* Standard American English: The "a" in "rain" is a short vowel sound, similar to the "a" in "cat."
* Some Regional Accents: In certain regional accents, the "a" in "rain" might be pronounced with a longer, more drawn-out sound, similar to the "a" in "say."
So, while the typical pronunciation of "rain" doesn't use a long vowel, it's possible to find variations depending on where you are!