May is one of the warmer months of the year in Rome, with average highs near 26.3°C and lows around 14.1°C (mean 20.2°C). It is about average for rainfall, averaging 108 mm of rainfall and 77% relative humidity across the period.
May is one of the warmer months of the year in Rome. Across 45 years of records, the warmest May in Rome was 2018 — when the month averaged 22.7°C — while the coldest were 1989 and 1997 at 17.5°C. Typical May days reach 26.3°C with nights near 14.1°C. The long-term trend is warming, about 0.3°C per decade.
May is about average for rainfall in Rome, averaging 108 mm of rainfall. The wettest May on record was 2003 with 283 mm, while the driest was 2007 at 20 mm.
Relative humidity in Rome during May averages 77%. The most humid May was 2009 at 85%, and the least humid was 2007 at 57%.
May receives about 5.9 kWh/m²/day of solar energy in Rome. The sunniest May was 2007 at 6.8 kWh/m²/day, and the cloudiest was 2003 at 4.8.
Average wind speed in Rome during May is 0.1 m/s. The windiest Mays were 2023, 2024 and 2025, among others at 0.1 m/s, while the calmest were 2023, 2024 and 2025, among others at 0.1 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 19.5°C | 19.7°C | 20.5°C | 21.0°C | 20.2°C | +0.7°C |
| Avg High | 26.0°C | 25.6°C | 26.8°C | 27.0°C | 26.0°C | 0°C |
| Avg Low | 13.1°C | 13.9°C | 14.2°C | 15.1°C | 14.4°C | +1.3°C |
| Avg Rain | 111 mm | 98 mm | 111 mm | 108 mm | 117 mm | +6 mm |
May temperatures in Rome have risen by about 1.3°C between 1981–1985 and 2021–2025.
May has ranged from a record low of 2.7°C (2011) to a record high of 36.5°C (2006).
Rainfall in May is about average for rainfall, averaging 108 mm, with a wettest year of 283 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0.2°C per decade while lows rose 0.5°C per decade, narrowing the gap between day and night.
One of the best times to visit Rome
May is one of the best times to visit Rome. Expect days averaging 26.3°C and nights around 14.1°C (mean 20.2°C) — warmer than Rome's yearly average — with higher rainfall (108 mm), so conditions are generally comfortable for sightseeing and outdoor plans.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 25.2°C | 20.2°C | 15.2°C | 30.0°C | 8.8°C | 202 mm | 84% | 0.1 m/s | 5 |
| 2024 | 27.5°C | 21.9°C | 16.3°C | 31.6°C | 10.5°C | 168 mm | 80% | 0.1 m/s | 5.8 |
| 2023 | 25.7°C | 19.8°C | 13.9°C | 30.9°C | 4.8°C | 57 mm | 80% | 0.1 m/s | 5.7 |
| 2022 | 28.1°C | 21.7°C | 15.2°C | 33.4°C | 9.0°C | 77 mm | 76% | 0.1 m/s | 6.2 |
| 2021 | 25.0°C | 19.0°C | 13.0°C | 31.7°C | 6.7°C | 114 mm | 77% | 0.1 m/s | 6 |
| 2020 | 24.3°C | 18.7°C | 13.0°C | 31.2°C | 2.9°C | 84 mm | 81% | 0.1 m/s | 6 |
| 2019 | 28.6°C | 22.6°C | 16.7°C | 33.5°C | 8.1°C | 75 mm | 78% | 0.1 m/s | 6.6 |
| 2018 🔥 | 28.4°C | 22.7°C | 17.1°C | 31.6°C | 7.6°C | 136 mm | 80% | 0.1 m/s | 6 |
| 2017 | 26.6°C | 20.5°C | 14.3°C | 32.9°C | 5.8°C | 185 mm | 77% | 0.1 m/s | 6.1 |
| 2016 | 26.0°C | 19.8°C | 13.6°C | 33.1°C | 5.7°C | 65 mm | 77% | 0.1 m/s | 6.4 |
| 2015 | 27.4°C | 21.3°C | 15.2°C | 31.8°C | 7.0°C | 84 mm | 76% | 0.1 m/s | 6.3 |
| 2014 | 26.2°C | 20.3°C | 14.4°C | 31.2°C | 6.1°C | 93 mm | 80% | 0.1 m/s | 6.2 |
| 2013 | 24.5°C | 18.9°C | 13.3°C | 29.0°C | 4.4°C | 164 mm | 80% | 0.1 m/s | 5.8 |
| 2012 | 28.6°C | 22.4°C | 16.2°C | 34.7°C | 8.8°C | 98 mm | 75% | 0.1 m/s | 6.2 |
| 2011 | 26.4°C | 20.0°C | 13.6°C | 34.0°C | 2.7°C | 46 mm | 76% | 0.1 m/s | 6.1 |
| 2010 | 27.3°C | 21.8°C | 16.2°C | 33.1°C | 8.1°C | 139 mm | 80% | 0.1 m/s | 5.9 |
| 2009 | 24.7°C | 19.9°C | 15.2°C | 29.8°C | 5.3°C | 197 mm | 85% | 0.1 m/s | 5 |
