May is one of the cooler months of the year in Roma, with average highs near 23.4°C and lows around 10.1°C (mean 16.8°C). It is one of the drier months, averaging 31 mm of rainfall and 63% relative humidity across the period.
May is one of the cooler months of the year in Roma. Across 45 years of records, the warmest May in Roma was 2007 — when the month averaged 19.6°C — while the coldest was 2011 at 13.9°C. Typical May days reach 23.4°C with nights near 10.1°C. The long-term May temperature trend is broadly flat.
May is one of the drier months in Roma, averaging 31 mm of rainfall. The wettest May on record was 1983 with 245 mm, while the driest were 2006, 2018 and 2019 at 1 mm.
Relative humidity in Roma during May averages 63%. The most humid May was 1983 at 84%, and the least humid was 2006 at 44%.
May receives about 4.1 kWh/m²/day of solar energy in Roma. The sunniest Mays were 2001, 2006 and 2023, among others at 4.5 kWh/m²/day, and the cloudiest was 2022 at 2.7.
Average wind speed in Roma during May is 2.3 m/s. The windiest Mays were 1981 and 2000 at 2.8 m/s, while the calmest were 1990, 2006 and 2009 at 2 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 16.8°C | 16.9°C | 16.9°C | 16.7°C | 16.7°C | -0.1°C |
| Avg High | 23.1°C | 23.3°C | 23.9°C | 23.5°C | 23.2°C | +0.1°C |
| Avg Low | 10.4°C | 10.5°C | 9.8°C | 9.9°C | 10.1°C | -0.3°C |
| Avg Rain | 59 mm | 39 mm | 17 mm | 19 mm | 21 mm | -39 mm |
May temperatures in Roma have risen by about 0.4°C between 1981–1985 and 2021–2025.
May has ranged from a record low of -0.2°C (1987) to a record high of 33.4°C (2007).
Rainfall in May is one of the drier months, averaging 31 mm, with a wettest year of 245 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0.1°C per decade while lows fell 0.1°C per decade, widening the gap between day and night.
A good time to visit Roma
May is a good time to visit Roma, with days averaging 23.4°C and nights around 10.1°C (mean 16.8°C, cooler than Roma's yearly average) and moderate rainfall. October and April 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 | 24.2°C | 18.0°C | 11.8°C | 30.9°C | 6.6°C | 11 mm | 65% | 2.4 m/s | 3.8 |
| 2024 | 23.5°C | 17.1°C | 10.6°C | 26.0°C | 3.8°C | 7 mm | 70% | 2.3 m/s | 4 |
| 2023 | 22.2°C | 14.7°C | 7.2°C | 26.7°C | 2.3°C | 20 mm | 57% | 2.2 m/s | 4.5 |
| 2022 | 22.6°C | 17.9°C | 13.2°C | 27.9°C | 8.0°C | 75 mm | 75% | 2.6 m/s | 2.7 |
| 2021 | 24.0°C | 16.7°C | 9.4°C | 28.9°C | 2.5°C | 3 mm | 58% | 2.3 m/s | 4.4 |
| 2020 | 22.4°C | 15.5°C | 8.6°C | 27.6°C | 3.2°C | 8 mm | 60% | 2.4 m/s | 4 |
| 2019 | 23.8°C | 16.9°C | 10.0°C | 28.1°C | 1.9°C | 1 mm | 61% | 2.4 m/s | 4.2 |
| 2018 | 24.2°C | 17.0°C | 9.9°C | 29.6°C | 4.2°C | 1 mm | 54% | 2.5 m/s | 4.4 |
| 2017 | 24.7°C | 17.9°C | 11.2°C | 28.9°C | 5.0°C | 14 mm | 64% | 2.2 m/s | 4.1 |
| 2016 | 26.4°C | 19.0°C | 11.5°C | 31.4°C | 4.5°C | 17 mm | 51% | 2.2 m/s | 4.1 |
| 2015 | 23.6°C | 16.7°C | 9.7°C | 29.8°C | 2.4°C | 14 mm | 64% | 2.5 m/s | 4.1 |
| 2014 | 23.9°C | 17.4°C | 11.0°C | 28.0°C | 4.2°C | 9 mm | 66% | 2.4 m/s | 4.1 |
| 2013 | 23.4°C | 16.8°C | 10.3°C | 30.2°C | 4.4°C | 43 mm | 63% | 2.4 m/s | 3.8 |
| 2012 | 22.5°C | 15.4°C | 8.4°C | 27.3°C | 2.9°C | 39 mm | 64% | 2.2 m/s | 4.1 |
| 2011 ❄️ | 20.2°C | 13.9°C | 7.5°C | 25.4°C | 1.7°C | 29 mm | 72% | 2.2 m/s | 4 |
| 2010 | 22.3°C | 15.7°C | 9.0°C | 26.9°C | 3.0°C | 21 mm | 67% | 2.2 m/s | 3.9 |
| 2009 | 23.3°C | 17.0°C | 10.6°C | 25.9°C | 5.6°C | 20 mm | 65% | 2 m/s | 3.8 |
