Bloomington, Illinois Weather
Thunder quiets the land. Day 93 of summer. Read this microseason across nine climate regions →
Bloomington weather forecast — hour by hour, 7-day outlook, NOAA radar
Conditions updated 9:20 AM CDT · Open-Meteo
- TodaySep 21Light Drizzle later—0.04″64°60°—
- TuesdaySep 22Overcast——63°55°-1°
- WednesdaySep 23Overcast——67°54°+4°
- ThursdaySep 24Overcast——68°52°+1°
- FridaySep 25Overcast——69°60°+1°
- SaturdaySep 26Light Drizzle—0.01″61°58°-8°
- SundaySep 27Drizzle12%—78°58°+17°
Air quality now AQI 25 · Good
AQI 25 (Good), driven by Ozone. AQI flat over the last 6 hours (within ±3 points).
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion.
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
- 4:30 PM
- Moonset
- 1:15 AM
- In sign
- ♑︎ Capricorn
Thunder quiets the land
Read this microseason across nine climate regions →
All 72 microseasons on the year wheel →
Bloomington at a glance
- Today vs. normal: Today averages 62°F (high 64°F, low 60°F), about the 63°F normal for Sep 21
- Last frost: April 25 (1991–2020 median, NOAA station 8 km away)
- Microseason: Sep 21–25
- Planting calendar: September — plant garlic (overwinter); harvest tomatoes, peppers, beans, summer squash, winter squash
16-Day Forecast — Bloomington
- Mon64°60°8%
- Tue63°55°7%
- Wed67°54°1%
- Thu68°52°0%
- Fri69°60°1%
- Sat61°58°5%
- Sun78°58°12%
- Mon79°65°13%
- Tue72°64°27%
- Wed73°54°21%
- Thu76°56°10%
- Fri64°57°16%
- Sat83°63°23%
- Sun63°48°17%
- Mon57°42°17%
- Tue59°40°23%
Forecast data from Open-Meteo (CC BY 4.0).
Live wind & temperature near Bloomington
Interactive wind and temperature map centered on Bloomington — it loads in your browser. Open the full weather map.
Right now in the garden
Fall planting + final harvests
As of September 21, the season's first frost (typically October 16) 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 Bloomington
Bloomington sits in McLean County, where the year’s longest day runs 15h 4m of daylight and its shortest just 9h 17m — a swing of +5h 48m 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 115 miles to the NE. The nearest town Bloomington tracks is Peoria, roughly 39 miles to the WNW.
Air quality in Bloomington
Air quality in Bloomington’s county has held roughly steady since 2020; its cleanest year on record was 2024 (median AQI 44). See the full air-quality history for Bloomington.
Planting calendar
| Month | Plant | Harvest |
|---|---|---|
| April | lettuce, peas, spinach, radishes | radishes |
| May | lettuce, peas, spinach, radishes, tomatoes, peppers, beans, squash | lettuce, spinach, radishes |
| June | tomatoes, peppers, beans, squash | lettuce, peas, spinach, radishes |
| July | tomatoes, peppers, beans, squash, fall brassicas, carrots | lettuce, peas, spinach, tomatoes, peppers, beans, summer squash, garlic |
| August | beans, squash, fall brassicas, carrots | tomatoes, peppers, beans, summer squash, winter squash, garlic |
| September | garlic (overwinter) | tomatoes, peppers, beans, summer squash, winter squash |
| October | — | tomatoes, peppers, beans, summer squash, winter squash, fall brassicas, carrots |
| November | — | fall brassicas, carrots |
A year in weather
Bloomington peaks at about 75°F in July and bottoms near 25°F in January; May brings the heaviest rain (4.8 inches) and February the least (2.0 inches).
| Month | Mean temp | Precip | Rainy days |
|---|---|---|---|
| January | 25° | 2.4″ | 9 |
| February | 29° | 2.0″ | 8 |
| March | 39° | 2.6″ | 10 |
| April | 50° | 3.7″ | 12 |
| May | 62° | 4.8″ | 12 |
| June | 72° | 4.1″ | 11 |
| July | 75° | 4.1″ | 8 |
| August | 73° | 3.8″ | 9 |
| September | 66° | 3.2″ | 8 |
| October | 54° | 3.5″ | 9 |
| November | 41° | 2.8″ | 9 |
| December | 30° | 2.3″ | 9 |
Regional context
Similar climates Normal, IL, Downs, IL, Twin Grove, IL
Bloomington swings from 25°F in January to 75°F in July (50°F) per NOAA NCEI 1991-2020 normals; precipitation in Bloomington runs about 39.4 inches on roughly 113 measurable days.
Bloomington's rain peaks in summer: May brings 4.8 inches over 12.1 thunderstorm-fed days, while February sees just 2.0 inches across 8.3 days under cooler, drier air. That puts Bloomington in a summer-convective cohort with places like Normal, IL, Downs, IL and Twin Grove, IL.
Bloomington reaches its last hard frost near April 25; that is the cue for kale, peas, spinach, and parsnips. Heat-demanding starts go out a fortnight on in Bloomington, after the soil warms and cold snaps clear. The season ends by October 16 in Bloomington, once hard frosts set back in. That date is a median: Bloomington freezes sooner in half of years.
Similar climates: Normal, IL, Downs, IL, Twin Grove, IL, Shirley, IL, Towanda, IL.
Frequently asked
- When does it freeze in Bloomington?
- Frost typically leaves Bloomington by April 25 and returns to Bloomington near October 16.
- What is the rainy season in Bloomington?
- Rainfall in Bloomington peaks in May near 4.8 inches, out of about 39 inches annually.
- What is the warmest month in Bloomington?
- Bloomington peaks in July, when the mean runs near 75°F.
- What is the coldest month in Bloomington?
- January is Bloomington's coldest month, averaging about 25°F.
- When can I start a vegetable garden in Bloomington?
- Around April 25, start frost-hardy crops in Bloomington; tomatoes and basil belong a fortnight later.
- How many rainy days does Bloomington get?
- Bloomington averages about 113 days with measurable rain or snow each year.
- What hardiness zone is Bloomington?
- Because Bloomington bottoms near 25°F in January, that winter low sets Bloomington's USDA zone — verify by ZIP.
- What is the 10-day forecast for Bloomington?
- Bloomington'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 Bloomington?
- See this week's day-by-day rain chances for Bloomington in the daily forecast above, and the next 24 hours in the hourly chart.
- What is the weather like right now in Bloomington?
- Current conditions for Bloomington and the next 24 hours — temperature, precipitation chance, and wind by the hour — are in the hourly forecast chart above.
- How often is the Bloomington forecast updated?
- The Bloomington forecast on this page is built from Open-Meteo weather-model data and refreshes regularly through the day.
- When are sunrise and sunset in Bloomington?
- Today's sunrise and sunset times for Bloomington 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 Bloomington?
- The next few days in Bloomington's forecast are the most reliable; accuracy declines beyond about a week as weather-model uncertainty grows.
Bloomington sits at 40.5°N; its climate zone is humid subtropical (Köppen approximation).
ZIP codes in Bloomington
- 61701
- 61704
- 61705
- 61709
- 61710
- 61791