Kapaa, HI 96746 Weather Forecast
Kapaa, Hawaii Weather Guide & Climate Overview
Climate Overview
Kapaa, Hawaii (96746) experiences a tropical climate with warm temperatures year-round, high humidity, and a distinct wet and dry season. Average highs stay between 80–90°F throughout the year, with winter lows rarely dipping below 60°F. Annual rainfall averages 50–65 inches, concentrated in the summer wet season from June through October. Trade winds provide some relief from the heat, and tropical storms and hurricanes are a seasonal concern. The UV index remains high year-round, making sun protection essential.
Hawaii Weather Challenges
- Flash flooding from intense tropical rainfall
- Hurricane season threats in summer and fall
- Trade wind disruptions affecting local weather patterns
Seasonal Weather Guide
Spring (Mar–May)
California warms into the 70s°F while the Pacific Northwest remains cool and rainy with temperatures in the 50s–60s°F. The Central Valley and Sierra foothills explode with wildflower blooms, especially California poppies. Marine layer fog keeps coastal areas 10–15°F cooler than inland. Snowpack in the Sierra Nevada and Cascades begins melting, feeding rivers and reservoirs. Whale migration along the coast provides excellent viewing opportunities. Late spring is ideal for wine country visits.
Summer (Jun–Aug)
Dry and warm in California with coastal temperatures in the 65–75°F range (thanks to marine fog) and inland valleys reaching 95–110°F. The Pacific Northwest enjoys its best weather with sunny skies, low humidity, and temperatures in the 75–85°F. Wildfire season intensifies from July onward — smoke from regional fires can degrade air quality for weeks. Ocean water temperatures reach 60–68°F for surfing and swimming. Outdoor concerts, farmers markets, and hiking season are at their peak.
Fall (Sep–Nov) (Current)
September and October are often the warmest months in the Pacific Northwest and coastal California as marine fog retreats. Peak wildfire and Santa Ana/Diablo wind season creates dangerous fire weather in October and November — have a go-bag ready in fire-prone areas. Atmospheric rivers begin returning to the Pacific Northwest in November, sometimes bringing 4–6 inches of rain in a single event. Fall color peaks along the Columbia River Gorge in October. Harvest festivals and wine crush season draw visitors.
Winter (Dec–Feb)
Rainy season brings 60–80% of the annual precipitation with atmospheric rivers capable of dumping 5–10 inches of rain in 24–48 hours, causing mudslides and flooding. Mountain snow builds the crucial snowpack that supplies water through summer — the Sierra Nevada can receive 30+ feet of total snowfall. Coastal temperatures remain mild in the 50s–60s°F. King tides cause coastal flooding in December and January. Excellent season for storm watching along the Oregon and Washington coasts.
Outdoor Activities
Warm and dry conditions are great for road biking, mountain biking, or a casual neighborhood ride. Bring water and sunscreen for longer rides.
The Pacific coast offers year-round surfing from Huntington Beach to Santa Cruz to Tofino. Water temperatures range from the low 50s to upper 60s°F — wetsuits are standard gear north of Malibu.
Coastal cliffs, redwood forests, volcanic peaks, and alpine meadows provide incredibly diverse terrain. The Pacific Crest Trail, Muir Woods, and Olympic National Park are bucket-list destinations.
Napa Valley, Sonoma, Willamette Valley, and Paso Robles offer world-class wine tasting with beautiful scenery. Cycling between vineyards is a popular activity in fair weather.
Gray whales migrate along the coast December through April, and humpback whales feed offshore from May through November. Boat tours and coastal viewpoints offer excellent sighting opportunities.
What Is the Weather Like in Kapaa, Hawaii?
The weather in Kapaa, Hawaii right now is 86°F and clear, feeling like 97°F. Today expect a high of 88°F and a low of 75°F with a slight chance of rain (34%). Winds are calm at 4 mph with moderate humidity at 62%.
What Should I Wear in Kapaa Today?
Wear lightweight, loose-fitting clothing in light colors. Stay hydrated and limit time in direct sun. UV is high — sunscreen, sunglasses, and a hat are essential.