| September 2011 | Flood | Hamburg | $3,000,000 | Flooding along the Missouri River gradually improved over the area during September as releases from Gavins Point Dam were reduced. The river at Nebraska City, which reached a record crest of a little over 28 feet by the end of the June, had fallen to around 20.5 feet by the first of September and finally below its 18 foot flood stage during the evening of Sept. 28th. However, extensive flooding of farm fields, roads and highways that had occurred over the summer as levees near Hamburg and Percival failed persisted into September. The flooding caused the closure of 24 miles of Interstate 29 and Highway 2 into Nebraska City as well as other local roads and highways. After the flood waters receded, it was learned that Highway 2 near I29 had several areas of extensive damage, included a sink hole of 15 feet deep. Bridge approaches along I29 were damaged just north of the Missouri border. These roads remained closed in September. |
| June 2010 | Flood | Hamburg | $10,000 | Heavy rain over much of eastern Nebraska and western Iowa during most of June caused a prolonged period of flooding along the Missouri River, especially downstream of Omaha through Rulo. The river near Nebraska City climbed above flood stage early in the afternoon on June 11th and remained above flood stage into July. The river at Nebraska City crested around or a little over 25 feet during the afternoon of June 16th and June 21st. Flood stage is 18 feet. Some roads near the river were flooded along with some cabins, boat ramps and recreation areas. |
| September 2014 | Flood | Hamburg | $5,000 | A slow moving thunderstorm complex lead to heavy rainfall on the 9th causing the West Nishnabotna River to rise above flood stage around the Hamburg area. The river rose above flood stage during the afternoon on the 10th, crested later that morning, and fell below flood stage during the afternoon on the 11th. The flooding was minor and confined to low-lying areas. |
| June 2010 | Flood | Hamburg | $5,000 | Heavy rain prior to and after June 11 caused flooding of the Nishnabotna River in southwest Iowa. The river near Hamburg crested at almost 27 feet around midnight CDT on June 15. Flood stage is 23 feet. The river near Hamburg was above flood stage from the early afternoon of June 11 until the late morning of June 16th. Levees near town protected significant damage, but some agricultural lowlands near the river were flooded as were some other places near town. |
| June 2010 | Flood | Hamburg | $4,000 | Heavy rain on June 22nd and 23rd caused flooding of the Nishnabotna River in southwest Iowa. The river near Hamburg crested at almost 27 feet during the morning of June 24th. Flood stage is 23 feet. The river near Hamburg was above flood stage from the morning of June 22 until the morning of June 25th. Levees near town protected significant damage, but some agricultural lowlands near the river were flooded. |
| June 2010 | Flood | Hamburg | $3,000 | Heavy rain producing thunderstorms that moved into western Iowa on June 27 caused another round of flooding along the Nishnabotna River, especially near Hamburg. The river near Hamburg crested a little over 26 feet in the evening of June 28, flood stage is 23 feet. The river near town was above flood stage from late in the evening of the 27th until the afternoon of the 29th. A federal levee near town protected the area from significant damage, but some agricultural lowlands near the river were flooded. |
| May 2023 | Hail | Hamburg | - | Trained spotter reported 1-inch hail. |
| May 2023 | Thunderstorm Wind | Hamburg | - | Public reported via mPing of 1-inch tree limbs broken; shingles blown off. |
| April 2023 | Hail | Hamburg | - | Trained spotter reported 1-inch hail. |
| April 2023 | Hail | Hamburg | - | Public reported 1.75-inch hail. |
| June 2021 | Thunderstorm Wind | Hamburg | - | Law enforcement reported railcars blown over on Interstate 29. |
| May 2016 | Flood | Hamburg | - | Flooding was observed along both banks of the river. The flooding included agricultural land, as well as a parking lot near the gauge site. |
| September 2015 | Thunderstorm Wind | Hamburg | - | Is there damage reported. |
| December 2015 | Flood | Hamburg | - | Heavy rainfall over a two-day period in mid December brought the Nishnabotna River above flood stage with a crest to just above moderate stage. The crest reached 27.27 feet in the early evening hours of December 15th. This was 2.27 feet above flood stage. The majority of the flooding was confined to areas within the levee system, but State Highway 275 to the southeast of Hamburg did see some water across the road. |
| June 2014 | Thunderstorm Wind | Hamburg | - | Emergency manager reported that several large trees were downed. |
| August 2011 | Thunderstorm Wind | Hamburg | - | Thunderstorm wind gusts were estimated at least 60 mph. The strong winds downed at least 1 tree on the north side of Hamburg and caused some property damage in the area. |
