| Saint-Julien-sur-Reyssouze | |
| Commune Status: | Commune |
| Arrondissement: | Bourg-en-Bresse |
| Canton: | Replonges |
| Insee: | 01367 |
| Postal Code: | 01560 |
| Mayor: | Nathalie Ligeron[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | CA Bassin de Bourg-en-Bresse |
| Coordinates: | 46.4025°N 5.1119°W |
| Elevation M: | 192 |
| Elevation Min M: | 182 |
| Elevation Max M: | 218 |
| Area Km2: | 7.52 |
Saint-Julien-sur-Reyssouzè (pronounced as /fr/, literally Saint-Julien on Reyssouze) is a commune in the Ain department in eastern France.
Saint-Julien-sur-Reyssouze has an oceanic climate (Köppen climate classification Cfb). The average annual temperature in Saint-Julien-sur-Reyssouze is . The average annual rainfall is with November as the wettest month. The temperatures are highest on average in July, at around, and lowest in January, at around . The highest temperature ever recorded in Saint-Julien-sur-Reyssouze was on 13 August 2003; the coldest temperature ever recorded was on 20 December 2009.