July is one of the warmer months of the year in Sammamish, with average highs near 21.6°C and lows around 11.6°C (mean 16.6°C). It is one of the drier months, averaging 36 mm of rainfall and 78% relative humidity across the period.
July is one of the warmer months of the year in Sammamish. Across 45 years of records, the warmest July in Sammamish was 1985 — when the month averaged 18.9°C — while the coldest was 1993 at 13.5°C. Typical July days reach 21.6°C with nights near 11.6°C. The long-term trend is warming, about 0.3°C per decade.
July is one of the drier months in Sammamish, averaging 36 mm of rainfall. The wettest July on record was 1983 with 140 mm, while the driest was 2017 at 4 mm.
Relative humidity in Sammamish during July averages 78%. The most humid July was 1993 at 87%, and the least humid was 1985 at 71%.
July receives about 6.2 kWh/m²/day of solar energy in Sammamish. The sunniest July was 2023 at 7.2 kWh/m²/day, and the cloudiest was 1993 at 4.5.
Average wind speed in Sammamish during July is 0.3 m/s. The windiest Julys were 2022, 2023 and 2024, among others at 0.3 m/s, while the calmest were 2012, 2016 and 2025, among others at 0.2 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 15.7°C | 16.7°C | 16.9°C | 16.8°C | 17.2°C | +1.5°C |
| Avg High | 20.7°C | 21.5°C | 21.9°C | 21.7°C | 22.3°C | +1.6°C |
| Avg Low | 10.6°C | 11.8°C | 11.8°C | 11.8°C | 12.0°C | +1.4°C |
| Avg Rain | 50 mm | 51 mm | 28 mm | 27 mm | 21 mm | -29 mm |
July temperatures in Sammamish have risen by about 1.2°C between 1981–1985 and 2021–2025.
July has ranged from a record low of 3.4°C (2025) to a record high of 37.8°C (2006).
Rainfall in July is one of the drier months, averaging 36 mm, with a wettest year of 140 mm.
One of the best times to visit Sammamish
July is one of the best times to visit Sammamish. Expect days averaging 21.6°C and nights around 11.6°C (mean 16.6°C) — warmer than Sammamish's yearly average — with moderate rainfall (36 mm), so conditions are generally comfortable for sightseeing and outdoor plans.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 19.8°C | 14.7°C | 9.6°C | 26.5°C | 3.4°C | 33 mm | 83% | 0.2 m/s | 6.9 |
| 2024 | 23.6°C | 18.3°C | 12.9°C | 32.7°C | 8.1°C | 25 mm | 75% | 0.3 m/s | 7.1 |
| 2023 | 23.0°C | 17.7°C | 12.4°C | 30.4°C | 9.6°C | 11 mm | 76% | 0.3 m/s | 7.2 |
| 2022 | 23.4°C | 18.2°C | 12.9°C | 33.0°C | 8.2°C | 22 mm | 77% | 0.3 m/s | 6.5 |
| 2021 | 23.1°C | 18.0°C | 12.8°C | 32.5°C | 8.6°C | 7 mm | 76% | 0.3 m/s | 6.8 |
| 2020 | 21.0°C | 16.1°C | 11.2°C | 33.6°C | 8.0°C | 29 mm | 80% | 0.3 m/s | 6.2 |
| 2019 | 20.8°C | 16.2°C | 11.7°C | 31.9°C | 7.9°C | 32 mm | 80% | 0.3 m/s | 5.5 |
| 2018 | 24.0°C | 18.4°C | 12.9°C | 33.1°C | 7.4°C | 10 mm | 72% | 0.3 m/s | 7 |
| 2017 | 21.6°C | 16.5°C | 11.4°C | 26.1°C | 8.6°C | 4 mm | 78% | 0.3 m/s | 7.1 |
| 2016 | 20.1°C | 15.9°C | 11.6°C | 26.5°C | 9.4°C | 47 mm | 83% | 0.2 m/s | 5.6 |
| 2015 | 23.8°C | 18.7°C | 13.6°C | 31.7°C | 10.3°C | 20 mm | 71% | 0.3 m/s | 6.6 |
| 2014 | 23.0°C | 17.9°C | 12.7°C | 29.7°C | 9.0°C | 44 mm | 78% | 0.3 m/s | 6.6 |
| 2013 | 22.4°C | 17.3°C | 12.2°C | 31.1°C | 9.7°C | 5 mm | 77% | 0.3 m/s | 6.8 |
| 2012 | 20.7°C | 16.1°C | 11.4°C | 27.6°C | 8.0°C | 49 mm | 83% | 0.2 m/s | 5.8 |
| 2011 | 19.0°C | 14.4°C | 9.8°C | 26.2°C | 6.9°C | 43 mm | 82% | 0.3 m/s | 5.7 |
| 2010 | 21.6°C | 16.1°C | 10.7°C | 35.6°C | 6.2°C | 20 mm | 78% | 0.3 m/s | 6.5 |
| 2009 | 24.2°C | 18.7°C | 13.2°C | 34.4°C | 8.2°C | 13 mm | 74% | 0.3 m/s | 6.6 |
| 2008 | 20.5°C | 15.6°C | 10.7°C | 31.3°C | 6.4°C | 32 mm | 79% | 0.3 m/s | 6.2 |
| 2007 | 22.3°C | 17.3°C | 12.2°C | 33.0°C | 8.8°C | 38 mm | 81% | 0.3 m/s | 6 |
| 2006 | 22.3°C | 17.6°C | 12.9°C | 37.8°C | 8.9°C | 21 mm | 76% | 0.3 m/s | 6.4 |
