July is one of the warmer months of the year in Washington, with average highs near 30.8°C and lows around 20.5°C (mean 25.7°C). It is a relatively wet time of year, averaging 110 mm of rainfall and 68% relative humidity across the period.
July is one of the warmer months of the year in Washington. Across 45 years of records, the warmest July in Washington was 2024 — when the month averaged 28.1°C — while the coldest was 1984 at 22.4°C. Typical July days reach 30.8°C with nights near 20.5°C. The long-term trend is warming, about 0.4°C per decade.
July is a relatively wet time of year in Washington, averaging 110 mm of rainfall. The wettest July on record was 2018 with 248 mm, while the driest was 1983 at 37 mm.
Relative humidity in Washington during July averages 68%. The most humid July was 2003 at 83%, and the least humid was 1999 at 55%.
July receives about 6 kWh/m²/day of solar energy in Washington. The sunniest Julys were 2011, 2019 and 2020 at 6.6 kWh/m²/day, and the cloudiest was 1984 at 5.1.
Average wind speed in Washington during July is 2 m/s. The windiest Julys were 1992, 1996 and 2001, among others at 2.3 m/s, while the calmest was 2025 at 1.7 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 25.2°C | 25.6°C | 24.7°C | 26.1°C | 27.4°C | +2.2°C |
| Avg High | 30.5°C | 30.9°C | 29.7°C | 31.0°C | 32.6°C | +2.1°C |
| Avg Low | 19.9°C | 20.3°C | 19.7°C | 21.2°C | 22.1°C | +2.2°C |
| Avg Rain | 102 mm | 97 mm | 107 mm | 129 mm | 115 mm | +14 mm |
July temperatures in Washington have risen by about 2.7°C between 1981–1985 and 2021–2025.
July has ranged from a record low of 11.3°C (1988) to a record high of 40.2°C (2012).
Rainfall in July is a relatively wet time of year, averaging 110 mm, with a wettest year of 248 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0.3°C per decade while lows rose 0.5°C per decade, narrowing the gap between day and night.
One of the best times to visit Washington
July is one of the best times to visit Washington. Expect days averaging 30.8°C and nights around 20.5°C (mean 25.7°C) — warmer than Washington's yearly average — with higher rainfall (110 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 | 32.3°C | 27.4°C | 22.6°C | 35.9°C | 18.4°C | 152 mm | 71% | 1.7 m/s | 6.2 |
| 2024 🔥 | 33.6°C | 28.1°C | 22.5°C | 39.3°C | 16.8°C | 67 mm | 62% | 2 m/s | 5.9 |
| 2023 | 32.3°C | 27.2°C | 22.0°C | 36.8°C | 19.6°C | 132 mm | 68% | 1.8 m/s | 6.3 |
| 2022 | 32.0°C | 26.9°C | 21.7°C | 37.3°C | 16.7°C | 123 mm | 67% | 2 m/s | 5.6 |
| 2021 | 32.1°C | 26.6°C | 21.1°C | 35.4°C | 15.3°C | 89 mm | 64% | 2.1 m/s | 6.1 |
| 2020 | 33.2°C | 28.0°C | 22.8°C | 36.7°C | 20.2°C | 129 mm | 66% | 1.9 m/s | 6.6 |
| 2019 | 31.3°C | 26.3°C | 21.2°C | 35.6°C | 17.2°C | 130 mm | 71% | 1.8 m/s | 6.6 |
| 2018 🌧️ | 29.2°C | 24.7°C | 20.2°C | 33.9°C | 14.4°C | 248 mm | 75% | 2.1 m/s | 6.1 |
| 2017 | 31.6°C | 26.5°C | 21.5°C | 36.4°C | 15.6°C | 180 mm | 67% | 2.1 m/s | 6.1 |
| 2016 | 31.9°C | 26.8°C | 21.7°C | 37.3°C | 17.6°C | 137 mm | 68% | 1.9 m/s | 6.3 |
| 2015 | 28.8°C | 24.5°C | 20.3°C | 32.1°C | 15.1°C | 92 mm | 77% | 1.9 m/s | 5.8 |
| 2014 | 28.9°C | 24.0°C | 19.1°C | 33.2°C | 14.2°C | 83 mm | 74% | 2.1 m/s | 6.1 |
| 2013 | 29.4°C | 25.4°C | 21.4°C | 33.3°C | 16.2°C | 120 mm | 79% | 2.1 m/s | 5.8 |
| 2012 | 33.1°C | 27.9°C | 22.7°C | 40.2°C | 18.8°C | 98 mm | 62% | 2 m/s | 5.9 |
| 2011 | 33.3°C | 27.8°C | 22.2°C | 38.7°C | 16.9°C | 87 mm | 63% | 1.8 m/s | 6.6 |
| 2010 | 32.8°C | 27.2°C | 21.7°C | 38.7°C | 14.7°C | 114 mm | 61% | 2 m/s | 6.5 |
| 2009 | 28.9°C | 23.9°C | 18.8°C | 33.8°C | 15.5°C | 75 mm | 69% | 2 m/s | 5.9 |
| 2008 | 30.0°C | 25.0°C | 20.0°C | 34.0°C | 15.6°C | 93 mm | 71% | 1.8 m/s | 6.2 |
