May is one of the warmer months of the year in Pasco, with average highs near 22.5°C and lows around 9°C (mean 15.8°C). It is about average for rainfall, averaging 29 mm of rainfall and 54% relative humidity across the period.
May is one of the warmer months of the year in Pasco. Across 45 years of records, the warmest May in Pasco was 2023 — when the month averaged 19.4°C — while the coldest were 1984 and 1996 at 12.8°C. Typical May days reach 22.5°C with nights near 9°C. The long-term trend is warming, about 0.3°C per decade.
May is about average for rainfall in Pasco, averaging 29 mm of rainfall. The wettest May on record was 2020 with 63 mm, while the driest were 1992 and 2021 at 6 mm.
Relative humidity in Pasco during May averages 54%. The most humid May was 2022 at 61%, and the least humid was 1992 at 43%.
May receives about 6.4 kWh/m²/day of solar energy in Pasco. The sunniest May was 2009 at 7.2 kWh/m²/day, and the cloudiest was 1998 at 5.6.
Average wind speed in Pasco during May is 2.4 m/s. The windiest May was 1984 at 2.9 m/s, while the calmest was 2018 at 1.9 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 15.2°C | 15.6°C | 15.9°C | 16.1°C | 15.8°C | +0.6°C |
| Avg High | 22.0°C | 22.3°C | 22.7°C | 22.8°C | 22.6°C | +0.6°C |
| Avg Low | 8.4°C | 8.9°C | 9.1°C | 9.4°C | 9.0°C | +0.6°C |
| Avg Rain | 26 mm | 33 mm | 27 mm | 30 mm | 33 mm | +7 mm |
May temperatures in Pasco have risen by about 1°C between 1981–1985 and 2021–2025.
May has ranged from a record low of -0.3°C (1999) to a record high of 38.4°C (1986).
Rainfall in May is about average for rainfall, averaging 29 mm, with a wettest year of 63 mm.
A good time to visit Pasco
May is a good time to visit Pasco, with days averaging 22.5°C and nights around 9°C (mean 15.8°C, warmer than Pasco's yearly average) and low rainfall. August and June 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 | 22.2°C | 14.9°C | 7.7°C | 30.7°C | 1.0°C | 31 mm | 58% | 2.4 m/s | 6.8 |
| 2024 | 21.9°C | 14.8°C | 7.7°C | 30.4°C | 1.2°C | 35 mm | 55% | 2.6 m/s | 6.8 |
| 2023 🔥 | 26.2°C | 19.4°C | 12.5°C | 34.1°C | 6.7°C | 16 mm | 53% | 2.1 m/s | 6.8 |
| 2022 | 18.8°C | 12.9°C | 7.0°C | 25.0°C | 1.5°C | 47 mm | 61% | 2.5 m/s | 5.9 |
| 2021 | 23.7°C | 16.6°C | 9.6°C | 32.3°C | 4.0°C | 6 mm | 44% | 2.5 m/s | 7.1 |
| 2020 🌧️ | 22.7°C | 16.0°C | 9.3°C | 35.0°C | 3.8°C | 63 mm | 55% | 2.6 m/s | 6.4 |
| 2019 | 24.3°C | 17.4°C | 10.6°C | 31.1°C | 4.6°C | 24 mm | 53% | 2.3 m/s | 6.4 |
| 2018 | 25.4°C | 18.8°C | 12.2°C | 31.4°C | 5.4°C | 27 mm | 56% | 1.9 m/s | 6.6 |
| 2017 | 22.8°C | 15.9°C | 9.1°C | 33.2°C | 2.5°C | 23 mm | 57% | 2 m/s | 6.6 |
| 2016 | 23.7°C | 17.1°C | 10.5°C | 30.6°C | 6.6°C | 34 mm | 54% | 2.5 m/s | 6.7 |
| 2015 | 24.7°C | 17.8°C | 11.0°C | 32.7°C | 4.7°C | 35 mm | 52% | 2 m/s | 6.8 |
| 2014 | 23.8°C | 16.8°C | 9.8°C | 30.4°C | 4.9°C | 14 mm | 50% | 2.5 m/s | 6.8 |
| 2013 | 23.0°C | 16.2°C | 9.4°C | 33.9°C | 1.3°C | 25 mm | 53% | 2.3 m/s | 6.5 |
| 2012 | 21.3°C | 14.7°C | 8.0°C | 32.3°C | 1.8°C | 18 mm | 51% | 2.5 m/s | 6.5 |
| 2011 | 19.3°C | 13.0°C | 6.7°C | 25.6°C | 1.5°C | 51 mm | 60% | 2.5 m/s | 6 |
| 2010 | 19.3°C | 13.2°C | 7.0°C | 29.8°C | 1.9°C | 52 mm | 56% | 2.4 m/s | 5.9 |
| 2009 | 23.4°C | 15.9°C | 8.5°C | 34.9°C | 2.7°C | 23 mm | 51% | 2.5 m/s | 7.2 |
| 2008 | 23.1°C | 16.2°C | 9.3°C | 35.2°C | 0.6°C | 22 mm | 53% | 2.2 m/s | 6.1 |
| 2007 | 23.8°C | 16.3°C | 8.8°C | 32.6°C | 1.5°C | 14 mm | 49% | 2.4 m/s | 7 |
