Weather in the Cotswolds
Does it always rain? No, it doesn't. And when it does, it is frequently a manable drizzle. We spent January and February 2008 in the Cotswolds. We needed winter coats, hats and gloves, but not for the whole time. We got rain and even snow one day in January, but February was mild and sunny.
May is a good time to visit because the gardens are in bloom and the woods are full of the green and white garlic flowers and bluebells. We have been there in May a few times, usually with sunny days and not much rain, but once with a lot of rain. Even though it is mild, it can be cold. I usually wear a fleece vest in Santa Fe in the cold months, but in England the cold is a bit more piercing, so you need a fleece jacket even in May.
It can be hot in July and August. September can be nice, but when we spent that month there a few years ago it was sunny and warm for the first half, raining for the second half.
I find the weather is unpredictable. Always bring something for cold weather and bring rain gear. If hiking, be prepared for mud.
Met Office Blog: Read this blog for weather news.
Weather Comparisons: I compared Cotswolds weather (Stroud) to Santa Fe NM, Seattle WA, Vancouver BC Canada and Rome Italy. From these five places, Santa Fe is the dryest and Vancouver the wettest. Comparing Stroud in the Cotswolds to Vancouver Canada, Vancouver gets almost twice as much rain and the temperatures are similar. See the comparison charts.