July is one of the warmer months of the year in Washington, with average highs near 29°C and lows around 17°C (mean 23°C). It is a relatively wet time of year, averaging 102 mm of rainfall and 72% 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 2020 — when the month averaged 25.8°C — while the coldest was 1996 at 19.8°C. Typical July days reach 29°C with nights near 17°C. The long-term trend is warming, about 0.4°C per decade.
July is a relatively wet time of year in Washington, averaging 102 mm of rainfall. The wettest July on record was 1992 with 176 mm, while the driest was 2020 at 46 mm.
Relative humidity in Washington during July averages 72%. The most humid July was 1989 at 82%, and the least humid was 1999 at 57%.
July receives about 5.8 kWh/m²/day of solar energy in Washington. The sunniest July was 2020 at 6.6 kWh/m²/day, and the cloudiest were 1984 and 1992 at 4.8.
Average wind speed in Washington during July is 0.1 m/s. The windiest Julys were 2023, 2024 and 2025, among others at 0.1 m/s, while the calmest were 1992, 2003 and 2018, among others at 0 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 22.4°C | 22.8°C | 22.2°C | 23.5°C | 24.4°C | +2°C |
| Avg High | 28.5°C | 28.8°C | 28.2°C | 29.3°C | 30.6°C | +2.1°C |
| Avg Low | 16.4°C | 16.8°C | 16.2°C | 17.6°C | 18.3°C | +1.9°C |
| Avg Rain | 110 mm | 102 mm | 105 mm | 100 mm | 92 mm | -18 mm |
July temperatures in Washington have risen by about 2.5°C between 1981–1985 and 2021–2025.
July has ranged from a record low of 6.5°C (1988) to a record high of 38.6°C (1988).
Rainfall in July is a relatively wet time of year, averaging 102 mm, with a wettest year of 176 mm.
One of the best times to visit Washington
July is one of the best times to visit Washington. Expect days averaging 29°C and nights around 17°C (mean 23°C) — warmer than Washington's yearly average — with higher rainfall (102 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 | 30.6°C | 25.0°C | 19.4°C | 35.1°C | 14.1°C | 113 mm | 76% | 0.1 m/s | 6 |
| 2024 | 31.0°C | 24.5°C | 17.9°C | 35.5°C | 11.1°C | 90 mm | 65% | 0.1 m/s | 6 |
| 2023 | 30.1°C | 24.0°C | 18.0°C | 34.0°C | 14.2°C | 108 mm | 71% | 0.1 m/s | 5.8 |
| 2022 | 30.0°C | 24.0°C | 18.0°C | 34.0°C | 14.5°C | 105 mm | 71% | 0.1 m/s | 5.8 |
| 2021 | 29.5°C | 23.3°C | 17.2°C | 33.5°C | 12.3°C | 91 mm | 69% | 0.1 m/s | 5.7 |
| 2020 🔥 | 32.4°C | 25.8°C | 19.3°C | 35.8°C | 14.3°C | 46 mm | 64% | 0.1 m/s | 6.6 |
| 2019 | 29.0°C | 23.7°C | 18.4°C | 35.0°C | 12.3°C | 106 mm | 79% | 0.1 m/s | 6.1 |
| 2018 | 28.9°C | 23.0°C | 17.1°C | 34.5°C | 10.6°C | 59 mm | 75% | 0 m/s | 6.4 |
| 2017 | 28.1°C | 22.7°C | 17.3°C | 32.4°C | 11.2°C | 152 mm | 79% | 0.1 m/s | 5.6 |
| 2016 | 30.4°C | 24.4°C | 18.5°C | 35.5°C | 11.8°C | 85 mm | 69% | 0.1 m/s | 5.9 |
| 2015 | 28.7°C | 22.8°C | 17.0°C | 33.9°C | 11.3°C | 73 mm | 75% | 0.1 m/s | 5.9 |
| 2014 | 28.3°C | 21.8°C | 15.4°C | 33.5°C | 9.4°C | 89 mm | 67% | 0.1 m/s | 5.7 |
| 2013 | 27.5°C | 22.6°C | 17.7°C | 33.8°C | 10.7°C | 131 mm | 80% | 0.1 m/s | 5.5 |
| 2012 | 31.9°C | 25.5°C | 19.1°C | 38.2°C | 13.7°C | 129 mm | 66% | 0.1 m/s | 5.7 |
| 2011 | 29.7°C | 23.9°C | 18.0°C | 33.1°C | 12.5°C | 87 mm | 76% | 0.1 m/s | 6.4 |
| 2010 | 30.5°C | 24.2°C | 17.9°C | 35.0°C | 9.3°C | 90 mm | 68% | 0.1 m/s | 6.5 |
| 2009 | 26.0°C | 20.4°C | 14.7°C | 31.3°C | 11.2°C | 105 mm | 73% | 0.1 m/s | 5.4 |
| 2008 | 26.9°C | 21.5°C | 16.2°C | 30.9°C | 12.4°C | 121 mm | 80% | 0.1 m/s | 6.3 |
