Cahokia Heights, IL
Full City Profile · Illinois · St. Louis city County
2.9
/5.0
C+
Fair
17,173
Population
1,088/sq mi density
$37,975
Median Income
$19,692 per capita
$56,900
Home Value
$49,811 Zillow
$959
Median Rent
37.6% income on rent
57°F
Avg Temperature
C+
Overall
2.9 / 5.0
Fair overall score based on economy, affordability, safety and education
D
Economy
1.6 / 5.0
$37,975 median income, 9.3% unemployment
A+
Affordability
5.0 / 5.0
$56,900 home value, $959/mo rent
D
Education
2.0 / 5.0
11.9% bachelor's degree or higher
Cahokia Heights enjoys a temperate climate with an average annual temperature of 57°F (14°C). Winters average 32°F in January while summers reach 79°F in July. Annual precipitation totals 40.8 inches. The area receives 13.8 inches of snow annually.
Temperature
32°F Jan (0°C)
79°F Jul (26°C)
| Annual Average | 56.5°F |
| 5% above US avg | |
| January Average | 32°F (0°C) |
| July Average | 79°F (26°C) |
Geography
| Elevation | 406 ft (124 m) |
| Area | 15.8 sq mi (40.9 km²) |
| Population Density | 1,088/sq mi |
| Coordinates | 38.5721°N, 90.1553°W |
| Timezone | America/Chicago |
| County | St. Louis city County |
| Nearest Airport | St Louis Lambert International (STL) 17 miles away |
Precipitation & Snow
Air Quality
Air Pollutants (EPA 2023)
| Ozone (O₃) | 0.0419 ppm |
| NO₂ (Nitrogen Dioxide) | 15.1 ppb |
| SO₂ (Sulfur Dioxide) | 1.03 ppb |
| CO (Carbon Monoxide) | 0.28 ppm |
| PM2.5 (Fine Particles) | 10.1 μg/m³ |
Natural Hazard Risk
| Overall Risk | Relatively High |
| Risk Score | 98.7 / 100 |
| Social Vulnerability | 71.9 / 100 |
| Community Resilience | 61.0 / 100 |
Hazard Breakdown
| Tornado | Very High |
| Hurricane | Very Low |
| Earthquake | Relatively High |
| Wildfire | Very Low |
| Flood | Relatively High |
| Hail | Relatively Moderate |
| Strong Wind | Relatively High |
| Heat Wave | Very High |
| Winter Weather | Relatively Moderate |
| Lightning | Relatively High |
| Ice Storm | Relatively High |
| Drought | No Rating |
| Cold Wave | Relatively Moderate |
| Landslide | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 32°F (0°C) | 2.5 in | Coldest |
| February | 37°F (3°C) | 2.0 in | Driest |
| March | 46°F (8°C) | 3.3 in | |
| April | 57°F (14°C) | 4.5 in | |
| May | 67°F (19°C) | 4.8 in | Wettest |
| June | 75°F (24°C) | 4.4 in | |
| July | 79°F (26°C) | 3.7 in | Warmest |
| August | 77°F (25°C) | 3.7 in | |
| September | 69°F (21°C) | 3.4 in | |
| October | 58°F (14°C) | 3.1 in | |
| November | 46°F (8°C) | 3.3 in | |
| December | 36°F (2°C) | 2.3 in |
Cahokia Heights has a seasonal temperature swing of 47°F / from 32°F in January to 79°F in July. Total annual precipitation is 40.8 inches, with May being the wettest month (4.8") and February the driest (2.0").