| 2008 | 24.3°C | 16.9°C | 9.6°C | 28.1°C | 4.6°C | 6 mm | 49% | 2.2 m/s | 4.4 |
| 2007 🔥 | 26.6°C | 19.6°C | 12.7°C | 33.4°C | 4.8°C | 3 mm | 54% | 2.3 m/s | 4.2 |
| 2006 | 23.8°C | 16.0°C | 8.2°C | 28.5°C | 2.6°C | 1 mm | 44% | 2 m/s | 4.5 |
| 2005 | 23.4°C | 16.3°C | 9.3°C | 30.2°C | 2.9°C | 70 mm | 62% | 2.3 m/s | 4.2 |
| 2004 | 22.9°C | 15.9°C | 8.9°C | 27.5°C | 3.1°C | 5 mm | 61% | 2.1 m/s | 4.3 |
| 2003 | 23.8°C | 17.0°C | 10.2°C | 30.5°C | 5.8°C | 8 mm | 66% | 2.3 m/s | 4.3 |
| 2002 | 24.3°C | 17.2°C | 10.0°C | 30.0°C | 3.2°C | 9 mm | 50% | 2.3 m/s | 4.1 |
| 2001 | 23.6°C | 16.1°C | 8.6°C | 29.5°C | 3.6°C | 2 mm | 53% | 2.3 m/s | 4.5 |
| 2000 | 23.0°C | 16.5°C | 10.1°C | 29.5°C | 0.9°C | 44 mm | 66% | 2.8 m/s | 4 |
| 1999 | 24.4°C | 17.8°C | 11.1°C | 28.2°C | 6.9°C | 21 mm | 67% | 2.3 m/s | 4.1 |
| 1998 | 22.6°C | 16.3°C | 10.0°C | 27.8°C | 2.8°C | 42 mm | 71% | 2.1 m/s | 4 |
| 1997 | 22.8°C | 16.6°C | 10.4°C | 28.1°C | 4.5°C | 57 mm | 67% | 2.2 m/s | 3.6 |
| 1996 | 22.4°C | 16.2°C | 10.0°C | 27.3°C | 3.5°C | 42 mm | 74% | 2.2 m/s | 4.1 |
| 1995 | 23.2°C | 16.9°C | 10.5°C | 28.6°C | 2.7°C | 30 mm | 67% | 2.6 m/s | 3.8 |
| 1994 | 24.1°C | 16.3°C | 8.5°C | 29.2°C | 4.3°C | 3 mm | 50% | 2.1 m/s | 4.5 |
| 1993 | 25.3°C | 18.6°C | 11.9°C | 29.4°C | 5.7°C | 4 mm | 55% | 2.4 m/s | 4.2 |
| 1992 | 22.2°C | 16.2°C | 10.1°C | 27.2°C | 3.0°C | 64 mm | 69% | 2.1 m/s | 3.8 |
| 1991 | 24.5°C | 18.4°C | 12.3°C | 28.2°C | 7.1°C | 63 mm | 62% | 2.5 m/s | 4 |
| 1990 | 21.4°C | 15.6°C | 9.8°C | 24.6°C | 4.9°C | 61 mm | 79% | 2 m/s | 3.9 |
| 1989 | 22.8°C | 17.7°C | 12.6°C | 26.1°C | 5.2°C | 47 mm | 80% | 2.6 m/s | 3.6 |
| 1988 | 23.3°C | 16.7°C | 10.0°C | 28.3°C | 3.7°C | 18 mm | 70% | 2.4 m/s | 4 |
| 1987 | 22.8°C | 16.6°C | 10.3°C | 27.7°C | -0.2°C | 23 mm | 66% | 2.4 m/s | 3.8 |
| 1986 | 24.0°C | 17.5°C | 11.1°C | 28.8°C | 4.3°C | 42 mm | 67% | 2.2 m/s | 4 |
| 1985 | 24.2°C | 17.4°C | 10.7°C | 28.9°C | 4.3°C | 15 mm | 60% | 2.6 m/s | 4.1 |
| 1984 | 22.8°C | 15.9°C | 8.9°C | 27.0°C | 3.0°C | 19 mm | 66% | 2.1 m/s | 4.2 |
| 1983 🌧️ | 21.0°C | 15.9°C | 10.7°C | 23.7°C | 5.4°C | 245 mm | 84% | 2.7 m/s | — |
| 1982 | 23.9°C | 16.7°C | 9.5°C | 27.4°C | 2.5°C | 14 mm | 56% | 2.2 m/s | — |
| 1981 | 23.1°C | 16.5°C | 9.8°C | 29.0°C | 4.2°C | 113 mm | 62% | 2.8 m/s | — |
Actual recorded May data for each year, 1981–2025 — sourced from NASA POWER.
The average high in May is around 23.4°C with lows near 10.1°C (mean 16.8°C), based on 45 years of NASA POWER data.
May averages 31 mm of rainfall in Roma, one of the drier months. The wettest on record was 245 mm in 1983.
The hottest May reached 33.4°C in 2007. The coldest dipped to -0.2°C in 1987.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average May temperatures have risen by about 0.4°C. Daytime highs moved from 23°C to 23.3°C and overnight lows from 9.9°C to 10.4°C over the same span.
May is one of the cooler months of the year in Roma and one of the drier months, so plan for around 23.4°C daytime highs and 10.1°C at night.
Not quite — May is the 4th coolest month in Roma, averaging 16.8°C.
For May in Roma, pack light layers you can adjust through the day, with typical highs of 23.4°C and lows of 10.1°C.
Relative humidity in May averages 63% — moderately humid.
Average wind speed in May is 2.3 m/s. The windiest May on record averaged 2.8 m/s (1981).
The wettest May on record was 1983 with 245 mm. On average, May sees 31 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 Roma 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.
