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While the stability testing has been reported for these devices, the majority of the reports involve stability testing using storage without illumination, which overestimates the lifetime. The reports on the stability involving light soaking have been relatively scarce, and the data for outdoor testing have been even more scarce with very few research groups reporting outdoor stability. In this talk, degradation mechanisms of organometallic halide perovskite films and devices will be discussed, followed by discussion of device stability under light soaking at elevated temperature, as well as outdoor testing in a hot and humid weather (Hong Kong summer weather). Standard ISOSL2 and ISOS-O1 protocols are used for testing. Different encapsulation strategies, as well as desiccants and protective layers will be discussed. Finally, we demonstrate that with an optimized encapsulation strategy, stable performance for hundreds of hours can be achieved, with testing period including amber rainstorm and typhoon warnings. This indicates that the organometallic halide perovskite solar cells can overcome the stability challenges and that they are indeed among the most promising emerging photovoltaic technologies.