| 2007 | 27.8°C | 21.4°C | 15.1°C | 33.2°C | 8.0°C | 116 mm | 68% | 0.1 m/s | 5.9 |
| 2006 | 29.3°C | 23.4°C | 17.6°C | 34.3°C | 10.0°C | 101 mm | 75% | 0.1 m/s | 5.6 |
| 2005 | 30.6°C | 24.6°C | 18.5°C | 34.7°C | 13.8°C | 73 mm | 69% | 0.1 m/s | 6 |
| 2004 | 26.5°C | 21.6°C | 16.6°C | 30.5°C | 12.8°C | 124 mm | 80% | 0.1 m/s | 5.1 |
| 2003 | 26.6°C | 21.5°C | 16.5°C | 29.3°C | 12.7°C | 153 mm | 81% | 0 m/s | 5.7 |
| 2002 | 31.4°C | 24.6°C | 17.8°C | 35.3°C | 10.2°C | 65 mm | 64% | 0.1 m/s | 6.2 |
| 2001 | 29.1°C | 21.7°C | 14.3°C | 35.3°C | 8.4°C | 97 mm | 64% | 0.1 m/s | 6.3 |
| 2000 | 28.0°C | 21.4°C | 14.8°C | 32.2°C | 10.4°C | 93 mm | 67% | 0.1 m/s | 5.6 |
| 1999 | 33.0°C | 25.7°C | 18.5°C | 36.6°C | 10.9°C | 87 mm | 57% | 0.1 m/s | 6.4 |
| 1998 | 27.3°C | 21.6°C | 15.9°C | 30.0°C | 10.6°C | 59 mm | 75% | 0.1 m/s | 6.1 |
| 1997 | 29.6°C | 22.8°C | 16.0°C | 34.4°C | 11.2°C | 68 mm | 66% | 0.1 m/s | 6.2 |
| 1996 ❄️ | 25.0°C | 19.8°C | 14.5°C | 28.2°C | 8.1°C | 159 mm | 80% | 0.1 m/s | 5.7 |
| 1995 | 29.4°C | 23.3°C | 17.3°C | 36.7°C | 8.5°C | 61 mm | 72% | 0.1 m/s | 6 |
| 1994 | 29.1°C | 23.3°C | 17.4°C | 32.6°C | 12.5°C | 87 mm | 72% | 0.1 m/s | 5.6 |
| 1993 | 30.7°C | 24.3°C | 17.9°C | 35.7°C | 11.9°C | 87 mm | 66% | 0.1 m/s | 6 |
| 1992 🌧️ | 27.7°C | 22.4°C | 17.1°C | 32.0°C | 11.7°C | 176 mm | 78% | 0 m/s | 4.8 |
| 1991 | 30.2°C | 23.9°C | 17.5°C | 35.2°C | 12.0°C | 77 mm | 66% | 0.1 m/s | 6.1 |
| 1990 | 26.2°C | 21.0°C | 15.8°C | 29.7°C | 11.2°C | 156 mm | 82% | 0.1 m/s | 5.2 |
| 1989 | 27.0°C | 22.1°C | 17.2°C | 31.4°C | 11.3°C | 104 mm | 82% | 0.1 m/s | 5.6 |
| 1988 | 32.0°C | 24.7°C | 17.5°C | 38.6°C | 6.5°C | 105 mm | 58% | 0.1 m/s | 5.6 |
| 1987 | 30.6°C | 24.2°C | 17.8°C | 35.2°C | 11.1°C | 58 mm | 68% | 0.1 m/s | 6.1 |
| 1986 | 28.3°C | 22.6°C | 16.9°C | 32.2°C | 9.5°C | 154 mm | 77% | 0 m/s | 5.5 |
| 1985 | 27.1°C | 21.2°C | 15.2°C | 32.0°C | 10.4°C | 150 mm | 76% | 0.1 m/s | 5.8 |
| 1984 | 25.7°C | 20.1°C | 14.4°C | 30.8°C | 8.5°C | 106 mm | 77% | 0.1 m/s | 4.8 |
| 1983 | 28.6°C | 22.5°C | 16.4°C | 32.9°C | 7.0°C | 92 mm | 73% | 0.1 m/s | — |
| 1982 | 29.3°C | 23.1°C | 16.8°C | 33.7°C | 8.6°C | 96 mm | 70% | 0.1 m/s | — |
| 1981 | 27.5°C | 21.5°C | 15.5°C | 32.4°C | 9.3°C | 123 mm | 76% | 0.1 m/s | — |
Actual recorded July data for each year, 1981–2025 — sourced from NASA POWER.
The average high in July is around 29°C with lows near 17°C (mean 23°C), based on 45 years of NASA POWER data.
July averages 102 mm of rainfall in Washington, a relatively wet time of year. The wettest on record was 176 mm in 1992.
The hottest July reached 38.6°C in 1988. The coldest dipped to 6.5°C in 1988.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average July temperatures have risen by about 2.5°C. Daytime highs moved from 27.6°C to 30.2°C and overnight lows from 15.7°C to 18.1°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 29°C daytime highs and 17°C at night.
Not quite — July is the 12th coolest month in Washington, averaging 23°C.
For July in Washington, pack light layers you can adjust through the day, with typical highs of 29°C and lows of 17°C. Bring an umbrella or light rain jacket too.
Relative humidity in July averages 72% — moderately humid.
Average wind speed in July is 0.1 m/s. The windiest July on record averaged 0.1 m/s (1981).
The wettest July on record was 1992 with 176 mm. On average, July sees 102 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.
