May is one of the warmer months of the year in Spokane, with average highs near 18.6°C and lows around 5.8°C (mean 12.2°C). It is about average for rainfall, averaging 48 mm of rainfall and 64% relative humidity across the period.
May is one of the warmer months of the year in Spokane. Across 45 years of records, the warmest May in Spokane was 2023 — when the month averaged 16.2°C — while the coldest was 1984 at 8.9°C. Typical May days reach 18.6°C with nights near 5.8°C. The long-term trend is warming, about 0.3°C per decade.
May is about average for rainfall in Spokane, averaging 48 mm of rainfall. The wettest May on record was 2020 with 110 mm, while the driest was 1992 at 12 mm.
Relative humidity in Spokane during May averages 64%. The most humid May was 1998 at 72%, and the least humid was 1992 at 53%.
May receives about 5.9 kWh/m²/day of solar energy in Spokane. The sunniest Mays were 1992, 2001 and 2009 at 6.7 kWh/m²/day, and the cloudiest was 2022 at 4.8.
Average wind speed in Spokane during May is 2 m/s. The windiest May was 1984 at 2.5 m/s, while the calmest were 2017 and 2023 at 1.6 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 11.7°C | 12.0°C | 12.1°C | 12.7°C | 12.4°C | +0.7°C |
| Avg High | 18.2°C | 18.4°C | 18.6°C | 19.1°C | 18.9°C | +0.7°C |
| Avg Low | 5.3°C | 5.8°C | 5.7°C | 6.3°C | 6.0°C | +0.7°C |
| Avg Rain | 44 mm | 55 mm | 46 mm | 46 mm | 52 mm | +8 mm |
May temperatures in Spokane have risen by about 1.2°C between 1981–1985 and 2021–2025.
May has ranged from a record low of -3.2°C (2010) to a record high of 34.2°C (1986).
Rainfall in May is about average for rainfall, averaging 48 mm, with a wettest year of 110 mm.
A good time to visit Spokane
May is a good time to visit Spokane, with days averaging 18.6°C and nights around 5.8°C (mean 12.2°C, warmer than Spokane's yearly average) and moderate rainfall. July and August are marginally more temperate, but May still suits most travellers.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 19.5°C | 12.5°C | 5.6°C | 29.2°C | -0.8°C | 39 mm | 65% | 2 m/s | 6.1 |
| 2024 | 17.7°C | 11.2°C | 4.7°C | 26.7°C | -2.1°C | 49 mm | 65% | 2.2 m/s | 5.9 |
| 2023 🔥 | 22.6°C | 16.2°C | 9.8°C | 30.2°C | 4.7°C | 43 mm | 66% | 1.6 m/s | 6.3 |
| 2022 | 15.3°C | 9.6°C | 4.0°C | 21.4°C | -1.5°C | 56 mm | 72% | 2.1 m/s | 4.8 |
| 2021 | 19.9°C | 12.9°C | 5.9°C | 28.2°C | 0.6°C | 13 mm | 55% | 2.2 m/s | 6.4 |
| 2020 🌧️ | 18.4°C | 12.2°C | 5.9°C | 29.7°C | -0.2°C | 110 mm | 67% | 2.3 m/s | 5.5 |
| 2019 | 20.4°C | 14.0°C | 7.5°C | 26.9°C | 1.3°C | 50 mm | 64% | 2 m/s | 6.3 |
| 2018 | 22.0°C | 15.6°C | 9.2°C | 28.9°C | 3.5°C | 50 mm | 67% | 1.7 m/s | 6.2 |
| 2017 | 19.4°C | 12.8°C | 6.3°C | 30.4°C | 0.1°C | 43 mm | 64% | 1.6 m/s | 6 |
| 2016 | 19.7°C | 13.5°C | 7.2°C | 26.7°C | 3.0°C | 36 mm | 65% | 2.2 m/s | 6 |
| 2015 | 20.9°C | 14.2°C | 7.5°C | 26.8°C | 1.8°C | 36 mm | 62% | 1.8 m/s | 6.5 |
| 2014 | 19.7°C | 13.1°C | 6.5°C | 26.9°C | 0.5°C | 26 mm | 61% | 2 m/s | 6.3 |
| 2013 | 19.5°C | 12.7°C | 6.0°C | 29.1°C | -1.7°C | 34 mm | 63% | 1.8 m/s | 6 |
| 2012 | 17.4°C | 11.2°C | 5.0°C | 29.2°C | -0.8°C | 36 mm | 62% | 2.2 m/s | 6 |
| 2011 | 16.1°C | 10.1°C | 4.1°C | 23.0°C | -1.1°C | 87 mm | 69% | 2.2 m/s | 5.3 |
| 2010 | 15.8°C | 9.7°C | 3.7°C | 25.1°C | -3.2°C | 64 mm | 65% | 2.1 m/s | 5.4 |
| 2009 | 19.0°C | 12.2°C | 5.4°C | 29.5°C | -0.5°C | 41 mm | 61% | 2.2 m/s | 6.7 |
| 2008 | 18.9°C | 12.3°C | 5.8°C | 28.8°C | -2.5°C | 30 mm | 65% | 2 m/s | 5.7 |
| 2007 | 19.6°C | 12.5°C | 5.5°C | 28.2°C | -1.7°C | 32 mm | 61% | 1.9 m/s | 6.4 |
