Haleakalā National Park (Wilderness Tent Permit)
Tonight: low 52 °F, heavy dew, rain likely, breezy.
Tonight
Worth a lookFriday, September 25, 10 p.m. to 7 a.m.
Your selected gear looks warm enough
About 15 °F to spare at the coldest hour.
This is based on typical values for the gear types you picked, so treat it as an estimate.
Your night
- 10 p.m. until morningComfortableAir around you 57 to 54°F, heavy dew, gusty, rain likely (up to 28 mph).
Every hour
- 10 p.m.57°Fcomfortable, heavy dew, gusty, rain likely
- 11 p.m.57°Fcomfortable, some dew, gusty, rain likely
- midnight56°Fcomfortable, some dew, gusty, rain likely
- 1 a.m.56°Fcomfortable, some dew, gusty, rain likely
- 2 a.m.56°Fcomfortable, some dew, gusty, rain likely
- 3 a.m.55°Fcomfortable, heavy dew, rain likely
- 4 a.m.55°Fcomfortable, heavy dew, rain likely
- 5 a.m.55°Fcomfortable, some dew, rain likely
- 6 a.m.54°Fcomfortable, heavy dew, rain likely
- 7 a.m.55°Fcomfortable, heavy dew, gusty, rain likely
This spot sits about 18 m below the land around it. On clear, calm nights cold air pools here, so expect it colder and wetter than the forecast.
Times are local time at your spot (GMT-10).
What works tonight
The gear this night calls for, for someone who sleeps like you.
- You have this
Sleeping bag
Comfort 50°F or colder
Usually sold as a 41° bag. The number in a bag's name is the limit, not the comfort.
- You have this
Underneath you
R1 or more
The R-value says how well a pad keeps the cold ground out.
Before you sleep
- Stake out every guyline and point the low, narrow end of the tent into the wind.
- Rain is possible from about 10 p.m. Keep the rain fly on and bring shoes and packs inside.
- Bring shoes, clothes and electronics inside. Anything left out will be wet by morning.
- Open the tent vents and keep the door zip open a bit at the top. Some condensation inside is normal on a night like this, so bring a small towel to wipe it off.
How we estimated this
At the coldest hour (6 a.m.):
- Outside at your spot
- 52°F
- Warmth your shelter holds
- +2 °F
- Air around you
- 54°F
- Your bag's comfort rating
- 39°F
- Your comfort limit
- 39°F
15 °F to spare, so warm enough.
Assumptions
- Bag categories use typical ratings as sold: summer about 50 °F (10 °C), 3-season about 30 °F (-1 °C), winter about 15 °F (-9 °C). The number in a bag's name is usually its lower limit, so its comfort rating is about 9 °F (5 °C) warmer.
- What you lie on: foam mat about R2, thin air pad about R1.5, insulated pad about R3.5, winter pad R5 and up, van bed about R4, air mattress about R0.5. Colder ground needs a higher R-value.
- Shelters hold a few degrees early in the night and less towards morning. Wind and clear, calm skies take warmth away.
- Weather: Open-Meteo forecast for your spot, on a grid of a few kilometers, corrected to its height.
- These are rules of thumb, not measurements. People and gear vary.
A forecast, not a promise. Mountains, valleys and water make their own weather, so trust what you see and feel on site. Terms and liability
Checked for a double-wall tent, a 3-season bag and a thin air pad. Check your own gear here.
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