Weather Ireland/England Feb/March

It won't be snow and cold like Michigan, but the days will be short. Most likely it will be rainy, windy and seem only chilly (rather than cold) to someone who is accustomed to Michigan in winter.

Probably cold. Other than that it could be sunny, wet, or even snowing, there's no way of predicting. If you're here for a fortnight then I wouldn't put much trust in forecasts even the day before you leave the US.

Hi Brooke (from just down the road in A2)
I was in Ireland a few years ago at that time of year and the weather went from sunny, to cloudy and damp, to windy...but no snow. Agree..the days are short, but then it's time to hit the pubs. The real problem we had was there was no heat during the night in any of our hotels (I think it came on about 5 in the morning) I was freezing most nights and after that I found a fleece sleeping bag (in the US after I came home) that I now take with me any time I travel in the winter. After about 9 days of being cold I hopped a flight to Paris in hopes that it would be a little better...at least the hotels had heat. But, we did have a great time and enjoyed Ireland a lot.

Thank you everyone for the advice! This will help when I start packing! :)

The weather is very likely to vary quite a lot depending on where you are. You don't give any clues as to where you will be in the 3 nations. Scotland and especially northern Scotland is likely to be dramatically colder and wetter than southern England for example. I have seen sleet in London in May and snow in London in April. It could be anything, really, so prepare with layers. Last winter was record dryness followed by record wetness. The couple of years before were record coldness. Just be prepared.

The current long term indication for the next month or so is for the below average temperatures to persist in the UK, with periods of frost at night - but how reliable that is may be another matter.