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As of 08:20 CDT

Weather in Marietta, IL

39°Current weather

Marietta, Tuesday, 20 October, 08:20

Clear. Feels like 37°. High 70°, low 39°.

Pressure30.39 inHg
Wind3.2 mph E
Humidity90%
Visibility6.2 mi
Dew point38°
Wed, 2173° / 44°0Clear
73 °Clear

Marietta, Wednesday, 21 October

Clear. High 73°, low 44°.

Pressure30.27 inHg
Wind3.1 mph SW
Humidity49%
Visibility6.2 mi
Dew point48°
Thu, 2272° / 48°0Clear
72 °Clear

Marietta, Thursday, 22 October

Clear. High 72°, low 48°.

Pressure30.30 inHg
Wind1.9 mph E
Humidity52%
Visibility6.2 mi
Dew point51°
Fri, 2369° / 51°0Clear
69 °Clear

Marietta, Friday, 23 October

Clear. High 69°, low 51°.

Pressure30.33 inHg
Wind7 mph SE
Humidity55%
Visibility6.2 mi
Dew point51°
Sat, 2471° / 51°0Overcast
71 °Overcast

Marietta, Saturday, 24 October

Overcast. High 71°, low 51°.

Pressure30.30 inHg
Wind9.2 mph S
Humidity49%
Visibility—
Dew point47°
Sun, 2575° / 54°0Overcast
75 °Overcast

Marietta, Sunday, 25 October

Overcast. High 75°, low 54°.

Pressure30.36 inHg
Wind6.7 mph S
Humidity49%
Visibility—
Dew point50°
Mon, 2669° / 42°0.1Light rain
69 °Light rain

Marietta, Monday, 26 October

Light rain. High 69°, low 42°.

Pressure30.09 inHg
Wind16.2 mph NW
Humidity41%
Visibility—
Dew point43°
Tue, 2749° / 36°0.03Light rain
49 °Light rain

Marietta, Tuesday, 27 October

Light rain. High 49°, low 36°.

Pressure30.47 inHg
Wind14.8 mph NW
Humidity38%
Visibility—
Dew point22°
Wed, 2849° / 31°0Clear
49 °Clear

Marietta, Wednesday, 28 October

Clear. High 49°, low 31°.

Pressure30.42 inHg
Wind10.6 mph SW
Humidity36%
Visibility—
Dew point19°
Thu, 2953° / 37°0Clear
53 °Clear

Marietta, Thursday, 29 October

Clear. High 53°, low 37°.

Pressure30.15 inHg
Wind13.2 mph NW
Humidity41%
Visibility—
Dew point28°
Fri, 3046° / 35°0Clear
46 °Clear

Marietta, Friday, 30 October

Clear. High 46°, low 35°.

Pressure30.45 inHg
Wind13.2 mph N
Humidity42%
Visibility—
Dew point22°
Sat, 3152° / 31°0Overcast
52 °Overcast

Marietta, Saturday, 31 October

Overcast. High 52°, low 31°.

Pressure30.27 inHg
Wind11.3 mph SW
Humidity35%
Visibility—
Dew point20°
Sun, 0156° / 44°0Overcast
56 °Overcast

Marietta, Sunday, 1 November

Overcast. High 56°, low 44°.

Pressure30.12 inHg
Wind10.2 mph SW
Humidity70%
Visibility—
Dew point41°
Mon, 0263° / 44°0Mostly clear
63 °Mostly clear

Marietta, Monday, 2 November

Mostly clear. High 63°, low 44°.

Pressure30.27 inHg
Wind9.3 mph S
Humidity52%
Visibility—
Dew point41°
Tue, 0362° / 47°0.28Rain
62 °Rain

Marietta, Tuesday, 3 November

Rain. High 62°, low 47°.

Pressure30.12 inHg
Wind18.1 mph S
Humidity42%
Visibility—
Dew point37°
Wed, 0463° / 52°0.88Rain
63 °Rain

Marietta, Wednesday, 4 November

Rain. High 63°, low 52°.

Pressure29.91 inHg
Wind16.3 mph S
Humidity79%
Visibility—
Dew point54°

About the monthly outlook

How accurate is a 30-day forecast?

The first 16 days come from weather models — reliable for the first 3–5 days and progressively less so after that. Days 17 through 30 for Marietta, IL are built from the climate normal, the 60-year average, so they show typical weather for those dates rather than a specific forecast.

What does "above normal" mean?

We compare the forecast against the climate normal for those exact calendar days, computed from 60 years of observations. The deviation shows how much the coming month differs from a typical one.

Where do the 66-year records come from?

They are real temperature extremes recorded in Marietta, IL since 1960: the highest and lowest reading for each calendar date, with the year it happened.

How often is it updated?

The forecast portion refreshes every hour; the climate portion is based on long-term data and stays stable.