Sammamish weather
Loading live data…Cloudy,rain likely tomorrow
NWS, the American and the European model put Sammamish's high today between 55° and 61°, a 6° split. Tomorrow: light drizzle, around 56°, with a 45% chance of rain.
Latest for Sammamish: NWS (National Blend (NBM)): 39° Partly cloudy · American (NOAA GFS): 37° Clear · European (ECMWF): 36° Overcast.
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Sammamish weather in numbers
measured normals and 10 years of recorded weatherSammamish swings 46°F across the year, from 78°F highs in July to 32°F lows in December, and November is usually the wettest month in a year that brings about 52 in of precipitation. Over 10 years of recorded weather it averages 48 days a year at 77°F or above, 10 of them at 86°F or above, 54 frost nights, and rain on 172 days.
Day counts are from the ERA5 reanalysis for Sammamish’s grid square, 2016 to 2025, counted the same way for every city so the numbers compare. A reanalysis square is an area, not a weather station, so it is good for counting days and not for a single day’s record.
The weather map: all three models at once
NWS, American, European side by side around Sammamish and nearby towns.Live rain radar →Sammamish hourly forecast: next 14 hours
consensus of the three modelsRain in the next 24 hours, model by model
each model's own hourly precipitation, side by sideLoading the three models…
Sammamish 10-day forecast, out to 14 days
where the models agree, and where they splitSammamish, Washington (WA) is at its warmest in Jul (average highs near 78°F) and coldest in Dec (lows around 32°F), with roughly 52 in of precipitation across the year. Below, compare what NWS, American, European forecast for Sammamish right now, and see exactly where they disagree.
We grade every model against the weather that actually happened, so you can see which forecast model is most accurate in United States before you trust any single number.
Sammamish climate by month
average daytime high and overnight low across a typical year (1991-2020)Source: 1991-2020 averages, ERA5 for this place adjusted with NASA POWER.
How the weather around Sammamish has changed since 1995
Sammamish sits in the same roughly 50 km square of NASA's reanalysis as Redmond. That square shows no clear change in temperature between 1995-2004 and 2015-2024. See the full 30-year picture on the Redmond page.
Which forecast is most accurate in Sammamish?
CheckWeather Score, graded against the weather that actually happened
The CheckWeather Score blends temperature, wind and rain accuracy, each measured against ERA5 (the recorded weather) over the last 30 days across 1999 cities. Lower error means a higher score. See which forecast model is most accurate in United States, how we measure forecast accuracy, or which model each weather app uses.
What do you think of the forecasts?
your vote countsThe accuracy above is the measured record. This is your opinion: which forecast service do you trust most in United States? Give each 1 to 5 stars.
One vote per service. Anonymous: we store no personal data, only a one-way hash of your connection for a day to stop double votes.
Where the models disagree
temperature and rain, judged separatelyThe models often agree on temperature and still split on rain, and rain is usually what decides whether a plan survives. A wide rain range means the shower is genuinely uncertain, not that the forecast is wrong.