April is one of the cooler months of the year in Portland, with average highs near 7.6°C and lows around 3.4°C (mean 5.5°C). It is about average for rainfall, averaging 116 mm of rainfall and 84% relative humidity across the period.
April is one of the cooler months of the year in Portland. Across 45 years of records, the warmest April in Portland was 2010 — when the month averaged 7.8°C — while the coldest was 2003 at 3.6°C. Typical April days reach 7.6°C with nights near 3.4°C. The long-term trend is warming, about 0.3°C per decade.
April is about average for rainfall in Portland, averaging 116 mm of rainfall. The wettest April on record was 2007 with 240 mm, while the driest was 1999 at 14 mm.
Relative humidity in Portland during April averages 84%. The most humid April was 1983 at 89%, and the least humid was 2016 at 78%.
April receives about 4.6 kWh/m²/day of solar energy in Portland. The sunniest April was 2012 at 5.5 kWh/m²/day, and the cloudiest was 2000 at 3.7.
Average wind speed in Portland during April is 3.6 m/s. The windiest April was 1982 at 5 m/s, while the calmest was 2010 at 2.9 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 5.2°C | 5.0°C | 5.4°C | 5.9°C | 6.1°C | +0.9°C |
| Avg High | 7.3°C | 7.2°C | 7.6°C | 8.1°C | 8.2°C | +0.9°C |
| Avg Low | 3.1°C | 2.8°C | 3.3°C | 3.8°C | 4.1°C | +1°C |
| Avg Rain | 113 mm | 102 mm | 129 mm | 114 mm | 122 mm | +9 mm |
April temperatures in Portland have risen by about 1.1°C between 1981–1985 and 2021–2025.
April has ranged from a record low of -7.8°C (1995) to a record high of 18.6°C (2002).
Rainfall in April is about average for rainfall, averaging 116 mm, with a wettest year of 240 mm.
A good time to visit Portland
April is a good time to visit Portland, with days averaging 7.6°C and nights around 3.4°C (mean 5.5°C, cooler than Portland's yearly average) and higher rainfall. August and July 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 | 8.1°C | 5.9°C | 3.7°C | 15.5°C | -1.6°C | 100 mm | 82% | 3.7 m/s | 4.6 |
| 2024 | 8.0°C | 6.1°C | 4.3°C | 14.1°C | -0.1°C | 88 mm | 84% | 3.8 m/s | 4.6 |
| 2023 | 8.4°C | 6.6°C | 4.8°C | 13.9°C | 0.1°C | 173 mm | 83% | 3.5 m/s | 4.2 |
| 2022 | 8.5°C | 6.4°C | 4.3°C | 11.2°C | 1.8°C | 134 mm | 81% | 3.9 m/s | 4.5 |
| 2021 | 8.9°C | 6.7°C | 4.5°C | 13.4°C | -1.4°C | 92 mm | 83% | 3.6 m/s | 4.7 |
| 2020 | 7.1°C | 5.2°C | 3.3°C | 11.5°C | 1.3°C | 144 mm | 81% | 4.4 m/s | 4.5 |
| 2019 | 7.7°C | 5.6°C | 3.6°C | 11.6°C | -0.8°C | 140 mm | 85% | 4 m/s | 4.1 |
| 2018 | 6.7°C | 4.6°C | 2.6°C | 11.4°C | -2.2°C | 179 mm | 82% | 3.8 m/s | 4.4 |
| 2017 | 8.6°C | 6.6°C | 4.6°C | 15.6°C | 0.5°C | 162 mm | 88% | 3.5 m/s | 4.2 |
| 2016 | 7.6°C | 5.1°C | 2.6°C | 14.5°C | -4.2°C | 66 mm | 78% | 3.6 m/s | 5.2 |
| 2015 | 7.4°C | 5.3°C | 3.1°C | 11.5°C | -1.3°C | 117 mm | 82% | 3.5 m/s | 4.6 |
| 2014 | 7.2°C | 5.1°C | 3.1°C | 11.0°C | -1.3°C | 81 mm | 83% | 3.8 m/s | 4.9 |
| 2013 | 7.9°C | 5.8°C | 3.7°C | 12.7°C | -1.4°C | 57 mm | 81% | 3.9 m/s | 5.2 |
| 2012 | 9.6°C | 7.3°C | 5.0°C | 17.3°C | 1.8°C | 116 mm | 81% | 3.5 m/s | 5.5 |
| 2011 | 8.0°C | 6.0°C | 4.1°C | 13.1°C | 0.8°C | 169 mm | 85% | 3.7 m/s | 4.2 |
| 2010 🔥 | 10.0°C | 7.8°C | 5.5°C | 15.5°C | 2.5°C | 58 mm | 85% | 2.9 m/s | 4.9 |
| 2009 | 8.4°C | 6.3°C | 4.2°C | 16.3°C | 1.2°C | 122 mm | 84% | 3.5 m/s | 5.1 |
| 2008 | 8.3°C | 6.3°C | 4.3°C | 14.8°C | 0.3°C | 120 mm | 84% | 3.2 m/s | 5.1 |
