July is one of the cooler months of the year in Portland, with average highs near 13.1°C and lows around 10.3°C (mean 11.7°C). It is a relatively wet time of year, averaging 92 mm of rainfall and 79% relative humidity across the period.
July is one of the cooler months of the year in Portland. Across 45 years of records, the warmest Julys in Portland were 2001 and 2023 — when the month averaged 12.6°C — while the coldest was 1982 at 10.7°C. Typical July days reach 13.1°C with nights near 10.3°C. The long-term trend is warming, about 0.2°C per decade.
July is a relatively wet time of year in Portland, averaging 92 mm of rainfall. The wettest July on record was 2013 with 153 mm, while the driest was 2020 at 44 mm.
Relative humidity in Portland during July averages 79%. The most humid July was 1986 at 83%, and the least humid was 1985 at 76%.
July receives about 1.9 kWh/m²/day of solar energy in Portland. The sunniest Julys were 1994 and 2017 at 2.1 kWh/m²/day, and the cloudiest was 2016 at 1.6.
Average wind speed in Portland during July is 6.1 m/s. The windiest July was 2018 at 7.2 m/s, while the calmest was 2020 at 4.7 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 11.2°C | 11.6°C | 11.9°C | 11.9°C | 11.9°C | +0.7°C |
| Avg High | 12.6°C | 13.0°C | 13.3°C | 13.3°C | 13.4°C | +0.8°C |
| Avg Low | 9.8°C | 10.1°C | 10.5°C | 10.6°C | 10.5°C | +0.7°C |
| Avg Rain | 99 mm | 93 mm | 98 mm | 93 mm | 70 mm | -29 mm |
July temperatures in Portland have risen by about 0.9°C between 1981–1985 and 2021–2025.
July has ranged from a record low of 6.2°C (1983) to a record high of 17°C (1994).
Rainfall in July is a relatively wet time of year, averaging 92 mm, with a wettest year of 153 mm.
A quieter season to visit Portland
If your dates are flexible, the more temperate months of February and January tend to be the most comfortable for visiting Portland. That said, July — with days averaging 13.1°C and nights around 10.3°C (mean 11.7°C) and higher rainfall (92 mm) — can still be rewarding for travellers who don't mind the cooler conditions, and often means fewer crowds.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 13.6°C | 12.2°C | 10.9°C | 16.0°C | 7.9°C | 88 mm | 77% | 6.3 m/s | 1.9 |
| 2024 | 13.2°C | 11.7°C | 10.2°C | 16.5°C | 7.3°C | 71 mm | 78% | 5.9 m/s | 2 |
| 2023 | 14.0°C | 12.6°C | 11.2°C | 16.7°C | 8.8°C | 50 mm | 80% | 6.5 m/s | 1.8 |
| 2022 | 13.1°C | 11.7°C | 10.3°C | 16.6°C | 7.9°C | 46 mm | 78% | 5.6 m/s | 2 |
| 2021 | 13.2°C | 11.7°C | 10.2°C | 15.5°C | 8.1°C | 124 mm | 80% | 6.7 m/s | 1.8 |
| 2020 | 13.0°C | 11.6°C | 10.2°C | 16.5°C | 8.2°C | 44 mm | 79% | 4.7 m/s | 2 |
| 2019 | 13.7°C | 12.3°C | 10.9°C | 16.9°C | 9.5°C | 66 mm | 78% | 6.8 m/s | 1.8 |
| 2018 | 13.4°C | 12.0°C | 10.6°C | 16.2°C | 8.3°C | 79 mm | 76% | 7.2 m/s | 1.9 |
| 2017 | 13.4°C | 11.8°C | 10.2°C | 16.8°C | 8.2°C | 73 mm | 78% | 6.4 m/s | 2.1 |
| 2016 | 13.3°C | 12.0°C | 10.7°C | 16.7°C | 8.4°C | 104 mm | 80% | 6.8 m/s | 1.6 |
| 2015 | 12.3°C | 10.8°C | 9.4°C | 15.1°C | 7.2°C | 61 mm | 78% | 6.5 m/s | 1.8 |
| 2014 | 13.3°C | 11.9°C | 10.6°C | 15.5°C | 8.5°C | 116 mm | 81% | 6.7 m/s | 1.8 |
| 2013 🌧️ | 13.8°C | 12.5°C | 11.1°C | 16.4°C | 8.4°C | 153 mm | 81% | 6.1 m/s | 1.8 |
| 2012 | 13.2°C | 11.9°C | 10.7°C | 15.3°C | 8.4°C | 97 mm | 81% | 5.3 m/s | 1.9 |
| 2011 | 13.2°C | 11.9°C | 10.6°C | 16.6°C | 8.3°C | 102 mm | 80% | 6.9 m/s | 1.8 |
| 2010 | 13.2°C | 12.0°C | 10.8°C | 16.1°C | 9.0°C | 83 mm | 80% | 5 m/s | 2 |
| 2009 | 13.3°C | 12.0°C | 10.8°C | 15.4°C | 8.6°C | 131 mm | 80% | 6.6 m/s | 1.8 |
