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As of 23:45 CDT

Weather in Marietta, IL

45°Current weather

Marietta, Monday, 19 October, 23:45

Overcast. Feels like 43°. High 70°, low 40°.

Pressure30.33 inHg
Wind4 mph SE
Humidity80%
Visibility6.2 mi
Dew point39°
Tue, 2071° / 42°0Clear
71 °Clear

Marietta, Tuesday, 20 October

Clear. High 71°, low 42°.

Pressure30.36 inHg
Wind4.3 mph SE
Humidity42%
Visibility6.2 mi
Dew point43°
Wed, 2171° / 44°0Clear
71 °Clear

Marietta, Wednesday, 21 October

Clear. High 71°, low 44°.

Pressure30.27 inHg
Wind3.2 mph SW
Humidity48%
Visibility6.2 mi
Dew point48°
Thu, 2272° / 48°0Clear
72 °Clear

Marietta, Thursday, 22 October

Clear. High 72°, low 48°.

Pressure30.30 inHg
Wind1.4 mph E
Humidity51%
Visibility6.2 mi
Dew point50°
Fri, 2370° / 50°0Clear
70 °Clear

Marietta, Friday, 23 October

Clear. High 70°, low 50°.

Pressure30.33 inHg
Wind6.2 mph SE
Humidity62%
Visibility6.2 mi
Dew point52°
Sat, 2468° / 48°0Overcast
68 °Overcast

Marietta, Saturday, 24 October

Overcast. High 68°, low 48°.

Pressure30.36 inHg
Wind8.6 mph S
Humidity49%
Visibility—
Dew point44°
Sun, 2570° / 53°0Overcast
70 °Overcast

Marietta, Sunday, 25 October

Overcast. High 70°, low 53°.

Pressure30.36 inHg
Wind7.4 mph SW
Humidity52%
Visibility—
Dew point49°
Mon, 2659° / 51°0.35Rain
59 °Rain

Marietta, Monday, 26 October

Rain. High 59°, low 51°.

Pressure30.30 inHg
Wind8.6 mph NE
Humidity79%
Visibility—
Dew point49°
Tue, 2750° / 36°0.65Rain
50 °Rain

Marietta, Tuesday, 27 October

Rain. High 50°, low 36°.

Pressure30.36 inHg
Wind17.3 mph NW
Humidity60%
Visibility—
Dew point33°
Wed, 2842° / 28°0Clear
42 °Clear

Marietta, Wednesday, 28 October

Clear. High 42°, low 28°.

Pressure30.53 inHg
Wind11 mph N
Humidity34%
Visibility—
Dew point12°
Thu, 2950° / 28°0Clear
50 °Clear

Marietta, Thursday, 29 October

Clear. High 50°, low 28°.

Pressure30.27 inHg
Wind8.6 mph W
Humidity33%
Visibility—
Dew point18°
Fri, 3055° / 36°0Partly cloudy
55 °Partly cloudy

Marietta, Friday, 30 October

Partly cloudy. High 55°, low 36°.

Pressure30.12 inHg
Wind11.2 mph SW
Humidity33%
Visibility—
Dew point23°
Sat, 3165° / 43°0Partly cloudy
65 °Partly cloudy

Marietta, Saturday, 31 October

Partly cloudy. High 65°, low 43°.

Pressure30.12 inHg
Wind11.5 mph S
Humidity34%
Visibility—
Dew point31°
Sun, 0160° / 49°0.1Light rain
60 °Light rain

Marietta, Sunday, 1 November

Light rain. High 60°, low 49°.

Pressure30.09 inHg
Wind13.2 mph S
Humidity44%
Visibility—
Dew point37°
Mon, 0257° / 51°0.44Rain
57 °Rain

Marietta, Monday, 2 November

Rain. High 57°, low 51°.

Pressure29.94 inHg
Wind11.2 mph NW
Humidity91%
Visibility—
Dew point51°
Tue, 0362° / 47°0Mostly clear
62 °Mostly clear

Marietta, Tuesday, 3 November

Mostly clear. High 62°, low 47°.

Pressure30.00 inHg
Wind9.8 mph NW
Humidity63%
Visibility—
Dew point47°

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.