National Weather Service United States Department of Commerce

Monthly rainfall totals for Honolulu (and other sites) in Hawaii are available via the NOWData tab on the climate webpages. Directions follow on how to retrieve the data.

1. Location: To get the records for a specific location, make sure to select the location and not one labeled "Area". For example, to see the records for Honolulu Airport, you will need to select "Honolulu Intl AP, HI".

2. Product: For the product, select "Calendar day summaries".

3. Options: The Year Range will default to 2000 to 2020. If you want to see all the data available, change the starting year to "por" (Period of Record).

To get all precipitation, choose

Variable: Precipitation

Summary: Sum

4. View: Go to have the window of results pop up. 

Example to request the Monthly Precipitation for Honolulu Intl AP, HI for the Period of Record: