on and off. Hard to predict. Sometimes it only rains in part of Bangkok and the rest is dry. Hit and miss π but I feel safer driving here (and in the rain) than in Europe or the U.S. Maybe it is just my imagination but I feel drivers are more polite and respectful here, in particular towards scooters and motorcycles.
Enter as a tourist, when you have the visa email, leave Thailand and do a trip to one of the neighboring countries, and then return to activate your non-O. However, you need to plan a little as your initial non-O will only be valid for 90 days and you can only file the 1 year extension if you have 30 days left on your original non-O. And you need to plan about a month processing time for the one year extension as this is when you need to submit substantial paperwork.