Umbrella

Are you asking if it will rain during your trip? No one can say for sure, but probably yes.
If you're asking whether you should use an umbrella when it rains on your trip to Scotland, you are correct: the answer is no. A waterproof rain jacket and maybe a ball cap to keep the hood from falling in your face. If your wife wants to bring an umbrella, she's a big girl. Let her make that mistake for herself. As long as she doesn't expect you to hold it over her.
Have a great trip!

Many umbrellas are too weak for the wind, especially the small travel umbrellas. Various hotels offer the big, heavy duty ones that do help, but then one must try not to lose them. I prefer rain pants and waterproof shoes. And- Your chances a rain throughout one part of each day is high, IMHO.
Have a great trip!

Pat beat me to it. Your wife may just fly away if she's holding on to the umbrella too tight.

Out in the country, chances are if it's rainy it will also be windy. Good way to trash an umbrella. In the towns and cities you'll be walking closely with your group and amidst lots of other locals ( and other tour groups) doing the same thing. That umbrella will get jostled and bumped, not to mention poking or jabbing other pedestrians. Explain that, then let her decide. You get to stand back and count the side eyes.

Pat had the right answer.

Be sure your raincoat/jacket is waterproof not water resistant. I bring a waterproof baseball cap to wear under my too big hood. It keeps the rain off my face and glasses.

We always take a couple of the small, folding umbrellas. Use them about a third of the time. One of very few items we take for, "Just in case..."

Well, I don't know about you, but if I bring an umbrella, clear skies are a sure thing.

My husband bought me an umbrella after me complaining during trips that umbrellas are annoying and worthless. I actually used the umbrella for a 3 mile hike in the mountains of Australia and it did make the hike in moderate rain a whole lot more pleasant. The brand is Shed Rain and it does hold up well to wind.

If you don’t bring one, you will be able to buy one there.

I always bring an umbrella. I mostly use the umbrella in cities. When standing in the pouring rain listening to a tour guide, I like an umbrella. I also have a jacket with a hood. The hood works better in light rain or when walking in the countryside or when it is too windy for an umbrella.

I moved to Scotland more than 10 years ago. I have never used an umbrella since moving here. Not because it doesn't rain. It does - nearly every day. But it's always much too windy to make an umbrella anything other than a complete nuisance. And also hopeless in cities as they just take up excess space and poke people's eyes.

I always used to take an umbrella on holiday 'just in case' but never used it. I found it more of a hindance than a help and gave up. Now you can buy reliable waterproof jackets with hoods the umbrella is becoming redundant.

I have a small, foldable umbrella that stays in the pocket of my jacket. iIt's about six inches long when collapsed.

If it's not too windy, I'll use the umbrella. Put since it is small, too much wind and it will be destroyed.

As stated, more important is a waterproof jacket with hood. I'd also suggest some type of hat with a brim to wear under the hood to keep rain off your face.

I have lived in Scotland for most of my 70 years and have owned umbrellas for very short periods, they never last long, i prefer a waterproof and a flat cap as has been suggested .

I will provide a slightly different point of view. It rains a lot here and I use an umbrella all the time. I used to live in Edinburgh and I used it there all the time, too. There are some situations where it won't be useful, like in high winds or on very crowded streets. But in general I try to avoid going out in particularly rainy and windy conditions. I don't see anything wrong with bringing a travel umbrella if your wife prefers to bring one.

Picture a chocolate fire guard. This is how useful an umbrella is in Scotland.

A brolly is fine if it's not too windy. It's not windy all the time (except maybe on Skye!). When lived in Scotland I always kept a big golf umbrella in the car and used it often.