May is one of the warmer months of the year in ‘Unayzah, with average highs near 38.8°C and lows around 22.2°C (mean 30.5°C). It is about average for rainfall, averaging 1 mm of rainfall and 19% relative humidity across the period.
May is one of the warmer months of the year in ‘Unayzah. Across 45 years of records, the warmest Mays in ‘Unayzah were 2017 and 2021 — when the month averaged 32°C — while the coldest was 1993 at 28.7°C. Typical May days reach 38.8°C with nights near 22.2°C. The long-term trend is warming, about 0.2°C per decade.
May is about average for rainfall in ‘Unayzah, averaging 1 mm of rainfall. The wettest May on record was 2024 with 12 mm, while the driest were 2020, 2021 and 2022, among others at 0 mm.
Relative humidity in ‘Unayzah during May averages 19%. The most humid May was 1983 at 31%, and the least humid was 2002 at 13%.
May receives about 7.3 kWh/m²/day of solar energy in ‘Unayzah. The sunniest May was 2004 at 8.1 kWh/m²/day, and the cloudiest was 1987 at 5.9.
Average wind speed in ‘Unayzah during May is 2.9 m/s. The windiest May was 1983 at 3.6 m/s, while the calmest were 1996, 1998 and 2019 at 2.5 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 30.2°C | 30.0°C | 30.6°C | 31.0°C | 30.5°C | +0.3°C |
| Avg High | 38.5°C | 38.2°C | 39.1°C | 39.1°C | 39.0°C | +0.5°C |
| Avg Low | 21.9°C | 21.8°C | 22.0°C | 22.9°C | 22.1°C | +0.2°C |
| Avg Rain | 2 mm | 1 mm | 1 mm | 0 mm | 3 mm | +1 mm |
May temperatures in ‘Unayzah have risen by about 0.6°C between 1981–1985 and 2021–2025.
May has ranged from a record low of 12.5°C (1981) to a record high of 45°C (2025).
Rainfall in May is about average for rainfall, averaging 1 mm, with a wettest year of 12 mm.
A good time to visit ‘Unayzah
May is a good time to visit ‘Unayzah, with days averaging 38.8°C and nights around 22.2°C (mean 30.5°C, warmer than ‘Unayzah's yearly average) and low rainfall. November and March 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 | 39.9°C | 31.1°C | 22.3°C | 45.0°C | 16.7°C | 3 mm | 18% | 3.1 m/s | 7.8 |
| 2024 🌧️ | 38.3°C | 29.8°C | 21.4°C | 44.7°C | 15.4°C | 12 mm | 24% | 2.9 m/s | 7.7 |
| 2023 | 38.0°C | 29.8°C | 21.6°C | 43.2°C | 14.5°C | 1 mm | 24% | 3 m/s | 7.4 |
| 2022 | 38.8°C | 29.7°C | 20.7°C | 43.7°C | 15.8°C | 0 mm | 16% | 3 m/s | 7.4 |
| 2021 | 40.3°C | 32.0°C | 23.6°C | 43.9°C | 18.7°C | 0 mm | 13% | 2.7 m/s | 7.6 |
| 2020 | 38.4°C | 30.7°C | 22.9°C | 43.3°C | 17.5°C | 0 mm | 18% | 3 m/s | 7.3 |
| 2019 | 39.2°C | 31.2°C | 23.2°C | 42.9°C | 17.9°C | 0 mm | 18% | 2.5 m/s | 7.6 |
| 2018 | 38.7°C | 30.6°C | 22.6°C | 41.9°C | 17.1°C | 0 mm | 19% | 3.1 m/s | 7.4 |
| 2017 🔥 | 39.9°C | 32.0°C | 24.1°C | 42.9°C | 19.2°C | 1 mm | 19% | 2.9 m/s | 7.1 |
| 2016 | 39.4°C | 30.9°C | 22.4°C | 42.9°C | 18.2°C | 0 mm | 17% | 2.9 m/s | 7.9 |
| 2015 | 39.6°C | 31.7°C | 23.9°C | 43.8°C | 19.0°C | 0 mm | 17% | 2.9 m/s | 7.2 |
| 2014 | 38.2°C | 30.3°C | 22.5°C | 43.8°C | 17.7°C | 0 mm | 18% | 2.9 m/s | 7.2 |
| 2013 | 37.5°C | 29.0°C | 20.4°C | 43.1°C | 14.5°C | 0 mm | 21% | 2.9 m/s | 7.7 |
| 2012 | 40.3°C | 31.9°C | 23.5°C | 43.0°C | 18.7°C | 0 mm | 14% | 3.2 m/s | 7.3 |
| 2011 | 39.0°C | 30.9°C | 22.9°C | 42.9°C | 14.9°C | 0 mm | 19% | 2.9 m/s | 7.5 |
| 2010 | 39.3°C | 31.2°C | 23.1°C | 43.6°C | 19.7°C | 0 mm | 21% | 3 m/s | 7.4 |
| 2009 | 38.8°C | 30.6°C | 22.3°C | 43.0°C | 16.1°C | 1 mm | 23% | 3.2 m/s | 7 |
| 2008 | 39.2°C | 30.9°C | 22.6°C | 43.6°C | 18.2°C | 1 mm | 16% | 3.1 m/s | 7.5 |
