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Mercer IL Weather - Mostly Cloudy - 72°F
Mostly Cloudy
72°F
Updated 3:11 pm
Feels Like 59°F
Humidity 49%
Wind VRB 6 mph
Barometer  30.13 in
Dew Point 52°F
Mercer IL Weather - Mostly Cloudy - 22°C
Mostly Cloudy
22°C
Updated 3:11 pm
Feels Like 15°C
Humidity 49%
Wind VRB 10 km/h
Barometer  102 kPa
Dew Point 11°C
Mercer, IL Weather and Current Conditionsmercer il weather forecast

Mercer, IL Weather Forecast

Mercer Illinois WeatherMercer, Illinois Weather Weather Forecast
14 day API forecast for Mercer, Illinois. Note. The 7-day weather forecast for Mercer, 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.
Mercer, IL Weather Forecast Dated: 311 PM Sat Sep 26 2026
Expect a cool pattern with a mix of sun and clouds and occasional showers over the coming period. generally humid conditions and a stable pattern will dominate.

Saturday, September 26, 2026

Mid-Morning
Mercer Weather - 2026-09-26 - Morning - Overcast
55°F 13°C
Overcast
Mid-Afternoon
Mercer Weather - 2026-09-26 - Afternoon - Overcast
64°F 18°C
Overcast
Early-Evening
Mercer Weather - 2026-09-26 - Evening - Sunny
62°F 16°C
Sunny
Refreshing around 64°F 18°C, overcast through the afternoon, turning partly cloudy this evening, with steady humidity and steady pressure. Winds out of the SE at 8 mph 12 km/h.

Sunday, September 27, 2026

Mid-Morning
Mercer Weather - 2026-09-27 - Morning - Partly Cloudy
58°F 15°C
Partly Cloudy
Mid-Afternoon
Mercer Weather - 2026-09-27 - Afternoon - Sunny
71°F 22°C
Sunny
Early-Evening
Mercer Weather - 2026-09-27 - Evening - Sunny
66°F 19°C
Sunny
Comfortable with temperatures reaching 71°F 22°C, partly cloudy in the morning, becoming sunny through the afternoon and evening, with steady humidity and steady pressure.

Monday, September 28, 2026

Mid-Morning
Mercer Weather - 2026-09-28 - Morning - Sunny
57°F 14°C
Sunny
Mid-Afternoon
Mercer Weather - 2026-09-28 - Afternoon - Sunny
71°F 22°C
Sunny
Early-Evening
Mercer Weather - 2026-09-28 - Evening - Sunny
67°F 19°C
Sunny
Enjoyable around 71°F 22°C, sunny throughout the day, with steady humidity and barometric pressure falling.

Tuesday, September 29, 2026

Mid-Morning
Mercer Weather - 2026-09-29 - Morning - Overcast
63°F 17°C
Overcast
Mid-Afternoon
Mercer Weather - 2026-09-29 - Afternoon - Overcast
69°F 20°C
Overcast
Early-Evening
Mercer Weather - 2026-09-29 - Evening - Drizzle
66°F 19°C
Drizzle
Mild temperatures up to 69°F 20°C, drier conditions through late afternoon before showers move in, with steady humidity and steady pressure. Winds tapering down from SSE 11 mph 18 km/h to E 3 mph 4 km/h.

Wednesday, September 30, 2026

Mid-Morning
Mercer Weather - 2026-09-30 - Morning - Light Showers
64°F 18°C
Light Showers
Mid-Afternoon
Mercer Weather - 2026-09-30 - Afternoon - Light Showers
64°F 18°C
Light Showers
Early-Evening
Mercer Weather - 2026-09-30 - Evening - Light Showers
65°F 19°C
Light Showers
Refreshing around 64°F 18°C, persistent showers off and on through the day, with steady humidity and steady pressure. Winds moving from the SW to the SE at 9 mph 14 km/h. Gusts up to 21 mph 34 km/h.

Thursday, October 1, 2026

Mid-Morning
Mercer Weather - 2026-10-01 - Morning - Light Showers
67°F 19°C
Light Showers
Mid-Afternoon
Mercer Weather - 2026-10-01 - Afternoon - Heavy Rain Showers
68°F 20°C
Heavy Rain Showers
Early-Evening
Mercer Weather - 2026-10-01 - Evening - Scattered Showers
67°F 19°C
Scattered Showers
Pleasant near 68°F 20°C, locally heavy downpours at times, with steady humidity and steady pressure. Winds swinging from the SSW to the SSE at 9 mph 14 km/h. Gusts up to 20 mph 32 km/h.

Friday, October 2, 2026

Mid-Morning
Mercer Weather - 2026-10-02 - Morning - Light Showers
63°F 17°C
Light Showers
Mid-Afternoon
Mercer Weather - 2026-10-02 - Afternoon - Scattered Showers
61°F 16°C
Scattered Showers
Early-Evening
Mercer Weather - 2026-10-02 - Evening - Scattered Showers
60°F 16°C
Scattered Showers
Comfortable at 61°F 16°C, periods of heavy rain and gusty conditions, with steady humidity and barometric pressure rising. Winds blowing from the NE at 15 mph 23 km/h. Gusts up to 24 mph 38 km/h.

