| June 2018 | Flash Flood | Oak Harbor | $1,250,000 | Three rounds of torrential rain moved across Ottawa County on the evening of June 12th between 8 pm and midnight. The heaviest rain occurred around 1030 pm with rainfall rates estimated at over 5 inches per hour lasting for 45 minutes. Unofficial rain gauges in the area reported storm total rainfall amounts of 5 to 6 inches between Oak Harbor and Port Clinton, with one cocorahs station reporting 5.50 inches over Port Clinton. A rain gauge in Catawba Island reported as much as 8 inches, though this cannot be verified. Though a lakeside and relatively flat terrain the area is flood prone. Flooding was notable in this event due the intensity of the rainfall which overwhelmed storm drainage systems. The Portage River, which flows through Ottawa County to its mouth at Sandusky Bay, was elevated but did not flood. Lake Erie, another source for storm water output, was elevated at the time of the rainfall contributing to poor storm drainage. |Local officials declared a State of Emergency for Port Clinton and Oak Harbor due to extensive flooding. The primary impacts were widespread basement flooding and road closures. Hardest hit in Port Clinton were Madison, Lee, Taft, and Columbia Streets. Flood waters reached the front doors of many homes as neighborhood storm drains were overwhelmed. At least one basement wall collapsed. Following a CERT survey, there were at least 6 homes with major damage, 51 with minor damage, and 134 affected. The area hospital flooded with 2-3 inches in the lobby, gift shop, and radiology department, along with the south parking lot. In Port Clinton alone up to 35 roads were either closed or had reports of high water between 2 and 3 feet deep. In Oak Harbor Ohio 19 between Ohio 163 and Ottawa Street was flooded. The primary impacts in Oak Harbor was flooded basements. Total damages estimated around $1.25 M. |
| June 2020 | Thunderstorm Wind | Oak Harbor | $150,000 | Ottawa County Emergency Management, Sheriff Dispatch, and several trained spotters reported widespread wind damage across Ottawa County. Tree damage and downed power poles and lines were reported in Oak Harbor, Port Clinton, Catawba Island, and Marblehead in the mainland portions of the county. Several of the downed trees were quite large, as much as three and a half feet in diameter, and several were reported to be snapped. Outside of a few trees falling onto structures, some homes reported wind damage with a roof removed from a garage and others having miscellaneous roof and shingle damage. An automated wind sensor at Carl R Keller Field reported a 60 mph wind gust during the event. Power outages in the area lasted several days. |
| August 2010 | Thunderstorm Wind | Oak Harbor | $70,000 | Thunderstorm winds uprooted a tree measuring four feet in diameter and 70 feet in height. The tree fell onto a house and caused moderate damage. |
| August 2010 | Thunderstorm Wind | Oak Harbor | $50,000 | Thunderstorm winds downed numerous large trees and power lines. Two trees measuring four feet in diameter and thirty feet tall were uprooted. A vehicle was damaged by one of the trees. |
| July 1998 | Thunderstorm Wind | Oak Harbor | $50,000 | A barn and trees were downed in Salem Township, south of Oak Harbor. |
| June 2025 | Tornado (EF0) | Oak Harbor | $49,000 | An EF0 tornado with estimated peak winds of 70-mph impacted the Rocky Ridge area and moved east-northeastward during its lifespan. This tornado began west of Toussaint Portage Road and produced minor tree damage, including one tree downed onto a house. Another home on Toussaint Portage Road sustained minor roof and facade damage, and had a window shattered. As the tornado continued to move east-northeastward, it downed additional tree branches along Genzman Road and then removed a portion of a small barn's roof before the tornado dissipated. |
| July 2011 | Thunderstorm Wind | Oak Harbor | $40,000 | Thunderstorm winds downed a large tree and several limbs at the Ottawa County Fairgrounds. Some tents at the fair were also blown down. A couple concession trailers were damaged as well. |
| August 2022 | Thunderstorm Wind | Oak Harbor | $20,000 | Multiple trees and power poles downed, and a shed was damaged in Oak Harbor. |
| March 2017 | Thunderstorm Wind | Oak Harbor | $15,000 | Thunderstorm winds downed a utility pole near State Route 19. |
| August 2010 | Thunderstorm Wind | Oak Harbor | $15,000 | Thunderstorm winds downed several large limbs. A railroad crossing bar was also snapped off by the high winds. |
| August 2010 | Thunderstorm Wind | Oak Harbor | $15,000 | Thunderstorm winds toppled a utility pole and a large tree. |
| June 2008 | Thunderstorm Wind | Oak Harbor | $15,000 | Utility poles and wires were reported down. |
| April 2003 | Thunderstorm Wind | Oak Harbor | $15,000 | Thunderstorm winds damaged a house near Oak Harbor. |
| August 2013 | Thunderstorm Wind | Oak Harbor | $10,000 | Law enforcement relayed a report of a large tree down on a road near Oak Harbor. A trained spotter reported a large 3 to 4 foot diameter tree down northeast of Genoa. A trained spotter also reported numerous 10-15 inch diameter tree limbs down in Elmore. |
