Weather Alert
St. Marys Weather Warning NWS WEATHER ALERT FOR THE SAINT MARYS, IL AREA - Issued: 219 PM CDT Thu Oct 1 2026 St. Marys Weather Warning

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St. Marys, IL Weather - Hour by Hour Forecast

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St. Marys, IL Weather - Hour by Hour Forecast

24 Hour Forecast

Current Conditions - Heavy Rain. Temperature is 69°F21°C, dew point 67°F20°C, humidity 93%. Wind direction is NW at 7 mph11 km/h with visibility of 7 mi11 km. Barometric pressure is 29.98 in1015 mb.
Rest of Tonight - Showers with a slight chance of thunderstorms. Lows in the mid 60s. Northwest winds 5 to 10 mph with gusts up to 20 mph. Chance of.. Full Forecast
Friday - Mostly cloudy with a chance of showers in the morning, then partly sunny in the afternoon. Much cooler with highs in the upper 60s.. Full Forecast

St. Marys Hourly Weather

24 Hour Forecast Scroll
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St. Marys, IL Hourly Weather - Cloudy - 1:00 AM St. Marys, IL Hourly Weather - Cloudy - 2:00 AM St. Marys, IL Hourly Weather - Cloudy - 3:00 AM St. Marys, IL Hourly Weather - Cloudy - 4:00 AM St. Marys, IL Hourly Weather - Cloudy - 5:00 AM St. Marys, IL Hourly Weather - Cloudy - 6:00 AM St. Marys, IL Hourly Weather - Cloudy - 7:00 AM St. Marys, IL Hourly Weather - Cloudy - 8:00 AM St. Marys, IL Hourly Weather - Cloudy - 9:00 AM St. Marys, IL Hourly Weather - Cloudy - 10:00 AM St. Marys, IL Hourly Weather - Cloudy - 11:00 AM St. Marys, IL Hourly Weather - Cloudy - 12:00 PM St. Marys, IL Hourly Weather - Cloudy - 1:00 PM St. Marys, IL Hourly Weather - Cloudy - 2:00 PM St. Marys, IL Hourly Weather - Cloudy - 3:00 PM St. Marys, IL Hourly Weather - Cloudy - 4:00 PM St. Marys, IL Hourly Weather - Cloudy - 5:00 PM St. Marys, IL Hourly Weather - Partly Cloudy - 6:00 PM St. Marys, IL Hourly Weather - Partly Cloudy - 7:00 PM St. Marys, IL Hourly Weather - Partly Cloudy - 8:00 PM St. Marys, IL Hourly Weather - Clear - 9:00 PM St. Marys, IL Hourly Weather - Clear - 10:00 PM St. Marys, IL Hourly Weather - Clear - 11:00 PM St. Marys, IL Hourly Weather - Clear - 12:00 AM
Cloudy Cloudy Cloudy Cloudy Cloudy Cloudy Cloudy Cloudy Cloudy Cloudy Cloudy Cloudy Cloudy Cloudy Cloudy Cloudy Cloudy Partly Cloudy Partly Cloudy Partly Cloudy Clear Clear Clear Clear
73°F23°C 72°F22°C 70°F21°C 69°F21°C 68°F20°C 66°F19°C 65°F18°C 65°F18°C 64°F18°C 64°F18°C 64°F18°C 65°F18°C 65°F18°C 65°F18°C 65°F18°C 65°F18°C 64°F18°C 63°F17°C 62°F17°C 61°F16°C 59°F15°C 58°F14°C 57°F14°C 55°F13°C
Rain Rain Rain Rain Rain Rain Rain Rain Rain Rain Rain Rain Rain - - - - - - - - - - -
81% 81% 81% 81% 81% 81% 81% 62% 62% 62% 62% 62% 62% 7% 7% 7% 7% 7% 7% 6% 6% 6% 6% 6%
65°F18°C 64°F18°C 63°F17°C 62°F17°C 61°F16°C 61°F16°C 60°F16°C 59°F15°C 58°F14°C 57°F14°C 56°F13°C 55°F13°C 54°F12°C 53°F12°C 52°F11°C 51°F11°C 51°F11°C 50°F10°C 50°F10°C 49°F9°C 49°F9°C 48°F9°C 47°F8°C 47°F8°C
76% 76% 79% 78% 78% 84% 84% 81% 81% 78% 75% 70% 68% 65% 63% 61% 63% 63% 65% 65% 69% 69% 69% 74%
NW NW NW NW NW NW NW NNW NNW NNW NNW N N N N N N N N N N N SSW SE
7 mph 7 mph 6 mph 6 mph 6 mph 7 mph 7 mph 7 mph 8 mph 8 mph 8 mph 9 mph 9 mph 9 mph 9 mph 9 mph 9 mph 6 mph 6 mph 6 mph 6 mph 6 mph 6 mph 5 mph
10 mi16 km 6 mi10 km 6 mi10 km 5 mi8 km 5 mi8 km 5 mi8 km 5 mi8 km 5 mi8 km 6 mi10 km 6 mi10 km 6 mi10 km 10 mi16 km 10 mi16 km 10 mi16 km 10 mi16 km 10 mi16 km 10 mi16 km 10 mi16 km 10 mi16 km 10 mi16 km 10 mi16 km 10 mi16 km 10 mi16 km 10 mi16 km
Hour (CDT)
Weather
Clouds
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POP
Dewpoint
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POP = Probability of Precipitation. ** Indicates missing data/values from K1H2 model statistics.

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Prob Precip % = Probability of Precipitation.

St. Marys 36 Hour Forecast

POP = Probability of Precipitation. ** Indicates missing data/values from model statistics.

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