August is one of the warmer months of the year in Saint-Lazare, with average highs near 25.2°C and lows around 14.4°C (mean 19.8°C). It is about average for rainfall, averaging 92 mm of rainfall and 75% relative humidity across the period.
August is one of the warmer months of the year in Saint-Lazare. Across 45 years of records, the warmest August in Saint-Lazare was 2021 — when the month averaged 23.7°C — while the coldest was 1982 at 16.8°C. Typical August days reach 25.2°C with nights near 14.4°C. The long-term trend is warming, about 0.5°C per decade.
August is about average for rainfall in Saint-Lazare, averaging 92 mm of rainfall. The wettest August on record was 2024 with 156 mm, while the driest was 2002 at 37 mm.
Relative humidity in Saint-Lazare during August averages 75%. The most humid August was 2000 at 82%, and the least humid was 2025 at 62%.
August receives about 5.1 kWh/m²/day of solar energy in Saint-Lazare. The sunniest Augusts were 1996 and 2002 at 5.6 kWh/m²/day, and the cloudiest was 1988 at 4.3.
Average wind speed in Saint-Lazare during August is 0.8 m/s. The windiest Augusts were 2016, 2019 and 2020, among others at 0.9 m/s, while the calmest were 2023, 2024 and 2025, among others at 0.8 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 18.6°C | 19.5°C | 19.8°C | 20.3°C | 21.1°C | +2.5°C |
| Avg High | 24.1°C | 25.1°C | 25.1°C | 25.6°C | 26.6°C | +2.5°C |
| Avg Low | 13.2°C | 14.0°C | 14.5°C | 15.0°C | 15.5°C | +2.3°C |
| Avg Rain | 110 mm | 80 mm | 90 mm | 91 mm | 90 mm | -20 mm |
August temperatures in Saint-Lazare have risen by about 2.4°C between 1981–1985 and 2021–2025.
August has ranged from a record low of 3.2°C (1982) to a record high of 36.2°C (2025).
Rainfall in August is about average for rainfall, averaging 92 mm, with a wettest year of 156 mm.
One of the best times to visit Saint-Lazare
August is one of the best times to visit Saint-Lazare. Expect days averaging 25.2°C and nights around 14.4°C (mean 19.8°C) — warmer than Saint-Lazare's yearly average — with higher rainfall (92 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 | 27.5°C | 21.2°C | 14.8°C | 36.2°C | 8.9°C | 61 mm | 62% | 0.8 m/s | 5.3 |
| 2024 🌧️ | 25.4°C | 20.2°C | 15.1°C | 32.1°C | 9.1°C | 156 mm | 78% | 0.8 m/s | 4.5 |
| 2023 | 24.6°C | 19.3°C | 13.9°C | 28.1°C | 8.2°C | 97 mm | 76% | 0.8 m/s | 4.8 |
| 2022 | 27.1°C | 21.5°C | 15.8°C | 33.6°C | 10.1°C | 81 mm | 72% | 0.8 m/s | 5 |
| 2021 🔥 | 29.2°C | 23.7°C | 18.2°C | 34.3°C | 12.2°C | 41 mm | 68% | 0.8 m/s | 5 |
| 2020 | 26.0°C | 20.7°C | 15.4°C | 31.5°C | 9.0°C | 105 mm | 72% | 0.9 m/s | 5.2 |
| 2019 | 25.7°C | 20.0°C | 14.3°C | 29.5°C | 10.6°C | 69 mm | 73% | 0.9 m/s | 5.4 |
| 2018 | 27.7°C | 22.3°C | 16.9°C | 31.5°C | 10.9°C | 59 mm | 74% | 0.8 m/s | 4.9 |
| 2017 | 23.3°C | 18.6°C | 13.9°C | 27.0°C | 7.8°C | 84 mm | 81% | 0.8 m/s | 5.3 |
| 2016 | 27.3°C | 21.9°C | 16.5°C | 33.1°C | 11.0°C | 122 mm | 73% | 0.9 m/s | 5.2 |
| 2015 | 26.0°C | 20.7°C | 15.3°C | 31.5°C | 10.8°C | 83 mm | 74% | 0.8 m/s | 4.9 |
| 2014 | 23.9°C | 19.0°C | 14.2°C | 29.1°C | 9.0°C | 87 mm | 79% | 0.8 m/s | 5.1 |
| 2013 | 24.5°C | 19.2°C | 13.8°C | 29.2°C | 7.7°C | 91 mm | 77% | 0.9 m/s | 5.1 |
| 2012 | 27.2°C | 21.5°C | 15.8°C | 33.9°C | 9.5°C | 72 mm | 69% | 0.9 m/s | 5 |
| 2011 | 24.7°C | 19.8°C | 14.9°C | 28.5°C | 9.9°C | 135 mm | 79% | 0.8 m/s | 5 |
| 2010 | 25.5°C | 20.1°C | 14.6°C | 32.6°C | 8.4°C | 112 mm | 76% | 0.9 m/s | 5.1 |
| 2009 | 24.5°C | 19.7°C | 15.0°C | 30.2°C | 7.0°C | 84 mm | 80% | 0.9 m/s | 5 |
| 2008 | 23.6°C | 18.7°C | 13.7°C | 27.9°C | 8.3°C | 87 mm | 81% | 0.8 m/s | 5.1 |
| 2007 | 25.2°C | 19.3°C | 13.5°C | 30.9°C | 7.3°C | 84 mm | 75% | 0.9 m/s | 5.4 |
