April is one of the warmer months of the year in Portland, with average highs near 17.4°C and lows around 13.7°C (mean 15.6°C). It is one of the drier months, averaging 50 mm of rainfall and 75% relative humidity across the period.
April is one of the warmer months of the year in Portland. Across 45 years of records, the warmest April in Portland was 2025 — when the month averaged 17°C — while the coldest was 1995 at 13.5°C. Typical April days reach 17.4°C with nights near 13.7°C. The long-term trend is warming, about 0.2°C per decade.
April is one of the drier months in Portland, averaging 50 mm of rainfall. The wettest April on record was 1992 with 121 mm, while the driest was 1993 at 8 mm.
Relative humidity in Portland during April averages 75%. The most humid April was 2011 at 80%, and the least humid was 2019 at 70%.
April receives about 3.2 kWh/m²/day of solar energy in Portland. The sunniest Aprils were 1993 and 2003 at 3.6 kWh/m²/day, and the cloudiest were 2006 and 2020 at 2.8.
Average wind speed in Portland during April is 4.9 m/s. The windiest April was 1995 at 6.1 m/s, while the calmest was 2002 at 3.9 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 15.5°C | 15.0°C | 15.6°C | 15.9°C | 15.8°C | +0.3°C |
| Avg High | 17.4°C | 16.8°C | 17.5°C | 17.7°C | 17.5°C | +0.1°C |
| Avg Low | 13.6°C | 13.3°C | 13.8°C | 14.1°C | 14.2°C | +0.6°C |
| Avg Rain | 53 mm | 52 mm | 53 mm | 49 mm | 41 mm | -12 mm |
April temperatures in Portland have risen by about 0.7°C between 1981–1985 and 2021–2025.
April has ranged from a record low of 9.6°C (2009) to a record high of 27°C (1992).
Rainfall in April is one of the drier months, averaging 50 mm, with a wettest year of 121 mm.
A good time to visit Portland
April is a good time to visit Portland, with days averaging 17.4°C and nights around 13.7°C (mean 15.6°C, warmer than Portland's yearly average) and moderate rainfall. February and January are marginally more temperate, but April still suits most travellers.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 🔥 | 18.8°C | 17.0°C | 15.2°C | 25.2°C | 13.0°C | 29 mm | 76% | 4.5 m/s | 3.3 |
| 2024 | 16.3°C | 15.0°C | 13.7°C | 20.7°C | 11.6°C | 50 mm | 76% | 4.6 m/s | 3 |
| 2023 | 17.6°C | 15.9°C | 14.2°C | 22.8°C | 12.7°C | 54 mm | 78% | 4.7 m/s | 3.2 |
| 2022 | 18.0°C | 16.3°C | 14.7°C | 22.1°C | 12.6°C | 17 mm | 76% | 4.7 m/s | 3.1 |
| 2021 | 17.3°C | 15.7°C | 14.0°C | 25.5°C | 10.6°C | 29 mm | 74% | 5.2 m/s | 3.2 |
| 2020 | 16.7°C | 15.0°C | 13.3°C | 21.5°C | 10.1°C | 66 mm | 76% | 5.7 m/s | 2.8 |
| 2019 | 18.2°C | 16.0°C | 13.8°C | 25.5°C | 12.3°C | 13 mm | 70% | 5.1 m/s | 3 |
| 2018 | 18.4°C | 16.5°C | 14.6°C | 24.2°C | 12.4°C | 18 mm | 75% | 4.5 m/s | 3.4 |
| 2017 | 17.7°C | 15.9°C | 14.1°C | 23.6°C | 12.1°C | 80 mm | 77% | 4.6 m/s | 3.1 |
| 2016 | 18.1°C | 16.2°C | 14.3°C | 23.9°C | 12.6°C | 27 mm | 73% | 4.6 m/s | 3.3 |
| 2015 | 15.6°C | 14.3°C | 13.0°C | 22.5°C | 11.4°C | 41 mm | 77% | 4.9 m/s | 2.9 |
| 2014 | 17.8°C | 16.0°C | 14.2°C | 26.2°C | 10.8°C | 76 mm | 77% | 4.9 m/s | 3.2 |
| 2013 | 17.5°C | 15.8°C | 14.1°C | 23.7°C | 12.5°C | 34 mm | 74% | 5.1 m/s | 3.2 |
| 2012 | 18.6°C | 16.4°C | 14.2°C | 24.7°C | 11.9°C | 34 mm | 74% | 5.1 m/s | 3.5 |
| 2011 | 17.1°C | 15.3°C | 13.5°C | 22.5°C | 11.9°C | 88 mm | 80% | 4.7 m/s | 3.3 |
| 2010 | 17.9°C | 16.4°C | 14.8°C | 22.0°C | 11.9°C | 76 mm | 78% | 5 m/s | 2.9 |
| 2009 | 17.0°C | 15.2°C | 13.5°C | 25.3°C | 9.6°C | 80 mm | 74% | 5.1 m/s | 3.3 |
| 2008 | 17.3°C | 15.3°C | 13.3°C | 22.5°C | 9.8°C | 47 mm | 75% | 4.7 m/s | 3.4 |
| 2007 | 18.4°C | 16.4°C | 14.5°C | 24.2°C | 12.7°C | 52 mm | 76% | 4.6 m/s | 3.3 |