| 2008 | 26.2°C | 19.8°C | 13.3°C | 32.1°C | 7.4°C | 96 mm | 76% | 0.1 m/s | 6 |
| 2007 | 30.1°C | 22.2°C | 14.2°C | 33.6°C | 6.9°C | 20 mm | 57% | 0.1 m/s | 6.8 |
| 2006 | 26.7°C | 20.3°C | 14.0°C | 36.5°C | 7.0°C | 76 mm | 75% | 0.1 m/s | 5.9 |
| 2005 | 24.8°C | 18.4°C | 11.9°C | 31.9°C | 5.1°C | 56 mm | 77% | 0.1 m/s | 6.3 |
| 2004 | 28.8°C | 22.4°C | 16.0°C | 34.0°C | 3.6°C | 92 mm | 73% | 0.1 m/s | 5.7 |
| 2003 🌧️ | 25.2°C | 20.4°C | 15.6°C | 29.5°C | 9.3°C | 283 mm | 85% | 0.1 m/s | 4.8 |
| 2002 | 26.3°C | 19.6°C | 12.8°C | 31.8°C | 3.8°C | 128 mm | 75% | 0.1 m/s | 5.8 |
| 2001 | 26.0°C | 19.9°C | 13.7°C | 30.9°C | 7.9°C | 111 mm | 77% | 0.1 m/s | 6.2 |
| 2000 | 29.0°C | 22.1°C | 15.1°C | 34.0°C | 8.1°C | 50 mm | 70% | 0.1 m/s | 6 |
| 1999 | 26.0°C | 19.4°C | 12.9°C | 28.6°C | 4.6°C | 106 mm | 77% | 0.1 m/s | 6.4 |
| 1998 | 28.0°C | 22.1°C | 16.2°C | 33.0°C | 6.9°C | 77 mm | 78% | 0.1 m/s | 6.3 |
| 1997 | 23.4°C | 17.5°C | 11.5°C | 28.8°C | 5.1°C | 150 mm | 79% | 0.1 m/s | 6 |
| 1996 | 27.2°C | 21.3°C | 15.4°C | 35.1°C | 4.1°C | 68 mm | 80% | 0.1 m/s | 6.4 |
| 1995 | 26.4°C | 20.4°C | 14.5°C | 31.6°C | 5.8°C | 83 mm | 77% | 0.1 m/s | 5.8 |
| 1994 | 24.2°C | 18.1°C | 12.0°C | 29.6°C | 7.5°C | 80 mm | 78% | 0.1 m/s | 6.5 |
| 1993 | 24.8°C | 19.3°C | 13.8°C | 31.0°C | 6.4°C | 108 mm | 80% | 0.1 m/s | 5.9 |
| 1992 | 24.3°C | 18.4°C | 12.5°C | 34.1°C | 5.8°C | 42 mm | 78% | 0.1 m/s | 5.6 |
| 1991 | 27.0°C | 22.0°C | 17.0°C | 32.8°C | 7.3°C | 139 mm | 83% | 0.1 m/s | 4.9 |
| 1990 | 24.7°C | 18.9°C | 13.0°C | 28.5°C | 5.9°C | 126 mm | 79% | 0.1 m/s | 5.5 |
| 1989 ❄️ | 23.4°C | 17.5°C | 11.6°C | 32.0°C | 3.7°C | 114 mm | 80% | 0.1 m/s | 5.5 |
| 1988 | 27.0°C | 19.4°C | 11.8°C | 34.8°C | 5.5°C | 48 mm | 65% | 0.1 m/s | 6.5 |
| 1987 | 27.1°C | 21.6°C | 16.2°C | 31.2°C | 10.0°C | 74 mm | 81% | 0.1 m/s | 5.9 |
| 1986 | 28.4°C | 21.3°C | 14.2°C | 32.8°C | 3.4°C | 90 mm | 66% | 0.1 m/s | 5.5 |
| 1985 | 26.3°C | 19.8°C | 13.4°C | 32.9°C | 7.6°C | 115 mm | 75% | 0.1 m/s | 5.6 |
| 1984 | 24.6°C | 18.4°C | 12.2°C | 29.6°C | 5.1°C | 181 mm | 81% | 0.1 m/s | 5.5 |
| 1983 | 24.0°C | 18.1°C | 12.3°C | 27.0°C | 6.7°C | 171 mm | 81% | 0.1 m/s | — |
| 1982 | 27.0°C | 21.0°C | 14.9°C | 30.6°C | 6.0°C | 81 mm | 78% | 0.1 m/s | — |
| 1981 | 26.1°C | 18.8°C | 11.5°C | 32.2°C | 5.6°C | 126 mm | 69% | 0.1 m/s | — |
Actual recorded May data for each year, 1981–2025 — sourced from NASA POWER.
The average high in May is around 26.3°C with lows near 14.1°C (mean 20.2°C), based on 45 years of NASA POWER data.
May averages 108 mm of rainfall in Rome, about average for rainfall. The wettest on record was 283 mm in 2003.
The hottest May reached 36.5°C in 2006. The coldest dipped to 2.7°C in 2011.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average May temperatures have risen by about 1.3°C. Daytime highs moved from 25.6°C to 26.3°C and overnight lows from 12.9°C to 14.7°C over the same span.
May is one of the warmer months of the year in Rome and about average for rainfall, so plan for around 26.3°C daytime highs and 14.1°C at night.
Not quite — May is the 8th coolest month in Rome, averaging 20.2°C.
For May in Rome, pack light layers you can adjust through the day, with typical highs of 26.3°C and lows of 14.1°C. Bring an umbrella or light rain jacket too.
Relative humidity in May averages 77% — quite humid.
Average wind speed in May is 0.1 m/s. The windiest May on record averaged 0.1 m/s (1981).
The wettest May on record was 2003 with 283 mm. On average, May sees 108 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 Rome 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.
