Current Conditions
Temp2.5 C
RH96 %
WindSSW 18 mph
Road Status: Closed

Monday, October 23, 2017 - 08:43 p.m.


The access road remains closed to the public at the 9,200 foot level due to steady rains, turning to hail and sleet, due to a thunderstorm across the summit, steadily dropping temperatures, high humidity and increasing winds. This message will be updated after further checks are made and as conditions change.

Thank you for your patience and understanding.

Maunakea Rangers

This announcement is primarily used to inform the public about road closures. Road closures typically occur during winter months due to ice or snow on the road and occasionally for high wind situations. Specific road closure criteria are listed below:

1. Any ice or snow on the road.
2. Winds greater than 55 mph for more than 1 hour and/or gusts greater than 65mph.
3. Visibility less than 50 feet.
4. Any emergent condition that makes the road unsafe for travel.

There are very few road closures from April 1 through November 30, and this message will not be updated during this time period unless unusual circumstances develop.

The rest of this website is regularly updated with the summit weather forecast and is a useful source of current Mauna Kea weather conditions.

More Information: Mauna Kea weather varies widely. A calm sunny day may quickly become treacherous with hurricane force winds and blizzard conditions. Summit winds above 120 mph are not uncommon. Snowstorms have even occurred during the summer months.

When conditions are too dangerous, the Summit Access road is closed at the Visitor Information Station to ensure everyone's safety. The road is re-opened as soon as the weather and the roads are safe again.

Traffic delays and road closures on the summit access road may also occur due to the use and transport of heavy equipment, slow vehicle movements, deliveries, road maintenance, stalled or abandoned vehicles, hikers and bikers. Remember that dust, fog or snow can reduce visibility and slow traffic. Specific road closure criteria is listed below:

1. Any ice or snow on the road.
2. Winds greater than 55 mph for one hour and/or gusts greater than 65 mph.
3. Visibility less than 50 feet.
4. Any emergent condition that makes the road unsafe for travel.

Mahalo for your understanding.

Public road conditions and snow report message: (808) 935-6268
Summit Weather via the CFHT/GEMINI WX Tower and SUBARU

Most Recent Previous 24 hours Options

Oct 23 2017, 21:55 HST Minimum Maximum UTC | HST
Temperature 2.5 oC -1.7 oC @ 00:54 5.3 oC @ 13:50 oC | K | F
Wind Chill -2.9 oC -11.0 oC @ 01:29 2.8 oC @ 15:33 oC | K | F
Relative Humidity 96% 15% @ 21:47 96% @ 21:38
Pressure 616 mb 616 mb @ 18:49 620 mb @ 22:28
Wind speed 18 mph 1 mph @ 15:32 41 mph @ 01:29 mph | Kts | m/s
Wind direction 202 o

dir | deg
Precipitation (as of 8 am) 0.00 mm

mm | inches
Fog Imminent

Random Web Cams

Subaru Cat Walk (Aimed South)

MLO Solar Radiation Deck (Aimed East)


Check the MKWC Current Obs page for additional weather observations and the MKWC Web Cams page for more mountain cams.
Latest Mountain Warnings and Forecasts

Current MKWC Warning(s) - (Latest Forecast)
Fog, high humidity and ice
Thunderstorms and snow are also likely
Strong/increasing winds
Current HNL NWS Mountain Bulletin(s) - (Latest Forecast)
Non-Precipitation Warning
Additional Information

Visiting Mauna Kea Observatories Information
Road is always closed the morning after a snowfall.
Road is always closed while snow removal equipment is in operation.
Road is closed when the pavement has ice/snow.
Snow removal equipment can only remove snow. Thermal heating is needed to remove the final layer of ice that usually forms under the snow.
Other information for visitors to Mauna Kea.