Compare a park outing with a river stop
Bangkok's official city information describes Benjakitti Park, one of its large public parks. These are useful starting points for an outdoor break, while a Chao Phraya café is a different type of outing. Locate actual seating and check the relevant access or venue hours.
Do not rely on a European orientation rule
Bangkok lies within the tropics. The sun's seasonal path can pass to the north or south, so “south-facing means the most sun” is not a reliable year-round rule. Use the actual date and local time at your chosen position.
Trees can dominate a park seat
An area without building shade may still be beneath dense vegetation. Coffee in the Sun does not include trees in its building-shadow model. Inspect the seat and distinguish a shaded garden path from a nearby open paved area.
Waterfront seating has its own covers
A terrace beside the river may sit beneath a roof, canopy or the building above. The river also bends, so the open direction changes. Find the real seating area and compare building shadows across the time you plan to stay; verify small covers on site.
Keep weather and comfort in the decision
Clouds, rain and heat are separate from geometric building shade. Check current local conditions and choose shade or a covered fallback when that better suits the outing. Include travel in the arrival time and keep an alternative nearby. The app also excludes terrain and does not calculate exact light at an elevated terrace.
Try the building-shadow check before you leave
Open Coffee in the Sun, find your chosen spot and compare the estimated building shadows at arrival and departure. The free app includes today's timeline and three time jumps per day. The model uses mapped buildings, whose coverage and accuracy vary; it excludes trees, awnings and terrain, and cloud cover is not part of the shadow answer.
Use the five-step terrace check to interpret the result. Keep a nearby alternative and confirm the real seating on arrival.