| 2007 | 31.5°C | 25.8°C | 20.1°C | 36.6°C | 15.0°C | 58 mm | 59% | 2.2 m/s | 6 |
| 2006 | 29.9°C | 25.3°C | 20.7°C | 34.3°C | 16.2°C | 81 mm | 77% | 1.9 m/s | 5.9 |
| 2005 | 30.7°C | 26.0°C | 21.3°C | 36.1°C | 17.6°C | 136 mm | 72% | 1.9 m/s | 5.5 |
| 2004 | 29.2°C | 24.6°C | 20.0°C | 31.8°C | 17.4°C | 143 mm | 76% | 2.1 m/s | 5.4 |
| 2003 | 27.7°C | 23.6°C | 19.5°C | 31.1°C | 16.3°C | 142 mm | 83% | 2.1 m/s | 5.6 |
| 2002 | 32.8°C | 26.9°C | 21.0°C | 37.6°C | 15.4°C | 66 mm | 57% | 2.2 m/s | 5.8 |
| 2001 | 29.1°C | 23.4°C | 17.8°C | 34.8°C | 12.6°C | 114 mm | 64% | 2.3 m/s | 6.3 |
| 2000 | 27.5°C | 22.6°C | 17.7°C | 32.3°C | 13.5°C | 164 mm | 71% | 1.9 m/s | 5.5 |
| 1999 | 33.8°C | 27.6°C | 21.3°C | 38.5°C | 17.1°C | 62 mm | 55% | 2.2 m/s | 6 |
| 1998 | 30.1°C | 24.6°C | 19.2°C | 35.8°C | 14.4°C | 52 mm | 66% | 2.1 m/s | 6.2 |
| 1997 | 31.5°C | 25.6°C | 19.6°C | 36.7°C | 16.0°C | 60 mm | 58% | 2.1 m/s | 6.2 |
| 1996 | 27.2°C | 22.7°C | 18.2°C | 30.1°C | 13.0°C | 174 mm | 79% | 2.3 m/s | 5.4 |
| 1995 | 31.2°C | 26.1°C | 21.0°C | 38.4°C | 14.9°C | 86 mm | 68% | 2 m/s | 6.1 |
| 1994 | 30.3°C | 25.7°C | 21.0°C | 34.1°C | 17.4°C | 136 mm | 73% | 1.8 m/s | 5.4 |
| 1993 | 32.5°C | 26.9°C | 21.2°C | 36.3°C | 16.4°C | 50 mm | 60% | 2.1 m/s | 5.9 |
| 1992 | 30.2°C | 25.1°C | 20.1°C | 36.4°C | 15.7°C | 138 mm | 69% | 2.3 m/s | 5.7 |
| 1991 | 32.6°C | 27.0°C | 21.3°C | 38.1°C | 17.2°C | 89 mm | 60% | 2.1 m/s | 5.6 |
| 1990 | 30.0°C | 25.0°C | 20.0°C | 35.2°C | 16.4°C | 122 mm | 73% | 2.3 m/s | 5.6 |
| 1989 | 27.4°C | 23.5°C | 19.6°C | 30.9°C | 14.8°C | 164 mm | 82% | 1.9 m/s | 5.4 |
| 1988 | 32.6°C | 26.7°C | 20.7°C | 38.5°C | 11.3°C | 127 mm | 61% | 2 m/s | 5.9 |
| 1987 | 32.3°C | 26.9°C | 21.5°C | 37.5°C | 14.3°C | 63 mm | 63% | 1.8 m/s | 6.2 |
| 1986 | 32.9°C | 27.1°C | 21.3°C | 37.1°C | 13.9°C | 87 mm | 60% | 2.3 m/s | 6.4 |
| 1985 | 31.0°C | 25.3°C | 19.7°C | 35.0°C | 15.7°C | 104 mm | 62% | 2.2 m/s | 6.4 |
| 1984 ❄️ | 26.7°C | 22.4°C | 18.1°C | 31.6°C | 11.9°C | 122 mm | 79% | 2.2 m/s | 5.1 |
| 1983 | 30.3°C | 24.6°C | 19.0°C | 35.2°C | 12.9°C | 37 mm | 68% | 2 m/s | — |
| 1982 | 29.9°C | 24.7°C | 19.5°C | 35.8°C | 13.3°C | 92 mm | 71% | 1.9 m/s | — |
| 1981 | 31.1°C | 25.4°C | 19.6°C | 35.3°C | 14.1°C | 119 mm | 64% | 2.3 m/s | — |
Actual recorded July data for each year, 1981–2025 — sourced from NASA POWER.
The average high in July is around 30.8°C with lows near 20.5°C (mean 25.7°C), based on 45 years of NASA POWER data.
July averages 110 mm of rainfall in Washington, a relatively wet time of year. The wettest on record was 248 mm in 2018.
The hottest July reached 40.2°C in 2012. The coldest dipped to 11.3°C in 1988.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average July temperatures have risen by about 2.7°C. Daytime highs moved from 29.8°C to 32.5°C and overnight lows from 19.2°C to 22°C over the same span.
July is one of the warmer months of the year in Washington and a relatively wet time of year, so plan for around 30.8°C daytime highs and 20.5°C at night.
Not quite — July is the 12th coolest month in Washington, averaging 25.7°C.
For July in Washington, pack light, breathable clothing and sun protection, with typical highs of 30.8°C and lows of 20.5°C. Bring an umbrella or light rain jacket too.
Relative humidity in July averages 68% — moderately humid.
Average wind speed in July is 2 m/s. The windiest July on record averaged 2.3 m/s (1981).
The wettest July on record was 2018 with 248 mm. On average, July sees 110 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 Washington 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.
