April is one of the cooler months of the year in Seattle, with average highs near 13.6°C and lows around 4.9°C (mean 9.3°C). It is about average for rainfall, averaging 96 mm of rainfall and 82% relative humidity across the period.
April is one of the cooler months of the year in Seattle. Across 45 years of records, the warmest April in Seattle was 2016 — when the month averaged 12.5°C — while the coldest was 2011 at 6.6°C. Typical April days reach 13.6°C with nights near 4.9°C. The long-term April temperature trend is broadly flat.
April is about average for rainfall in Seattle, averaging 96 mm of rainfall. The wettest Aprils on record were 1996 and 2018 with 169 mm, while the driest was 2004 at 30 mm.
Relative humidity in Seattle during April averages 82%. The most humid April was 2023 at 85%, and the least humid was 2021 at 76%.
April receives about 4.2 kWh/m²/day of solar energy in Seattle. The sunniest April was 2021 at 5.3 kWh/m²/day, and the cloudiest was 1996 at 3.4.
Average wind speed in Seattle during April is 0.8 m/s. The windiest Aprils were 1984, 1993 and 2018, among others at 0.9 m/s, while the calmest was 2025 at 0.5 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 9.1°C | 9.7°C | 9.0°C | 9.3°C | 9.0°C | -0.1°C |
| Avg High | 13.6°C | 14.1°C | 13.5°C | 13.5°C | 13.3°C | -0.3°C |
| Avg Low | 4.7°C | 5.2°C | 4.6°C | 5.1°C | 4.6°C | -0.1°C |
| Avg Rain | 90 mm | 108 mm | 80 mm | 113 mm | 81 mm | -9 mm |
April temperatures in Seattle have stayed relatively stable across the record.
April has ranged from a record low of -1.9°C (2008) to a record high of 30.5°C (2016).
Rainfall in April is about average for rainfall, averaging 96 mm, with a wettest year of 169 mm.
A good time to visit Seattle
April is a good time to visit Seattle, with days averaging 13.6°C and nights around 4.9°C (mean 9.3°C, cooler than Seattle'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 | 14.2°C | 9.6°C | 4.9°C | 19.9°C | 2.3°C | 70 mm | 82% | 0.5 m/s | 5 |
| 2024 | 13.0°C | 8.8°C | 4.6°C | 18.7°C | 1.8°C | 74 mm | 84% | 0.8 m/s | 4.6 |
| 2023 | 11.9°C | 8.1°C | 4.4°C | 26.7°C | 0.2°C | 132 mm | 85% | 0.8 m/s | 3.8 |
| 2022 | 11.2°C | 7.3°C | 3.5°C | 23.7°C | -1.4°C | 121 mm | 82% | 0.8 m/s | 4 |
| 2021 | 15.1°C | 10.2°C | 5.3°C | 24.4°C | 0.1°C | 37 mm | 76% | 0.7 m/s | 5.3 |
| 2020 | 14.4°C | 9.8°C | 5.2°C | 19.5°C | 0.9°C | 51 mm | 80% | 0.7 m/s | 4.8 |
| 2019 | 13.9°C | 9.7°C | 5.5°C | 19.3°C | 2.7°C | 98 mm | 84% | 0.8 m/s | 4 |
| 2018 | 13.5°C | 9.5°C | 5.4°C | 24.4°C | 0.9°C | 169 mm | 84% | 0.9 m/s | 3.7 |
| 2017 | 12.6°C | 9.0°C | 5.3°C | 18.0°C | 2.8°C | 142 mm | 85% | 0.8 m/s | 3.6 |
| 2016 🔥 | 17.4°C | 12.5°C | 7.6°C | 30.5°C | 3.7°C | 47 mm | 78% | 0.6 m/s | 4.7 |
| 2015 | 14.0°C | 9.3°C | 4.6°C | 23.4°C | 1.0°C | 55 mm | 81% | 0.7 m/s | 4.6 |
| 2014 | 14.0°C | 9.8°C | 5.6°C | 24.7°C | 3.6°C | 125 mm | 82% | 0.7 m/s | 4.3 |
| 2013 | 12.7°C | 8.9°C | 5.0°C | 20.4°C | 1.9°C | 139 mm | 83% | 0.8 m/s | 4 |
| 2012 | 13.4°C | 9.2°C | 5.0°C | 22.0°C | 0.5°C | 110 mm | 83% | 0.7 m/s | 4 |
| 2011 ❄️ | 10.4°C | 6.6°C | 2.8°C | 17.6°C | 0.6°C | 137 mm | 84% | 0.8 m/s | 3.8 |
| 2010 | 12.7°C | 8.6°C | 4.4°C | 18.6°C | -1.8°C | 107 mm | 82% | 0.8 m/s | 3.8 |
| 2009 | 13.6°C | 8.7°C | 3.8°C | 21.7°C | -0.7°C | 92 mm | 78% | 0.6 m/s | 4.5 |
| 2008 | 11.1°C | 6.7°C | 2.3°C | 20.6°C | -1.9°C | 66 mm | 82% | 0.7 m/s | 4 |
| 2007 | 13.2°C | 9.0°C | 4.8°C | 24.2°C | 0.1°C | 61 mm | 82% | 0.7 m/s | 4 |
