Illinois אקלים and Average מזג אוויר
אקלים of Illinois: average temperatures, rainfall and seasons month by month.
אקלים in Illinois month by month
Average high, average low and total rainfall, based on three years of reanalysis data.
| חודש | Avg high | Avg low | גשםfall | Rating |
|---|---|---|---|---|
| ינואר | 1° | -7° | 62 mm | ★★☆☆☆ |
| פברואר | 8° | -3° | 20 mm | ★★★☆☆ |
| מרץ | 15° | 4° | 90 mm | ★★★☆☆ |
| אפריל | 19° | 9° | 135 mm | ★★★☆☆ |
| מאי | 24° | 13° | 100 mm | ★★★★☆ |
| יוני | 28° | 19° | 117 mm | ★★★★☆ |
| יולי | 29° | 21° | 129 mm | ★★★★☆ |
| אוגוסט | 28° | 19° | 47 mm | ★★★★☆ |
| ספטמבר | 27° | 16° | 42 mm | ★★★★☆ |
| אוקטובר | 20° | 10° | 37 mm | ★★★★☆ |
| נובמבר | 12° | 4° | 79 mm | ★★★☆☆ |
| דצמבר | 6° | -2° | 62 mm | ★★☆☆☆ |
אקלים type: יבשתal. מקור: Open-Meteo archive (ERA5).
Recent extremes in Illinois
גבוהest and lowest readings observed in the last 3 years of reanalysis data - not all-time records.
How Illinois compares עם nearby places
Annual averages, and the difference against Illinois.
| Place | Distance | Avg temp | vs here | Annual rain |
|---|---|---|---|---|
| Gateway Arch National Park | 137 km | 15°C | +1°C warmer | 1144 mm |
| St. Louis | 137 km | 15°C | +1°C warmer | 1144 mm |
| Missouri | 255 km | 14°C | +1°C warmer | 1002 mm |
| Indianapolis | 298 km | 13°C | 1°C cooler | 1094 mm |
| Indiana | 298 km | 13°C | 1°C cooler | 1094 mm |
אקלים by city in Illinois
1 cities mapped in this atlas
אקלים by state park in Illinois
1 state and provincial parks mapped in this atlas
אקלים by county in Illinois
1 counties mapped in this atlas
אקלים by lake in Illinois
1 lakes mapped in this atlas
הזמן הטוב ביותר לביקור Illinois
Go in אוגוסט, ספטמבר and אוקטובר. These months score highest on comfortable temperatures, low rainfall and useful daylight.
Hardest months: ינואר, פברואר and דצמבר - expect the least comfortable mix of heat, cold or rain.
What this means for Illinois
Today is about average for אוגוסט. The forecast high of 27°C is in line עם the 28°C typical for this month.
גשם is very unlikely today - plans do not need a backup.
No weather-related travel disruption is expected today. Roads and airports should run normally.
Northern Hemisphere, so peak summer falls in יוני ל- אוגוסט.
The gap between the warmest and coldest month averages 29°C.
What ל- pack, what ל- skip
- Lightweight, light-coloured clothing and a refillable water bottle
- א׳glasses, a brimmed hat and SPF 30+
- If your dates are flexible, avoid ינואר, פברואר and דצמבר - historically the least comfortable months here.
סיכום
Illinois is a state in ארצות הברית. Illinois is a US state שבירתה Springfield. אוכלוסייתה כ-12.6 million. הבירה היא Springfield.
כרגע הטמפרטורה היא 18°C (64°F) in Illinois עם בהיר. מרגיש כמו 17°C. היום הטמפרטורות נעות בין 16°C ל- 27°C. הסיכוי למשקעים הוא 0%. Sightseeing conditions score 9.7/10 - מצוין — אפשר לצאת עכשיו.
הזמן הטוב ביותר לבקר בIllinois is אוגוסט, ספטמבר and אוקטובר. האקלים הוא continental. ינואר, פברואר and דצמבר tend ל- be the least comfortable months. יולי is the warmest month עם average highs near 29°C, while ינואר is the coldest עם lows near -7°C.
The closest major airport is O'Hare International Airport (ORD), about 284 km away. Nearby highlights include Starved Rock State Park, Lake Michigan, Gateway Arch National Park and Indiana Dunes National Park.
במילים פשוטות. Today is about average for אוגוסט. The forecast high of 27°C is in line עם the 28°C typical for this month. The best window ל- be outside is roughly 9 AM ל- 12 PM, when temperature, rain chance and wind line up best. stargazing is the strongest bet in Illinois today at 9.9/10. No weather-related travel disruption is expected today. Roads and airports should run normally.
Compiled from this page's own data: atlas facts plus live Open-Meteo readings.
Quick facts about Illinois
| סוג | State |
|---|---|
| מדינה | ארצות הברית |
| יבשת | צפון אמריקה |
| קואורדינטות | 39°46′54.1″N 89°39′0.4″W (39.7817, -89.6501) |
| Capital | Springfield |
| אוכלוסייה | 12.600.000 |
| Area | 149.995 km² |
| Abbreviation | IL |
| אזור זמן | America/Chicago |
| שעה מקומית | 4:50 AM (UTC-05:00) |
| Best months | אוגוסט, ספטמבר and אוקטובר |
| אקלים | יבשתal |
מזג אוויר map for Illinois
Animated model layers. Pick a layer ל- load it.
Animated layers by רוחy. For pin-level detail and nearby places, see the interactive map below.
Explore Illinois
Every topic we hold for this place, and the same topic for the places around it.
אקלים for related places
Frequently asked questions
Where is Illinois?
Illinois is a state in ארצות הברית. Its coordinates are 39.7817, -89.6501. It lies in צפון אמריקה.
What is the weather like in Illinois עכשיו?
It is currently 18°C (64°F) עם בהיר. לחות is 74% and wind is 7 km/h.
When is the best time ל- visit Illinois?
אוגוסט, ספטמבר and אוקטובר offer the most comfortable conditions in Illinois, which has a continental climate. ינואר, פברואר and דצמבר are usually the hardest months for outdoor plans.
What time zone is Illinois in?
Illinois observes America/Chicago (UTC-05:00). The local time is 4:50 AM.
How many people live in Illinois?
Illinois has a population of approximately 12.6 million.
What is the nearest airport ל- Illinois?
The closest airports are O'Hare International Airport (ORD), 284 km away and Nashville International Airport (BNA), 483 km away.
What are the top things ל- do in Illinois?
Popular options include Starved Rock State Park, Lake Michigan, Gateway Arch National Park and Indiana Dunes National Park.
What places are in Illinois?
Illinois covers 4 places in this atlas, including Chicago, Starved Rock State Park, Cook County and Lake Michigan.
Related articles
Data sources and methodology
| Place data | USPOTUS Atlas dataset (us-states) - coordinates, hierarchy and facts. |
|---|---|
| תחזית and observations | Open-Meteo (ECMWF and national models). |
| איכות האוויר and pollen | Copernicus CAMS via Open-Meteo. US AQI scale. |
| אקלים averages | ERA5 reanalysis via the Open-Meteo archive, aggregated over 3 years. |
| Official alerts | US National מזג אוויר Service. |
| Method | Scores, comparisons and advice on this page are computed from the inputs above. Distances are straight-line. Nothing is estimated where data is missing - the block is simply not shown. |
Last updated אוגוסט 24, 2026 at 4:50 AM local time. Live blocks refresh every 15 minutes; climate averages monthly.
