Extreme rain in United States, 17 to 21 September 2021

Name: Extreme rain in United States, 17 to 21 September 2021
Start: 2021-09-17
End: 2021-09-21
Location: United States

Extreme rain in United States, 17 to 21 September 2021: 161 records at 150 stations, peak on 18 September 2021. Closed.

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

Key Facts

Extreme rain in United States, 17 to 21 September 2021 set or tied 161 station records at 150 stations.
It ran from 17 September 2021 to 21 September 2021 (5 days) and its peak day was 18 September 2021.
Status: closed.
Sandpoint Exp STN set a daily record precipitation of 50.8 mm (2.0 in) on 18 September 2021.
The busiest day was 18 September 2021 with 85 records.
The oldest broken record in the ranked list had stood for 107 years.

Footprint

17 to 21 September 2021

The area covered by Extreme rain in United States, 17 to 21 September 2021 is outlined, with 20 of the stations that set records marked, coloured by record type. Made with Natural Earth.

Footprint of Extreme rain in United States, 17 to 21 September 2021: stations that set records in the event
Station	Type	Value	Date
Sandpoint Exp STN	Record daily precipitation	50.8 mm (2.0 in)	2021-09-18
Roseburg Rgnl AP	Record daily precipitation	31.2 mm (1.2 in)	2021-09-18
Forks 1 E	Record daily precipitation	62.2 mm (2.4 in)	2021-09-18
Clearbrook	Record daily precipitation	41.9 mm (1.6 in)	2021-09-18
Blaine	Record daily precipitation	43.7 mm (1.7 in)	2021-09-17
Potato Hill	Record daily precipitation	50.8 mm (2.0 in)	2021-09-18
Headworks Portland Wtr B	Record daily precipitation	72.1 mm (2.8 in)	2021-09-18
Fern Ridge-Veneta	Record daily precipitation	34.5 mm (1.4 in)	2021-09-21
Otis 2 NE	Record daily precipitation	57.7 mm (2.3 in)	2021-09-18
Seaside	Record daily precipitation	49.3 mm (1.9 in)	2021-09-18
Bellingham 3 SSW	Record daily precipitation	40.1 mm (1.6 in)	2021-09-18
Battle Ground	Record daily precipitation	42.7 mm (1.7 in)	2021-09-19
Concrete Ppl Fish STN	Record daily precipitation	57.9 mm (2.3 in)	2021-09-18
Humptulips Salmon Hatchery	Record daily precipitation	92.7 mm (3.6 in)	2021-09-18
Upper Baker Dam	Record daily precipitation	86.4 mm (3.4 in)	2021-09-18
Leaburg 1 SW	Record daily precipitation	54.6 mm (2.1 in)	2021-09-19
Oakridge Fish Hatchery	Record daily precipitation	27.9 mm (1.1 in)	2021-09-19
Willamina	Record daily precipitation	29.2 mm (1.1 in)	2021-09-18
Ashland	Record daily precipitation	19.8 mm (0.8 in)	2021-09-19
Riddle	Record daily precipitation	18.5 mm (0.7 in)	2021-09-19

Records per Day

Peak day 85

Records set or tied each day from 17 September 2021 to 21 September 2021. The most in one day was 85 on 18 September 2021.

Top Records by Margin

Margin over the record replaced

Top records of Extreme rain in United States, 17 to 21 September 2021 ranked by margin
Humptulips Salmon Hatchery, 09-18	49.0 mm (1.9 in)
Potato Hill, 09-18	35.6 mm (1.4 in)
Sandpoint Exp STN, 09-18	33.0 mm (1.3 in)
Upper Baker Dam, 09-18	32.3 mm (1.3 in)
Headworks Portland Wtr B, 09-18	31.2 mm (1.2 in)
Forks 1 E, 09-18	29.4 mm (1.2 in)
Bellingham 3 SSW, 09-18	29.2 mm (1.1 in)
Otis 2 NE, 09-18	29.0 mm (1.1 in)
Leaburg 1 SW, 09-19	24.9 mm (1.0 in)
Seaside, 09-18	22.9 mm (0.9 in)
Blaine, 09-17	20.3 mm (0.8 in)
Concrete Ppl Fish STN, 09-18	19.5 mm (0.8 in)
Roseburg Rgnl AP, 09-18	13.7 mm (0.5 in)
Clearbrook, 09-18	12.9 mm (0.5 in)
Willamina, 09-18	12.7 mm (0.5 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

