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Marblemount, WA Weather
Marblemount, Washington sits at 48.5418, -121.4396. Its warmest month is August, when the day usually reaches 79F, and its coldest is January, when the night usually falls to 32F. March is the wettest, with rain on about 21 days. The hottest day in the station record is 105F on June 28, 2021, and the coldest night 4F on January 12, 2024. This page carries live conditions, an hour by hour timeline, a ten day outlook, radar, monthly averages and searchable daily history back to 1940.
About Marblemount weather
Marblemount sits at 48.5418, -121.4396 and covers about 3.702 square miles. The forecast above is live: current conditions lead with the HRRR model, corrected against the nearest reporting station and against radar overhead, because a model can lag a storm and the radar cannot.
The tabs at the top of this page carry the hour by hour timeline, the ten day outlook and live radar. Where the models disagree about a day, the rock says so on the day rather than quietly picking a winner.
The rock grades itself against what actually happened and publishes the result whether it flatters it or not. Those standings live in the Receipts.
Where these numbers come from
Current conditions and forecast: NOAA forecast grids (the National Weather Service digital forecast, the National Blend of Models, HRRR and GFS) decoded on our own server, corrected against the nearest reporting station and our own radar. Open-Meteo is consulted only as a fallback when our server is silent.
Radar: NOAA MRMS merged reflectivity, rendered into tiles by myweatherrock.
Monthly averages and records: computed by myweatherrock from NOAA GHCN-Daily station records at the nearest qualifying station, named on this page with its distance. Measurements, not estimates.
Daily history search: the town's own NOAA GHCN-Daily station file, held on our server, measurements by day. Months the station missed fall back to the Open-Meteo historical archive (reanalysis), and the page says so when it does.
What the weather is usually like in Marblemount
Marblemount is warmest in August, when the day usually reaches 79F, and coldest in January, when the night usually falls to 32F. March is the wettest month, with rain on about 21 days of it.
Usual high and low, by month
Days with rain, by month
The same year as numbers
Month
Usual high
Usual low
Rain days
January
42F
32F
20
February
45F
32F
17
March
51F
34F
21
April
58F
38F
17
May
67F
44F
14
June
70F
49F
13
July
78F
52F
7
August
79F
52F
6
September
70F
48F
11
October
58F
42F
17
November
47F
35F
20
December
41F
32F
20
Thirty-year normals, 1991 to 2020, computed from the daily record, measured at the Darrington 21 Nne station 0.3 miles away. A rain day means at least a hundredth of an inch fell, the same measurable-precipitation mark the Weather Service uses. Source: computed from the station record, NOAA GHCN daily.
Marblemount weather history, back to 1940
Pick any month back to 1940 and see what the archive holds for Marblemount: the reanalysis record of what happened, day by day.
Reading this month last year to start you off.
Marblemount weather records
In 23,766 days of observations Marblemount has been as hot as 105F and as cold as 4F. Not averages: the actual days.
Hottest day
105F
June 28, 2021
Coldest night
4F
January 12, 2024
Wettest day
5.33 in
January 7, 2009
Biggest snow
24.0 in
January 1, 1966
NOAA GHCN daily station records, observed 2003 to 2025: temperature at the Darrington 21 Nne station, 0.3 miles away; snowfall at the Newhalem station, 12.9 miles away. Station measurements, not estimates. Record dates reflect the station's own observation schedule, and the official state record may live at a different station.
Common questions about Marblemount weather
Common questions
What is the weather usually like in Marblemount, WA?
Marblemount is warmest in August, when the day usually reaches 79F, and coldest in January, when the night usually falls to 32F. Rain falls on roughly 183 days a year, most often in March. Averages are thirty-year normals, 1991 to 2020, computed from the nearest NOAA station's own daily record.
How much does it rain in Marblemount, WA?
About 183 days a year see at least a hundredth of an inch, which is the Weather Service's measurable-precipitation mark. March is the wettest month with rain on about 21 of its days, and August the driest with about 6.
What is the hottest it has ever been in Marblemount, WA?
The hottest day measured for Marblemount reached 105F on June 28, 2021, and the coldest night 4F on January 12, 2024. Both are real NOAA station measurements from the GHCN daily archive, observed 2003 to 2025, at the Darrington 21 Nne station. Not estimates, though the official state record may live at a different station.
Can I look up past weather for Marblemount, WA?
Yes, and for free. The History tab on this page takes any month back to 1940 and shows every day of it: the high, the low, what fell, and that month's hottest and coldest day. No account and no payment.
Is the Marblemount forecast on this page free, and does it track me?
It is free, carries no advertising, and needs no account. Nothing about a visitor leaves the device except the coordinates needed to fetch a forecast, and those are not stored against anyone.