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Sammamish, WA Weather
Sammamish, Washington sits at 47.5943, -122.0381. Its warmest month is July, when the day usually reaches 78F, and its coldest is January, when the night usually falls to 37F. January is the wettest, with rain on about 18 days. The hottest day in the station record is 109F on June 28, 2021, and the coldest night 14F on November 24, 2010. 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 Sammamish weather
Sammamish sits at 47.5943, -122.0381 and covers about 20.427 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 Sammamish
Sammamish is warmest in July, when the day usually reaches 78F, and coldest in January, when the night usually falls to 37F. January is the wettest month, with rain on about 18 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
48F
37F
18
February
50F
37F
16
March
54F
40F
18
April
59F
43F
14
May
66F
49F
11
June
71F
54F
9
July
78F
58F
4
August
78F
58F
5
September
72F
54F
9
October
61F
46F
15
November
52F
40F
17
December
47F
37F
17
Thirty-year normals, 1991 to 2020, computed from the daily record, measured at the Renton Muni Ap station 10.7 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.
Sammamish weather history, back to 1940
Pick any month back to 1940 and see what the archive holds for Sammamish: the reanalysis record of what happened, day by day.
Reading this month last year to start you off.
Sammamish weather records
In 28,691 days of observations Sammamish has been as hot as 109F and as cold as 14F. Not averages: the actual days.
Hottest day
109F
June 28, 2021
Coldest night
14F
November 24, 2010
Wettest day
4.48 in
October 20, 2003
Biggest snow
8.0 in
February 4, 2019
NOAA GHCN daily station records, observed 1998 to 2025: temperature at the Renton Muni Ap station, 10.7 miles away; snowfall at the Woodinville 0.9 Ene station, 11.3 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 Sammamish weather
Common questions
What is the weather usually like in Sammamish, WA?
Sammamish is warmest in July, when the day usually reaches 78F, and coldest in January, when the night usually falls to 37F. Rain falls on roughly 153 days a year, most often in January. Averages are thirty-year normals, 1991 to 2020, computed from the nearest NOAA station's own daily record.
How much does it rain in Sammamish, WA?
About 153 days a year see at least a hundredth of an inch, which is the Weather Service's measurable-precipitation mark. January is the wettest month with rain on about 18 of its days, and July the driest with about 4.
What is the hottest it has ever been in Sammamish, WA?
The hottest day measured for Sammamish reached 109F on June 28, 2021, and the coldest night 14F on November 24, 2010. Both are real NOAA station measurements from the GHCN daily archive, observed 1998 to 2025, at the Renton Muni Ap station. Not estimates, though the official state record may live at a different station.
Can I look up past weather for Sammamish, 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 Sammamish 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.