| 2006 | 23.5°C | 18.5°C | 13.4°C | 31.3°C | 7.6°C | 107 mm | 78% | 0.8 m/s | 5.5 |
| 2005 | 26.9°C | 21.3°C | 15.8°C | 31.0°C | 9.1°C | 107 mm | 71% | 0.8 m/s | 5.1 |
| 2004 | 23.1°C | 18.2°C | 13.3°C | 27.8°C | 6.5°C | 105 mm | 82% | 0.8 m/s | 4.7 |
| 2003 | 25.6°C | 20.8°C | 16.0°C | 29.2°C | 8.5°C | 100 mm | 78% | 0.8 m/s | 4.9 |
| 2002 | 26.7°C | 20.9°C | 15.1°C | 32.8°C | 10.2°C | 37 mm | 73% | 0.9 m/s | 5.6 |
| 2001 | 28.0°C | 22.0°C | 16.0°C | 33.9°C | 9.7°C | 81 mm | 68% | 0.9 m/s | 5.2 |
| 2000 | 23.6°C | 18.6°C | 13.5°C | 27.9°C | 9.0°C | 112 mm | 82% | 0.9 m/s | 4.7 |
| 1999 | 25.0°C | 19.4°C | 13.8°C | 30.6°C | 8.8°C | 55 mm | 69% | 0.8 m/s | 5 |
| 1998 | 25.4°C | 20.3°C | 15.1°C | 30.4°C | 8.7°C | 74 mm | 76% | 0.8 m/s | 5 |
| 1997 | 24.0°C | 18.6°C | 13.2°C | 30.3°C | 10.0°C | 89 mm | 73% | 0.9 m/s | 5 |
| 1996 | 25.3°C | 19.5°C | 13.7°C | 29.6°C | 8.4°C | 44 mm | 75% | 0.8 m/s | 5.6 |
| 1995 | 26.8°C | 20.5°C | 14.3°C | 32.6°C | 9.3°C | 75 mm | 68% | 0.9 m/s | 5.4 |
| 1994 | 23.5°C | 18.0°C | 12.5°C | 28.6°C | 7.1°C | 79 mm | 78% | 0.9 m/s | 5.2 |
| 1993 | 26.0°C | 20.5°C | 15.1°C | 30.8°C | 9.6°C | 68 mm | 76% | 0.8 m/s | 5.2 |
| 1992 | 23.2°C | 17.9°C | 12.7°C | 29.0°C | 7.9°C | 93 mm | 80% | 0.9 m/s | 4.7 |
| 1991 | 26.3°C | 20.6°C | 14.9°C | 30.9°C | 9.2°C | 108 mm | 73% | 0.9 m/s | 5 |
| 1990 | 25.3°C | 19.8°C | 14.2°C | 31.4°C | 9.1°C | 112 mm | 78% | 0.8 m/s | 5.2 |
| 1989 | 23.7°C | 18.4°C | 13.0°C | 29.0°C | 5.3°C | 116 mm | 76% | 0.9 m/s | 5.2 |
| 1988 | 25.2°C | 20.1°C | 14.9°C | 32.6°C | 7.7°C | 127 mm | 77% | 0.9 m/s | 4.3 |
| 1987 | 24.2°C | 18.3°C | 12.5°C | 31.3°C | 6.8°C | 59 mm | 71% | 0.9 m/s | 5 |
| 1986 | 22.3°C | 17.1°C | 11.9°C | 29.6°C | 4.0°C | 140 mm | 82% | 0.9 m/s | 4.8 |
| 1985 | 24.0°C | 18.2°C | 12.5°C | 29.5°C | 7.8°C | 70 mm | 73% | 0.9 m/s | 4.8 |
| 1984 | 25.8°C | 20.4°C | 15.0°C | 31.4°C | 6.9°C | 137 mm | 77% | 0.8 m/s | 5.1 |
| 1983 | 25.4°C | 19.9°C | 14.3°C | 28.9°C | 7.3°C | 83 mm | 74% | 0.8 m/s | — |
| 1982 ❄️ | 22.5°C | 16.8°C | 11.2°C | 27.8°C | 3.2°C | 113 mm | 74% | 0.9 m/s | — |
| 1981 | 23.8°C | 18.5°C | 13.2°C | 27.7°C | 7.1°C | 143 mm | 80% | 0.8 m/s | — |
Actual recorded August data for each year, 1981–2025 — sourced from NASA POWER.
The average high in August is around 25.2°C with lows near 14.4°C (mean 19.8°C), based on 45 years of NASA POWER data.
August averages 92 mm of rainfall in Saint-Lazare, about average for rainfall. The wettest on record was 156 mm in 2024.
The hottest August reached 36.2°C in 2025. The coldest dipped to 3.2°C in 1982.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average August temperatures have risen by about 2.4°C. Daytime highs moved from 24.3°C to 26.8°C and overnight lows from 13.2°C to 15.6°C over the same span.
August is one of the warmer months of the year in Saint-Lazare and about average for rainfall, so plan for around 25.2°C daytime highs and 14.4°C at night.
Not quite — August is the 11th coolest month in Saint-Lazare, averaging 19.8°C.
For August in Saint-Lazare, pack light layers you can adjust through the day, with typical highs of 25.2°C and lows of 14.4°C. Bring an umbrella or light rain jacket too.
Relative humidity in August averages 75% — quite humid.
Average wind speed in August is 0.8 m/s. The windiest August on record averaged 0.9 m/s (1982).
The wettest August on record was 2024 with 156 mm. On average, August sees 92 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 August, 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 August specifically, along with year-by-year records and how the month has changed over the decades.