| 2008 | 13.1°C | 11.5°C | 10.0°C | 15.4°C | 7.7°C | 129 mm | 78% | 6.3 m/s | 1.9 |
| 2007 | 12.9°C | 11.5°C | 10.2°C | 16.4°C | 7.4°C | 109 mm | 79% | 6 m/s | 2 |
| 2006 | 12.9°C | 11.5°C | 10.2°C | 15.4°C | 7.7°C | 85 mm | 79% | 6 m/s | 1.8 |
| 2005 | 13.8°C | 12.5°C | 11.2°C | 16.3°C | 8.6°C | 71 mm | 79% | 5.9 m/s | 1.9 |
| 2004 | 12.5°C | 11.3°C | 10.1°C | 15.3°C | 8.1°C | 114 mm | 79% | 6.6 m/s | 1.9 |
| 2003 | 13.3°C | 11.8°C | 10.2°C | 15.6°C | 8.3°C | 83 mm | 79% | 6.3 m/s | 2 |
| 2002 | 13.8°C | 12.1°C | 10.3°C | 16.3°C | 7.8°C | 103 mm | 79% | 7 m/s | 1.8 |
| 2001 🔥 | 13.9°C | 12.6°C | 11.4°C | 15.6°C | 9.0°C | 56 mm | 79% | 5 m/s | 1.9 |
| 2000 | 13.3°C | 12.0°C | 10.6°C | 16.5°C | 8.3°C | 98 mm | 79% | 6.2 m/s | 1.9 |
| 1999 | 14.1°C | 12.5°C | 10.8°C | 16.3°C | 8.4°C | 47 mm | 78% | 6 m/s | 1.8 |
| 1998 | 12.7°C | 11.3°C | 9.9°C | 15.7°C | 8.2°C | 88 mm | 78% | 5.6 m/s | 1.9 |
| 1997 | 12.5°C | 11.2°C | 9.8°C | 16.1°C | 7.6°C | 47 mm | 77% | 5.4 m/s | 2 |
| 1996 | 12.6°C | 11.2°C | 9.8°C | 16.3°C | 6.7°C | 144 mm | 82% | 6 m/s | 1.7 |
| 1995 | 12.1°C | 10.9°C | 9.8°C | 14.4°C | 6.8°C | 128 mm | 81% | 6.4 m/s | 1.8 |
| 1994 | 13.4°C | 11.7°C | 10.1°C | 17.0°C | 6.9°C | 82 mm | 80% | 6.1 m/s | 2.1 |
| 1993 | 13.3°C | 11.8°C | 10.2°C | 16.5°C | 8.6°C | 82 mm | 81% | 6.1 m/s | 1.9 |
| 1992 | 13.0°C | 11.5°C | 10.1°C | 14.8°C | 7.9°C | 101 mm | 81% | 6.5 m/s | 1.9 |
| 1991 | 13.0°C | 11.7°C | 10.5°C | 14.9°C | 8.7°C | 80 mm | 80% | 5.7 m/s | 2 |
| 1990 | 13.0°C | 11.7°C | 10.3°C | 16.6°C | 7.8°C | 131 mm | 81% | 6.7 m/s | 1.9 |
| 1989 | 12.2°C | 11.1°C | 9.9°C | 15.0°C | 7.0°C | 100 mm | 81% | 5.8 m/s | 2 |
| 1988 | 13.7°C | 12.4°C | 11.1°C | 16.1°C | 9.2°C | 92 mm | 82% | 6.2 m/s | 1.9 |
| 1987 | 12.7°C | 11.1°C | 9.5°C | 15.3°C | 7.6°C | 72 mm | 81% | 5.8 m/s | 2 |
| 1986 | 12.1°C | 10.8°C | 9.4°C | 14.5°C | 6.4°C | 128 mm | 83% | 6.2 m/s | 1.9 |
| 1985 | 12.7°C | 11.3°C | 9.9°C | 16.8°C | 7.3°C | 91 mm | 76% | 6.1 m/s | 2 |
| 1984 | 12.3°C | 11.0°C | 9.8°C | 14.8°C | 6.5°C | 138 mm | 81% | 5.9 m/s | 1.8 |
| 1983 | 12.3°C | 11.0°C | 9.8°C | 14.6°C | 6.2°C | 86 mm | 80% | 5.3 m/s | — |
| 1982 ❄️ | 12.2°C | 10.7°C | 9.2°C | 14.8°C | 7.1°C | 53 mm | 77% | 5.1 m/s | — |
| 1981 | 13.0°C | 11.4°C | 9.8°C | 15.5°C | 7.5°C | 134 mm | 81% | 6.8 m/s | — |
Actual recorded July data for each year, 1981–2025 — sourced from NASA POWER.
The average high in July is around 13.1°C with lows near 10.3°C (mean 11.7°C), based on 45 years of NASA POWER data.
July averages 92 mm of rainfall in Portland, a relatively wet time of year. The wettest on record was 153 mm in 2013.
The hottest July reached 17°C in 1994. The coldest dipped to 6.2°C in 1983.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average July temperatures have risen by about 0.9°C. Daytime highs moved from 12.5°C to 13.4°C and overnight lows from 9.7°C to 10.6°C over the same span.
July is one of the cooler months of the year in Portland and a relatively wet time of year, so plan for around 13.1°C daytime highs and 10.3°C at night.
Yes — July is the coldest month of the year in Portland, averaging 11.7°C.
For July in Portland, pack light layers you can adjust through the day, with typical highs of 13.1°C and lows of 10.3°C. Bring an umbrella or light rain jacket too.
Relative humidity in July averages 79% — quite humid.
Average wind speed in July is 6.1 m/s. The windiest July on record averaged 7.2 m/s (2018).
The wettest July on record was 2013 with 153 mm. On average, July sees 92 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.