| May 2019 | Thunderstorm Wind | Oak Harbor | $5,000 | Several power poles were blown down and a couple leaning along Benton-Carrol Road. |
| July 2016 | Thunderstorm Wind | Oak Harbor | $5,000 | Thunderstorm winds downed several large tree limbs across the city. |
| July 2011 | Thunderstorm Wind | Oak Harbor | $5,000 | Thunderstorm winds downed a few power poles in the area. |
| August 2002 | Thunderstorm Wind | Oak Harbor | $5,000 | Thunderstorm winds downed several large tree limbs. |
| July 2007 | Thunderstorm Wind | Oak Harbor | $3,000 | Several large limbs were reported down. |
| November 2014 | Thunderstorm Wind | Oak Harbor | $2,000 | Thunderstorm winds downed a few large tree limbs. |
| May 2010 | Thunderstorm Wind | Oak Harbor | $2,000 | Thunderstorm winds downed a large tree. |
| June 2009 | Thunderstorm Wind | Oak Harbor | $2,000 | Several large limbs were reported down. |
| June 2008 | Thunderstorm Wind | Oak Harbor | $2,000 | Several large limbs were reported down. |
| August 1995 | Thunderstorm Wind | Oak Harbor | $2,000 | Large limbs were downed. |
| May 2018 | Thunderstorm Wind | Oak Harbor | $1,000 | Thunderstorm wind gusts toppled a large pine tree west of Oak Harbor. |
| March 2011 | Hail | Oak Harbor | $1,000 | Pea sized hail was reported with this storm. |
| August 2010 | Thunderstorm Wind | Oak Harbor | $1,000 | A thunderstorm wind gust of 61 mph was measured. Thunderstorm winds downed small tree limbs at the time of the measured gust. |
| June 1998 | Thunderstorm Wind | Oak Harbor | $500 | A tree and a telephone pole were downed. |
| June 2023 | Hail | Oak Harbor | - | Hail up to quarter-size in Oak Harbor. |
| August 2021 | Thunderstorm Wind | Oak Harbor | - | Roof damage to home in Oak Harbor. Numerous shingles were torn off. |
| May 2020 | Thunderstorm Wind | Oak Harbor | - | A couple trees down and partially blocking roads in the Oak Harbor area. Time estimated via radar. |
| June 2019 | Flood | Oak Harbor | - | Storms with heavy rain moved into Ottawa County in the afternoon of June 5. Heavy thunderstorms moved into the area around 3 PM lasting for over an hour. By 4 PM over 2 inches of rain had fallen triggering flash flooding in the Oak Harbor area. Waters 3 inches above dump truck door. Oak Harbor on SR19 & Main. Storm drainage was less efficient than normal due to high lake levels at the time, exasperating flood impacts. |
| August 2019 | Thunderstorm Wind | Oak Harbor | - | There was a tree down near the intersection of Behlman and West Fick Roads. |
| December 2019 | Hail | Oak Harbor | - | Pea to nickel-size hail fell for about five minutes. |
| June 2015 | Hail | Oak Harbor | - | Penny sized hail was observed. |
| May 2015 | Thunderstorm Wind | Oak Harbor | - | Thunderstorm wind gusts were estimated to be at least 60 mph. |
| August 2013 | Hail | Oak Harbor | - | A trained weather spotter reported penny size hail and numerous power outages. |
| March 2012 | Hail | Oak Harbor | - | Nickel sized hail was observed. |
| March 2012 | Hail | Oak Harbor | - | Quarter sized hail was observed. |
| March 2012 | Hail | Oak Harbor | - | Nickel sized hail was observed. |
| June 2012 | Thunderstorm Wind | Oak Harbor | - | Thunderstorm winds downed a few large tree limbs. |
| August 2012 | Thunderstorm Wind | Oak Harbor | - | Trained spotter estimated a 60 mph wind. |
| July 2012 | Hail | Oak Harbor | - | Quarter sized hail was observed. |
| July 2012 | Hail | Oak Harbor | - | Nickel sized hail was observed. |
| July 2012 | Hail | Oak Harbor | - | Quarter to half dollar sized hail was observed. |
| August 2011 | Hail | Oak Harbor | - | Penny sized hail was observed. |
| May 2011 | Thunderstorm Wind | Oak Harbor | - | Thunderstorms produced an estimated wind gust of 65mph. |
| September 2011 | Flood | Oak Harbor | - | An official NWS observer reported 2.3 of rain in Oak Harbor in a matter of a few hours. This rainfall over already saturated ground resulted in widespread minor flooding. Several roads in downtown Oak Harbor were flooded with high water up to a foot deep. |
| May 2010 | Hail | Oak Harbor | - | Nickel to quarter size hail was observed. |
| July 2009 | Hail | Oak Harbor | - | Penny size hail was observed. |
| June 2008 | Hail | Oak Harbor | - | Penny size hail was observed. |
| February 2008 | Hail | Oak Harbor | - | Penny size hail was observed. |
| June 2008 | Thunderstorm Wind | Oak Harbor | - | A trained spotter estimated thunderstorm wind gusts to be 60 mph. No damage was immediately noted during the wind gusts. |
| March 2007 | Hail | Oak Harbor | - | Nickel size hail was observed. |
| May 2007 | Hail | Oak Harbor | - | Penny size hail was observed. |
| June 2006 | Hail | Oak Harbor | - | Penny size hail was observed. |
| June 2006 | Hail | Oak Harbor | - | Penny size hail was observed. |
| May 2006 | Hail | Oak Harbor | - | Penny size hail was observed. |
| June 2006 | Hail | Oak Harbor | - | Penny size hail was observed. |
| May 2005 | Hail | Oak Harbor | - | Quarter size hail was observed. |