On This Day, 21 September: Notable Weather Records
20 notable weather records on 21 September across the years, led by Mtn Dell Dam, US, with events and storms for the date.
Key Facts for 21 September
- 20 notable weather records were set or tied on 21 September in 14 years (1959 to 2022).
- Mtn Dell Dam set an all-time record daily precipitation of 127.3 mm (5.0 in) on 21 September 2004.
- 5 extreme weather events peaked on 21 September.
- 5 named storms were active on 21 September.
Records on 21 September Through the Years
1959 to 2022| Date | Kind | Detail |
|---|---|---|
| 1959-09-21 | Record daily precipitation | Bonang, 118.4 mm (4.7 in) |
| 1967-09-21 | Record daily precipitation | Mainz-Lerchenberg (Zdf), 47.1 mm (1.9 in) |
| 1967-09-21 | Record daily precipitation | Cuero, 276.9 mm (10.9 in) |
| 1982-09-21 | Record daily precipitation | Gloucester Post Office, 87.2 mm (3.4 in) |
| 1987-09-21 | Record daily precipitation | Hanover (Pol), 55.0 mm (2.2 in) |
| 1990-09-21 | Record daily precipitation | Wagoner, 142.5 mm (5.6 in) |
| 1993-09-21 | Record daily precipitation | Cape St. Francis, 67.0 mm (2.6 in) |
| 1995-09-21 | Record daily snowfall | Byers 5 ENE, 30.5 cm (12.0 in) |
| 1996-09-21 | Record daily precipitation | Strathmore, 50.0 mm (2.0 in) |
| 1998-09-21 | Record daily precipitation | Wanaaring Post Office, 40.6 mm (1.6 in) |
| 1998-09-21 | Record daily precipitation | Montevallo, 152.9 mm (6.0 in) |
| 2003-09-21 | Record daily precipitation | La Soledad Nte, 359.9 mm (14.2 in) |
| 2004-09-21 | Record daily precipitation | Mtn Dell Dam, 127.3 mm (5.0 in) |
| 2009-09-21 | Record daily precipitation | Seymour 1 WSW, 74.2 mm (2.9 in) |
| 2009-09-21 | Record daily precipitation | Walhalla, 212.9 mm (8.4 in) |
| 2017-09-21 | Record daily precipitation | Williams, 35.2 mm (1.4 in) |
| 2022-09-21 | Record daily precipitation | Loxton (Pyap), 33.6 mm (1.3 in) |
| 2022-09-21 | Record daily precipitation | Paruna, 32.4 mm (1.3 in) |
| 2022-09-21 | Record daily precipitation | Hawker (Warcowie), 35.2 mm (1.4 in) |
| 2022-09-21 | Record daily precipitation | Renmark Irrigation, 38.2 mm (1.5 in) |
Notable Records
| Date | Station | Record | Value | Beat old record by | Old record stood | Significance |
|---|---|---|---|---|---|---|
| 21 September 2004 | Mtn Dell Dam, US | all-time rain | 127.3 mm (5.0 in) | 65.8 mm (2.6 in) | 77 years | 91 of 100 (Exceptional) |
| 21 September 1995 | Byers 5 ENE, US | daily snowfall | 30.5 cm (12.0 in) | 30.5 cm (12.0 in) | 99 years | 79 of 100 (Major) |
| 21 September 2022 | Loxton (Pyap), AU | daily rain | 33.6 mm (1.3 in) | 26.0 mm (1.0 in) | 99 years | 79 of 100 (Major) |
| 21 September 2022 | Paruna, AU | daily rain | 32.4 mm (1.3 in) | 24.5 mm (1.0 in) | 99 years | 79 of 100 (Major) |
| 21 September 1987 | Hanover (Pol), ZA | daily rain | 55.0 mm (2.2 in) | 38.7 mm (1.5 in) | 98 years | 79 of 100 (Major) |
| 21 September 1967 | Mainz-Lerchenberg (Zdf), DE | monthly rain | 47.1 mm (1.9 in) | 17.5 mm (0.7 in) | 70 years | 78 of 100 (Major) |
| 21 September 2022 | Hawker (Warcowie), AU | daily rain | 35.2 mm (1.4 in) | 26.1 mm (1.0 in) | 135 years | 77 of 100 (Major) |
| 21 September 2022 | Renmark Irrigation, AU | daily rain | 38.2 mm (1.5 in) | 21.7 mm (0.9 in) | 135 years | 77 of 100 (Major) |
| 21 September 1996 | Strathmore, AU | daily rain | 50.0 mm (2.0 in) | 50.0 mm (2.0 in) | 102 years | 77 of 100 (Major) |
| 21 September 1998 | Wanaaring Post Office, AU | daily rain | 40.6 mm (1.6 in) | 27.6 mm (1.1 in) | 107 years | 76 of 100 (Major) |
| 21 September 1982 | Gloucester Post Office, AU | daily rain | 87.2 mm (3.4 in) | 57.5 mm (2.3 in) | 90 years | 76 of 100 (Major) |
| 21 September 2017 | Williams, AU | daily rain | 35.2 mm (1.4 in) | 22.5 mm (0.9 in) | 88 years | 76 of 100 (Major) |
| 21 September 2009 | Seymour 1 WSW, US | daily rain | 74.2 mm (2.9 in) | 55.1 mm (2.2 in) | 88 years | 76 of 100 (Major) |
| 21 September 2009 | Walhalla, US | daily rain | 212.9 mm (8.4 in) | 172.3 mm (6.8 in) | 88 years | 76 of 100 (Major) |
| 21 September 1998 | Montevallo, US | monthly rain | 152.9 mm (6.0 in) | 64.8 mm (2.6 in) | 55 years | 76 of 100 (Major) |
| 21 September 2003 | La Soledad Nte, MX | all-time rain | 359.9 mm (14.2 in) | 139.9 mm (5.5 in) | 40 years | 76 of 100 (Major) |
| 21 September 1993 | Cape St. Francis, ZA | daily rain | 67.0 mm (2.6 in) | 41.0 mm (1.6 in) | 108 years | 75 of 100 (Major) |
| 21 September 1990 | Wagoner, US | daily rain | 142.5 mm (5.6 in) | 84.1 mm (3.3 in) | 88 years | 75 of 100 (Major) |
| 21 September 1967 | Cuero, US | monthly rain | 276.9 mm (10.9 in) | 106.7 mm (4.2 in) | 64 years | 75 of 100 (Major) |
| 21 September 1959 | Bonang, AU | monthly rain | 118.4 mm (4.7 in) | 42.2 mm (1.7 in) | 63 years | 75 of 100 (Major) |
Events
Storms
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 2026-10-12 (12 October 2026). Records are computed by this site and are not official.
Data as of . Last revised (2026-10-12).