Heat Wave Risk in Michigan
All Michigan counties ranked by FEMA National Risk Index heat wave score
Heat Wave risk — prolonged periods of extreme heat that threaten health and infrastructure — is rated for 83 of 83 Michigan counties in FEMA's National Risk Index. Wayne County carries the state's highest heat wave score at 99.3, with $32M in expected annual heat wave losses.
2 Michigan counties are rated High or Very High for heat wave, and expected annual losses from heat wave total roughly $81M statewide. The full ranking below links to each county's complete 18-hazard risk profile.
County Rankings — Heat Wave
| # | County | Heat Wave Score | Rating | Ann. Freq. | Ann. Loss |
|---|---|---|---|---|---|
| 1 | Wayne County | High | 4.32 / yr | $32M | |
| 2 | Oakland County | High | 4.21 / yr | $13M | |
| 3 | Kent County | Medium | 2.47 / yr | $8M | |
| 4 | Macomb County | Medium | 4.21 / yr | $6M | |
| 5 | Washtenaw County | Medium | 3.68 / yr | $3M | |
| 6 | Genesee County | Medium | 2.63 / yr | $2M | |
| 7 | Saginaw County | Low | 2.26 / yr | $1M | |
| 8 | Monroe County | Low | 3.79 / yr | $1M | |
| 9 | Ingham County | Low | 2.63 / yr | $1M | |
| 10 | Berrien County | Low | 3.53 / yr | $723K | |
| 11 | Livingston County | Low | 3.37 / yr | $1M | |
| 12 | St. Clair County | Low | 2.37 / yr | $733K | |
| 13 | Ottawa County | Low | 2.31 / yr | $939K | |
| 14 | Muskegon County | Low | 1.79 / yr | $636K | |
| 15 | Jackson County | Low | 2.63 / yr | $553K | |
| 16 | Kalamazoo County | Low | 2.68 / yr | $619K | |
| 17 | Shiawassee County | Low | 2.47 / yr | $475K | |
| 18 | Lenawee County | Low | 3.58 / yr | $509K | |
| 19 | Bay County | Low | 2.16 / yr | $435K | |
| 20 | Midland County | Low | 2.16 / yr | $434K | |
| 21 | Calhoun County | Low | 2.68 / yr | $398K | |
| 22 | Lapeer County | Low | 2.47 / yr | $362K | |
| 23 | Sanilac County | Low | 1.95 / yr | $240K | |
| 24 | Allegan County | Low | 2.68 / yr | $339K | |
| 25 | Eaton County | Low | 2.63 / yr | $328K | |
| 26 | Van Buren County | Low | 2.68 / yr | $267K | |
| 27 | Tuscola County | Low | 2.05 / yr | $240K | |
| 28 | Cass County | Low | 3.58 / yr | $231K | |
| 29 | Huron County | Low | 1.95 / yr | $218K | |
| 30 | Hillsdale County | Low | 3.53 / yr | $181K | |
| 31 | Isabella County | Very Low | 1.79 / yr | $183K | |
| 32 | Branch County | Very Low | 3.47 / yr | $165K | |
| 33 | Mason County | Very Low | 1.47 / yr | $131K | |
| 34 | St. Joseph County | Very Low | 3.47 / yr | $156K | |
| 35 | Grand Traverse County | Very Low | 0.74 / yr | $204K | |
| 36 | Newaygo County | Very Low | 1.84 / yr | $143K | |
| 37 | Barry County | Very Low | 2.68 / yr | $181K | |
| 38 | Montcalm County | Very Low | 1.95 / yr | $154K | |
| 39 | Ionia County | Very Low | 2.21 / yr | $157K | |
| 40 | Gratiot County | Very Low | 1.89 / yr | $137K | |
| 41 | Oceana County | Very Low | 1.68 / yr | $130K | |
| 42 | Clinton County | Very Low | 2.16 / yr | $215K | |
| 43 | Mecosta County | Very Low | 1.84 / yr | $105K | |
| 44 | Clare County | Very Low | 1.53 / yr | $66K | |
| 45 | Wexford County | Very Low | 0.84 / yr | $85K | |
| 46 | Alpena County | Very Low | 0.84 / yr | $70K | |
| 47 | Manistee County | Very Low | 0.84 / yr | $68K | |
| 48 | Marquette County | Very Low | 0.37 / yr | $71K | |
| 49 | Lake County | Very Low | 1.53 / yr | $47K | |
| 50 | Cheboygan County | Very Low | 0.68 / yr | $51K | |
| 51 | Emmet County | Very Low | 0.69 / yr | $68K | |
| 52 | Osceola County | Very Low | 1.53 / yr | $49K | |
| 53 | Iosco County | Very Low | 1.00 / yr | $43K | |
| 54 | Gladwin County | Very Low | 1.00 / yr | $39K | |
| 55 | Roscommon County | Very Low | 0.95 / yr | $36K | |
| 56 | Charlevoix County | Very Low | 0.65 / yr | $51K | |
| 57 | Otsego County | Very Low | 0.74 / yr | $54K | |
| 58 | Leelanau County | Very Low | 0.74 / yr | $48K | |
| 59 | Ogemaw County | Very Low | 1.00 / yr | $33K | |
| 60 | Antrim County | Very Low | 0.74 / yr | $50K | |
| 61 | Kalkaska County | Very Low | 0.74 / yr | $38K | |
| 62 | Benzie County | Very Low | 0.74 / yr | $39K | |
| 63 | Presque Isle County | Very Low | 0.68 / yr | $26K | |
| 64 | Menominee County | Very Low | 0.37 / yr | $28K | |
| 65 | Arenac County | Very Low | 1.00 / yr | $25K | |
| 66 | Montmorency County | Very Low | 0.74 / yr | $20K | |
| 67 | Dickinson County | Very Low | 0.37 / yr | $29K | |
| 68 | Delta County | Very Low | 0.21 / yr | $24K | |
| 69 | Alcona County | Very Low | 0.84 / yr | $16K | |
| 70 | Gogebic County | Very Low | 0.32 / yr | $15K | |
| 71 | Missaukee County | Very Low | 0.84 / yr | $21K | |
| 72 | Crawford County | Very Low | 0.74 / yr | $16K | |
| 73 | Houghton County | Very Low | 0.25 / yr | $25K | |
| 74 | Oscoda County | Very Low | 0.84 / yr | $12K | |
| 75 | Iron County | Very Low | 0.37 / yr | $13K | |
| 76 | Chippewa County | Very Low | 0.11 / yr | $11K | |
| 77 | Baraga County | Very Low | 0.37 / yr | $9K | |
| 78 | Ontonagon County | Very Low | 0.32 / yr | $6K | |
| 79 | Alger County | Very Low | 0.16 / yr | $4K | |
| 80 | Mackinac County | Very Low | 0.11 / yr | $3K | |
| 81 | Luce County | Very Low | 0.11 / yr | $2K | |
| 82 | Schoolcraft County | Very Low | 0.08 / yr | $1K | |
| 83 | Keweenaw County | Very Low | 0.16 / yr | $935 |
83 Michigan counties with measurable heat wave risk. See the national heat wave ranking or all Michigan counties by overall risk.
Frequently Asked Questions
Which Michigan county has the highest heat wave risk?
Wayne County has the highest FEMA heat wave risk score in Michigan at 99.3 (High), with $32M in expected annual losses and about 4.32 events per year.
How many Michigan counties face significant heat wave risk?
83 Michigan counties record measurable heat wave risk in FEMA's National Risk Index; 2 of them are rated High or Very High.