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Weather for 61840 — Dewey, IL

Conditions and forecast for the exact centre of ZIP code 61840 (40.313, -88.277), not a nearby airport.

55°

Light rain

Feels like:
51°
Humidity:
59%
Wind:
15 mph
Dew point:
41°

Source updated: 8:31:48 PM · WeatherSignal checked: 8:31:48 PM

Source: Open-Meteo (national weather-service models)

Next 12 hours in 61840

9 PM

54°

0%

10 PM

56°

0%

11 PM

51°

0%

12 AM

52°

0%

1 AM

52°

0%

2 AM

51°

0%

3 AM

50°

0%

4 AM

48°

0%

5 AM

47°

0%

6 AM

46°

0%

7 AM

45°

0%

8 AM

44°

0%

7 day forecast for 61840

  • Today

    56° / 51°

    0% rain · 16 mph wind

  • Saturday, Oct 17

    57° / 40°

    0% rain · 15 mph wind

  • Sunday, Oct 18

    63° / 41°

    0% rain · 10 mph wind

  • Monday, Oct 19

    64° / 42°

    0% rain · 7 mph wind

  • Tuesday, Oct 20

    67° / 42°

    0% rain · 5 mph wind

  • Wednesday, Oct 21

    67° / 43°

    0% rain · 5 mph wind

  • Thursday, Oct 22

    69° / 44°

    0% rain · 5 mph wind

About ZIP code 61840

61840 covers Dewey in Illinois. Forecasts on this page are generated for the coordinates at the centre of the ZIP code, so small differences from a nearby city forecast are expected and usually correct.

Closest cities with full forecast pages: Peoria (74 mi), Springfield (81 mi), Joliet (84 mi), Naperville (99 mi).

Nearby ZIP codes

Severe weather warnings are issued by the National Weather Service for counties and polygons that may not line up with ZIP code boundaries. Always follow official warnings for your exact address.

Planning your week in Dewey 61840, Illinois

  • The warmest afternoon ahead is Thursday, reaching about 69°F.
  • The coldest night ahead dips to about 40°F.
  • This is a dry stretch — most days show rain chances under 20%, good for outdoor plans.
  • The breeziest day looks like today, with sustained wind near 16 mph.

Common questions about Dewey 61840, Illinois weather

How accurate is the Dewey 61840, Illinois forecast?
The next 48 hours are usually reliable on temperature and sky cover, with timing that can shift by an hour or two. Days three and four are dependable for the overall pattern. Beyond that, treat the numbers as a planning direction rather than a promise — we label confidence on every day so you can judge for yourself.
What is the best day this week in Dewey 61840, Illinois?
No day in the current outlook has a rain chance above 40%, so conditions look favorable for outdoor plans across the week.
Where does this forecast come from?
Forecast values come from national weather model data, and official warnings come from the National Weather Service. We show the source and the last-updated time on every page, and we never invent a number the source did not publish — missing measurements are hidden, not guessed.
How often is this page updated?
The forecast refreshes whenever the source model publishes new data, typically several times a day. The freshness note near the top of the page shows exactly when the numbers you are looking at were issued.

More weather for Dewey 61840, Illinois

Weather in nearby cities

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