You'd better think about taking "atmospheric" scenes - people walking to work in the rain, traffic stuck (in the rain), puddles, reflections, dark cloudy landscapes, etc. Whilst Northern Ireland has immense beauty, November is not the best time to show it at its best as the previous post suggested. Be sure to take an umbrella, waterproof clothing and check the weather forecasts regularly.
As I've heard several times, its not a question of whether or not its raining, but one of how much?