| June 2010 | Flood | Hamburg | - | Rainfall of 2 to 3 inches fell in around 6 hours over much of the central and upper reaches of the Nishnabotna River during the late evening and morning hours of June 4th and 5th. The heavy rain caused the Nishnabotna River to climb about a half of foot above its 23 foot flood stage during the early morning hours of June 6th. Levees along the river protected much of the area from significant damage although some fields were flooded. |
| July 2010 | Flood | Hamburg | - | Rainfall of 2 to 3 inches fell across much of the Nishnabotna River basin for the 48 hour period ending at 7am on July 5. The heavy rain caused another round of flooding along the Nishnabotna River, especially near Hamburg. The river near Hamburg crested a little over 24 feet in the evening of July 5th. Flood stage is 23 feet. The river near town was above flood stage from the afternoon evening of the 5th until the morning of the 6th. A federal levee near town protected the area from significant damage, but minor flooding of agricultural lowlands near the river was noted. |
| August 2009 | Thunderstorm Wind | Hamburg | - | Thunderstorm winds were estimated by the public at around 60 mph east of Hamburg. |
| June 2008 | Flash Flood | Hamburg | - | Three inches of rain in around 1 hour caused flash flooding across a few streets in the Hamburg area. The Willow Slough area near Argyle Street was especially affected. |
| May 2008 | Thunderstorm Wind | Hamburg | - | Thunderstorm wind gusts estimated at around 60 mph downed a few trees and limbs in town. |
| May 2008 | Flood | Hamburg | - | Heavy rainfall during the evening and overnight hours of May 29th and 30th culminated nearly a week of scattered heavy rain producing thunderstorms that occurred over the Nishnabotna River basin. The heavy rains caused the Nishnabotna River to surpass flood stage in the Hamburg area. The river at Hamburg reached a 23.6 foot crest around 7am CDT on May 31st, flood stage is 23 feet. The flooding affected mainly just some agricultural lowlands near town. |
| June 2008 | Flood | Hamburg | - | Heavy rainfall on June 4th over much of southwest Iowa, and subsequent significant rain every few days for the next week or 10 days, pushed the Nishnabotna River out of its banks for a 2 week period beginning around 315 am CDT on June 5 and ending around 815 pm on June 18th. The river at Hamburg reached a 29.3 foot crest at 430 pm on June 14th. Flood stage is 23 feet.||Federal levees protected the town and most area highways from the flood waters as did the placement of up to 50,000 sandbags on the levee's low areas. However, Highway 275 near Hamburg and many county roads were closed for a time due to flood waters, and agricultural lowlands in the region were flooded. In addition, since both the Missouri and Nishnabotna Rivers were in flood, low areas that normally pumped water into those rivers were unable to do so adding to ponding and additional flooding after each rain. |
| April 2007 | Flood | Hamburg | - | Rainfall of 2 to 3 inches on April 24th caused the Nishnabotna River in far southwest Iowa to flood agricultural lowlands. The river at Hamburg reached a 26 foot crest at 9 pm CDT on April 26th. Flood stage is 23 feet. The river at Hamburg was above flood stage from 3 pm on the 25th through 2 pm on the 27th. |
| June 2005 | Thunderstorm Wind | Hamburg | - | Thunderstorm wind gusts estimated at over 60 mph overturned 2 semi-trucks on Interstate 29 near Hamburg. |
| April 2002 | Hail | Hamburg | - | Hail up to nickel size lasted 10 minutes in Hamburg. |
| May 2001 | Thunderstorm Wind | Hamburg | - | Thunderstorm winds estimated at around 60 mph by an off-duty NWS employee downed small tree limbs. |
| April 1999 | Tornado (F0) | Hamburg | - | Brief touchdown. |
| July 1999 | Thunderstorm Wind | Hamburg | - | Large tree limbs downed. |
| May 1998 | Thunderstorm Wind | Hamburg | - | Buildings destroyed. Large trees fell on playground equipment causing severe damage. |
| June 2017 | Hail | Hamburg | - | no account filed |
| March 2017 | Hail | Hamburg | - | no account filed |
| April 2017 | Hail | Hamburg | - | no account filed |
| September 2014 | Hail | Hamburg | - | no account filed |
| June 2014 | Hail | Hamburg | - | no account filed |
| August 2010 | Hail | Hamburg | - | no account filed |
| June 2005 | Hail | Hamburg | - | no account filed |
| August 2004 | Hail | Hamburg | - | no account filed |
| June 2003 | Hail | Hamburg | - | no account filed |
| April 2002 | Hail | Hamburg | - | no account filed |
| August 2002 | Hail | Hamburg | - | no account filed |
| July 1997 | Thunderstorm Wind | Hamburg | - | no account filed |
| June 1996 | Hail | Hamburg | - | no account filed |
| July 1995 | Hail | Hamburg | - | no account filed |
| July 1995 | Thunderstorm Wind | Hamburg | - | no account filed |
| July 1995 | Thunderstorm Wind | Hamburg | - | no account filed |
| July 1995 | Hail | Hamburg | - | no account filed |
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