| 2006 | 19.5°C | 12.9°C | 6.4°C | 32.3°C | -1.8°C | 46 mm | 62% | 1.9 m/s | 6.2 |
| 2005 | 19.7°C | 13.3°C | 6.9°C | 29.1°C | 1.7°C | 69 mm | 65% | 2 m/s | 5.6 |
| 2004 | 17.8°C | 12.1°C | 6.4°C | 25.5°C | 2.3°C | 73 mm | 66% | 2.1 m/s | 5.2 |
| 2003 | 17.5°C | 11.4°C | 5.2°C | 31.3°C | -1.9°C | 45 mm | 66% | 2 m/s | 5.4 |
| 2002 | 16.7°C | 10.6°C | 4.5°C | 24.6°C | -3.1°C | 40 mm | 64% | 2 m/s | 5.5 |
| 2001 | 20.3°C | 12.8°C | 5.4°C | 32.4°C | -1.6°C | 26 mm | 54% | 2.3 m/s | 6.7 |
| 2000 | 17.2°C | 11.1°C | 5.1°C | 23.6°C | -1.2°C | 54 mm | 65% | 2.2 m/s | 5.7 |
| 1999 | 16.0°C | 9.7°C | 3.4°C | 29.4°C | -3.1°C | 32 mm | 64% | 2.1 m/s | 6 |
| 1998 | 18.0°C | 12.2°C | 6.5°C | 26.5°C | 1.2°C | 100 mm | 72% | 2.2 m/s | 5.5 |
| 1997 | 19.4°C | 13.2°C | 7.1°C | 27.5°C | -1.8°C | 55 mm | 68% | 1.8 m/s | 6 |
| 1996 | 14.5°C | 9.1°C | 3.7°C | 22.9°C | -1.5°C | 65 mm | 70% | 2.1 m/s | 5.4 |
| 1995 | 19.2°C | 12.6°C | 6.0°C | 28.2°C | 2.1°C | 35 mm | 64% | 2 m/s | 6.4 |
| 1994 | 20.0°C | 13.3°C | 6.7°C | 28.3°C | 0.6°C | 42 mm | 62% | 1.9 m/s | 5.6 |
| 1993 | 21.6°C | 14.9°C | 8.3°C | 31.3°C | 1.6°C | 47 mm | 66% | 2.2 m/s | 6 |
| 1992 | 22.2°C | 14.4°C | 6.6°C | 30.0°C | -0.7°C | 12 mm | 53% | 2 m/s | 6.7 |
| 1991 | 16.6°C | 10.5°C | 4.5°C | 22.2°C | 0.4°C | 74 mm | 69% | 2.1 m/s | 5 |
| 1990 | 16.2°C | 10.5°C | 4.8°C | 27.9°C | -0.4°C | 87 mm | 69% | 2 m/s | 4.9 |
| 1989 | 17.1°C | 11.1°C | 5.0°C | 24.1°C | 0.8°C | 69 mm | 66% | 2.1 m/s | 5.5 |
| 1988 | 18.7°C | 12.1°C | 5.4°C | 30.3°C | -2.8°C | 46 mm | 62% | 2.1 m/s | 5.5 |
| 1987 | 20.4°C | 13.7°C | 6.9°C | 30.5°C | 1.4°C | 38 mm | 61% | 2.1 m/s | 5.8 |
| 1986 | 19.0°C | 12.5°C | 6.0°C | 34.2°C | -0.2°C | 36 mm | 63% | 2 m/s | 5.9 |
| 1985 | 19.5°C | 12.9°C | 6.3°C | 28.9°C | -1.8°C | 35 mm | 62% | 2 m/s | 6.1 |
| 1984 ❄️ | 14.7°C | 8.9°C | 3.1°C | 27.8°C | -1.4°C | 58 mm | 69% | 2.5 m/s | 5.3 |
| 1983 | 19.6°C | 12.6°C | 5.6°C | 30.6°C | 0.1°C | 32 mm | 64% | 2.2 m/s | — |
| 1982 | 17.6°C | 10.9°C | 4.2°C | 26.0°C | -2.7°C | 19 mm | 62% | 2 m/s | — |
| 1981 | 17.1°C | 11.0°C | 5.0°C | 26.3°C | -1.3°C | 64 mm | 68% | 1.7 m/s | — |
Actual recorded May data for each year, 1981–2025 — sourced from NASA POWER.
The average high in May is around 18.6°C with lows near 5.8°C (mean 12.2°C), based on 45 years of NASA POWER data.
May averages 48 mm of rainfall in Spokane, about average for rainfall. The wettest on record was 110 mm in 2020.
The hottest May reached 34.2°C in 1986. The coldest dipped to -3.2°C in 2010.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average May temperatures have risen by about 1.2°C. Daytime highs moved from 17.7°C to 19°C and overnight lows from 4.8°C to 6°C over the same span.
May is one of the warmer months of the year in Spokane and about average for rainfall, so plan for around 18.6°C daytime highs and 5.8°C at night.
Not quite — May is the 8th coolest month in Spokane, averaging 12.2°C.
For May in Spokane, pack warm layers and a jacket for chilly mornings, with typical highs of 18.6°C and lows of 5.8°C.
Relative humidity in May averages 64% — moderately humid.
Average wind speed in May is 2 m/s. The windiest May on record averaged 2.5 m/s (1984).
The wettest May on record was 2020 with 110 mm. On average, May sees 48 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 Spokane behaves each May, 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 May specifically, along with year-by-year records and how the month has changed over the decades.