| 2007 | 39.7°C | 31.6°C | 23.6°C | 43.1°C | 19.3°C | 1 mm | 15% | 3 m/s | 7.5 |
| 2006 | 39.0°C | 31.1°C | 23.2°C | 43.2°C | 18.4°C | 0 mm | 20% | 2.9 m/s | 7.2 |
| 2005 | 37.8°C | 29.4°C | 20.9°C | 41.3°C | 13.2°C | 0 mm | 16% | 2.7 m/s | 7.6 |
| 2004 | 39.0°C | 29.8°C | 20.6°C | 43.0°C | 15.5°C | 0 mm | 14% | 2.7 m/s | 8.1 |
| 2003 | 39.3°C | 30.7°C | 22.1°C | 42.6°C | 17.0°C | 3 mm | 16% | 3 m/s | 7.3 |
| 2002 | 39.9°C | 30.6°C | 21.2°C | 44.4°C | 15.0°C | 0 mm | 13% | 2.9 m/s | 8 |
| 2001 | 39.0°C | 30.3°C | 21.5°C | 43.9°C | 17.1°C | 0 mm | 13% | 3 m/s | 7.9 |
| 2000 | 39.2°C | 30.6°C | 22.0°C | 43.1°C | 18.4°C | 8 mm | 16% | 2.8 m/s | 7.2 |
| 1999 | 39.7°C | 31.2°C | 22.8°C | 43.9°C | 19.3°C | 0 mm | 14% | 2.9 m/s | 7.7 |
| 1998 | 38.6°C | 30.0°C | 21.4°C | 44.9°C | 15.4°C | 0 mm | 19% | 2.5 m/s | 8 |
| 1997 | 36.5°C | 29.0°C | 21.6°C | 41.5°C | 17.4°C | 1 mm | 20% | 2.6 m/s | 7.4 |
| 1996 | 39.3°C | 31.3°C | 23.2°C | 43.0°C | 18.1°C | 1 mm | 17% | 2.5 m/s | 7.3 |
| 1995 | 37.8°C | 30.1°C | 22.3°C | 41.7°C | 15.2°C | 3 mm | 20% | 2.8 m/s | 6.7 |
| 1994 | 37.8°C | 30.4°C | 23.1°C | 43.7°C | 17.2°C | 0 mm | 22% | 3.1 m/s | 6.8 |
| 1993 ❄️ | 36.8°C | 28.7°C | 20.6°C | 42.1°C | 14.5°C | 5 mm | 23% | 2.9 m/s | 6.8 |
| 1992 | 37.3°C | 29.0°C | 20.7°C | 42.3°C | 16.6°C | 0 mm | 18% | 3.1 m/s | 7.4 |
| 1991 | 38.1°C | 29.4°C | 20.8°C | 44.3°C | 15.4°C | 0 mm | 15% | 2.9 m/s | 6.9 |
| 1990 | 40.1°C | 31.0°C | 21.8°C | 43.7°C | 15.9°C | 0 mm | 13% | 2.7 m/s | 8 |
| 1989 | 38.8°C | 30.8°C | 22.8°C | 42.5°C | 19.5°C | 0 mm | 17% | 2.8 m/s | 7.2 |
| 1988 | 39.5°C | 30.8°C | 22.1°C | 43.7°C | 19.6°C | 0 mm | 14% | 3 m/s | 6.6 |
| 1987 | 39.1°C | 31.6°C | 24.1°C | 42.1°C | 20.1°C | 0 mm | 24% | 3.1 m/s | 5.9 |
| 1986 | 38.1°C | 29.3°C | 20.5°C | 43.9°C | 13.4°C | 6 mm | 19% | 3.3 m/s | 6.9 |
| 1985 | 38.0°C | 29.9°C | 21.7°C | 42.3°C | 18.5°C | 1 mm | 24% | 2.7 m/s | 7.3 |
| 1984 | 38.2°C | 29.5°C | 20.9°C | 42.9°C | 16.5°C | 0 mm | 17% | 3.1 m/s | 6.5 |
| 1983 | 37.9°C | 30.0°C | 22.1°C | 42.1°C | 16.6°C | 7 mm | 31% | 3.6 m/s | — |
| 1982 | 38.2°C | 30.6°C | 23.0°C | 42.7°C | 16.4°C | 0 mm | 26% | 3.3 m/s | — |
| 1981 | 38.4°C | 29.3°C | 20.3°C | 42.6°C | 12.5°C | 6 mm | 23% | 3.1 m/s | — |
Actual recorded May data for each year, 1981–2025 — sourced from NASA POWER.
The average high in May is around 38.8°C with lows near 22.2°C (mean 30.5°C), based on 45 years of NASA POWER data.
May averages 1 mm of rainfall in ‘Unayzah, about average for rainfall. The wettest on record was 12 mm in 2024.
The hottest May reached 45°C in 2025. The coldest dipped to 12.5°C in 1981.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average May temperatures have risen by about 0.6°C. Daytime highs moved from 38.1°C to 39.1°C and overnight lows from 21.6°C to 21.9°C over the same span.
May is one of the warmer months of the year in ‘Unayzah and about average for rainfall, so plan for around 38.8°C daytime highs and 22.2°C at night.
Not quite — May is the 8th coolest month in ‘Unayzah, averaging 30.5°C.
For May in ‘Unayzah, pack light, breathable clothing and sun protection, with typical highs of 38.8°C and lows of 22.2°C.
Relative humidity in May averages 19% — relatively dry.
Average wind speed in May is 2.9 m/s. The windiest May on record averaged 3.6 m/s (1983).
The wettest May on record was 2024 with 12 mm. On average, May sees 1 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 ‘Unayzah 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.
