Mount Prospect, Illinois Weather
Mount Prospect weather this week
Over the next 7 days in Mount Prospect, daytime highs range from 8°C to 14°C and night-time lows from -4°C to 9°C. The warmest afternoon is likely on Thursday at 14°C, while the coolest night is expected on Monday night at -4°C. Temperatures trend warmer through the week, rising by about 4°C.
No significant rain is expected in Mount Prospect this week. The highest rain chance is just 10%, on Thursday.
Winds stay mostly light this week, peaking at about 25 km/h on Thursday. UV levels stay moderate or lower, peaking at 3. Average humidity is a comfortable 58% or so.
| Day | Conditions | High / Low | Rain chance | Rain | Max wind |
|---|---|---|---|---|---|
| Today (Saturday) | Partly cloudy | 8° / -1° | 6% | 0.0 mm | 16 km/h |
| Tomorrow (Sunday) | Overcast | 11° / -3° | 0% | 0.0 mm | 9 km/h |
| Monday | Overcast | 11° / -4° | 0% | 0.0 mm | 16 km/h |
| Tuesday | Overcast | 12° / 5° | 0% | 0.0 mm | 15 km/h |
| Wednesday | Overcast | 14° / 7° | 1% | 0.0 mm | 25 km/h |
| Thursday | Overcast | 14° / 9° | 10% | 0.0 mm | 25 km/h |
| Friday | Overcast | 14° / 7° | 7% | 0.0 mm | 16 km/h |
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Today's outlook for Mount Prospect
At 21:00 local time it is 2°C in Mount Prospect under clear skies, feeling like -2°C. Today's forecast high is 8°C and the low is -1°C, and the day overall looks partly cloudy. Rain is unlikely today (6% chance). Winds are blowing at about 7 km/h from the north-west. Humidity is 73%.
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Climate of Mount Prospect: monthly averages
Based on 25 years of satellite and reanalysis data (2001-2025), July is usually the hottest month in Mount Prospect, with average daytime highs around 29°C. January is the coolest, when nights typically fall to about -10°C and frost is possible on the coldest nights. That is a wide yearly range of roughly 39°C, so the seasons feel very different from each other.
The area receives about 980 mm of rain in a typical year. Most of it falls from May to August, and May is the wettest month at roughly 120 mm.
For outdoor plans and travel, September usually offers the most comfortable weather in Mount Prospect, with mild days and relatively little rain.
| Month | Avg high | Avg low | Rainfall | Humidity |
|---|---|---|---|---|
| Jan | -1° | -10° | 44 mm | 87% |
| Feb | 0° | -9° | 51 mm | 85% |
| Mar | 7° | -3° | 63 mm | 80% |
| Apr | 15° | 3° | 95 mm | 76% |
| May | 21° | 9° | 120 mm | 76% |
| Jun | 26° | 15° | 112 mm | 74% |
| Jul | 29° | 18° | 100 mm | 72% |
| Aug | 28° | 17° | 106 mm | 72% |
| Sep | 24° | 13° | 87 mm | 74% |
| Oct | 16° | 5° | 91 mm | 76% |
| Nov | 8° | -1° | 58 mm | 81% |
| Dec | 1° | -6° | 57 mm | 87% |
Source: NASA POWER (MERRA-2 reanalysis), averaged over the roughly 50 km grid area around Mount Prospect. Values describe typical conditions, not a forecast.
About Mount Prospect weather
Mount Prospect sits within Illinois's humid continental climate, shaped by its Great Lakes and prairie geography, about 33 km north-west of Chicago. Conditions turn hot with warm, humid summers (June–August). By December, expect cold winters (December–February) with regular snow, colder near Lake Michigan. This page shows live, auto-refreshing weather for Mount Prospect: current conditions, an hourly breakdown, a 16-day outlook, a date-lookup tool for any past or future date, and real-time air quality, sourced from Open-Meteo. Local timezone: America/Chicago.
Frequently asked questions
Mount Prospect is about 33 km north-west of Chicago, in Illinois.
Mount Prospect sees cold winters (December–February) with regular snow, colder near Lake Michigan.
The live current conditions, hourly forecast and 16-day outlook above are pulled in real time for Mount Prospect's exact coordinates. No fixed schedule, the page updates whenever you load it.
July is usually the hottest month in Mount Prospect, with average daytime highs of about 29°C and nights around 18°C.
The coldest nights come in January, when the average low is about -10°C and daytime highs reach around -1°C. Frost is possible on clear, calm nights.
Mount Prospect receives about 980 mm of rain in a typical year. May is the wettest month at roughly 120 mm, and the main rainy period is May to August.
September usually offers the most comfortable weather in Mount Prospect, with mild daytime temperatures and little rain.
In November Mount Prospect typically sees daytime highs near 8°C and lows near -1°C, with about 58 mm of rain over the month and average humidity around 81%. Check the live forecast above for this week's actual conditions.
Up to 16 days ahead using the extended forecast and date picker above; further-out or historical dates use the same date lookup tool.
Live temperature for Mount Prospect is shown at the top of this page and refreshes automatically — see the hourly breakdown below for how it changes through the day.
Mount Prospect's day-to-day weather follows the broader pattern of Illinois described above. See the hourly weather forecast or the air quality index for more detail.