| May 1998 | Tornado (F3) | Washington | 28 hurt, $9,000,000 | no account filed |
| May 2000 | Hail | Washington | $2,000,000 | no account filed |
| June 2009 | Flash Flood | Washington | $100,000 | Heavy rains have resulted in flash flooding in Washington, IA during the evening of June 21 and early morning hours of June 22. The basement of a residence was flooded. |
| July 2007 | Tornado (EF1) | Washington | $100,000 | A tornado touched down on the east side of town. It moved south and lifted approximately one half mile south of town.||A car dealership and nearby storage garage were damaged in Washington. A car and small pickup truck were reported to be briefly lifted and dropped. Numerous tree limbs and branches were down throughout town.| |
| May 1996 | Thunderstorm Wind | Washington | $100,000 | no account filed |
| August 2010 | Lightning | Washington | $50,000 | Lightning struck an apartment building at 311 E Main Street in Washington, IA during the evening of August 13 resulting in a fire. Fire-fighting crews were dispatched at 1004 pm CDT. |
| July 2003 | Thunderstorm Wind | Washington | $50,000 | 15 inch diameter tree down |
| August 2003 | Thunderstorm Wind | Washington | $50,000 | Many trees down along with a power pole. Power out due to downed lines and a blow transformer. |
| April 2006 | Thunderstorm Wind | Washington | $25,000 | Damage was first noted by law enforcement on a farmstead on 220th Street. The owners report the loss of the porch roof with windows blown out of the house. A machine shed had a wall caved in with power lines down. |
| April 2006 | Tornado (F2) | Washington | $25,000 | Rated F2 |
| September 2013 | Thunderstorm Wind | Washington | $20,000 | Law Enforcement reported that trees were down along with roof and vehicle damage at the Washington Golf and Country Club. The time of this event was estimated from radar. |
| May 1996 | Thunderstorm Wind | Washington | $20,000 | no account filed |
| June 2010 | Flash Flood | Washington | $10,000 | Heavy rains resulted in flash flooding of E Washington Street and W 3rd Street in Washington, IA during the late morning of June 15. The flood waters receded by 12 pm. |
| September 2005 | Hail | Washington | $10,000 | Also reported by spotters. |
| August 2000 | Thunderstorm Wind | Washington | $10,000 | no account filed |
| June 2007 | Thunderstorm Wind | Washington | $5,000 | A roof of a mobile home was blown off. It then struck another mobile home nearby. Delayed report. |
| April 2006 | Thunderstorm Wind | Washington | $5,000 | First discovered by law enforcement. Owners report a utility shed was flattened and scattered across the property. |
| July 2003 | Heavy Rain | Washington | $5,000 | in 90 minutes |
| May 2000 | Thunderstorm Wind | Washington | $5,000 | A house trailer being transported was blown onto it's side by high winds. |
| April 2006 | Thunderstorm Wind | Washington | $4,000 | Power lines were downed on 220th Street just west of County W61 by a downburst from the mesocyclone of the Washington tornado or a rear flank downdraft. Winds estimated at 61 knots (70 mph). |
| March 2006 | Hail | Washington | $3,000 | just west of town |
| July 2003 | Heavy Rain | Washington | $2,000 | in 10 minutes |
| August 2000 | Thunderstorm Wind | Washington | $2,000 | Tree downed on power line. |
| May 1999 | Thunderstorm Wind | Washington | $2,000 | Severe winds tore the metal roof from a welding shop and blew it into a neighboring business. |
| June 1998 | Thunderstorm Wind | Washington | $1,500 | Thunderstorm winds toppled trees across the city. |
| July 2006 | Thunderstorm Wind | Washington | $1,000 | 2 to 3 inch diameter branches down |
| October 2004 | Thunderstorm Wind | Washington | $1,000 | Measured at Sheriff Department. KAWG AWOS about 2 miles southeast recorded a gust of 49 knots from 1940-1950 CST. |
| June 2000 | Thunderstorm Wind | Washington | $1,000 | no account filed |
| April 2026 | Tornado (EF1) | Washington | - | An EF1 tornado with estimated max winds of 100-105 mph begun roughly 3 miles east-northeast of West Chester, IA. Along its 5.3 mile path, it snapped several power poles and tree trunks, along with ripping sheet metal roofs off of farm outbuildings. A semi truck was also tipped over near the intersection of State Highway 1 and 92, which can be associated with a localized wind surge south of the tornado. |