161 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, 17 to 21 September 2021
Margin (mm)	Years the old record stood
33	24
14	84
29	90
13	107
20	51
36	39
31	52
6	96
12	76
29	52
23	52
8	90
29	11
3	100
20	52
25	32
6	84
49	24
32	52
13	52
13	51
28	55
3	80
20	35
20	24
4	80
16	38
1	90
41	23
11	23
3	74
4	60
8	56
46	23
9	44
22	23
1	66
14	11
16	11
11	44
16	24
8	15
18	2
2	62
8	15
13	35
15	32
14	32
2	52
11	15
15	32
18	4
5	44
1	52
6	36
6	48
30	4
10	35
2	38
0	52
8	11
9	32
1	52
13	4
3	26
5	39
10	32
43	16
1	51
1	62
9	35
8	24
8	40
4	39
5	44
15	11
1	52
5	24
1	56
5	7
8	35
8	24
3	24
3	15
7	2
20	4
9	11
6	11
6	16
11	10
8	32
23	4
10	11
15	4
18	4
2	32
2	40
9	11
10	4
10	15
8	32
8	24
1	38
9	0
6	11
13	4
2	16
5	26
3	35
3	35
10	15
10	16
8	24
5	4
3	40
17	2
15	23
5	4
2	32
3	32
5	32
13	4
6	11
5	4
5	16
8	4
13	4
2	11
5	4
10	2
3	24
3	24
0	10
3	11
3	16
8	4
10	4
1	14
2	16
2	19
5	10
5	11
3	2
7	0
3	23
8	4
1	11
4	4
1	11
5	11
3	14
3	4
5	4
5	4
3	11
1	11
3	10
3	0
3	4
3	4
0	11

Compared With Other Events

Station records per event

Station records in Extreme rain in United States, 17 to 21 September 2021 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, 17 to 21 September 2021 (this event)	161 records

Every Record Set

20 of 161

Every record set or tied during Extreme rain in United States, 17 to 21 September 2021, in date order
Date	Station	Record	Value	Margin	Years stood	Significance
2021-09-17	Blaine	Record daily precipitation	43.7 mm (1.7 in)	20.3 mm (0.8 in)	51	52 of 100 (Notable)
2021-09-18	Sandpoint Exp STN	Record daily precipitation	50.8 mm (2.0 in)	33.0 mm (1.3 in)	24	57 of 100 (Notable)
2021-09-18	Roseburg Rgnl AP	Record daily precipitation	31.2 mm (1.2 in)	13.7 mm (0.5 in)	84	57 of 100 (Notable)
2021-09-18	Forks 1 E	Record daily precipitation	62.2 mm (2.4 in)	29.4 mm (1.2 in)	90	56 of 100 (Notable)
2021-09-18	Clearbrook	Record daily precipitation	41.9 mm (1.6 in)	12.9 mm (0.5 in)	107	53 of 100 (Notable)
2021-09-18	Potato Hill	Record daily precipitation	50.8 mm (2.0 in)	35.6 mm (1.4 in)	39	52 of 100 (Notable)
2021-09-18	Headworks Portland Wtr B	Record daily precipitation	72.1 mm (2.8 in)	31.2 mm (1.2 in)	52	51 of 100 (Notable)
2021-09-18	Otis 2 NE	Record daily precipitation	57.7 mm (2.3 in)	29.0 mm (1.1 in)	52	46 of 100 (Notable)
2021-09-18	Seaside	Record daily precipitation	49.3 mm (1.9 in)	22.9 mm (0.9 in)	52	45 of 100 (Notable)
2021-09-18	Bellingham 3 SSW	Record daily precipitation	40.1 mm (1.6 in)	29.2 mm (1.1 in)	11	45 of 100 (Notable)
2021-09-18	Concrete Ppl Fish STN	Record daily precipitation	57.9 mm (2.3 in)	19.5 mm (0.8 in)	52	44 of 100 (Notable)
2021-09-18	Humptulips Salmon Hatchery	Record daily precipitation	92.7 mm (3.6 in)	49.0 mm (1.9 in)	24	43 of 100 (Notable)
2021-09-18	Upper Baker Dam	Record daily precipitation	86.4 mm (3.4 in)	32.3 mm (1.3 in)	52	43 of 100 (Notable)
2021-09-18	Willamina	Record daily precipitation	29.2 mm (1.1 in)	12.7 mm (0.5 in)	52	42 of 100 (Notable)
2021-09-19	Battle Ground	Record daily precipitation	42.7 mm (1.7 in)	7.6 mm (0.30 in)	90	45 of 100 (Notable)
2021-09-19	Leaburg 1 SW	Record daily precipitation	54.6 mm (2.1 in)	24.9 mm (1.0 in)	32	43 of 100 (Notable)
2021-09-19	Oakridge Fish Hatchery	Record daily precipitation	27.9 mm (1.1 in)	6.1 mm (0.24 in)	84	43 of 100 (Notable)
2021-09-19	Ashland	Record daily precipitation	19.8 mm (0.8 in)	6.3 mm (0.25 in)	96	20 of 100 (Routine)
2021-09-19	Riddle	Record daily precipitation	18.5 mm (0.7 in)	2.8 mm (0.11 in)	100	20 of 100 (Routine)
2021-09-21	Fern Ridge-Veneta	Record daily precipitation	34.5 mm (1.4 in)	11.6 mm (0.5 in)	76	47 of 100 (Notable)

The daily ledgers keep a limited number of records per day, so this list has 20 of the 161 records the event counts. The counts above use the full total.