| 2006 | 23.4°C | 16.5°C | 9.6°C | 36.2°C | 1.4°C | 40 mm | 52% | 2.4 m/s | 6.6 |
| 2005 | 23.4°C | 17.0°C | 10.5°C | 34.3°C | 5.8°C | 43 mm | 54% | 2.2 m/s | 6.1 |
| 2004 | 21.6°C | 15.6°C | 9.7°C | 28.8°C | 5.4°C | 36 mm | 55% | 2.5 m/s | 5.9 |
| 2003 | 21.3°C | 15.0°C | 8.8°C | 32.9°C | 2.6°C | 21 mm | 54% | 2.2 m/s | 6.1 |
| 2002 | 21.3°C | 14.7°C | 8.2°C | 28.0°C | 1.7°C | 21 mm | 51% | 2.5 m/s | 6.2 |
| 2001 | 24.5°C | 16.6°C | 8.7°C | 36.9°C | 2.1°C | 13 mm | 46% | 2.4 m/s | 7.1 |
| 2000 | 21.6°C | 15.4°C | 9.1°C | 30.5°C | 2.5°C | 37 mm | 52% | 2.7 m/s | 6.4 |
| 1999 | 20.3°C | 13.4°C | 6.6°C | 33.5°C | -0.3°C | 19 mm | 52% | 2.6 m/s | 6.6 |
| 1998 | 21.4°C | 15.2°C | 9.0°C | 31.7°C | 5.5°C | 43 mm | 61% | 2.8 m/s | 5.6 |
| 1997 | 23.4°C | 16.9°C | 10.3°C | 30.9°C | 1.6°C | 29 mm | 59% | 2.1 m/s | 6.5 |
| 1996 | 18.8°C | 12.8°C | 6.7°C | 26.1°C | 0.8°C | 37 mm | 61% | 2.5 m/s | 6.3 |
| 1995 | 23.1°C | 16.2°C | 9.3°C | 32.7°C | 4.7°C | 18 mm | 53% | 2.3 m/s | 6.6 |
| 1994 | 23.6°C | 16.8°C | 10.1°C | 32.1°C | 4.2°C | 34 mm | 51% | 2.3 m/s | 5.9 |
| 1993 | 25.1°C | 18.1°C | 11.1°C | 34.0°C | 4.1°C | 43 mm | 57% | 2.7 m/s | 6.2 |
| 1992 | 26.3°C | 18.5°C | 10.6°C | 34.9°C | 2.8°C | 6 mm | 43% | 2.3 m/s | 7 |
| 1991 | 20.1°C | 13.7°C | 7.3°C | 24.2°C | 2.5°C | 60 mm | 58% | 2.6 m/s | 5.7 |
| 1990 | 20.7°C | 14.5°C | 8.3°C | 32.5°C | 2.3°C | 37 mm | 55% | 2.6 m/s | 5.9 |
| 1989 | 21.2°C | 14.8°C | 8.3°C | 28.5°C | 4.0°C | 38 mm | 55% | 2.4 m/s | 6.2 |
| 1988 | 22.3°C | 15.3°C | 8.2°C | 34.7°C | 1.2°C | 31 mm | 50% | 2.6 m/s | 5.8 |
| 1987 | 24.6°C | 17.5°C | 10.5°C | 35.0°C | 4.8°C | 24 mm | 49% | 2.4 m/s | 6.4 |
| 1986 | 22.3°C | 15.5°C | 8.7°C | 38.4°C | 2.7°C | 25 mm | 56% | 2.4 m/s | 6.2 |
| 1985 | 23.1°C | 16.0°C | 9.0°C | 33.6°C | 1.2°C | 15 mm | 52% | 2.5 m/s | 6.8 |
| 1984 ❄️ | 18.9°C | 12.8°C | 6.7°C | 31.4°C | 3.1°C | 28 mm | 59% | 2.9 m/s | 5.9 |
| 1983 | 23.4°C | 16.2°C | 9.1°C | 36.6°C | 3.6°C | 18 mm | 55% | 2.4 m/s | — |
| 1982 | 21.0°C | 14.1°C | 7.3°C | 29.7°C | 1.4°C | 13 mm | 53% | 2.3 m/s | — |
| 1981 | 20.9°C | 14.4°C | 8.0°C | 28.6°C | 2.8°C | 38 mm | 56% | 2.2 m/s | — |
Actual recorded May data for each year, 1981–2025 — sourced from NASA POWER.
The average high in May is around 22.5°C with lows near 9°C (mean 15.8°C), based on 45 years of NASA POWER data.
May averages 29 mm of rainfall in Pasco, about average for rainfall. The wettest on record was 63 mm in 2020.
The hottest May reached 38.4°C in 1986. The coldest dipped to -0.3°C in 1999.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average May temperatures have risen by about 1°C. Daytime highs moved from 21.5°C to 22.6°C and overnight lows from 8°C to 8.9°C over the same span.
May is one of the warmer months of the year in Pasco and about average for rainfall, so plan for around 22.5°C daytime highs and 9°C at night.
Not quite — May is the 8th coolest month in Pasco, averaging 15.8°C.
For May in Pasco, pack light layers you can adjust through the day, with typical highs of 22.5°C and lows of 9°C.
Relative humidity in May averages 54% — relatively dry.
Average wind speed in May is 2.4 m/s. The windiest May on record averaged 2.9 m/s (1984).
The wettest May on record was 2020 with 63 mm. On average, May sees 29 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 Pasco 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.
