Extreme rain in United States, 22 to 29 August 2018

Name: Extreme rain in United States, 22 to 29 August 2018
Start: 2018-08-22
End: 2018-08-29
Location: United States

Extreme rain in United States, 22 to 29 August 2018: 113 records at 57 stations, peak on 28 August 2018. Closed.

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

Key Facts

Extreme rain in United States, 22 to 29 August 2018 set or tied 113 station records at 57 stations.
It ran from 22 August 2018 to 29 August 2018 (8 days) and its peak day was 28 August 2018.
Status: closed.
Paauilo 221 set a monthly record daily precipitation of 374.7 mm (14.8 in) on 22 August 2018.
The busiest day was 28 August 2018 with 34 records.
The oldest broken record in the ranked list had stood for 95 years.

Footprint

22 to 29 August 2018

The area covered by Extreme rain in United States, 22 to 29 August 2018 is outlined, with 16 of the stations that set records marked, coloured by record type. Made with Natural Earth.

Footprint of Extreme rain in United States, 22 to 29 August 2018: stations that set records in the event
Station	Type	Value	Date
Paauilo 221	Record daily precipitation	374.7 mm (14.8 in)	2018-08-22
Honokaa Town 215	Record daily precipitation	348.0 mm (13.7 in)	2018-08-23
Makaweli 965	Record daily precipitation	63.0 mm (2.5 in)	2018-08-29
Princeville Rch 1117	Record daily precipitation	214.6 mm (8.4 in)	2018-08-28
Keaau 92	Record daily precipitation	406.4 mm (16.0 in)	2018-08-23
Moloaa 1145	Record daily precipitation	85.9 mm (3.4 in)	2018-08-27
Kapalama 773	Record daily precipitation	129.5 mm (5.1 in)	2018-08-28
Puhi 1013	Record daily precipitation	58.4 mm (2.3 in)	2018-08-28
Koloko Rsvr 1137	Record daily precipitation	134.9 mm (5.3 in)	2018-08-28
UNIV of Hawaii 713	Record daily precipitation	45.7 mm (1.8 in)	2018-08-28
Brydeswood STN 985	Record daily precipitation	99.1 mm (3.9 in)	2018-08-29
Hilo Intl AP 87	Record daily precipitation	381.0 mm (15.0 in)	2018-08-24
Kapapala Rch 36	Record daily precipitation	351.8 mm (13.9 in)	2018-08-24
Beretania Pump STN 705	Record daily precipitation	53.3 mm (2.1 in)	2018-08-28
Waialae-Kahala 715	Record daily precipitation	38.6 mm (1.5 in)	2018-08-28
Wahiawa 930	Record daily precipitation	50.8 mm (2.0 in)	2018-08-26

Records per Day

Peak day 34

Records set or tied each day from 22 August 2018 to 29 August 2018. The most in one day was 34 on 28 August 2018.

Top Records by Margin

Margin over the record replaced

Top records of Extreme rain in United States, 22 to 29 August 2018 ranked by margin
Paauilo 221, 08-23	267.2 mm (10.5 in)
Kapapala Rch 36, 08-24	214.6 mm (8.4 in)
Honokaa Town 215, 08-23	174.5 mm (6.9 in)
Honokaa Town 215, 08-24	141.0 mm (5.6 in)
Hilo Intl AP 87, 08-24	136.1 mm (5.4 in)
Keaau 92, 08-23	110.7 mm (4.4 in)
Princeville Rch 1117, 08-28	110.2 mm (4.3 in)
Brydeswood STN 985, 08-29	90.0 mm (3.5 in)
Paauilo 221, 08-22	87.7 mm (3.5 in)
Koloko Rsvr 1137, 08-28	80.3 mm (3.2 in)
Moloaa 1145, 08-27	76.8 mm (3.0 in)
Princeville Rch 1117, 08-29	61.7 mm (2.4 in)
Makaweli 965, 08-29	49.8 mm (2.0 in)
Puhi 1013, 08-28	44.9 mm (1.8 in)
Beretania Pump STN 705, 08-28	43.4 mm (1.7 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

113 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.