| 2006 | 13.8°C | 9.2°C | 4.7°C | 21.8°C | 2.1°C | 80 mm | 82% | 0.7 m/s | 4.3 |
| 2005 | 14.1°C | 9.8°C | 5.6°C | 24.1°C | 1.8°C | 119 mm | 83% | 0.8 m/s | 4 |
| 2004 | 16.5°C | 11.1°C | 5.7°C | 25.3°C | 2.0°C | 30 mm | 78% | 0.7 m/s | 5.2 |
| 2003 | 12.5°C | 8.7°C | 4.9°C | 19.0°C | 0.7°C | 98 mm | 84% | 0.8 m/s | 3.6 |
| 2002 | 12.9°C | 8.8°C | 4.6°C | 18.6°C | 0.5°C | 92 mm | 82% | 0.8 m/s | 4.2 |
| 2001 | 12.4°C | 8.4°C | 4.4°C | 21.9°C | 0.1°C | 92 mm | 82% | 0.8 m/s | 4 |
| 2000 | 14.4°C | 9.8°C | 5.3°C | 20.7°C | 0.4°C | 66 mm | 82% | 0.8 m/s | 4.4 |
| 1999 | 13.3°C | 8.4°C | 3.4°C | 25.8°C | 0.0°C | 48 mm | 78% | 0.7 m/s | 4.5 |
| 1998 | 14.2°C | 9.4°C | 4.7°C | 27.3°C | 1.6°C | 42 mm | 80% | 0.7 m/s | 4.6 |
| 1997 | 13.6°C | 9.1°C | 4.6°C | 20.2°C | 0.1°C | 131 mm | 81% | 0.8 m/s | 4.1 |
| 1996 🌧️ | 14.2°C | 10.1°C | 6.1°C | 21.0°C | 0.9°C | 169 mm | 84% | 0.8 m/s | 3.4 |
| 1995 | 13.6°C | 9.2°C | 4.8°C | 19.9°C | 1.6°C | 89 mm | 81% | 0.7 m/s | 4.3 |
| 1994 | 14.8°C | 10.6°C | 6.3°C | 21.6°C | 1.4°C | 79 mm | 82% | 0.7 m/s | 3.7 |
| 1993 | 13.1°C | 9.2°C | 5.3°C | 18.9°C | 1.6°C | 159 mm | 84% | 0.9 m/s | 3.7 |
| 1992 | 15.1°C | 10.7°C | 6.3°C | 23.3°C | 1.7°C | 127 mm | 81% | 0.8 m/s | 3.9 |
| 1991 | 13.2°C | 8.9°C | 4.6°C | 20.6°C | 0.0°C | 162 mm | 82% | 0.8 m/s | 4.3 |
| 1990 | 15.6°C | 10.9°C | 6.2°C | 22.9°C | 3.3°C | 78 mm | 81% | 0.6 m/s | 4 |
| 1989 | 15.6°C | 10.6°C | 5.6°C | 24.2°C | 3.2°C | 67 mm | 80% | 0.8 m/s | 4.4 |
| 1988 | 14.2°C | 9.7°C | 5.2°C | 21.8°C | 0.6°C | 124 mm | 82% | 0.8 m/s | 3.6 |
| 1987 | 14.8°C | 10.3°C | 5.7°C | 26.3°C | 0.6°C | 92 mm | 81% | 0.8 m/s | 4.4 |
| 1986 | 12.3°C | 8.1°C | 3.9°C | 20.8°C | 1.1°C | 79 mm | 82% | 0.8 m/s | 3.7 |
| 1985 | 13.3°C | 9.1°C | 4.8°C | 21.5°C | -0.4°C | 77 mm | 82% | 0.8 m/s | 4.1 |
| 1984 | 11.9°C | 7.9°C | 3.9°C | 21.9°C | 0.8°C | 110 mm | 83% | 0.9 m/s | 4.1 |
| 1983 | 14.8°C | 9.9°C | 5.0°C | 23.0°C | 1.2°C | 48 mm | 78% | 0.7 m/s | — |
| 1982 | 12.0°C | 7.5°C | 3.1°C | 22.0°C | 0.4°C | 102 mm | 79% | 0.9 m/s | — |
| 1981 | 13.1°C | 9.0°C | 4.8°C | 22.3°C | 0.2°C | 110 mm | 84% | 0.9 m/s | — |
Actual recorded April data for each year, 1981–2025 — sourced from NASA POWER.
The average high in April is around 13.6°C with lows near 4.9°C (mean 9.3°C), based on 45 years of NASA POWER data.
April averages 96 mm of rainfall in Seattle, about average for rainfall. The wettest on record was 169 mm in 1996.
The hottest April reached 30.5°C in 2016. The coldest dipped to -1.9°C in 2008.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average April temperatures have risen by about 0.1°C. Daytime highs moved from 13°C to 13.1°C and overnight lows from 4.3°C to 4.5°C over the same span.
April is one of the cooler months of the year in Seattle and about average for rainfall, so plan for around 13.6°C daytime highs and 4.9°C at night.
Not quite — April is the 6th coolest month in Seattle, averaging 9.3°C.
For April in Seattle, pack warm layers and a jacket for chilly mornings, with typical highs of 13.6°C and lows of 4.9°C. Bring an umbrella or light rain jacket too.
Relative humidity in April averages 82% — quite humid.
Average wind speed in April is 0.8 m/s. The windiest April on record averaged 0.9 m/s (1981).
The wettest April on record was 1996 with 169 mm. On average, April sees 96 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 Seattle 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.
