Willow Springs, Illinois Weather
Day 93 of summer. Read today’s microseason across nine climate regions →
Willow Springs weather forecast — hour by hour, 7-day outlook, NOAA radar
Conditions updated 9:21 AM CDT · Open-Meteo
- TodaySep 21Overcast14%—63°59°—
- TuesdaySep 22Mostly Clear10%—60°53°-3°
- WednesdaySep 23Overcast——64°57°+4°
- ThursdaySep 24Overcast——71°60°+7°
- FridaySep 25Overcast——64°61°-7°
- SaturdaySep 26Light Drizzle—0.08″62°56°-2°
- SundaySep 27Overcast13%—76°58°+14°
Air quality now AQI 31 · Good
AQI 31 (Good), driven by PM2.5. AQI flat over the last 6 hours (within ±3 points). PM2.5 at 4.8 µg/m³, PM10 at 4.9 µg/m³ — typical background levels with no transport signature.
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion.
What's driving it
PM × Wind × Precip
PM2.5 at 4.8 µg/m³, PM10 at 4.9 µg/m³ — typical background levels with no transport signature.
- PM2.5/PM10
- 0.98
- Wind
- light
- Recent rain
- 0h in last 6h
- Pattern
- background
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).
September dries up ditches or breaks down bridges.
- Moonrise
- 4:29 PM
- Moonset
- 1:06 AM
- In sign
- ♑︎ Capricorn
Willow Springs at a glance
- Today vs. normal: Today averages 61°F (high 63°F, low 59°F), 4°F below the 65°F normal for Sep 21
- Last frost: April 19 (1991–2020 median, NOAA station 3 km away)
- Microseason: Sep 21–25
- Planting calendar: September — plant garlic (overwinter); harvest tomatoes, peppers, beans, summer squash, winter squash
16-Day Forecast — Willow Springs
- Mon63°59°14%
- Tue60°53°10%
- Wed64°57°3%
- Thu71°60°0%
- Fri64°61°0%
- Sat62°56°4%
- Sun76°58°13%
- Mon79°62°10%
- Tue71°65°22%
- Wed73°57°28%
- Thu69°59°12%
- Fri59°53°13%
- Sat79°59°20%
- Sun64°55°16%
- Mon57°47°16%
- Tue61°46°16%
Forecast data from Open-Meteo (CC BY 4.0).
Right now in the garden
Fall planting + final harvests
As of September 21, the season's first frost (typically October 22) is approaching. Pick what frost-tender plants still carry before the next cold front. This city's planting calendar for September: plant garlic (overwinter); harvest tomatoes, peppers, beans, summer squash, and winter squash.
Sun & seasons in Willow Springs
Willow Springs sits in Cook County, where the year’s longest day runs 15h 13m of daylight and its shortest just 9h 9m — a swing of +6h 4m between the June and December solstices. Clocks spring forward on Sunday, March 8, 2026 and fall back on Sunday, November 1, 2026.
Chicago, the state’s largest city, lies about 13 miles to the NE. The nearest town Willow Springs tracks is Chicago, roughly 13 miles to the NE.
Air quality in Willow Springs
Air quality in Willow Springs’s county has trended cleaner since 2020; its cleanest year on record was 2025 (median AQI 53).
Planting calendar
| Month | Plant | Harvest |
|---|---|---|
| March | lettuce, peas, spinach, radishes | — |
| April | lettuce, peas, spinach, radishes | radishes |
| May | tomatoes, peppers, beans, squash | lettuce, peas, spinach, radishes |
| June | tomatoes, peppers, beans, squash | lettuce, peas, spinach, radishes |
| July | tomatoes, peppers, beans, squash | tomatoes, peppers, beans, summer squash, garlic |
| August | beans, squash, fall brassicas, carrots | tomatoes, peppers, beans, summer squash, winter squash |
| September | garlic (overwinter) | tomatoes, peppers, beans, summer squash, winter squash |
| October | garlic (overwinter) | tomatoes, peppers, beans, summer squash, winter squash, fall brassicas, carrots |
| November | — | fall brassicas, carrots |
A year in weather
Willow Springs peaks at about 77°F in July and bottoms near 24°F in January; May brings the heaviest rain (5.0 inches) and February the least (2.0 inches).
