May is one of the warmer months of the year in Saint-Lazare, with average highs near 17.9°C and lows around 6.6°C (mean 12.3°C). It is about average for rainfall, averaging 84 mm of rainfall and 79% relative humidity across the period.
May is one of the warmer months of the year in Saint-Lazare. Across 45 years of records, the warmest May in Saint-Lazare was 1998 — when the month averaged 15.2°C — while the coldest was 1997 at 9.1°C. Typical May days reach 17.9°C with nights near 6.6°C. The long-term trend is warming, about 0.3°C per decade.
May is about average for rainfall in Saint-Lazare, averaging 84 mm of rainfall. The wettest May on record was 2017 with 160 mm, while the driest was 2021 at 21 mm.
Relative humidity in Saint-Lazare during May averages 79%. The most humid May was 2011 at 86%, and the least humid was 2021 at 72%.
May receives about 5.3 kWh/m²/day of solar energy in Saint-Lazare. The sunniest May was 2023 at 6.3 kWh/m²/day, and the cloudiest was 1984 at 4.1.
Average wind speed in Saint-Lazare during May is 1 m/s. The windiest May was 1997 at 1.3 m/s, while the calmest was 1982 at 0.8 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 12.0°C | 12.0°C | 11.7°C | 13.0°C | 12.9°C | +0.9°C |
| Avg High | 17.6°C | 17.7°C | 17.2°C | 18.7°C | 18.7°C | +1.1°C |
| Avg Low | 6.4°C | 6.3°C | 6.1°C | 7.4°C | 7.1°C | +0.7°C |
| Avg Rain | 89 mm | 73 mm | 101 mm | 89 mm | 54 mm | -35 mm |
May temperatures in Saint-Lazare have risen by about 1.9°C between 1981–1985 and 2021–2025.
May has ranged from a record low of -4.3°C (1995) to a record high of 31.1°C (2012).
Rainfall in May is about average for rainfall, averaging 84 mm, with a wettest year of 160 mm.
A good time to visit Saint-Lazare
May is a good time to visit Saint-Lazare, with days averaging 17.9°C and nights around 6.6°C (mean 12.3°C, warmer than Saint-Lazare's yearly average) and higher 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 | 18.2°C | 12.8°C | 7.4°C | 25.6°C | -0.5°C | 72 mm | 80% | 1 m/s | 4.6 |
| 2024 | 20.1°C | 15.0°C | 9.9°C | 28.8°C | 4.3°C | 60 mm | 79% | 0.9 m/s | 5.2 |
| 2023 | 18.0°C | 11.7°C | 5.4°C | 28.2°C | -2.7°C | 52 mm | 75% | 1.1 m/s | 6.3 |
| 2022 | 20.3°C | 14.2°C | 8.1°C | 28.4°C | 0.4°C | 84 mm | 77% | 0.9 m/s | 5.8 |
| 2021 | 18.8°C | 12.8°C | 6.7°C | 29.3°C | -1.7°C | 21 mm | 72% | 1 m/s | 5.8 |
| 2020 | 16.8°C | 10.9°C | 4.9°C | 30.5°C | -3.6°C | 34 mm | 76% | 1.1 m/s | 6 |
| 2019 | 15.6°C | 10.4°C | 5.2°C | 21.9°C | -1.0°C | 95 mm | 81% | 1 m/s | 4.6 |
| 2018 | 19.9°C | 13.4°C | 6.8°C | 27.6°C | 0.6°C | 56 mm | 79% | 1 m/s | 5.9 |
| 2017 🌧️ | 16.3°C | 11.5°C | 6.8°C | 27.2°C | -2.2°C | 160 mm | 84% | 1.1 m/s | 4.6 |
| 2016 | 18.1°C | 12.3°C | 6.5°C | 28.4°C | -1.7°C | 49 mm | 79% | 1 m/s | 5.8 |
| 2015 | 20.8°C | 14.5°C | 8.1°C | 27.4°C | -1.3°C | 74 mm | 76% | 1.1 m/s | 5.7 |
| 2014 | 18.0°C | 12.6°C | 7.2°C | 26.9°C | -1.1°C | 103 mm | 81% | 1 m/s | 5.5 |
| 2013 | 19.7°C | 13.9°C | 8.1°C | 27.6°C | 0.9°C | 98 mm | 76% | 1 m/s | 5.5 |
| 2012 | 20.5°C | 14.7°C | 8.9°C | 31.1°C | 1.9°C | 80 mm | 78% | 0.9 m/s | 5.6 |
| 2011 | 17.6°C | 12.8°C | 8.0°C | 27.4°C | 1.3°C | 134 mm | 86% | 1 m/s | 4.5 |
| 2010 | 20.1°C | 14.1°C | 8.1°C | 30.6°C | -2.1°C | 45 mm | 77% | 1 m/s | 5.8 |
| 2009 | 16.7°C | 11.2°C | 5.8°C | 24.8°C | 0.3°C | 95 mm | 78% | 1.1 m/s | 5.2 |
| 2008 | 16.5°C | 10.9°C | 5.3°C | 22.9°C | 0.4°C | 79 mm | 78% | 1.1 m/s | 5.8 |
| 2007 | 18.3°C | 12.0°C | 5.6°C | 27.4°C | -1.0°C | 69 mm | 77% | 1 m/s | 6 |
