Oconomowoc, WI
Local storm history & FEMA National Risk Index data
Oconomowoc is rated Relatively Moderate for overall natural hazard risk — near the middle compared to other US counties — based on FEMA's National Risk Index for Waukesha County, WI. The county's highest-rated hazards are cold wave, hail, and tornado.
Storm events near Oconomowoc
NOAA-recorded tornado, hail, and flood events within 25 miles of Oconomowoc's center, 2016–2026 — the only hazards NOAA reports with exact coordinates, so these counts are specific to Oconomowoc itself, not the whole county.
County-wide hazard risk
Every other hazard FEMA and NOAA track — including drought — is only scored at the county level. These are Waukesha County's FEMA National Risk Index scores, covering Oconomowoc along with the rest of the county, not a Oconomowoc-specific figure.
| Hazard | NRI score | Rating |
|---|---|---|
| Wildfire | 49.7 | Very Low |
| Inland Flooding | 89.8 | Relatively Moderate |
| Coastal Flooding | — | Not Applicable |
| Earthquake | 57.4 | Very Low |
| Heat Wave | 90.4 | Relatively Moderate |
| Tornado | 95.7 | Relatively High |
| Avalanche | — | Not Applicable |
| Cold Wave | 97.4 | Relatively High |
| Drought | 31.6 | Relatively Low |
| Hail | 96.1 | Relatively High |
| Hurricane | 9.7 | Very Low |
| Ice Storm | 81.7 | Relatively Moderate |
| Landslide | 62.5 | Relatively Low |
| Lightning | 60.2 | Relatively Moderate |
| Strong Wind | 56.1 | Relatively Moderate |
| Tsunami | — | Not Applicable |
| Volcanic Activity | — | Not Applicable |
| Winter Weather | 86.5 | Relatively High |
Source: FEMA National Risk Index v1.20.0, December 2025. See the methodology page for definitions, or the full Waukesha County risk profile for disaster declarations, social vulnerability, and climate projection data.
Other cities in Waukesha County:
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Frequently asked questions
What natural hazards is Oconomowoc, WI at risk of?
Oconomowoc is rated Relatively Moderate for overall natural hazard risk by FEMA's National Risk Index — near the middle compared to other US counties. The highest-rated hazards for Waukesha County, where Oconomowoc is located, are cold wave, hail, and tornado.
What is Oconomowoc's biggest natural hazard risk?
Cold Wave is the highest-rated hazard for Waukesha County, where Oconomowoc is located, scoring 97.4 out of 100 on FEMA's National Risk Index (rated "Relatively High").
Is Oconomowoc a high-risk area for natural disasters?
Somewhat — Oconomowoc carries near the middle compared to other US counties for overall natural hazard risk, per FEMA's National Risk Index rating of "Relatively Moderate" for Waukesha County.
Has Oconomowoc had tornadoes, hail, or flooding?
NOAA has recorded 25 tornado, 212 hail, 63 inland flooding events within 25 miles of Oconomowoc since 2016.