We know of 8 places for Chinese food in Norrmalm and the City. 6 of them have a terrace with sun on a clear day in June. The ones we know most about come first.
With sun on the terrace
PandaFast food · Asian · Vegetarian-friendlyEvening sun until 20:40Sun 11:10–20:40
WeidaoRestaurant · Asian · Vegetarian-friendlyEvening sun until 20:00Sun 07:00–12:00 and 15:30–20:00
TangRestaurant · Asian · Vegetarian-friendlyEvening sun until 19:20Sun 15:50–19:20
Lao LaoRestaurant · Asian · Vegetarian-friendlySun at lunchSun 07:00–16:30