Margin against age of the broken record in Extreme rain in United States, 22 to 29 August 2018
Margin (mm)	Years the old record stood
88	95
175	78
50	84
141	77
110	51
267	73
111	47
30	51
77	64
62	69
45	69
32	69
80	69
90	67
31	57
136	27
43	57
215	24
21	57
34	52
30	52
62	37
38	48
61	37
30	52
75	32
53	80
52	37
86	37
81	36
55	36
165	17
46	76
135	36
41	17
8	60
41	11
34	53
20	52
35	5
108	1
30	20
70	4
45	48
53	3
54	5
39	3
68	3
13	29
19	40
21	48
20	36
4	92
10	67
7	69
8	59
8	69
11	57
14	27
52	1
22	55
8	67
19	24
25	23
34	3
5	69
35	31
24	16
32	11
6	14
19	3
23	3
8	44
17	5
8	31
3	57
36	3
2	63
5	44
36	1
6	12
6	27
23	3
4	35
12	36
3	27
13	36
19	17
7	27
10	31
17	3
8	27
3	27
1	44
5	23
3	43
6	17
8	5
1	23
2	17
7	12
3	27
10	3
12	9
13	20
2	17
3	12
2	23
4	8
2	3
1	23
2	11
5	3

Compared With Other Events

Station records per event

Station records in Extreme rain in United States, 22 to 29 August 2018 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, 22 to 29 August 2018 (this event)	113 records

Every Record Set

20 of 113

Every record set or tied during Extreme rain in United States, 22 to 29 August 2018, in date order
Date	Station	Record	Value	Margin	Years stood	Significance
2018-08-22	Paauilo 221	Record daily precipitation	374.7 mm (14.8 in)	87.7 mm (3.5 in)	95	88 of 100 (Exceptional)
2018-08-23	Honokaa Town 215	Record daily precipitation	348.0 mm (13.7 in)	174.5 mm (6.9 in)	78	83 of 100 (Exceptional)
2018-08-23	Paauilo 221	Record daily precipitation	305.6 mm (12.0 in)	267.2 mm (10.5 in)	73	72 of 100 (Major)
2018-08-23	Keaau 92	Record daily precipitation	406.4 mm (16.0 in)	110.7 mm (4.4 in)	47	69 of 100 (Major)
2018-08-24	Honokaa Town 215	Record daily precipitation	241.3 mm (9.5 in)	141.0 mm (5.6 in)	77	73 of 100 (Major)
2018-08-24	Hilo Intl AP 87	Record daily precipitation	381.0 mm (15.0 in)	136.1 mm (5.4 in)	27	65 of 100 (Major)
2018-08-24	Kapapala Rch 36	Record daily precipitation	351.8 mm (13.9 in)	214.6 mm (8.4 in)	24	63 of 100 (Major)
2018-08-26	Wahiawa 930	Record daily precipitation	50.8 mm (2.0 in)	34.0 mm (1.3 in)	52	62 of 100 (Major)
2018-08-27	Moloaa 1145	Record daily precipitation	85.9 mm (3.4 in)	76.8 mm (3.0 in)	64	68 of 100 (Major)
2018-08-28	Princeville Rch 1117	Record daily precipitation	214.6 mm (8.4 in)	110.2 mm (4.3 in)	51	73 of 100 (Major)
2018-08-28	Kapalama 773	Record daily precipitation	129.5 mm (5.1 in)	30.4 mm (1.2 in)	51	68 of 100 (Major)
2018-08-28	Puhi 1013	Record daily precipitation	58.4 mm (2.3 in)	44.9 mm (1.8 in)	69	68 of 100 (Major)
2018-08-28	Koloko Rsvr 1137	Record daily precipitation	134.9 mm (5.3 in)	80.3 mm (3.2 in)	69	67 of 100 (Major)
2018-08-28	UNIV of Hawaii 713	Record daily precipitation	45.7 mm (1.8 in)	30.5 mm (1.2 in)	57	66 of 100 (Major)
2018-08-28	Beretania Pump STN 705	Record daily precipitation	53.3 mm (2.1 in)	43.4 mm (1.7 in)	57	63 of 100 (Major)
2018-08-28	Waialae-Kahala 715	Record daily precipitation	38.6 mm (1.5 in)	21.3 mm (0.8 in)	57	63 of 100 (Major)
2018-08-29	Makaweli 965	Record daily precipitation	63.0 mm (2.5 in)	49.8 mm (2.0 in)	84	75 of 100 (Major)
2018-08-29	Princeville Rch 1117	Record daily precipitation	110.7 mm (4.4 in)	61.7 mm (2.4 in)	69	68 of 100 (Major)
2018-08-29	Puhi 1013	Record daily precipitation	57.2 mm (2.3 in)	31.5 mm (1.2 in)	69	68 of 100 (Major)
2018-08-29	Brydeswood STN 985	Record daily precipitation	99.1 mm (3.9 in)	90.0 mm (3.5 in)	67	66 of 100 (Major)

