July is one of the warmer months of the year in Portland, with average highs near 20.3°C and lows around 16.7°C (mean 18.5°C). It is one of the drier months, averaging 93 mm of rainfall and 87% relative humidity across the period.
July is one of the warmer months of the year in Portland. Across 45 years of records, the warmest July in Portland was 2020 — when the month averaged 20.4°C — while the coldest was 1992 at 16.5°C. Typical July days reach 20.3°C with nights near 16.7°C. The long-term trend is warming, about 0.5°C per decade.
July is one of the drier months in Portland, averaging 93 mm of rainfall. The wettest July on record was 2009 with 208 mm, while the driest was 2025 at 41 mm.
Relative humidity in Portland during July averages 87%. The most humid July was 2023 at 91%, and the least humid was 2022 at 81%.
July receives about 5.8 kWh/m²/day of solar energy in Portland. The sunniest July was 2019 at 6.5 kWh/m²/day, and the cloudiest was 2021 at 4.6.
Average wind speed in Portland during July is 2.4 m/s. The windiest Julys were 1996 and 2014 at 2.8 m/s, while the calmest was 2015 at 2 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 17.8°C | 18.2°C | 17.9°C | 19.4°C | 19.7°C | +1.9°C |
| Avg High | 19.8°C | 20.1°C | 19.6°C | 21.1°C | 21.5°C | +1.7°C |
| Avg Low | 15.9°C | 16.2°C | 16.2°C | 17.6°C | 17.9°C | +2°C |
| Avg Rain | 93 mm | 80 mm | 102 mm | 90 mm | 102 mm | +8 mm |
July temperatures in Portland have risen by about 1.5°C between 1981–1985 and 2021–2025.
July has ranged from a record low of 10.4°C (1988) to a record high of 26.4°C (2011).
Rainfall in July is one of the drier months, averaging 93 mm, with a wettest year of 208 mm.
One of the best times to visit Portland
July is one of the best times to visit Portland. Expect days averaging 20.3°C and nights around 16.7°C (mean 18.5°C) — warmer than Portland's yearly average — with higher rainfall (93 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 | 21.5°C | 19.5°C | 17.6°C | 25.7°C | 14.9°C | 41 mm | 85% | 2.5 m/s | 5.9 |
| 2024 | 21.9°C | 20.1°C | 18.3°C | 24.3°C | 15.4°C | 60 mm | 87% | 2.5 m/s | 6 |
| 2023 | 21.7°C | 20.3°C | 18.9°C | 23.6°C | 15.9°C | 138 mm | 91% | 2.3 m/s | 5.4 |
| 2022 | 22.0°C | 19.9°C | 17.8°C | 24.3°C | 14.7°C | 56 mm | 81% | 2.6 m/s | 6.4 |
| 2021 | 19.7°C | 18.0°C | 16.2°C | 23.5°C | 12.8°C | 194 mm | 88% | 2.5 m/s | 4.6 |
| 2020 🔥 | 22.0°C | 20.4°C | 18.8°C | 26.2°C | 15.8°C | 122 mm | 88% | 2.5 m/s | 5.8 |
| 2019 | 21.7°C | 19.9°C | 18.0°C | 25.2°C | 15.0°C | 69 mm | 87% | 2.1 m/s | 6.5 |
| 2018 | 20.9°C | 19.3°C | 17.7°C | 24.0°C | 14.4°C | 126 mm | 89% | 2.4 m/s | 6.3 |
| 2017 | 20.0°C | 18.4°C | 16.8°C | 22.8°C | 14.4°C | 65 mm | 87% | 2.4 m/s | 6 |
| 2016 | 21.5°C | 19.6°C | 17.7°C | 25.8°C | 14.6°C | 55 mm | 83% | 2.4 m/s | 6.2 |
| 2015 | 20.3°C | 18.4°C | 16.5°C | 23.4°C | 13.8°C | 74 mm | 87% | 2 m/s | 5.8 |
| 2014 | 20.3°C | 18.8°C | 17.3°C | 23.0°C | 15.0°C | 171 mm | 89% | 2.8 m/s | 5.9 |
| 2013 | 21.4°C | 19.7°C | 17.9°C | 25.8°C | 13.6°C | 94 mm | 91% | 2.1 m/s | 5.3 |
| 2012 | 21.5°C | 19.8°C | 18.1°C | 24.1°C | 16.1°C | 74 mm | 87% | 2.2 m/s | 6.2 |
| 2011 | 21.6°C | 19.7°C | 17.8°C | 26.4°C | 15.8°C | 67 mm | 87% | 2.2 m/s | 6.3 |
| 2010 | 21.7°C | 20.0°C | 18.2°C | 25.8°C | 14.3°C | 111 mm | 87% | 2.4 m/s | 6.3 |
| 2009 🌧️ | 18.3°C | 16.8°C | 15.3°C | 22.3°C | 12.2°C | 208 mm | 91% | 2.6 m/s | 5.1 |
| 2008 | 20.6°C | 19.1°C | 17.6°C | 23.9°C | 15.0°C | 119 mm | 90% | 2.4 m/s | 5.8 |
| 2007 | 19.2°C | 17.6°C | 16.0°C | 22.2°C | 12.2°C | 101 mm | 90% | 2.2 m/s | 5.5 |
