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Marietta, IL Weather Forecast for 5-Days

Updated: Sun Apr 12th 2026 6:30 PM CDT

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Marietta, IL Weather – 4-12 – Moderate Rain
81° / 58°
Moderate Rain
In Marietta, periods of rain are likely with highs near 81°F and lows around 58°F. The chance of rain is 79% with an estimated 0.4in. Winds will be strong at speeds peaking at 22mph and gusts of 29.3mph at 7 PM. The humidity will be on the higher side, averaging about 70%, the maximum being 92% at 10 PM and 86% being its lowest at 7 PM. Barometric pressure is its highest of 29.82inHg at 10 PM, a lowest point of 29.78inHg at 7 PM with an avg 29.8inHg.
Marietta, IL Weather – 4-13 – Scattered Thunderstorms
71° / 63°

Weather Tomorrow

Scattered Thunderstorms
In Marietta, stormy weather is expected with highs near 71°F and lows around 63°F. Wind will be moderate, blowing around 18mph on average and gusts of 28.2mph at 7 PM. High humidity with average of 92% is anticipated, the maximum being 98% at 7 AM and 82% being its lowest at 11 PM. Barometric pressure is its highest of 29.9inHg at 9 AM, a lowest point of 29.81inHg at 7 PM with an avg 29.85inHg.
Marietta, IL Weather – 4-14 – Scattered Thunderstorms
78° / 69°
Scattered Thunderstorms
Marietta may see storms, with daytime highs of 78°F and overnight lows near 69°F. Wind will be moderate, blowing around 20mph on average and gusts of 30.7mph at 10 PM. High humidity with average of 82% is anticipated, the maximum being 90% at 7 AM and 73% being its lowest at 4 PM. Barometric pressure is its highest of 29.81inHg at 11 PM, a lowest point of 29.71inHg at 7 PM with an avg 29.76inHg.
Marietta, IL Weather – 4-15 – Heavy Rain
75° / 64°
Heavy Rain
Rain showers are in the forecast for Marietta, with a high of 75°F and a low of 64°F. The chance of rain is 84% with an estimated 3.06in. Winds will be strong at speeds peaking at 21mph and gusts of 34.2mph at 7 PM. High humidity with average of 83% is anticipated, the maximum being 98% at 10 AM and 70% being its lowest at 4 PM. Barometric pressure is its highest of 29.76inHg at 7 PM, a lowest point of 29.7inHg at 4 AM with an avg 29.74inHg.
Marietta, IL Weather – 4-16 – Scattered Showers
77° / 57°
Scattered Showers
In Marietta, on and off showers are set to occur with highs near 77°F and lows around 57°F. Rainfall predicted to have a 69% chance with an estimated 0.09in. Wind will be moderate, blowing around 18mph on average and gusts of 29.8mph at 12 AM. The humidity will be on the higher side, averaging about 69%, the maximum being 92% at 3 AM and 43% being its lowest at 3 PM. Barometric pressure is its highest of 29.84inHg at 11 PM, a lowest point of 29.69inHg at 2 AM with an avg 29.76inHg.
Marietta, IL Weather – 4-17 – Scattered Showers
81° / 60°
Scattered Showers
On and off showers are set to occur in Marietta, with a high of 81°F and a low of 60°F. Rainfall predicted to have a 66% chance with an estimated 0.02in. Winds will be strong at speeds peaking at 21mph and gusts of 30.9mph at 11 PM. The humidity will be on the higher side, averaging about 75%, the maximum being 83% at 4 AM and 58% being its lowest at 1 PM. Barometric pressure is its highest of 29.84inHg at 1 AM, a lowest point of 29.64inHg at 11 PM with an avg 29.76inHg.

Currently

Light Rain 65°F
29.86 inHg.
Barometer
79%
Humidity
SSW 33.8 mph
Wind
Light Rain

5 Day Forecast Nearby

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