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Marietta IL Weather - Mostly Cloudy - 66°F
Mostly Cloudy
66°F
Updated 5:08 pm
Feels Like 62°F
Humidity 96%
Wind ENE 5 mph
Barometer  30.24 in
Dew Point 65°F
Marietta IL Weather - Mostly Cloudy - 19°C
Mostly Cloudy
19°C
Updated 5:08 pm
Feels Like 17°C
Humidity 96%
Wind ENE 8 km/h
Barometer  102.4 kPa
Dew Point 18°C
Marietta, IL Weather and Current Conditionsmarietta il weather forecast

Marietta, IL Weather Forecast

Marietta Illinois WeatherMarietta, Illinois Weather Weather Forecast
14 day API forecast for Marietta, Illinois. Note. The 7-day weather forecast for Marietta, IL is the most reliable and accurate forecast. This model should only be used as a likely scenario. It is difficult to predict weather more than 7 days in advance.
Marietta, IL Weather Forecast Dated: 508 PM Fri Sep 25 2026
Expect a cool pattern with more clouds than sun and frequent chances of rain over the coming period. moderate humidity and no major pressure swings will dominate.

Friday, September 25, 2026

Mid-Morning
Marietta Weather - 2026-09-25 - Morning - Scattered Showers
60°F 16°C
Scattered Showers
Mid-Afternoon
Marietta Weather - 2026-09-25 - Afternoon - Overcast
64°F 18°C
Overcast
Early-Evening
Marietta Weather - 2026-09-25 - Evening - Overcast
62°F 17°C
Overcast
Refreshing around 64°F 18°C, periods of heavy rain and gusty conditions, with lower humidity and steady pressure.

Saturday, September 26, 2026

Mid-Morning
Marietta Weather - 2026-09-26 - Morning - Overcast
58°F 14°C
Overcast
Mid-Afternoon
Marietta Weather - 2026-09-26 - Afternoon - Overcast
62°F 17°C
Overcast
Early-Evening
Marietta Weather - 2026-09-26 - Evening - Overcast
63°F 17°C
Overcast
Mildly cool near 62°F 17°C, overcast throughout the day, with steady humidity and steady pressure.

Sunday, September 27, 2026

Mid-Morning
Marietta Weather - 2026-09-27 - Morning - Overcast
62°F 17°C
Overcast
Mid-Afternoon
Marietta Weather - 2026-09-27 - Afternoon - Cloudy
75°F 24°C
Cloudy
Early-Evening
Marietta Weather - 2026-09-27 - Evening - Overcast
68°F 21°C
Overcast
Enjoyable around 75°F 24°C, overcast in the morning, cloudy in the afternoon, and overcast this evening, with steady humidity and steady pressure. Winds turning from the ESE to the ENE at 9 mph 14 km/h.

Monday, September 28, 2026

Mid-Morning
Marietta Weather - 2026-09-28 - Morning - Partly Cloudy
61°F 16°C
Partly Cloudy
Mid-Afternoon
Marietta Weather - 2026-09-28 - Afternoon - Sunny
77°F 25°C
Sunny
Early-Evening
Marietta Weather - 2026-09-28 - Evening - Sunny
70°F 21°C
Sunny
Mild temperatures up to 77°F 25°C, partly cloudy in the morning, becoming sunny through the afternoon and evening, with steady humidity and barometric pressure falling. Winds switching from the E to the ESE at 8 mph 13 km/h.

Tuesday, September 29, 2026

Mid-Morning
Marietta Weather - 2026-09-29 - Morning - Overcast
65°F 18°C
Overcast
Mid-Afternoon
Marietta Weather - 2026-09-29 - Afternoon - Scattered Showers
67°F 19°C
Scattered Showers
Early-Evening
Marietta Weather - 2026-09-29 - Evening - Scattered Showers
67°F 20°C
Scattered Showers
Refreshing around 67°F 19°C, scattered downpours possible, with increasing humidity and barometric pressure falling. Winds moving from the SSE to the E at 6 mph 9 km/h.