Related Headlines

Third party news, headline and link only

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
33	24
14	84
29	90
13	107
20	51
36	39
31	52
6	96
12	76
29	52
23	52
8	90
29	11
3	100
20	52
25	32
6	84
49	24
32	52
13	52
13	51
28	55
3	80
20	35
20	24
4	80
16	38
1	90
41	23
11	23
3	74
4	60
8	56
46	23
9	44
22	23
1	66
14	11
16	11
11	44
16	24
8	15
18	2
2	62
8	15
13	35
15	32
14	32
2	52
11	15
15	32
18	4
5	44
1	52
6	36
6	48
30	4
10	35
2	38
0	52
8	11
9	32
1	52
13	4
3	26
5	39
10	32
43	16
1	51
1	62
9	35
8	24
8	40
4	39
5	44
15	11
1	52
5	24
1	56
5	7
8	35
8	24
3	24
3	15
7	2
20	4
9	11
6	11
6	16
11	10
8	32
23	4
10	11
15	4
18	4
2	32
2	40
9	11
10	4
10	15
8	32
8	24
1	38
9	0
6	11
13	4
2	16
5	26
3	35
3	35
10	15
10	16
8	24
5	4
3	40
17	2
15	23
5	4
2	32
3	32
5	32
13	4
6	11
5	4
5	16
8	4
13	4
2	11
5	4
10	2
3	24
3	24
0	10
3	11
3	16
8	4
10	4
1	14
2	16
2	19
5	10
5	11
3	2
7	0
3	23
8	4
1	11
4	4
1	11
5	11
3	14
3	4
5	4
5	4
3	11
1	11
3	10
3	0
3	4
3	4
0	11

Margin (mm)	Years the old record stood
33	24
14	84
29	90
13	107
20	51
36	39
31	52
6	96
12	76
29	52
23	52
8	90
29	11
3	100
20	52
25	32
6	84
49	24
32	52
13	52
13	51
28	55
3	80
20	35
20	24
4	80
16	38
1	90
41	23
11	23
3	74
4	60
8	56
46	23
9	44
22	23
1	66
14	11
16	11
11	44
16	24
8	15
18	2
2	62
8	15
13	35
15	32
14	32
2	52
11	15
15	32
18	4
5	44
1	52
6	36
6	48
30	4
10	35
2	38
0	52
8	11
9	32
1	52
13	4
3	26
5	39
10	32
43	16
1	51
1	62
9	35
8	24
8	40
4	39
5	44
15	11
1	52
5	24
1	56
5	7
8	35
8	24
3	24
3	15
7	2
20	4
9	11
6	11
6	16
11	10
8	32
23	4
10	11
15	4
18	4
2	32
2	40
9	11
10	4
10	15
8	32
8	24
1	38
9	0
6	11
13	4
2	16
5	26
3	35
3	35
10	15
10	16
8	24
5	4
3	40
17	2
15	23
5	4
2	32
3	32
5	32
13	4
6	11
5	4
5	16
8	4
13	4
2	11
5	4
10	2
3	24
3	24
0	10
3	11
3	16
8	4
10	4
1	14
2	16
2	19
5	10
5	11
3	2
7	0
3	23
8	4
1	11
4	4
1	11
5	11
3	14
3	4
5	4
5	4
3	11
1	11
3	10
3	0
3	4
3	4
0	11

Margin (mm)	Years the old record stood
33	24
14	84
29	90
13	107
20	51
36	39
31	52
6	96
12	76
29	52
23	52
8	90
29	11
3	100
20	52
25	32
6	84
49	24
32	52
13	52
13	51
28	55
3	80
20	35
20	24
4	80
16	38
1	90
41	23
11	23
3	74
4	60
8	56
46	23
9	44
22	23
1	66
14	11
16	11
11	44
16	24
8	15
18	2
2	62
8	15
13	35
15	32
14	32
2	52
11	15
15	32
18	4
5	44
1	52
6	36
6	48
30	4
10	35
2	38
0	52
8	11
9	32
1	52
13	4
3	26
5	39
10	32
43	16
1	51
1	62
9	35
8	24
8	40
4	39
5	44
15	11
1	52
5	24
1	56
5	7
8	35
8	24
3	24
3	15
7	2
20	4
9	11
6	11
6	16
11	10
8	32
23	4
10	11
15	4
18	4
2	32
2	40
9	11
10	4
10	15
8	32
8	24
1	38
9	0
6	11
13	4
2	16
5	26
3	35
3	35
10	15
10	16
8	24
5	4
3	40
17	2
15	23
5	4
2	32
3	32
5	32
13	4
6	11
5	4
5	16
8	4
13	4
2	11
5	4
10	2
3	24
3	24
0	10
3	11
3	16
8	4
10	4
1	14
2	16
2	19
5	10
5	11
3	2
7	0
3	23
8	4
1	11
4	4
1	11
5	11
3	14
3	4
5	4
5	4
3	11
1	11
3	10
3	0
3	4
3	4
0	11