| 2006 | 17.7°C | 13.1°C | 8.4°C | 28.1°C | -2.0°C | 145 mm | 84% | 1.1 m/s | 4.9 |
| 2005 | 15.5°C | 10.2°C | 4.9°C | 25.6°C | -3.1°C | 44 mm | 80% | 1 m/s | 5.2 |
| 2004 | 17.9°C | 12.2°C | 6.5°C | 25.8°C | -3.0°C | 109 mm | 81% | 1 m/s | 5.2 |
| 2003 | 17.5°C | 12.0°C | 6.4°C | 25.9°C | -2.1°C | 126 mm | 79% | 0.9 m/s | 5 |
| 2002 | 15.3°C | 9.8°C | 4.3°C | 25.6°C | -0.8°C | 125 mm | 78% | 1.2 m/s | 4.9 |
| 2001 | 19.3°C | 13.6°C | 8.0°C | 25.9°C | 1.3°C | 84 mm | 80% | 1 m/s | 5.2 |
| 2000 | 17.2°C | 11.7°C | 6.2°C | 24.9°C | -1.2°C | 138 mm | 82% | 1.1 m/s | 4.7 |
| 1999 | 20.9°C | 14.5°C | 8.1°C | 28.8°C | -0.5°C | 52 mm | 75% | 0.9 m/s | 6 |
| 1998 🔥 | 21.1°C | 15.2°C | 9.4°C | 27.0°C | 3.4°C | 84 mm | 78% | 1 m/s | 5.8 |
| 1997 ❄️ | 14.3°C | 9.1°C | 4.0°C | 21.7°C | -2.2°C | 71 mm | 79% | 1.3 m/s | 4.9 |
| 1996 | 16.3°C | 10.4°C | 4.6°C | 25.1°C | -0.9°C | 72 mm | 77% | 1 m/s | 5.8 |
| 1995 | 17.8°C | 11.9°C | 6.0°C | 24.1°C | -4.3°C | 63 mm | 75% | 1 m/s | 5 |
| 1994 | 16.7°C | 10.9°C | 5.1°C | 26.0°C | -1.9°C | 98 mm | 80% | 1.1 m/s | 5.3 |
| 1993 | 17.5°C | 12.1°C | 6.8°C | 25.5°C | 2.5°C | 61 mm | 80% | 1 m/s | 5 |
| 1992 | 17.8°C | 11.5°C | 5.2°C | 26.3°C | -1.0°C | 67 mm | 77% | 1 m/s | 6.1 |
| 1991 | 19.3°C | 13.9°C | 8.5°C | 26.1°C | 0.8°C | 88 mm | 80% | 1.1 m/s | 5.4 |
| 1990 | 15.6°C | 10.3°C | 5.0°C | 23.0°C | -1.2°C | 75 mm | 80% | 1.1 m/s | 5 |
| 1989 | 17.8°C | 12.7°C | 7.6°C | 27.6°C | 1.1°C | 99 mm | 82% | 1 m/s | 4.5 |
| 1988 | 19.0°C | 13.1°C | 7.2°C | 25.2°C | 0.6°C | 49 mm | 79% | 0.9 m/s | 5.4 |
| 1987 | 17.7°C | 11.8°C | 6.0°C | 28.1°C | -2.5°C | 67 mm | 78% | 1.1 m/s | 5.2 |
| 1986 | 18.5°C | 13.0°C | 7.6°C | 26.1°C | -3.3°C | 117 mm | 81% | 1.1 m/s | 5 |
| 1985 | 17.4°C | 11.6°C | 5.8°C | 24.9°C | -1.7°C | 63 mm | 77% | 1.1 m/s | 5.6 |
| 1984 | 15.0°C | 10.2°C | 5.4°C | 24.6°C | -0.5°C | 111 mm | 81% | 1.2 m/s | 4.1 |
| 1983 | 15.4°C | 10.0°C | 4.7°C | 21.8°C | -2.6°C | 138 mm | 83% | 1 m/s | — |
| 1982 | 19.4°C | 13.4°C | 7.4°C | 25.9°C | 2.0°C | 43 mm | 80% | 0.8 m/s | — |
| 1981 | 17.8°C | 12.0°C | 6.2°C | 24.7°C | -2.3°C | 112 mm | 79% | 1 m/s | — |
Actual recorded May data for each year, 1981–2025 — sourced from NASA POWER.
The average high in May is around 17.9°C with lows near 6.6°C (mean 12.3°C), based on 45 years of NASA POWER data.
May averages 84 mm of rainfall in Saint-Lazare, about average for rainfall. The wettest on record was 160 mm in 2017.
The hottest May reached 31.1°C in 2012. The coldest dipped to -4.3°C in 1995.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average May temperatures have risen by about 1.9°C. Daytime highs moved from 17°C to 19.1°C and overnight lows from 5.9°C to 7.5°C over the same span.
May is one of the warmer months of the year in Saint-Lazare and about average for rainfall, so plan for around 17.9°C daytime highs and 6.6°C at night.
Not quite — May is the 8th coolest month in Saint-Lazare, averaging 12.3°C.
For May in Saint-Lazare, pack warm layers and a jacket for chilly mornings, with typical highs of 17.9°C and lows of 6.6°C. Bring an umbrella or light rain jacket too.
Relative humidity in May averages 79% — quite humid.
Average wind speed in May is 1 m/s. The windiest May on record averaged 1.3 m/s (1997).
The wettest May on record was 2017 with 160 mm. On average, May sees 84 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 Saint-Lazare 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.
