Last updated March 31, 2026
Haleakalā Summit Temps & Prime Clear-Weather Months
Month-by-Month Conditions
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 |
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.
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Global Summit Guide is an independent mountaineering resource founded in 2026. The team combines first-hand trekking and climbing experience with in-depth research and professional health and nutrition review to help climbers choose objectives, prepare properly, and stay safe.
Health, altitude, and nutrition content is reviewed by Taylor Ludlow (Registered Nurse) and Brigg Hoopes (Nutritionist).
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