| Month | Mean temp | Precip | Rainy days |
|---|---|---|---|
| January | 24° | 2.3″ | 10 |
| February | 27° | 2.0″ | 8 |
| March | 38° | 2.5″ | 10 |
| April | 51° | 4.1″ | 12 |
| May | 62° | 5.0″ | 13 |
| June | 72° | 4.7″ | 13 |
| July | 77° | 4.1″ | 10 |
| August | 75° | 4.5″ | 11 |
| September | 67° | 3.5″ | 9 |
| October | 54° | 3.7″ | 10 |
| November | 41° | 2.7″ | 9 |
| December | 30° | 2.4″ | 10 |
Regional context
Similar climates Burr Ridge, IL, Indian Head Park, IL, Hodgkins, IL
Per NOAA NCEI 1991-2020 normals, Willow Springs runs from a 24°F January mean to 77°F in July, a 53°F seasonal spread, with near 41.4 inches of precipitation across about 125 wet days.
Willow Springs's rain peaks in summer: May brings 5.0 inches over 13.4 thunderstorm-fed days, while February sees just 2.0 inches across 8.2 days under cooler, drier air. That puts Willow Springs in a summer-convective cohort with places like Burr Ridge, IL, Indian Head Park, IL and Hodgkins, IL.
Once Willow Springs passes April 19, freezes fade and Willow Springs's beds take kale, peas, spinach, and parsnips. Tomatoes and peppers do best set out two weeks later in Willow Springs, once nights clear the mid-40s°F. The season ends by October 22 in Willow Springs, once hard frosts set back in. Open lawns in Willow Springs whiten first when frost returns.
Similar climates: Burr Ridge, IL, Indian Head Park, IL, Hodgkins, IL, Countryside, IL, Justice, IL.
Frequently asked
- When does it freeze in Willow Springs?
- In Willow Springs, expect the last spring frost near April 19; Willow Springs's first autumn frost comes around October 22.
- What is the rainy season in Willow Springs?
- Rainfall in Willow Springs peaks in May near 5.0 inches, out of about 41 inches annually.
- What is the warmest month in Willow Springs?
- Willow Springs peaks in July, when the mean runs near 77°F.
- What is the coldest month in Willow Springs?
- January is Willow Springs's coldest month, averaging about 24°F.
- When can I start a vegetable garden in Willow Springs?
- In Willow Springs, sow peas and hardy greens around April 19; Willow Springs's tomatoes and peppers wait two weeks more.
- How many rainy days does Willow Springs get?
- Willow Springs records around 125 days of measurable precipitation annually.
- What hardiness zone is Willow Springs?
- With January around 24°F, Willow Springs's zone reflects that minimum — the USDA ZIP map confirms Willow Springs's band.
- What is the 10-day forecast for Willow Springs?
- Willow Springs's extended outlook — daily high and low temperatures and precipitation chances for each upcoming day — is in the daily forecast above.
- Will it rain this week in Willow Springs?
- See this week's day-by-day rain chances for Willow Springs in the daily forecast above, and the next 24 hours in the hourly chart.
- What is the weather like right now in Willow Springs?
- Current conditions for Willow Springs and the next 24 hours — temperature, precipitation chance, and wind by the hour — are in the hourly forecast chart above.
- How often is the Willow Springs forecast updated?
- The Willow Springs forecast on this page is built from Open-Meteo weather-model data and refreshes regularly through the day.
- When are sunrise and sunset in Willow Springs?
- Today's sunrise and sunset times for Willow Springs are in the Almanac section above, along with civil dawn, civil dusk, and day length. Day length is longest near the summer solstice and shortest near the winter solstice.
- How accurate is the weather forecast for Willow Springs?
- The next few days in Willow Springs's forecast are the most reliable; accuracy declines beyond about a week as weather-model uncertainty grows.
Willow Springs sits at 41.7°N; its climate zone is warm-summer humid continental (Köppen approximation).
ZIP codes in Willow Springs
- 60439
- 60480