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City of Sammamish, Washington climate
Csb Warm-summer Mediterranean
City of Sammamish has a seasonal cool-temperate climate (Warm-summer Mediterranean, Köppen Csb). The hottest month is July with an average daily high near 78°F, while the coldest is December averaging around 35°F at night. Precipitation totals about 40 inches a year and is strongly seasonal — November alone averages 6.2 inches while July barely receives 0.67 inches.
Temperature & precipitation
Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figuresClear vs cloudy days
Share of days each month that are clear, partly cloudy or cloudy · 1991–2020 · hover a month for the day countsCity of Sammamish climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°F) | 48 | 51 | 56 | 61 | 68 | 72 | 78 | 78 | 73 | 61 | 53 | 47 |
| Avg temp (°F) | 42 | 44 | 47 | 52 | 58 | 63 | 68 | 68 | 63 | 53 | 46 | 41 |
| Avg low (°F) | 36 | 36 | 39 | 43 | 49 | 53 | 57 | 57 | 52 | 46 | 39 | 35 |
| Precipitation (in) | 5.8 | 4.0 | 4.4 | 3.1 | 2.1 | 1.7 | 0.7 | 0.9 | 1.5 | 4.1 | 6.2 | 5.8 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°F) | 48 | 51 | 56 | 61 | 68 | 72 |
| Avg temp (°F) | 42 | 44 | 47 | 52 | 58 | 63 |
| Avg low (°F) | 36 | 36 | 39 | 43 | 49 | 53 |
| Precipitation (in) | 5.8 | 4.0 | 4.4 | 3.1 | 2.1 | 1.7 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°F) | 78 | 78 | 73 | 61 | 53 | 47 |
| Avg temp (°F) | 68 | 68 | 63 | 53 | 46 | 41 |
| Avg low (°F) | 57 | 57 | 52 | 46 | 39 | 35 |
| Precipitation (in) | 0.7 | 0.9 | 1.5 | 4.1 | 6.2 | 5.8 |
How often — frequency of weather events
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 17 | 15 | 16 | 14 | 10 | 8 | 4 | 4 | 7 | 13 | 18 | 17 |
| Days with high ≥ 90°F (days) | — | — | — | — | 0.1 | 0.5 | 2 | 1 | — | — | — | — |
| Days with low ≤ 32°F (days) | 9 | 8 | 4 | 0.5 | 0.0 | — | — | — | 0.0 | 0.6 | 6 | 10 |
| Days with snowfall ≥ 1 in (days) | 0.0 | 0.2 | — | — | — | — | — | — | — | — | 0.0 | 0.2 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 17 | 15 | 16 | 14 | 10 | 8 |
| Days with high ≥ 90°F (days) | — | — | — | — | 0.1 | 0.5 |
| Days with low ≤ 32°F (days) | 9 | 8 | 4 | 0.5 | 0.0 | — |
| Days with snowfall ≥ 1 in (days) | 0.0 | 0.2 | — | — | — | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 4 | 4 | 7 | 13 | 18 | 17 |
| Days with high ≥ 90°F (days) | 2 | 1 | — | — | — | — |
| Days with low ≤ 32°F (days) | — | — | 0.0 | 0.6 | 6 | 10 |
| Days with snowfall ≥ 1 in (days) | — | — | — | — | 0.0 | 0.2 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 76 | 72 | 74 | 73 | 69 | 66 | 48 | 48 | 51 | 66 | 75 | 75 |
| Clear days (≤ 30% cloud) | 3 | 4 | 3 | 3 | 4 | 4 | 11 | 11 | 10 | 5 | 3 | 2 |
| Partly cloudy days (30–70%) | 7 | 7 | 6 | 8 | 8 | 9 | 10 | 10 | 9 | 9 | 6 | 7 |
| Cloudy days (≥ 70%) | 22 | 18 | 22 | 19 | 19 | 17 | 10 | 10 | 11 | 17 | 21 | 21 |
| Relative humidity (%) | 90 | 87 | 85 | 82 | 80 | 80 | 78 | 76 | 77 | 83 | 89 | 90 |
| Wind speed (mph) | 1.9 | 1.8 | 1.9 | 1.7 | 1.4 | 1.3 | 1.2 | 1.2 | 1.4 | 1.7 | 1.9 | 1.9 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 76 | 72 | 74 | 73 | 69 | 66 |
| Clear days (≤ 30% cloud) | 3 | 4 | 3 | 3 | 4 | 4 |
| Partly cloudy days (30–70%) | 7 | 7 | 6 | 8 | 8 | 9 |
| Cloudy days (≥ 70%) | 22 | 18 | 22 | 19 | 19 | 17 |
| Relative humidity (%) | 90 | 87 | 85 | 82 | 80 | 80 |
| Wind speed (mph) | 1.9 | 1.8 | 1.9 | 1.7 | 1.4 | 1.3 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 48 | 48 | 51 | 66 | 75 | 75 |
| Clear days (≤ 30% cloud) | 11 | 11 | 10 | 5 | 3 | 2 |
| Partly cloudy days (30–70%) | 10 | 10 | 9 | 9 | 6 | 7 |
| Cloudy days (≥ 70%) | 10 | 10 | 11 | 17 | 21 | 21 |
| Relative humidity (%) | 78 | 76 | 77 | 83 | 89 | 90 |
| Wind speed (mph) | 1.2 | 1.2 | 1.4 | 1.7 | 1.9 | 1.9 |
Methodology & sources
Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Kent (NOAA GHCN station USC00454169), about 26 km from the city centre.
Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.