| 2006 | 16.1°C | 14.5°C | 13.0°C | 19.7°C | 11.8°C | 92 mm | 73% | 5.8 m/s | 2.8 |
| 2005 | 18.7°C | 16.5°C | 14.2°C | 26.5°C | 12.6°C | 37 mm | 74% | 4.9 m/s | 3.5 |
| 2004 | 16.5°C | 15.0°C | 13.4°C | 22.3°C | 12.2°C | 54 mm | 77% | 4.8 m/s | 3.1 |
| 2003 | 17.4°C | 15.6°C | 13.8°C | 21.5°C | 12.3°C | 29 mm | 78% | 4.8 m/s | 3.6 |
| 2002 | 18.2°C | 16.3°C | 14.3°C | 24.7°C | 11.8°C | 33 mm | 76% | 3.9 m/s | 3.4 |
| 2001 | 17.2°C | 15.3°C | 13.5°C | 23.3°C | 11.5°C | 52 mm | 74% | 5.3 m/s | 3.1 |
| 2000 | 17.9°C | 16.1°C | 14.3°C | 23.1°C | 11.5°C | 59 mm | 75% | 4.9 m/s | 3.5 |
| 1999 | 16.2°C | 14.7°C | 13.2°C | 21.1°C | 10.8°C | 23 mm | 75% | 4.2 m/s | 3.2 |
| 1998 | 16.2°C | 14.6°C | 13.1°C | 24.3°C | 11.7°C | 79 mm | 75% | 4.7 m/s | 2.9 |
| 1997 | 17.3°C | 15.2°C | 13.2°C | 23.1°C | 10.4°C | 16 mm | 74% | 4.7 m/s | 3.2 |
| 1996 | 15.6°C | 14.3°C | 13.0°C | 18.7°C | 11.4°C | 50 mm | 76% | 5.7 m/s | 3 |
| 1995 ❄️ | 15.5°C | 13.5°C | 11.5°C | 21.2°C | 9.7°C | 115 mm | 76% | 6.1 m/s | 3.2 |
| 1994 | 17.4°C | 15.4°C | 13.4°C | 24.3°C | 11.3°C | 46 mm | 75% | 5 m/s | 3.3 |
| 1993 | 18.2°C | 16.1°C | 14.0°C | 24.2°C | 11.8°C | 8 mm | 73% | 4.2 m/s | 3.6 |
| 1992 🌧️ | 17.1°C | 15.3°C | 13.4°C | 27.0°C | 10.9°C | 121 mm | 77% | 4.3 m/s | 3.1 |
| 1991 | 16.9°C | 15.1°C | 13.2°C | 25.5°C | 10.7°C | 26 mm | 75% | 5 m/s | 3.2 |
| 1990 | 17.8°C | 16.1°C | 14.5°C | 24.5°C | 12.9°C | 39 mm | 76% | 5.7 m/s | 3.3 |
| 1989 | 17.9°C | 16.1°C | 14.4°C | 23.9°C | 12.8°C | 53 mm | 78% | 4.9 m/s | 3 |
| 1988 | 17.7°C | 15.9°C | 14.1°C | 22.9°C | 11.8°C | 21 mm | 78% | 5.1 m/s | 2.9 |
| 1987 | 17.5°C | 15.4°C | 13.3°C | 24.7°C | 10.0°C | 38 mm | 73% | 4.4 m/s | 3.2 |
| 1986 | 17.2°C | 15.3°C | 13.4°C | 23.7°C | 11.3°C | 94 mm | 73% | 5.9 m/s | 3.3 |
| 1985 | 17.9°C | 15.9°C | 13.9°C | 25.4°C | 10.3°C | 76 mm | 76% | 4.8 m/s | 3.5 |
| 1984 | 17.0°C | 15.2°C | 13.5°C | 22.2°C | 11.9°C | 41 mm | 76% | 5 m/s | 3.1 |
| 1983 | 15.2°C | 13.6°C | 11.9°C | 20.2°C | 10.3°C | 79 mm | 76% | 5 m/s | — |
| 1982 | 17.6°C | 15.6°C | 13.6°C | 24.0°C | 9.8°C | 55 mm | 73% | 4.9 m/s | — |
| 1981 | 18.4°C | 16.2°C | 14.0°C | 24.5°C | 10.1°C | 22 mm | 72% | 5.4 m/s | — |
Actual recorded April data for each year, 1981–2025 — sourced from NASA POWER.
The average high in April is around 17.4°C with lows near 13.7°C (mean 15.6°C), based on 45 years of NASA POWER data.
April averages 50 mm of rainfall in Portland, one of the drier months. The wettest on record was 121 mm in 1992.
The hottest April reached 27°C in 1992. The coldest dipped to 9.6°C in 2009.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average April temperatures have risen by about 0.7°C. Daytime highs moved from 17.2°C to 17.6°C and overnight lows from 13.4°C to 14.4°C over the same span.
April is one of the warmer months of the year in Portland and one of the drier months, so plan for around 17.4°C daytime highs and 13.7°C at night.
Not quite — April is the 8th coolest month in Portland, averaging 15.6°C.
For April in Portland, pack light layers you can adjust through the day, with typical highs of 17.4°C and lows of 13.7°C. Bring an umbrella or light rain jacket too.
Relative humidity in April averages 75% — quite humid.
Average wind speed in April is 4.9 m/s. The windiest April on record averaged 6.1 m/s (1995).
The wettest April on record was 1992 with 121 mm. On average, April sees 50 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 April, 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 April specifically, along with year-by-year records and how the month has changed over the decades.