Wednesday, September 30, 2026

Mid-Morning
Marietta Weather - 2026-09-30 - Morning - Light Showers
64°F 18°C
Light Showers
Mid-Afternoon
Marietta Weather - 2026-09-30 - Afternoon - Light Showers
64°F 18°C
Light Showers
Early-Evening
Marietta Weather - 2026-09-30 - Evening - Light Showers
65°F 18°C
Light Showers
Mildly cool near 64°F 18°C, on-and-off showers throughout the day, with steady humidity and steady pressure. Winds swinging from the SE to the SSW at 13 mph 20 km/h. Gusts up to 33 mph 53 km/h.

Thursday, October 1, 2026

Mid-Morning
Marietta Weather - 2026-10-01 - Morning - Light Showers
65°F 18°C
Light Showers
Mid-Afternoon
Marietta Weather - 2026-10-01 - Afternoon - Light Showers
67°F 19°C
Light Showers
Early-Evening
Marietta Weather - 2026-10-01 - Evening - Scattered Showers
64°F 18°C
Scattered Showers
Comfortable at 67°F 19°C, periods of heavy rain and gusty conditions, with steady humidity and steady pressure. Winds shifting from the SW to the WNW at 7 mph 11 km/h.

Friday, October 2, 2026

Mid-Morning
Marietta Weather - 2026-10-02 - Morning - Light Fog
65°F 19°C
Light Fog
Mid-Afternoon
Marietta Weather - 2026-10-02 - Afternoon - Partly Cloudy
76°F 24°C
Partly Cloudy
Early-Evening
Marietta Weather - 2026-10-02 - Evening - Cloudy
71°F 22°C
Cloudy
Enjoyable around 76°F 24°C, sunny in the morning, cloudy in the afternoon, and overcast this evening, with steady humidity and steady pressure.

Saturday, October 3, 2026

Mid-Morning
Marietta Weather - 2026-10-03 - Morning - Light Fog
72°F 22°C
Light Fog
Mid-Afternoon
Marietta Weather - 2026-10-03 - Afternoon - Scattered Showers
82°F 28°C
Scattered Showers
Early-Evening
Marietta Weather - 2026-10-03 - Evening - Scattered Showers
77°F 25°C
Scattered Showers
Very warm near 82°F 28°C, though humidity makes it feel like 85°F 29°C, locally heavy downpours at times, with steady humidity and steady pressure. Winds turning from the SSE to the S at 10 mph 15 km/h. Gusts up to 22 mph 35 km/h.

Sunday, October 4, 2026

Mid-Morning
Marietta Weather - 2026-10-04 - Morning - Cloudy
71°F 22°C
Cloudy
Mid-Afternoon
Marietta Weather - 2026-10-04 - Afternoon - Cloudy
78°F 25°C
Cloudy
Early-Evening
Marietta Weather - 2026-10-04 - Evening - Overcast
66°F 19°C
Overcast
Mild with a high of 78°F 25°C, overcast through the afternoon, turning cloudy this evening, with lower humidity and barometric pressure rising. Winds picking up from SW at 6 mph 9 km/h to ESE at 14 mph 22 km/h. Gusts up to 22 mph 35 km/h.

Monday, October 5, 2026

Mid-Morning
Marietta Weather - 2026-10-05 - Morning - Light Showers
47°F 8°C
Light Showers
Mid-Afternoon
Marietta Weather - 2026-10-05 - Afternoon - Partly Cloudy
53°F 12°C
Partly Cloudy
Early-Evening
Marietta Weather - 2026-10-05 - Evening - Overcast
49°F 9°C
Overcast
Chilly near 53°F 12°C, scattered morning showers before drying out later, with lower humidity and barometric pressure rising. Winds moving from the NNW to the NW at 13 mph 21 km/h. Gusts up to 27 mph 43 km/h.

