Long-term weather forecast
Long-term weather forecast

September weather forecast and Climate
Montreux, Switzerland

  • The average high temperature in September: 20.5°C

The warmest month (with the highest average high temperature) is July (24.9°C).
The month with the lowest average high temperature is January (4.5°C).

  • The average low temperature in September: 12°C

The month with the highest average low temperature is July (15.1°C).
The coldest month (with the lowest average low temperature) is January (-0.8°C).

  • The average humidity in September: 78.9%

The month with the highest relative humidity is October (83.2%).
The month with the lowest relative humidity is July (71.3%).

  • The average rainfall in September: 117mm

The wettest month (with the highest rainfall) is August (158mm).
The driest month (with the lowest rainfall) is February (86mm).

  • The average rainfall days in September: 9.5 days

The month with the highest number of rainy days is May (13.8 days).
The month with the lowest number of rainy days is October (8.9 days).

  • The average daylight in September: 13h

The month with the longest days is June (Average daylight: 16h).
Months with shortest days are January, November and December (Average daylight: 9h).

  • The average sunshine in September: 6h

The month with most sunshine is July (Average sunshine: 8h).
The month with least sunshine is December (Average sunshine: 2h).

  • The average UV index in September: 5

Months with the highest UV index are June and July (UV index 8).
Months with the lowest UV index are January and December (UV index 1).