Saturday, October 3, 2026

Mid-Morning
Mercer Weather - 2026-10-03 - Morning - Light Fog
62°F 16°C
Light Fog
Mid-Afternoon
Mercer Weather - 2026-10-03 - Afternoon - Scattered Showers
72°F 22°C
Scattered Showers
Early-Evening
Mercer Weather - 2026-10-03 - Evening - Overcast
70°F 21°C
Overcast
Enjoyable around 72°F 22°C, scattered downpours possible, with steady humidity and steady pressure. Winds turning from the SSE to the W at 10 mph 16 km/h.

Sunday, October 4, 2026

Mid-Morning
Mercer Weather - 2026-10-04 - Morning - Overcast
48°F 9°C
Overcast
Mid-Afternoon
Mercer Weather - 2026-10-04 - Afternoon - Sunny
56°F 13°C
Sunny
Early-Evening
Mercer Weather - 2026-10-04 - Evening - Sunny
53°F 12°C
Sunny
Brisk around 56°F 13°C, overcast in the morning, sunny in the afternoon, and partly cloudy this evening, with steady humidity and steady pressure. Winds easing from NNW 16 mph 26 km/h to NNW 7 mph 12 km/h.

Monday, October 5, 2026

Mid-Morning
Mercer Weather - 2026-10-05 - Morning - Overcast
43°F 6°C
Overcast
Mid-Afternoon
Mercer Weather - 2026-10-05 - Afternoon - Cloudy
49°F 9°C
Cloudy
Early-Evening
Mercer Weather - 2026-10-05 - Evening - Sunny
46°F 8°C
Sunny
Cool and brisk at 49°F 9°C, partly cloudy throughout the day, with steady humidity and steady pressure. Winds moving from the N to the NNW at 8 mph 13 km/h.

Tuesday, October 6, 2026

Mid-Morning
Mercer Weather - 2026-10-06 - Morning - Partly Cloudy
42°F 6°C
Partly Cloudy
Mid-Afternoon
Mercer Weather - 2026-10-06 - Afternoon - Sunny
47°F 9°C
Sunny
Early-Evening
Mercer Weather - 2026-10-06 - Evening - Sunny
43°F 6°C
Sunny
Chilly near 47°F 9°C, partly cloudy in the morning, becoming sunny through the afternoon and evening, with steady humidity and steady pressure. Winds NNW at 12 mph 19 km/h.

Wednesday, October 7, 2026

Mid-Morning
Mercer Weather - 2026-10-07 - Morning - Sunny
38°F 4°C
Sunny
Mid-Afternoon
Mercer Weather - 2026-10-07 - Afternoon - Sunny
46°F 8°C
Sunny
Early-Evening
Mercer Weather - 2026-10-07 - Evening - Cloudy
43°F 6°C
Cloudy
Crisp with a high near 46°F 8°C, sunny in the morning, partly cloudy in the afternoon, and sunny this evening, with steady humidity and steady pressure. Winds shifting from the NNE to the N at 6 mph 9 km/h.

Thursday, October 8, 2026

Mid-Morning
Mercer Weather - 2026-10-08 - Morning - Sunny
40°F 4°C
Sunny
Mid-Afternoon
Mercer Weather - 2026-10-08 - Afternoon - Sunny
50°F 10°C
Sunny
Early-Evening
Mercer Weather - 2026-10-08 - Evening - Sunny
46°F 8°C
Sunny
Brisk around 50°F 10°C, sunny throughout the day, with steady humidity and barometric pressure falling. Winds turning from the SW to the SSW at 8 mph 13 km/h.

Friday, October 9, 2026

Mid-Morning
Mercer Weather - 2026-10-09 - Morning - Overcast
46°F 8°C
Overcast
Mid-Afternoon
Mercer Weather - 2026-10-09 - Afternoon - Sunny
58°F 14°C
Sunny
Early-Evening
Mercer Weather - 2026-10-09 - Evening - Sunny
54°F 12°C
Sunny
Mildly cool near 58°F 14°C, cloudy in the morning, sunny in the afternoon, and partly cloudy this evening, with increasing humidity and steady pressure. Winds switching from the SW to the NE at 4 mph 6 km/h.