| March 2025 | Thunderstorm Wind | Washington | - | Wind measured at the Washington county EOC. |
| March 2025 | Thunderstorm Wind | Washington | - | A machine shed and cattle shed were destroyed, both of these buildings had open sides to the south. The time was estimated from radar information and Washington Airport AWOS equipement. |
| March 2025 | Thunderstorm Wind | Washington | - | A measured 74 MPH wind gust was recorded north of Washington on G36. |
| July 2025 | Flash Flood | Washington | - | Law Enforcement Officers reported several street in Washington were flooded. Several streets in Washington were flooded. |
| July 2025 | Flash Flood | Washington | - | A trained spotter and law enforcement reported that an underpass on 2nd Ave is flooded and impassable. |
| May 2024 | Thunderstorm Wind | Washington | - | Numerous branches down down, on the south side of town, along with a couple of trees. The time was based on radar data. |
| May 2024 | Thunderstorm Wind | Washington | - | A large tree was blown down. The time was estimated by radar data. |
| July 2024 | Thunderstorm Wind | Washington | - | A public report that a neighbors fence was blown over as well as a weighted basketball hoop. The time of the event was estimated using radar. |
| June 2023 | Thunderstorm Wind | Washington | - | A tree was blown down, onto a power line. |
| July 2023 | Thunderstorm Wind | Washington | - | Several trees down in the city. One large tree fell on a house and vehicle. |
| May 2023 | Hail | Washington | - | Report from Mping. |
| July 2021 | Hail | Washington | - | Received a public report of three quarter inch hail. |
| June 2021 | Hail | Washington | - | Penny size hail was reported. |
| June 2021 | Hail | Washington | - | CBS2 Meteorologist storm chasing reported lots of quarter size hail and few half dollar size. |
| June 2021 | Thunderstorm Wind | Washington | - | A few large limbs blown down, along with the roof blown off a baseball clubhouse. |
| June 2018 | Thunderstorm Wind | Washington | - | Large tree branches blown down. |
| May 2018 | Hail | Washington | - | Received an amateur radio report of nickel sized hail six miles southwest of Washington on Highway 1. |
| May 2018 | Thunderstorm Wind | Washington | - | A delayed report was received from the public of a small tree down. |
| August 2018 | Thunderstorm Wind | Washington | - | A trained spotter reported trees down in the city of Washington. |
| May 2017 | Thunderstorm Wind | Washington | - | The Washington Airport AWOS sensor measured this wind gust. |
| July 2016 | Thunderstorm Wind | Washington | - | The county emergency manager reported some trees were down in the city of Washington. |
| July 2016 | Thunderstorm Wind | Washington | - | The AWOS site at Washington reported a 54 Kt wind gust. |
| July 2014 | Hail | Washington | - | A trained spotter reported dime to possibly nickel sized hail. |
| July 2014 | Hail | Washington | - | A COOP Observer reported dime sized hail. The time of the event was estimated using radar. |
| August 2014 | Thunderstorm Wind | Washington | - | Wind gusts estimated to be 60 mph blew down a two inch diameter tree branch in a neighbor's yard around 1245 am CDT September 1/1145 pm CST August 31. Some loose objects in the area were also blown around during the storm. |
| July 2014 | Hail | Washington | - | The Washington Fire Department reported half inch diameter hail with a few that were quarter sized. Time of the event was estimated using radar. |
| June 2014 | Thunderstorm Wind | Washington | - | Wind gust measured by AWOS. |
| June 2014 | Thunderstorm Wind | Washington | - | Wind gust measured by AWOS. |
| June 2014 | Thunderstorm Wind | Washington | - | Winds were measured by an AWOS station. |
| May 2013 | Thunderstorm Wind | Washington | - | A COOP observer reported 3 inch diameter tree limbs down. |
| June 2013 | Thunderstorm Wind | Washington | - | A trained spotter reported that trees were down in town, corn was blown over, and a small metal outbuilding was destroyed. |
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