This page shows the best observability of Mercury over the next few months. The graph will show the time of culmination (highest altitude) unless this would be during daylight, in which case the height shown is at dusk or dawn. Hover over a point to see the time and date.
NB: Mercury is never far from the Sun, so be REALLY careful you do not allow sunrise to happen in your field of view.
Note: the data are for a central UK location. To adjust for your location see advice here.
Downloadable data