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At a Glance
30°F–45°F
Typical Summit Temp at Sunrise
Pre-dawn summit temperatures in all seasons routinely drop into the low 30s to mid-40s Fahrenheit — compounded by wind. The contrast with coastal Maui (70–80°F) is extreme and consistently surprises visitors who didn’t dress for it.
Apr–Oct
Most Reliable Clear Conditions
Summer and early fall offer the most consistently clear summit weather, with the trade wind inversion layer well-established and fewer winter storm systems. June–September is the sweet spot for both clear skies and warm crater hiking.
Nov–Mar
Higher Cloud & Rain Frequency
Winter months bring more frequent cloud cover, fog, and rain at the summit. Sunrise views are less reliable. The crater is still accessible and beautiful in winter, but clear morning views require more patience and luck.
Inversion
The Cloud Layer Advantage
Haleakalā’s summit rises above the trade wind inversion layer at ~6,000–8,000 ft. On clear days this creates the famous “sea of clouds” view — a solid white carpet below the summit while the crater is in brilliant sunshine.
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Month-by-Month Conditions
Jan–Feb Winter
Highest cloud frequency. Fog and rain at the summit more common. Cold and windy at sunrise — temperatures regularly near freezing. Crater accessible but less reliable for clear views. Crowds lighter; easier sunrise reservations.
March Transitional
Winter systems tapering. Clearing more frequent. Good mix of clear mornings and dramatic cloud seas below. Spring break brings higher visitor volume — book reservations early.
Apr–May Good
Spring transition to reliable clear conditions. Inversion layer strengthening. Excellent crater hiking weather — warm in the crater, clear summit views. Lower crowds than peak summer. Sunrise reservations easier than July–August.
Jun–Aug Prime
Best overall summit conditions. Inversion layer reliably established. Clearest sunrise probability of the year. Peak visitor season — sunrise reservations fill fastest; book at exactly the 60-day mark. Hot in crater midday.
Sep–Oct Excellent
Crowds thinning from summer peak. Conditions remain excellent. One of the best periods for the full crater traverse — cooler than August, still reliably clear. Slightly easier reservation access than peak summer.
Nov–Dec Variable
Early winter transition. Increasing cloud frequency and occasional storms. Still great visits on clear days. Thanksgiving and holiday periods bring visitor spikes — sunrise reservations fill again. Cold and wind increasing.
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Weather Hazards & Crater Conditions
| Condition | When | Impact | Response |
|---|---|---|---|
| Fog / cloud at summit | Any season; highest Nov–Mar | Obscures sunrise and views; reduces visibility on the road; limits crater visibility | Check the NWS summit forecast the evening before; cloud webcams on the observatory sites give real-time conditions |
| Wind at summit | Year-round; strongest in winter | Wind chill at the summit overlook can feel brutal — 35–55+ mph gusts are not unusual; cold exposure risk | Dress in full windproof shell regardless of season; the enclosed observation building provides refuge but is not always crowded access |
| Crater heat & UV | Peak summer midday | Inside the crater, reflective cinder amplifies solar radiation; UV intensity is extreme at 7,000–9,000 ft; heat can build quickly in sheltered areas | Start crater hikes early; carry sun protection; wear a hat inside the crater |
| Cold rain in crater | Nov–Mar; any season possible | A warm sunny descent into the crater can turn cold and wet rapidly if cloud moves in from the Ko’olau Gap; hypothermia risk without shell layer | Always carry a waterproof shell into the crater regardless of surface weather; the crater generates its own microclimate |
| Summit road fog at night | Any season | Driving up for sunrise through cloud and fog on an unfamiliar winding road is genuinely hazardous | Drive slowly on the summit road before dawn; headlights on, follow road markers, no rushing to beat other traffic |
The Best Haleakalā Visit Is a Clear-Forecast Day — Regardless of Month
Like Mauna Kea, Haleakalā rewards flexibility. A clear Tuesday in February beats a cloudy Saturday in July every time. The summit forecast is more predictive than the season calendar. Check the NWS point forecast for the summit elevation, look at the cloud webcams on the Haleakalā observatory websites the evening before your visit, and adjust your reservation strategy accordingly. Clear winter days on Haleakalā are spectacular — and much less crowded.
Acclimatization Schedule Builder
Plan your full visit day timeline — accounting for the 2 AM hotel departure for sunrise, time at the summit, and afternoon crater hiking if you’re combining both experiences.
Open Tool →Peak Comparison Tool
Compare Haleakalā’s weather window and summit conditions against Mauna Kea and other Hawaiian and Pacific volcanic summits.
Open Tool →National Weather Service
Haleakalā Summit Forecast
Official NWS point forecast for the Haleakalā summit area — check the high-elevation forecast specifically, not just the Kahului valley forecast, before every summit visit.
Visit Site ↗
Global Summit Guide
Mountain Weather for Climbers
How to interpret high-altitude forecasts, inversion layer behavior, and make go/no-go decisions based on summit-specific weather — with direct application to Haleakalā’s unique microclimate.
Read Guide →
All Haleakalā Guides
Disclaimer: Summit weather changes rapidly. Always check the NWS summit-specific forecast before your visit. This guide reflects general seasonal patterns, not guaranteed conditions.