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Merna, IL Weather Forecast
Merna, IL Weather Forecast Dated: 148 AM Tue Sep 15 2026
Expect a mild stretch with a mix of sun and clouds and frequent chances of rain over the coming period. generally humid conditions and no major pressure swings will dominate.
Tuesday, September 15, 2026
Mid-Morning
70°F 21°C
Light Showers
Mid-Afternoon
82°F 28°C
Scattered Showers
Early-Evening
79°F 26°C
Cloudy
Warm and summery around 82°F 28°C (feels like 87°F 30°C), periods of heavy rain and gusty conditions, with steady humidity and steady pressure.
Wednesday, September 16, 2026
Mid-Morning
70°F 21°C
Scattered Showers
Mid-Afternoon
77°F 25°C
Cloudy
Early-Evening
74°F 24°C
Light Showers
Comfortable with temperatures reaching 77°F 25°C, scattered downpours possible, with steady humidity and steady pressure.
Thursday, September 17, 2026
Mid-Morning
69°F 21°C
Light Fog
Mid-Afternoon
77°F 25°C
Partly Cloudy
Early-Evening
76°F 25°C
Overcast
Enjoyable around 77°F 25°C, overcast in the morning, becoming cloudy through the afternoon and evening, with steady humidity and steady pressure.
Friday, September 18, 2026
Mid-Morning
70°F 21°C
Sunny
Mid-Afternoon
85°F 29°C
Sunny
Early-Evening
82°F 28°C
Sunny
Warm and summery around 85°F 29°C (feels like 89°F 32°C), sunny throughout the day, with steady humidity and barometric pressure falling. Winds turning from the E to the ESE at 8 mph 13 km/h.
Saturday, September 19, 2026
Mid-Morning
76°F 25°C
Sunny
Mid-Afternoon
93°F 34°C
Sunny
Early-Evening
88°F 31°C
Partly Cloudy
Hot and sweltering around 93°F 34°C (heat index 96°F 35°C), partly cloudy through the afternoon, turning cloudy this evening, with lower humidity and steady pressure. Winds switching from the SSW to the ESE at 8 mph 13 km/h.
Sunday, September 20, 2026
Mid-Morning
75°F 24°C
Scattered Showers
Mid-Afternoon
88°F 31°C
Sunny
Early-Evening
83°F 28°C
Overcast
Warm and summery near 88°F 31°C, locally heavy downpours at times, with lower humidity and steady pressure. Winds moving from the SW to the SSE at 5 mph 7 km/h.
Monday, September 21, 2026
Mid-Morning
73°F 23°C
Light Fog
Mid-Afternoon
81°F 27°C
Overcast
Early-Evening
73°F 23°C
Overcast
Balmy with temperatures reaching 81°F 27°C, overcast throughout the day, with steady humidity and steady pressure. Winds swinging from the WSW to the SSW at 5 mph 8 km/h.
Tuesday, September 22, 2026
Mid-Morning
65°F 19°C
Light Fog
Mid-Afternoon
74°F 24°C
Overcast
Early-Evening
68°F 20°C
Overcast
Enjoyable around 74°F 24°C, overcast throughout the day, with lower humidity and steady pressure. Winds shifting from the WNW to the NNW at 9 mph 14 km/h.
Wednesday, September 23, 2026
Mid-Morning
63°F 17°C
Overcast
Mid-Afternoon
67°F 20°C
Scattered Showers
Early-Evening
65°F 19°C
Scattered Showers
Refreshing around 67°F 20°C, locally heavy downpours at times, with steady humidity and steady pressure.
Thursday, September 24, 2026
Mid-Morning
63°F 17°C
Overcast
Mid-Afternoon
76°F 24°C
Overcast
Early-Evening
71°F 21°C
Sunny
Mild with a high of 76°F 24°C, overcast in the morning, partly cloudy in the afternoon, and cloudy this evening, with lower humidity and steady pressure. Winds increasing from the SW at 2 mph 4 km/h to NNW at 12 mph 20 km/h. Gusts up to 22 mph 36 km/h.
Friday, September 25, 2026
Mid-Morning
53°F 12°C
Sunny
Mid-Afternoon
62°F 17°C
Sunny
Early-Evening
58°F 15°C
Sunny
Comfortable at 62°F 17°C, sunny throughout the day, with steady humidity and steady pressure. Winds out of the NNW at 12 mph 19 km/h.
Saturday, September 26, 2026
Mid-Morning
54°F 12°C
Sunny
Mid-Afternoon
64°F 18°C
Sunny
Early-Evening
59°F 15°C
Sunny
Cool with a high near 64°F 18°C, sunny throughout the day, with steady humidity and steady pressure. Winds moving from the N to the NNE at 8 mph 13 km/h.
Sunday, September 27, 2026
Mid-Morning
52°F 11°C
Sunny
Mid-Afternoon
61°F 16°C
Sunny
Early-Evening
56°F 14°C
Sunny
Refreshing around 61°F 16°C, sunny throughout the day, with steady humidity and steady pressure. Winds swinging from the ENE to the NE at 9 mph 15 km/h.
Monday, September 28, 2026
Mid-Morning
53°F 12°C
Sunny
Mid-Afternoon
66°F 19°C
Sunny
Early-Evening
61°F 16°C
Sunny
Mildly cool near 66°F 19°C, sunny through the afternoon, turning partly cloudy this evening, with steady humidity and steady pressure. Winds shifting from the E to the NNE at 8 mph 13 km/h.
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