Hydrology in Hawaii

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Mouseover the time to see the rainfall: 11 am 2 pm 5 pm 8 pm 11 pm 2 am 5 am 8 am Rainfall Map

This map is meant to be an approximate depiction of the areas that have had rain over the 3 hour period ending at 2, 5, 8 and 11, am and pm. The map is created using a network of rain gauges, so no data is available over the water. This data is not quality controlled, and the map may not be accurate, particularly in areas where there are few gauges.

Routine Products

Drought Information Statements updated monthly as conditions warrant
Hawai`i Rainfall Summary - issued hourly
- Text file Issued: 04/25/2024 07:45:20 PM HST
- 90 day archive updated several times daily
- Graphical Rainfall Summary (includes station locations)
1 Hourly Rainfall Summary - issued hourly
- Text file Issued: 04/25/2024 07:30:12 PM HST
- 72 Hour Archive
Daily Hawai`i Cooperative Observations
- Text file Issued: 04/25/2024 01:18:16 PM HST
- 30 day archive
- Graphical Coop Summary

Additional Hydrology Resources

Cooperative observation location maps:
- Kaua`i
- O`ahu
- Moloka`i/Lana`i
- Maui
- Hawai`i
Hydrology in Hawai`i
Hydronet automated rain gage network
Hydronet archived data (online)
Monthly Precipitation Summaries - Click to see the last year's worth of summaries
Click to receive notifications of new summaries
Standardized Precipitation Index (SPI) data for Hawai`i
Click to receive notifications of new SPI information
Daily Streamflow Conditions from the USGS