| 2007 🌧️ | 6.3°C | 4.4°C | 2.5°C | 14.1°C | -1.1°C | 240 mm | 85% | 4.1 m/s | 4.1 |
| 2006 | 8.2°C | 6.2°C | 4.2°C | 11.8°C | 1.6°C | 75 mm | 83% | 3.4 m/s | 4.9 |
| 2005 | 8.0°C | 5.9°C | 3.9°C | 16.2°C | 1.0°C | 199 mm | 85% | 3.4 m/s | 4.8 |
| 2004 | 7.3°C | 5.0°C | 2.7°C | 14.0°C | -1.2°C | 145 mm | 85% | 3.6 m/s | 4.5 |
| 2003 ❄️ | 5.7°C | 3.6°C | 1.5°C | 14.3°C | -3.1°C | 80 mm | 81% | 3.3 m/s | 4.4 |
| 2002 | 8.4°C | 5.9°C | 3.5°C | 18.6°C | -1.0°C | 118 mm | 83% | 3.7 m/s | 4.6 |
| 2001 | 7.4°C | 5.0°C | 2.5°C | 14.4°C | -1.6°C | 34 mm | 82% | 3.1 m/s | 5 |
| 2000 | 7.6°C | 5.5°C | 3.4°C | 12.2°C | 1.2°C | 158 mm | 84% | 4.3 m/s | 3.7 |
| 1999 | 8.3°C | 5.9°C | 3.5°C | 11.0°C | 0.5°C | 14 mm | 80% | 3.1 m/s | 5.2 |
| 1998 | 8.5°C | 6.2°C | 3.8°C | 13.5°C | 0.4°C | 87 mm | 83% | 3.1 m/s | 4.8 |
| 1997 | 6.9°C | 4.6°C | 2.2°C | 11.0°C | -3.2°C | 139 mm | 82% | 4 m/s | 5 |
| 1996 | 6.6°C | 4.7°C | 2.7°C | 12.6°C | -2.3°C | 161 mm | 86% | 4.1 m/s | 4.5 |
| 1995 | 6.4°C | 4.0°C | 1.6°C | 10.2°C | -7.8°C | 57 mm | 80% | 3.4 m/s | 4.8 |
| 1994 | 7.7°C | 5.6°C | 3.4°C | 13.0°C | -1.5°C | 84 mm | 85% | 3.5 m/s | 4.6 |
| 1993 | 6.5°C | 4.7°C | 2.8°C | 10.2°C | -0.8°C | 147 mm | 87% | 3.7 m/s | 4.2 |
| 1992 | 5.9°C | 3.8°C | 1.7°C | 11.6°C | -2.8°C | 64 mm | 83% | 3.7 m/s | 4.9 |
| 1991 | 7.9°C | 5.7°C | 3.6°C | 13.4°C | 0.7°C | 143 mm | 86% | 3.1 m/s | 4.7 |
| 1990 | 7.1°C | 5.1°C | 3.0°C | 17.4°C | -0.2°C | 124 mm | 87% | 3.7 m/s | 4.4 |
| 1989 | 6.3°C | 4.3°C | 2.3°C | 10.0°C | -0.5°C | 97 mm | 82% | 3.5 m/s | 4.6 |
| 1988 | 6.9°C | 5.1°C | 3.2°C | 9.7°C | 0.3°C | 111 mm | 86% | 3.9 m/s | 4.1 |
| 1987 | 7.0°C | 5.2°C | 3.3°C | 9.9°C | -0.4°C | 156 mm | 88% | 3.5 m/s | 4 |
| 1986 | 8.1°C | 6.1°C | 4.2°C | 12.1°C | 0.9°C | 93 mm | 86% | 3.2 m/s | 5.2 |
| 1985 | 7.4°C | 5.1°C | 2.9°C | 14.8°C | -2.4°C | 37 mm | 80% | 3.4 m/s | 4.9 |
| 1984 | 7.2°C | 5.1°C | 3.0°C | 11.9°C | -1.8°C | 128 mm | 86% | 3.4 m/s | 4.2 |
| 1983 | 7.5°C | 5.7°C | 4.0°C | 13.5°C | 1.1°C | 202 mm | 89% | 3.6 m/s | — |
| 1982 | 6.6°C | 4.1°C | 1.5°C | 13.4°C | -7.7°C | 103 mm | 83% | 5 m/s | — |
| 1981 | 8.7°C | 6.1°C | 3.6°C | 13.7°C | -1.7°C | 93 mm | 82% | 4 m/s | — |
Actual recorded April data for each year, 1981–2025 — sourced from NASA POWER.
The average high in April is around 7.6°C with lows near 3.4°C (mean 5.5°C), based on 45 years of NASA POWER data.
April averages 116 mm of rainfall in Portland, about average for rainfall. The wettest on record was 240 mm in 2007.
The hottest April reached 18.6°C in 2002. The coldest dipped to -7.8°C in 1995.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average April temperatures have risen by about 1.1°C. Daytime highs moved from 7.5°C to 8.4°C and overnight lows from 3°C to 4.3°C over the same span.
April is one of the cooler months of the year in Portland and about average for rainfall, so plan for around 7.6°C daytime highs and 3.4°C at night.
Not quite — April is the 5th coolest month in Portland, averaging 5.5°C.
For April in Portland, pack warm layers and a jacket for chilly mornings, with typical highs of 7.6°C and lows of 3.4°C. Bring an umbrella or light rain jacket too.
Relative humidity in April averages 84% — quite humid.
Average wind speed in April is 3.6 m/s. The windiest April on record averaged 5 m/s (1982).
The wettest April on record was 2007 with 240 mm. On average, April sees 116 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.
