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St. Augustine, IL
Full City Profile · Illinois · Warren County County
2.7
/5.0
C+
Fair
123
Population
208/sq mi density
$49,375
Median Income
$29,367 per capita
$52,700
Home Value
$88,245 Zillow
49°F
Avg Temperature
275 sunny days/yr
400
Violent Crime/100K
3,282 property/100K
C+
Overall
2.7 / 5.0
Fair overall score based on economy, affordability, safety and education
B+
Economy
3.5 / 5.0
$49,375 median income, 3.7% unemployment
A+
Affordability
5.0 / 5.0
$52,700 home value, /mo rent
F
Safety
1.0 / 5.0
400 violent crimes/100K (5% above avg)
F
Education
1.4 / 5.0
5.4% bachelor's degree or higher
St. Augustine experiences four distinct seasons with an average annual temperature of 49°F (9°C). Winters average 22°F in January while summers reach 73°F in July. The area gets 275 sunny days per year. Annual precipitation totals 37.6 inches. The area receives 24.0 inches of snow annually. Air quality is rated Good with a median AQI of 43.
Temperature
22°F Jan (-6°C)
73°F Jul (23°C)
| Annual Average | 49.4°F |
| 9% below US avg | |
| January Average | 22°F (-6°C) |
| July Average | 73°F (23°C) |
| Sunny Days | 275 days/yr |
Geography
| Elevation | 644 ft (196 m) |
| Area | 0.2 sq mi (0.6 km²) |
| Population Density | 208/sq mi |
| Coordinates | 40.7213°N, 90.4069°W |
| Timezone | America/Chicago |
| County | Warren County County |
| Nearest Airport | General Downing - Peoria International (PIA) 38 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 43.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Very Low |
| Risk Score | 15.5 / 100 |
| Social Vulnerability | 22.8 / 100 |
| Community Resilience | 90.6 / 100 |
Hazard Breakdown
| Tornado | Relatively Low |
| Hurricane | Very Low |
| Earthquake | Very Low |
| Wildfire | Very Low |
| Flood | Very Low |
| Hail | Relatively Low |
| Strong Wind | Relatively Low |
| Heat Wave | Relatively Low |
| Winter Weather | Relatively Low |
| Lightning | Relatively Low |
| Ice Storm | Relatively Low |
| Drought | Relatively Moderate |
| Cold Wave | Relatively Low |
| Landslide | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 22°F (-6°C) | 1.4 in | Coldest |
| February | 28°F (-2°C) | 1.3 in | Driest |
| March | 39°F (4°C) | 2.8 in | |
| April | 51°F (11°C) | 3.8 in | |
| May | 62°F (17°C) | 3.8 in | |
| June | 71°F (22°C) | 4.1 in | |
| July | 73°F (23°C) | 4.4 in | Warmest, Wettest |
| August | 73°F (23°C) | 3.6 in | |
| September | 65°F (19°C) | 3.8 in | |
| October | 54°F (12°C) | 2.9 in | |
| November | 40°F (4°C) | 2.6 in | |
| December | 27°F (-3°C) | 2.2 in |
St. Augustine has a seasonal temperature swing of 51°F / from 22°F in January to 73°F in July. Total annual precipitation is 36.7 inches, with July being the wettest month (4.4") and February the driest (1.3").