If you’re looking forward to lots of outings with your partner, take a look at these details about year-round temperatures in Asnieres-sur-Seine: The hottest months are usually August and July, with an average temperature of 19°C, while the coldest months are January and February, with an average of 6°C. The snowiest months in Asnieres-sur-Seine are February, March, January and April, with each month seeing an average of 14 cm of snowfall.