For a comfortable and enjoyable visit to Khlong Toei, the best time to go is during the cool, dry season, which typically runs from November to February.
During these months, you'll experience pleasant temperatures, generally ranging from 20°C to 30°C, with lower humidity. This makes exploring the local markets, street food stalls, and the Benjakitti Forest Park much more comfortable. It's an ideal time for those who enjoy walking around and experiencing the local culture without the intense heat or heavy rain.
The shoulder months of March, October, and early November can also be a good option for travellers looking for slightly fewer crowds and potentially better value on accommodation. While temperatures might be a bit warmer than the peak dry season, and there's a chance of occasional rain, it's generally still suitable for sightseeing and outdoor activities.
Conversely, the hot season from March to May can see temperatures soar above 35°C, making extended outdoor activities less appealing.