Extreme rain in United States, 7 to 10 September 2026

Name: Extreme rain in United States, 7 to 10 September 2026
Start: 2026-09-07
End: 2026-09-10
Location: United States

Extreme rain in United States, 7 to 10 September 2026: 12 records at 10 stations, peak on 8 September 2026. Closed.

Data as of 2026-10-17. Last revised 17 October 2026 (2026-10-17).

Key Facts

Extreme rain in United States, 7 to 10 September 2026 set or tied 12 station records at 10 stations.
It ran from 7 September 2026 to 10 September 2026 (4 days) and its peak day was 8 September 2026.
Status: closed.
Koloa Mauka 994 set a monthly record daily precipitation of 190.5 mm (7.5 in) on 8 September 2026 (provisional).
The busiest day was 8 September 2026 with 7 records.
The oldest broken record in the ranked list had stood for 120 years.

Footprint

7 to 10 September 2026

The area covered by Extreme rain in United States, 7 to 10 September 2026 is outlined, with 10 of the stations that set records marked, coloured by record type. Made with Natural Earth.

Footprint of Extreme rain in United States, 7 to 10 September 2026: stations that set records in the event
Station	Type	Value	Date
Koloa Mauka 994	Record daily precipitation	190.5 mm (7.5 in)	2026-09-08
Koloa 936	Record daily precipitation	48.3 mm (1.9 in)	2026-09-08
Mahaulepu 941.1	Record daily precipitation	113.0 mm (4.4 in)	2026-09-08
Naalehu 14	Record daily precipitation	84.6 mm (3.3 in)	2026-09-10
Kapapala Rch 36	Record daily precipitation	91.9 mm (3.6 in)	2026-09-08
Hilo Intl AP 87	Record daily precipitation	45.5 mm (1.8 in)	2026-09-10
Kahului AP	Record daily precipitation	3.0 mm (0.12 in)	2026-09-08
Kaneohe Bay MCAS	Record daily precipitation	21.4 mm (0.8 in)	2026-09-08
Ulupalakua Rch 250	Record daily precipitation	18.8 mm (0.7 in)	2026-09-10
S Kona 2 2.32	Record daily precipitation	13.2 mm (0.5 in)	2026-09-07

Records per Day

Peak day 7

Records set or tied each day from 7 September 2026 to 10 September 2026. The most in one day was 7 on 8 September 2026.

Top Records by Margin

Margin over the record replaced

Top records of Extreme rain in United States, 7 to 10 September 2026 ranked by margin
Koloa Mauka 994, 09-08	87.4 mm (3.4 in)
Naalehu 14, 09-10	65.3 mm (2.6 in)
Kapapala Rch 36, 09-08	58.9 mm (2.3 in)
Naalehu 14, 09-09	47.5 mm (1.9 in)
Koloa 936, 09-08	36.4 mm (1.4 in)
Mahaulepu 941.1, 09-08	24.1 mm (0.9 in)
Kaneohe Bay MCAS, 09-08	14.5 mm (0.6 in)
Hilo Intl AP 87, 09-10	12.5 mm (0.5 in)
Naalehu 14, 09-08	10.4 mm (0.4 in)
S Kona 2 2.32, 09-07	4.3 mm (0.17 in)
Ulupalakua Rch 250, 09-10	1.8 mm (0.07 in)
Kahului AP, 09-08	0.7 mm (0.03 in)

Margin is how far the new value is beyond the record it replaced. Ties are not shown.

Margin Against Age of the Broken Record

12 records plotted by how far they beat the old record (across) and how many years the old record had stood (up). Long standing records beaten by a wide margin sit in the top right.

Compared With Other Events

Station records per event

Station records in Extreme rain in United States, 7 to 10 September 2026 compared with similar events
Extreme rain in United States and Mexico, 23 February to 15 March 2019	2,223 records
Extreme rain in United States, 3 to 19 January 2024	2,133 records
Extreme rain in Australia, 7 to 26 March 2021	2,099 records
Extreme rain in United States and Mexico, 29 September to 19 October 2018	1,970 records
Extreme rain in United States, 19 December 2022 to 13 January 2023	1,941 records
Extreme rain in United States, 7 to 10 September 2026 (this event)	12 records

Every Record Set

12 of 12

Every record set or tied during Extreme rain in United States, 7 to 10 September 2026, in date order
Date	Station	Record	Value	Margin	Years stood	Significance
2026-09-07	S Kona 2 2.32	Record daily precipitation (provisional)	13.2 mm (0.5 in)	4.3 mm (0.17 in)	19	13 of 100 (Routine)
2026-09-08	Koloa Mauka 994	Record daily precipitation (provisional)	190.5 mm (7.5 in)	87.4 mm (3.4 in)	83	83 of 100 (Exceptional)
2026-09-08	Koloa 936	Record daily precipitation (provisional)	48.3 mm (1.9 in)	36.4 mm (1.4 in)	120	80 of 100 (Exceptional)
2026-09-08	Mahaulepu 941.1	Record daily precipitation (provisional)	113.0 mm (4.4 in)	24.1 mm (0.9 in)	39	60 of 100 (Major)
2026-09-08	Kapapala Rch 36	Record daily precipitation (provisional)	91.9 mm (3.6 in)	58.9 mm (2.3 in)	40	51 of 100 (Notable)
2026-09-08	Naalehu 14	Record daily precipitation (provisional)	47.5 mm (1.9 in)	10.4 mm (0.4 in)	40	29 of 100 (Routine)
2026-09-08	Kahului AP	Record daily precipitation (provisional)	3.0 mm (0.12 in)	0.7 mm (0.03 in)	39	20 of 100 (Routine)
2026-09-08	Kaneohe Bay MCAS	Record daily precipitation (provisional)	21.4 mm (0.8 in)	14.5 mm (0.6 in)	43	20 of 100 (Routine)
2026-09-09	Naalehu 14	Record daily precipitation (provisional)	68.1 mm (2.7 in)	47.5 mm (1.9 in)	11	45 of 100 (Notable)
2026-09-10	Naalehu 14	Record daily precipitation (provisional)	84.6 mm (3.3 in)	65.3 mm (2.6 in)	28	58 of 100 (Notable)
2026-09-10	Hilo Intl AP 87	Record daily precipitation (provisional)	45.5 mm (1.8 in)	12.5 mm (0.5 in)	39	26 of 100 (Routine)
2026-09-10	Ulupalakua Rch 250	Record daily precipitation (provisional)	18.8 mm (0.7 in)	1.8 mm (0.07 in)	56	20 of 100 (Routine)

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Download the Data

Source: NOAA National Centers for Environmental Information, Global Historical Climatology Network Daily (GHCN-Daily). Records are computed by World Extreme Weather Monitor and are not official NOAA products. (US Government open data (NOAA NCEI)) Data as of 2026-10-17. Events are found by this site from station records and are not official designations. Records are provisional until reprocessed.