Paul Elliott’s review published on Letterboxd:
Continuing the adventures of characters first introduced in the previous year in Panda Kopanda, Panda Kopanda and the Rainy-Day Circus is another historical treasure from Studio Ghibli co-founders Hayao Miyazaki and Isao Takahata. The household consisting of two pandas and a little girl living happily together is disrupted when they are joined by a tiger cub who has escaped from a circus, and an unrelenting rainstorm develops.
As before, there are a variety of some agreeable implications and ideas on display, and the animation is of a favourable quality. While it's perhaps not adequately sophisticated enough to attract an older casual viewer, as it's undoubtedly conducted towards a young audience, it's extraordinarily executed, and the filmmaker's love of animals is positively noticeable by the attention to detail provided in bringing the animals to life. It's certainly been put together to inspire optimism and is overall pleasantly charming.