The market is full with water timers, which do not cost a fortune and work quite well. You only need a simple model. Then you can replace it in a few years when it breaks
As for watering in the evenings, it can be done and I do it quite a lot. The problem is with plants like roses, which may develop black spot (fungus) on their leaves, if left wet overnight. However, if you water the plants 2-3 hours before dark, they have enough time to dry down.
The non recommended time for watering is midday, when the sun is high and temps above 85 deg. Adding water in these conditions can actually burn plants and grass.