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Merna, IL Weather Tomorrow

Explore tomorrow's Merna weather before planning your week with a detailed 5 day forecast featuring precipitation probability, daily and nightly weather conditions, high and low temperature trends, sunrise and sunset information, sky cover, wind speed, wind direction, and wind chill for the Merna area and around McLean county, Illinois.
Updated: Sat Sep 12th 2026 11:45 AM CDT
Merna, IL Weather – 9-12 – Sunny
90° / 65°
Sunny
Highs will reach 90°F with lows near 65°F in Merna, where a sunny day is. There's a very small chance of rainfall, only about 7%. Winds will be light at 9mph and gusts of 13.2mph at 10 PM. The humidity will be on the higher side, averaging about 75%, the maximum being 90% at 11 PM and 38% being its lowest at 4 PM. Barometric pressure is its highest of 29.93inHg at 9 PM, a lowest point of 29.85inHg at 3 PM with an avg 29.89inHg.
Merna, IL Weather – 9-13 – Overcast
75° / 62°

Weather Tomorrow

Overcast
In Merna, skies will be overcast with highs near 75°F and lows around 62°F. There might be light rainfall having a 24% chance with an estimated 0.01in. Wind will be moderate, blowing around 14mph on average and gusts of 21.9mph at 11 PM. The humidity will be on the higher side, averaging about 69%, the maximum being 91% at 12 AM and 45% being its lowest at 3 PM. Barometric pressure is its highest of 30.15inHg at 11 PM, a lowest point of 29.94inHg at 12 AM with an avg 30.05inHg.
Merna, IL Weather – 9-14 – Overcast
71° / 56°
Overcast
Daytime highs will reach 71°F with lows dropping to 56°F in Merna, where it will be overcast. There might be light rainfall having a 21% chance with an estimated 0.01in. Wind will be moderate, blowing around 15mph on average and gusts of 36.1mph at 11 PM. The humidity will be on the higher side, averaging about 72%, the maximum being 84% at 6 AM and 61% being its lowest at 11 AM. Barometric pressure is its highest of 30.23inHg at 10 AM, a lowest point of 29.99inHg at 11 PM with an avg 30.13inHg.
Merna, IL Weather – 9-15 – Sunny
88° / 72°
Sunny
In Merna, bright and sunny conditions with highs near 88°F and lows around 72°F. There's a moderate 41% chance of rainfall with an estimated 0.03in. Wind will be moderate, blowing around 16mph on average and gusts of 38.9mph at 3 AM. The humidity will be on the higher side, averaging about 70%, the maximum being 89% at 10 PM and 49% being its lowest at 3 PM. Barometric pressure is its highest of 30.12inHg at 11 PM, a lowest point of 29.95inHg at 4 AM with an avg 30.02inHg.
Merna, IL Weather – 9-16 – Light Rain Shower
78° / 64°
Light Rain Shower
In Merna, periods of rain are likely with highs near 78°F and lows around 64°F. The chance of rain is 80% with an estimated 0.22in. Wind will be moderate, blowing around 13mph on average and gusts of 20.6mph at 9 PM. High humidity with average of 86% is anticipated, the maximum being 98% at 11 PM and 65% being its lowest at 3 PM. Barometric pressure is its highest of 30.25inHg at 11 AM, a lowest point of 30.1inHg at 3 AM with an avg 30.16inHg.
Merna, IL Weather – 9-17 – Scattered Showers
83° / 64°
Scattered Showers
Scattered showers are in the forecast for Merna, with a high of 83°F and a low of 64°F. The chance of rain is 90% with an estimated 0.49in. Winds will be light at 9mph and gusts of 16mph at 12 AM. High humidity with average of 89% is anticipated, the maximum being 99% at 4 AM and 56% being its lowest at 10 PM. Barometric pressure is its highest of 30.19inHg at 12 AM, a lowest point of 30inHg at 10 PM with an avg 30.13inHg.

Currently

Sunny 86°F
29.91 inHg.
Barometer
69%
Humidity
WSW 10.4 mph
Wind
Sunny

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