Peoria, Illinois Weather
Fireflies pulse through the magnolias. Day 76 of spring. Read this microseason across nine climate regions →
Peoria weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 3Overcast——84°55°—
- ThursdayJun 4Overcast——86°60°+2°
- FridayJun 5Heavy Drizzle56%—82°67°-4°
- SaturdayJun 6Showers56%—82°67°0°
- SundayJun 7Drizzle33%—85°66°+3°
- MondayJun 8Showers44%0.12″78°69°-7°
- TuesdayJun 9Drizzle31%—77°70°-1°
Ozone at AQI 68. AQI flat over the last 6 hours (within ±3 points). Overcast through the UV peak window (cloud cover ~100%) — afternoon ozone should stay flat.
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion.
What's driving it
Ozone × UV × Sky
Ozone at AQI 68. Overcast through the UV peak window (cloud cover ~100%) — afternoon ozone should stay flat.
- Present
- AQI 68
- UV peak
- 8.6 at 1 PM
- Sky at peak
- overcast
- Projected peak
- AQI 39
PM × Wind × Precip
PM2.5 at 7.2 µg/m³ (AQI 40) with a 0.80 fine-to-coarse ratio and 6 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.80
- Wind
- light
- Recent rain
- 0h in last 6h
- Pattern
- stagnant smoke
Trends
Seven days of AQI and PM2.5.
Hourly air-quality data from the Copernicus Atmosphere Monitoring Service, charted across the past and next several days. Dashed lines mark the AQI breakpoints at 50 (Good → Moderate) and 100 (Moderate → Unhealthy for Sensitive Groups).
The higher the clouds, the finer the weather.
- Moonrise
- 3:53 AM
- Moonset
- 12:55 PM
- In sign
- ♑︎ Capricorn
Fireflies pulse through the magnolias
Peoria at a glance
- Today vs. normal: 8°F above the seasonal normal for this latitude
- Last frost: April 21 (climatological average for this latitude)
- Microseason: Jun 1–5
- Planting window: Harvest spring lettuce before it bolts. Sow heat-tolerant greens.
Right now in the garden
Peak growing season
As of June 3, the growing season is at its peak — frost is months away. Continue succession-planting beans and summer squash. Start fall brassicas (broccoli, cabbage, kale) from seed indoors for transplanting in late summer.
SPC Convective Outlook
Storm Prediction Center — Peoria
SPC has placed Peoria in the General Thunderstorms category for severe thunderstorms day after tomorrow.
- TODAYNONENo severe risk
- TOMORROWNONENo severe risk
- DAY 3TSTMGeneral Thunderstorms
Thunderstorms possible. Not severe, but capable of producing lightning and brief heavy rain.
Source: NOAA / NWS Storm Prediction Center categorical convective outlook. Outlooks are re-issued multiple times per day; this page reflects the most recent SPC polygons covering the city’s coordinates.
Planting calendar
| Month | Plant | Harvest |
|---|---|---|
| January | — | — |
| February | — | — |
| March | — | — |
| April | lettuce, peas, spinach, radishes | — |
| May | lettuce, peas, spinach, radishes, tomatoes, peppers, beans, squash | lettuce, peas, radishes |
| June | tomatoes, peppers, beans, squash | lettuce, peas, radishes |
| July | tomatoes, peppers, beans, squash | tomatoes, beans, summer squash |
| August | — | tomatoes, beans, summer squash |
| September | fall brassicas, garlic (overwinter), carrots | tomatoes, beans, summer squash |
| October | fall brassicas, garlic (overwinter), carrots | winter squash, tomatoes (last) |
| November | — | — |
| December | — | — |
A year in weather
July brings Peoria's warmest temperatures at roughly 76°F mean, while January delivers the coldest at around 26°F. May sees peak rainfall with 4.7 inches, contrasting with February's dry spell of just 2.0 inches.
| Month | Mean temp | Precip | Rainy days |
|---|---|---|---|
| January | 26° | 2.1″ | 5 |
| February | 30° | 2.0″ | 5 |
| March | 41° | 2.7″ | 6 |
| April | 53° | 4.0″ | 8 |
| May | 64° | 4.7″ | 8 |
| June | 73° | 3.7″ | 7 |
| July | 76° | 3.5″ | 5 |
| August | 75° | 3.3″ | 6 |
| September | 67° | 3.5″ | 5 |
| October | 55° | 3.2″ | 6 |
| November | 42° | 2.7″ | 6 |
| December | 31° | 2.2″ | 5 |
Regional context
Peoria belongs to the humid subtropical climate region, sharing temperature ranges, seasonal patterns, and growing conditions with neighboring cities throughout this zone.
Similar climates: Springfield, IL, Champaign, IL, Bloomington, IL, Alton, IL, Decatur, IL.
Naturalist notes
Late April often brings the first waves of migrating warblers through Peoria's parks and woodlands.
Red oak leaves typically begin their spring emergence in early May as soil temperatures warm consistently.
Frequently asked
- When does it freeze in Peoria?
- Spring's last frost typically occurs around mid-April in Peoria, while the first fall frost returns around mid-November.
- What is the rainy season in Peoria?
- May stands as the wettest month, averaging about 4.7 inches of rain, while the city receives roughly 38 inches annually.
- What is the warmest month in Peoria?
- July typically records the warmest temperatures, averaging about 76°F.
- What is the coldest month in Peoria?
- January typically brings the coldest weather, averaging about 26°F.
- When can I start a vegetable garden in Peoria?
- Cool-season crops like peas and lettuce can be planted around the last spring frost in mid-April, while warm-season crops such as tomatoes and peppers should wait until 1–2 weeks after.
- How many rainy days does Peoria get?
- Peoria averages about 71 rainy days per year.
- What hardiness zone is Peoria?
- Peoria's USDA hardiness zone reflects its lowest average winter temperature; the USDA's online lookup tool using the city ZIP provides the current zone designation.
Climate
Peoria, Illinois experiences a humid subtropical climate zone. Temperatures hover near 26°F in January while July averages 76°F — creating a 51°F seasonal swing.
Annual precipitation totals about 38 inches across roughly 71 rainy days throughout the year.
Weather patterns here respond to the city's latitude at 40.8°N, its proximity to large water bodies, and local elevation. These factors determine growing seasons, frost timing, and daily weather conditions.