Cumberland Island National Seashore Camping Permits
Tonight: low 54 °F, heavy dew.
Nights by month
Night lows from 2016 to 2025: a typical night, and the cold one that comes 1 night in 10.
The mildest nights are in August, typically 76°F. The coldest are in January, when 1 night in 10 drops to 35°F. Frost is rare all year.
- Jan47°F 35°FBag comfortable to 35°F · frost 6% · rain or snow 22% of days
- Feb54°F 43°FBag comfortable to 45°F · frost 0% · rain or snow 29% of days
- Mar58°F 46°FBag comfortable to 45°F · frost 0% · rain or snow 28% of days
- Apr63°F 53°FBag comfortable to 55°F · frost 0% · rain or snow 27% of days
- May70°F 62°FBag comfortable to 60°F · frost 0% · rain or snow 38% of days
- Jun74°F 71°FBag comfortable to 70°F · frost 0% · rain or snow 63% of days
- Jul76°F 74°FBag comfortable to 75°F · frost 0% · rain or snow 67% of days
- Aug76°F 74°FBag comfortable to 75°F · frost 0% · rain or snow 80% of days
- Sep (this month)74°F 69°FBag comfortable to 70°F · frost 0% · rain or snow 58% of days
- Oct69°F 57°FBag comfortable to 55°F · frost 0% · rain or snow 36% of days
- Nov58°F 47°FBag comfortable to 45°F · frost 0% · rain or snow 25% of days
- Dec53°F 40°FBag comfortable to 40°F · frost 1% · rain or snow 25% of days
| = 32°F
History: ERA5 and ERA5-Land reanalysis via Open-Meteo, corrected to the site's elevation. Bag rating: the comfort rating that keeps you warm in a tent on 9 of 10 nights that month.
Tonight
Good nightFriday, 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 68 to 54°F, heavy dew from 6 a.m.
Every hour
- 10 p.m.68°Fcomfortable, some dew
- 11 p.m.66°Fcomfortable, some dew
- midnight64°Fcomfortable, some dew
- 1 a.m.62°Fcomfortable, some dew
- 2 a.m.60°Fcomfortable, some dew
- 3 a.m.59°Fcomfortable, some dew
- 4 a.m.58°Fcomfortable, some dew
- 5 a.m.57°Fcomfortable, some dew
- 6 a.m.55°Fcomfortable, heavy dew
- 7 a.m.54°Fcomfortable, heavy dew
Times are local time at your spot (GMT-4).
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
- 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 (7 a.m.):
- Outside at your spot
- 54°F
- Warmth your shelter holds
- +2 °F
- Clear-sky cooling
- −1 °F
- Air around you
- 55°F
- Your bag's comfort rating
- 39°F
- Your comfort limit
- 39°F
16 °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.