an atmosphere that feels less focused on mass tourism and more centered on island traditions.
Beyond the major festivals, many smaller, community-focused events take place on islands like Maui and Oahu, including local food and music experiences or hula competitions. These gatherings, combined with the decreased tourist volume, allow for a greater immersion into the daily life and rhythm of the islands.