Tuesday, October 6, 2026

Mid-Morning
Marietta Weather - 2026-10-06 - Morning - Sunny
43°F 6°C
Sunny
Mid-Afternoon
Marietta Weather - 2026-10-06 - Afternoon - Sunny
53°F 12°C
Sunny
Early-Evening
Marietta Weather - 2026-10-06 - Evening - Sunny
48°F 9°C
Sunny
Crisp with a high near 53°F 12°C, cloudy in the morning, becoming sunny through the afternoon and evening, with steady humidity and barometric pressure falling. Winds swinging from the NNW to the W at 4 mph 6 km/h.

Wednesday, October 7, 2026

Mid-Morning
Marietta Weather - 2026-10-07 - Morning - Sunny
48°F 9°C
Sunny
Mid-Afternoon
Marietta Weather - 2026-10-07 - Afternoon - Partly Cloudy
64°F 18°C
Partly Cloudy
Early-Evening
Marietta Weather - 2026-10-07 - Evening - Sunny
58°F 15°C
Sunny
Refreshing around 64°F 18°C, sunny through the afternoon, turning overcast this evening, with increasing humidity and barometric pressure falling. Winds shifting from the SSW to the W at 10 mph 15 km/h.

Thursday, October 8, 2026

Mid-Morning
Marietta Weather - 2026-10-08 - Morning - Overcast
49°F 10°C
Overcast
Mid-Afternoon
Marietta Weather - 2026-10-08 - Afternoon - Sunny
56°F 13°C
Sunny
Early-Evening
Marietta Weather - 2026-10-08 - Evening - Sunny
48°F 9°C
Sunny
Cool and brisk at 56°F 13°C, overcast in the morning, sunny in the afternoon, and partly cloudy this evening, with steady humidity and steady pressure. Winds turning from the NNW to the N at 13 mph 21 km/h. Gusts up to 25 mph 40 km/h.