| 2005 | 21.6°C | 16.5°C | 11.4°C | 28.4°C | 8.5°C | 41 mm | 79% | 0.3 m/s | 6.4 |
| 2004 | 23.4°C | 18.1°C | 12.8°C | 33.9°C | 8.4°C | 19 mm | 77% | 0.3 m/s | 6.3 |
| 2003 | 22.7°C | 17.5°C | 12.2°C | 30.2°C | 7.5°C | 7 mm | 74% | 0.3 m/s | 7.1 |
| 2002 | 22.1°C | 16.8°C | 11.4°C | 31.8°C | 6.8°C | 31 mm | 78% | 0.3 m/s | 6.3 |
| 2001 | 20.0°C | 15.2°C | 10.3°C | 33.0°C | 8.1°C | 41 mm | 79% | 0.2 m/s | 6.1 |
| 2000 | 19.9°C | 15.4°C | 10.8°C | 27.7°C | 6.8°C | 36 mm | 82% | 0.3 m/s | 5.8 |
| 1999 | 20.5°C | 15.5°C | 10.5°C | 30.9°C | 5.7°C | 54 mm | 80% | 0.2 m/s | 6.2 |
| 1998 | 22.9°C | 18.3°C | 13.7°C | 34.0°C | 10.1°C | 28 mm | 80% | 0.3 m/s | 5.9 |
| 1997 | 20.9°C | 16.1°C | 11.2°C | 32.4°C | 8.4°C | 67 mm | 81% | 0.3 m/s | 6.4 |
| 1996 | 23.2°C | 17.9°C | 12.6°C | 33.3°C | 5.6°C | 39 mm | 76% | 0.3 m/s | 6.6 |
| 1995 | 21.2°C | 16.6°C | 11.9°C | 29.6°C | 7.6°C | 60 mm | 80% | 0.3 m/s | 5.6 |
| 1994 | 22.5°C | 17.2°C | 11.8°C | 35.1°C | 7.1°C | 29 mm | 74% | 0.3 m/s | 6.4 |
| 1993 ❄️ | 17.5°C | 13.5°C | 9.6°C | 22.4°C | 7.0°C | 105 mm | 87% | 0.2 m/s | 4.5 |
| 1992 | 21.8°C | 17.1°C | 12.5°C | 31.8°C | 8.8°C | 69 mm | 80% | 0.3 m/s | 5.4 |
| 1991 | 21.3°C | 16.3°C | 11.3°C | 32.7°C | 8.1°C | 23 mm | 78% | 0.3 m/s | 6 |
| 1990 | 23.6°C | 18.1°C | 12.6°C | 32.9°C | 7.5°C | 34 mm | 78% | 0.3 m/s | 6.3 |
| 1989 | 20.0°C | 15.1°C | 10.2°C | 27.3°C | 7.8°C | 35 mm | 81% | 0.2 m/s | 5.4 |
| 1988 | 21.1°C | 15.8°C | 10.6°C | 31.6°C | 5.3°C | 45 mm | 77% | 0.3 m/s | 5.9 |
| 1987 | 20.1°C | 15.4°C | 10.6°C | 26.1°C | 8.2°C | 47 mm | 80% | 0.2 m/s | 5.1 |
| 1986 | 18.5°C | 13.9°C | 9.3°C | 23.5°C | 6.3°C | 62 mm | 82% | 0.3 m/s | 5 |
| 1985 🔥 | 24.7°C | 18.9°C | 13.0°C | 33.5°C | 9.0°C | 8 mm | 71% | 0.3 m/s | 6.6 |
| 1984 | 21.8°C | 16.1°C | 10.5°C | 31.5°C | 6.2°C | 5 mm | 75% | 0.3 m/s | 6.3 |
| 1983 🌧️ | 19.5°C | 14.8°C | 10.0°C | 32.7°C | 7.7°C | 140 mm | 82% | 0.3 m/s | — |
| 1982 | 20.6°C | 15.5°C | 10.5°C | 34.0°C | 6.8°C | 63 mm | 81% | 0.2 m/s | — |
| 1981 | 20.4°C | 15.5°C | 10.5°C | 28.7°C | 5.9°C | 47 mm | 81% | 0.3 m/s | — |
Actual recorded July data for each year, 1981–2025 — sourced from NASA POWER.
The average high in July is around 21.6°C with lows near 11.6°C (mean 16.6°C), based on 45 years of NASA POWER data.
July averages 36 mm of rainfall in Sammamish, one of the drier months. The wettest on record was 140 mm in 1983.
The hottest July reached 37.8°C in 2006. The coldest dipped to 3.4°C in 2025.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average July temperatures have risen by about 1.2°C. Daytime highs moved from 21.4°C to 22.6°C and overnight lows from 10.9°C to 12.1°C over the same span.
July is one of the warmer months of the year in Sammamish and one of the drier months, so plan for around 21.6°C daytime highs and 11.6°C at night.
Not quite — July is the 11th coolest month in Sammamish, averaging 16.6°C.
For July in Sammamish, pack light layers you can adjust through the day, with typical highs of 21.6°C and lows of 11.6°C.
Relative humidity in July averages 78% — quite humid.
Average wind speed in July is 0.3 m/s. The windiest July on record averaged 0.3 m/s (1981).
The wettest July on record was 1983 with 140 mm. On average, July sees 36 mm.
All figures are derived from NASA POWER (Prediction Of Worldwide Energy Resources), based on MERRA-2 satellite reanalysis, covering 1981–2025.
Explore how the weather in Sammamish behaves each July, based on 45 years of NASA POWER climate data from 1981 to 2025. This page breaks down average temperatures, rainfall, humidity, wind and solar radiation for July specifically, along with year-by-year records and how the month has changed over the decades.