The daily ledgers keep a limited number of records per day, so this list has 20 of the 113 records the event counts. The counts above use the full total.

Related Headlines

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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.

Margin (mm)	Years the old record stood
88	95
175	78
50	84
141	77
110	51
267	73
111	47
30	51
77	64
62	69
45	69
32	69
80	69
90	67
31	57
136	27
43	57
215	24
21	57
34	52
30	52
62	37
38	48
61	37
30	52
75	32
53	80
52	37
86	37
81	36
55	36
165	17
46	76
135	36
41	17
8	60
41	11
34	53
20	52
35	5
108	1
30	20
70	4
45	48
53	3
54	5
39	3
68	3
13	29
19	40
21	48
20	36
4	92
10	67
7	69
8	59
8	69
11	57
14	27
52	1
22	55
8	67
19	24
25	23
34	3
5	69
35	31
24	16
32	11
6	14
19	3
23	3
8	44
17	5
8	31
3	57
36	3
2	63
5	44
36	1
6	12
6	27
23	3
4	35
12	36
3	27
13	36
19	17
7	27
10	31
17	3
8	27
3	27
1	44
5	23
3	43
6	17
8	5
1	23
2	17
7	12
3	27
10	3
12	9
13	20
2	17
3	12
2	23
4	8
2	3
1	23
2	11
5	3

Margin (mm)	Years the old record stood
88	95
175	78
50	84
141	77
110	51
267	73
111	47
30	51
77	64
62	69
45	69
32	69
80	69
90	67
31	57
136	27
43	57
215	24
21	57
34	52
30	52
62	37
38	48
61	37
30	52
75	32
53	80
52	37
86	37
81	36
55	36
165	17
46	76
135	36
41	17
8	60
41	11
34	53
20	52
35	5
108	1
30	20
70	4
45	48
53	3
54	5
39	3
68	3
13	29
19	40
21	48
20	36
4	92
10	67
7	69
8	59
8	69
11	57
14	27
52	1
22	55
8	67
19	24
25	23
34	3
5	69
35	31
24	16
32	11
6	14
19	3
23	3
8	44
17	5
8	31
3	57
36	3
2	63
5	44
36	1
6	12
6	27
23	3
4	35
12	36
3	27
13	36
19	17
7	27
10	31
17	3
8	27
3	27
1	44
5	23
3	43
6	17
8	5
1	23
2	17
7	12
3	27
10	3
12	9
13	20
2	17
3	12
2	23
4	8
2	3
1	23
2	11
5	3

Margin (mm)	Years the old record stood
88	95
175	78
50	84
141	77
110	51
267	73
111	47
30	51
77	64
62	69
45	69
32	69
80	69
90	67
31	57
136	27
43	57
215	24
21	57
34	52
30	52
62	37
38	48
61	37
30	52
75	32
53	80
52	37
86	37
81	36
55	36
165	17
46	76
135	36
41	17
8	60
41	11
34	53
20	52
35	5
108	1
30	20
70	4
45	48
53	3
54	5
39	3
68	3
13	29
19	40
21	48
20	36
4	92
10	67
7	69
8	59
8	69
11	57
14	27
52	1
22	55
8	67
19	24
25	23
34	3
5	69
35	31
24	16
32	11
6	14
19	3
23	3
8	44
17	5
8	31
3	57
36	3
2	63
5	44
36	1
6	12
6	27
23	3
4	35
12	36
3	27
13	36
19	17
7	27
10	31
17	3
8	27
3	27
1	44
5	23
3	43
6	17
8	5
1	23
2	17
7	12
3	27
10	3
12	9
13	20
2	17
3	12
2	23
4	8
2	3
1	23
2	11
5	3