It's almost always off, but this is ridiculous.
Hilo (east Big Island) saw 0.94 inches of rain on August 19, 2017. Computer models had predicted absolutely no rain would fall on that day.
In other related news, check out these two records that was set last week:
The daily high in Honolulu (Oahu) was 91 degrees Fahrenheit on August 17, 2017. This ties a record set in 1968.
A new daily low of 46 degrees Fahrenheit was set in the Bradshaw Army Airfield (west Big Island) on August 17, 2017. I couldn't find information about the previous record.