Lyon Weather in September
In September, Lyon averages a high of 23°C (73°F) and a low of 12°C (54°F), from 56 years of daily records (1971–2026).
23°C
Average high
73°F
12°C
Average low
54°F
36°C
Record high
97°F · September 7, 2026
2°C
Record low
35°F · September 22, 1977
What September Is Like in Lyon
- Lyon's hottest September day on record is a recent one: 36°C (97°F) on September 7, 2026.
- September in Lyon has become 2.1°C (3.7°F) warmer on average: the 2012–2026 average against 1970–1989.
- September 2026 was the 2nd warmest September in 56 years of records, 3.5°C (6.4°F) above the long-run average.
- 6 of the 10 warmest Septembers on record in Lyon have come since 2012.
At least 1 mm of rain falls on 24% of September days, and the month averages 82 mm in total.
Warmest: 2023 (27.9°C)Latest: 2026 (27.5°C)10-year averageLong-run average (22.5°C)
Look Up a Day in September
See the weather in Lyon on any September date, year by year.
Source: NOAA GHCN-Daily, Lyon - St Exupery (1971–2026). Averages cover 1971–2026. How we compute this