Best Made has just what you need for those rainy spring days. Their Japanese Trench is a packable jacket that's ready to go with a lightweight material that's ideal for the summer while its high-tech shell will protect you from any wet or windy scenarios that the weather gods have in store for you.
The high-tech fabric is Japanese material called SAITOS which is a heavy duty, lightweight triple-laminate that is highly resistant to rain, but at the same time is also temperature regulating. It also fits into a pocket-sized bag so you can always be ready in the event of unforeseen weather conditions.
$325, available at bestmadeco.com.