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Weather by the Numbers

Fri, 25th
Marietta IL Weather - Friday, Sep 25, 2026 - Light Drizzle
Hi: 66°F 19°C
Lo: 60°F 16°C
Sunrise 06:52 AM
Sunset 06:53 PM
Wind E 6 mph10 km/h
Dew Point 57°F14°C
uv Index 1
Barometric Pressure 30.27 in1025 mb
POP 46% *
Humidity 87%
Sat, 26th
Marietta IL Weather - Saturday, Sep 26, 2026 - Patchy Rain Nearby
Hi: 64°F 18°C
Lo: 57°F 14°C
Sunrise 06:53 AM
Sunset 06:52 PM
Wind ESE 2 mph4 km/h
Dew Point 47°F8°C
uv Index 1
Barometric Pressure 30.18 in1022 mb
POP 16% *
Humidity 60%
Sun, 27th
Marietta IL Weather - Sunday, Sep 27, 2026 - Overcast
Hi: 75°F 24°C
Lo: 59°F 15°C
Sunrise 06:54 AM
Sunset 06:50 PM
Wind SE 7 mph11 km/h
Dew Point 46°F8°C
uv Index 4
Barometric Pressure 30.06 in1018 mb
POP 10% *
Humidity 41%
Mon, 28th
Marietta IL Weather - Monday, Sep 28, 2026 - Overcast
Hi: 77°F 25°C
Lo: 60°F 15°C
Sunrise 06:55 AM
Sunset 06:48 PM
Wind ESE 6 mph10 km/h
Dew Point 35°F2°C
uv Index 5
Barometric Pressure 30.03 in1017 mb
POP 8% *
Humidity 26%
Tue, 29th
Marietta IL Weather - Tuesday, Sep 29, 2026 - Overcast
Hi: 69°F 21°C
Lo: 62°F 17°C
Sunrise 06:56 AM
Sunset 06:47 PM
Wind SE 5 mph8 km/h
Dew Point 47°F8°C
uv Index 2
Barometric Pressure 29.85 in1011 mb
POP 11% *
Humidity 46%
Wed, 30th
Marietta IL Weather - Wednesday, Sep 30, 2026 - Light Rain Shower
Hi: 70°F 21°C
Lo: 63°F 17°C
Sunrise 06:57 AM
Sunset 06:45 PM
Wind SSE 13 mph20 km/h
Dew Point 61°F16°C
uv Index 4
Barometric Pressure 29.74 in1007 mb
POP 71% *
Humidity 93%
Thu, 1st
Marietta IL Weather - Thursday, Oct 1, 2026 - Light Rain Shower
Hi: 70°F 21°C
Lo: 62°F 17°C
Sunrise 06:58 AM
Sunset 06:43 PM
Wind WSW 9 mph14 km/h
Dew Point 65°F18°C
uv Index 5
Barometric Pressure 29.68 in1005 mb
POP 47% *
Humidity 90%
Fri, 2nd
Marietta IL Weather - Friday, Oct 2, 2026 - Sunny
Hi: 76°F 25°C
Lo: 62°F 16°C
Sunrise 06:59 AM
Sunset 06:42 PM
Wind WSW 3 mph4 km/h
Dew Point 62°F16°C
uv Index 6
Barometric Pressure 29.94 in1014 mb
POP 7% *
Humidity 70%
Sat, 3rd
Marietta IL Weather - Saturday, Oct 3, 2026 - Partly Cloudy
Hi: 83°F 28°C
Lo: 66°F 19°C
Sunrise 07:00 AM
Sunset 06:40 PM
Wind S 16 mph26 km/h
Dew Point 66°F19°C
uv Index 7
Barometric Pressure 29.88 in1012 mb
POP 12% *
Humidity 66%
Sun, 4th
Marietta IL Weather - Sunday, Oct 4, 2026 - Overcast
Hi: 78°F 25°C
Lo: 59°F 15°C
Sunrise 07:01 AM
Sunset 06:38 PM
Wind W 6 mph10 km/h
Dew Point 68°F20°C
uv Index 5
Barometric Pressure 30.06 in1018 mb
POP 18% *
Humidity 77%
Mon, 5th
Marietta IL Weather - Monday, Oct 5, 2026 - Light Rain Shower
Hi: 58°F 15°C
Lo: 45°F 7°C
Sunrise 07:02 AM
Sunset 06:37 PM
Wind NNW 16 mph26 km/h
Dew Point 39°F4°C
uv Index 2
Barometric Pressure 30.12 in1020 mb
POP 18% *
Humidity 68%
Tue, 6th
Marietta IL Weather - Tuesday, Oct 6, 2026 - Overcast
Hi: 54°F 12°C
Lo: 38°F 4°C
Sunrise 07:03 AM
Sunset 06:35 PM
Wind NW 8 mph13 km/h
Dew Point 29°F-2°C
uv Index 2
Barometric Pressure 30.39 in1029 mb
POP 3% *
Humidity 44%
Wed, 7th
Marietta IL Weather - Wednesday, Oct 7, 2026 - Sunny
Hi: 65°F 18°C
Lo: 42°F 5°C
Sunrise 07:04 AM
Sunset 06:34 PM
Wind SW 16 mph26 km/h
Dew Point 34°F1°C
uv Index 4
Barometric Pressure 30 in1016 mb
POP 2% *
Humidity 40%
Thu, 8th
Marietta IL Weather - Thursday, Oct 8, 2026 - Overcast
Hi: 56°F 14°C
Lo: 41°F 5°C
Sunrise 07:05 AM
Sunset 06:32 PM
Wind NNW 16 mph25 km/h
Dew Point 37°F3°C
uv Index 3
Barometric Pressure 29.91 in1013 mb
POP 5% *
Humidity 52%
* POP = Probability of Precipitation. Data for 12:00 PM.