| 2006 | 20.9°C | 19.3°C | 17.7°C | 23.9°C | 15.4°C | 132 mm | 91% | 2.4 m/s | 5.9 |
| 2005 | 19.5°C | 17.7°C | 15.8°C | 24.6°C | 12.5°C | 64 mm | 90% | 2.3 m/s | 6.1 |
| 2004 | 18.3°C | 16.7°C | 15.1°C | 20.8°C | 12.9°C | 83 mm | 90% | 2.1 m/s | 5.2 |
| 2003 | 19.5°C | 17.8°C | 16.2°C | 23.9°C | 13.9°C | 50 mm | 89% | 2.3 m/s | 5.7 |
| 2002 | 20.8°C | 18.7°C | 16.7°C | 25.6°C | 13.8°C | 64 mm | 85% | 2.4 m/s | 6 |
| 2001 | 19.5°C | 17.6°C | 15.7°C | 23.7°C | 13.1°C | 67 mm | 82% | 2.3 m/s | 6.1 |
| 2000 | 18.9°C | 17.2°C | 15.4°C | 21.7°C | 13.0°C | 129 mm | 87% | 2.5 m/s | 5.4 |
| 1999 | 21.6°C | 19.3°C | 17.1°C | 25.6°C | 14.2°C | 54 mm | 83% | 2.2 m/s | 5.9 |
| 1998 | 20.0°C | 18.3°C | 16.6°C | 23.7°C | 14.5°C | 57 mm | 89% | 2.2 m/s | 6.1 |
| 1997 | 20.2°C | 18.1°C | 16.0°C | 23.0°C | 13.9°C | 75 mm | 84% | 2.4 m/s | 6.2 |
| 1996 | 18.4°C | 16.8°C | 15.2°C | 21.4°C | 13.8°C | 166 mm | 90% | 2.8 m/s | 5.5 |
| 1995 | 20.8°C | 18.9°C | 16.9°C | 25.3°C | 15.0°C | 90 mm | 86% | 2.3 m/s | 5.4 |
| 1994 | 21.1°C | 19.2°C | 17.4°C | 24.0°C | 14.7°C | 57 mm | 87% | 2.3 m/s | 5.8 |
| 1993 | 20.0°C | 18.1°C | 16.1°C | 25.0°C | 13.7°C | 56 mm | 84% | 2.3 m/s | 5.7 |
| 1992 ❄️ | 18.4°C | 16.5°C | 14.5°C | 21.5°C | 11.5°C | 99 mm | 86% | 2.4 m/s | 5.8 |
| 1991 | 20.5°C | 18.4°C | 16.4°C | 24.6°C | 13.1°C | 67 mm | 82% | 2.4 m/s | 5.7 |
| 1990 | 19.7°C | 17.9°C | 16.1°C | 22.4°C | 12.9°C | 76 mm | 88% | 2.2 m/s | 5.7 |
| 1989 | 19.3°C | 17.6°C | 15.9°C | 23.3°C | 13.8°C | 50 mm | 89% | 2.2 m/s | 5.8 |
| 1988 | 20.3°C | 18.5°C | 16.6°C | 23.7°C | 10.4°C | 164 mm | 89% | 2.2 m/s | 5.1 |
| 1987 | 19.2°C | 17.3°C | 15.3°C | 23.9°C | 12.6°C | 48 mm | 88% | 2.3 m/s | 5.5 |
| 1986 | 18.3°C | 16.6°C | 14.8°C | 21.8°C | 11.0°C | 101 mm | 88% | 2.6 m/s | 5.3 |
| 1985 | 19.6°C | 17.5°C | 15.3°C | 22.8°C | 12.0°C | 83 mm | 83% | 2.5 m/s | 6.3 |
| 1984 | 19.7°C | 18.1°C | 16.4°C | 21.8°C | 13.8°C | 95 mm | 89% | 2.5 m/s | 5.5 |
| 1983 | 20.2°C | 18.0°C | 15.8°C | 22.9°C | 12.8°C | 86 mm | 86% | 2.3 m/s | — |
| 1982 | 20.1°C | 18.0°C | 16.0°C | 24.1°C | 11.5°C | 79 mm | 86% | 2.4 m/s | — |
| 1981 | 21.2°C | 19.0°C | 16.8°C | 24.1°C | 14.1°C | 134 mm | 83% | 2.5 m/s | — |
Actual recorded July data for each year, 1981–2025 — sourced from NASA POWER.
The average high in July is around 20.3°C with lows near 16.7°C (mean 18.5°C), based on 45 years of NASA POWER data.
July averages 93 mm of rainfall in Portland, one of the drier months. The wettest on record was 208 mm in 2009.
The hottest July reached 26.4°C in 2011. The coldest dipped to 10.4°C in 1988.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average July temperatures have risen by about 1.5°C. Daytime highs moved from 20.2°C to 21.4°C and overnight lows from 16.1°C to 17.8°C over the same span.
July is one of the warmer months of the year in Portland and one of the drier months, so plan for around 20.3°C daytime highs and 16.7°C at night.
Not quite — July is the 11th coolest month in Portland, averaging 18.5°C.
For July in Portland, pack light layers you can adjust through the day, with typical highs of 20.3°C and lows of 16.7°C. Bring an umbrella or light rain jacket too.
Relative humidity in July averages 87% — quite humid.
Average wind speed in July is 2.4 m/s. The windiest July on record averaged 2.8 m/s (1996).
The wettest July on record was 2009 with 208 mm. On average, July sees 93 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 Portland 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.