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Weather by the Numbers

Sat, 26th
Mercer IL Weather - Saturday, Sep 26, 2026 - Overcast
Hi: 64°F 18°C
Lo: 55°F 13°C
Sunrise 06:55 AM
Sunset 06:53 PM
Wind SE 9 mph14 km/h
Dew Point 49°F9°C
uv Index 1
Barometric Pressure 30.18 in1022 mb
POP 16% *
Humidity 64%
Sun, 27th
Mercer IL Weather - Sunday, Sep 27, 2026 - Overcast
Hi: 71°F 22°C
Lo: 56°F 13°C
Sunrise 06:56 AM
Sunset 06:51 PM
Wind ESE 6 mph10 km/h
Dew Point 50°F10°C
uv Index 2
Barometric Pressure 30.09 in1019 mb
POP 12% *
Humidity 56%
Mon, 28th
Mercer IL Weather - Monday, Sep 28, 2026 - Sunny
Hi: 71°F 22°C
Lo: 55°F 13°C
Sunrise 06:57 AM
Sunset 06:50 PM
Wind ESE 7 mph11 km/h
Dew Point 48°F9°C
uv Index 2
Barometric Pressure 30.09 in1019 mb
POP 2% *
Humidity 49%
Tue, 29th
Mercer IL Weather - Tuesday, Sep 29, 2026 - Overcast
Hi: 70°F 21°C
Lo: 60°F 15°C
Sunrise 06:58 AM
Sunset 06:48 PM
Wind SSE 11 mph18 km/h
Dew Point 54°F12°C
uv Index 1
Barometric Pressure 29.94 in1014 mb
POP 17% *
Humidity 66%
Wed, 30th
Mercer IL Weather - Wednesday, Sep 30, 2026 - Light Rain Shower
Hi: 66°F 19°C
Lo: 62°F 16°C
Sunrise 06:59 AM
Sunset 06:46 PM
Wind WSW 4 mph6 km/h
Dew Point 64°F18°C
uv Index 4
Barometric Pressure 29.83 in1010 mb
POP 71% *
Humidity 98%
Thu, 1st
Mercer IL Weather - Thursday, Oct 1, 2026 - Light Rain Shower
Hi: 69°F 21°C
Lo: 66°F 19°C
Sunrise 07:00 AM
Sunset 06:45 PM
Wind SSW 12 mph19 km/h
Dew Point 66°F19°C
uv Index 5
Barometric Pressure 29.83 in1010 mb
POP 81% *
Humidity 92%
Fri, 2nd
Mercer IL Weather - Friday, Oct 2, 2026 - Patchy Rain Nearby
Hi: 68°F 20°C
Lo: 58°F 15°C
Sunrise 07:01 AM
Sunset 06:43 PM
Wind NE 15 mph23 km/h
Dew Point 60°F15°C
uv Index 4
Barometric Pressure 29.88 in1012 mb
POP 30% *
Humidity 91%
Sat, 3rd
Mercer IL Weather - Saturday, Oct 3, 2026 - Overcast
Hi: 73°F 23°C
Lo: 58°F 14°C
Sunrise 07:02 AM
Sunset 06:41 PM
Wind SSW 9 mph15 km/h
Dew Point 60°F16°C
uv Index 4
Barometric Pressure 29.88 in1012 mb
POP 24% *
Humidity 80%
Sun, 4th
Mercer IL Weather - Sunday, Oct 4, 2026 - Overcast
Hi: 56°F 13°C
Lo: 44°F 7°C
Sunrise 07:03 AM
Sunset 06:39 PM
Wind NNW 14 mph23 km/h
Dew Point 41°F5°C
uv Index 3
Barometric Pressure 30.21 in1023 mb
POP 7% *
Humidity 63%
Mon, 5th
Mercer IL Weather - Monday, Oct 5, 2026 - Sunny
Hi: 49°F 9°C
Lo: 40°F 5°C
Sunrise 07:04 AM
Sunset 06:38 PM
Wind NNW 13 mph20 km/h
Dew Point 29°F-2°C
uv Index 3
Barometric Pressure 30.47 in1032 mb
POP 6% *
Humidity 50%
Tue, 6th
Mercer IL Weather - Tuesday, Oct 6, 2026 - Partly Cloudy
Hi: 48°F 9°C
Lo: 38°F 3°C
Sunrise 07:05 AM
Sunset 06:36 PM
Wind NNW 11 mph18 km/h
Dew Point 28°F-2°C
uv Index 3
Barometric Pressure 30.47 in1032 mb
POP 3% *
Humidity 48%
Wed, 7th
Mercer IL Weather - Wednesday, Oct 7, 2026 - Sunny
Hi: 47°F 8°C
Lo: 34°F 1°C
Sunrise 07:06 AM
Sunset 06:35 PM
Wind NNE 9 mph15 km/h
Dew Point 23°F-5°C
uv Index 3
Barometric Pressure 30.53 in1034 mb
POP 1% *
Humidity 44%
Thu, 8th
Mercer IL Weather - Thursday, Oct 8, 2026 - Sunny
Hi: 51°F 10°C
Lo: 35°F 2°C
Sunrise 07:07 AM
Sunset 06:33 PM
Wind SW 9 mph14 km/h
Dew Point 29°F-2°C
uv Index 3
Barometric Pressure 30.42 in1030 mb
POP 2% *
Humidity 51%
Fri, 9th
Mercer IL Weather - Friday, Oct 9, 2026 - Cloudy
Hi: 58°F 15°C
Lo: 41°F 5°C
Sunrise 07:08 AM
Sunset 06:31 PM
Wind WSW 7 mph12 km/h
Dew Point 34°F1°C
uv Index 3
Barometric Pressure 30.18 in1022 mb
POP 3% *
Humidity 48%
* POP = Probability of Precipitation. Data for 12:00 PM.