Saint Augustine, IL Weather Tomorrow

Saint Augustine weather tomorrow and 5 day forecast with this week's outlook featuring precipitation chances, day and night conditions, high and low temperatures in Fahrenheit and Celsius, sunrise, sunset, sky conditions, wind chill, and wind speed with direction for the Saint Augustine area and around Knox county, Illinois.
Updated: Fri Oct 9th 2026 5:45 AM CDT
Saint Augustine, IL Weather – 10-9 – Sunny
81° / 58°
Sunny
Saint Augustine could see sunshine with daytime highs of 81°F and nighttime lows near 58°F. There's a moderate 36% chance of rainfall with an estimated 0.02in. Wind will be moderate, blowing around 12mph on average and gusts of 25.6mph at 10 PM. Humidity levels should be comfortable, sitting around 51% on average, the maximum being 63% at 9 AM and 37% being its lowest at 1 PM. Barometric pressure is its highest of 30.1inHg at 7 AM, a lowest point of 29.96inHg at 5 PM with an avg 30.02inHg.
Saint Augustine, IL Weather – 10-10 – Overcast
79° / 60°

Weather Tomorrow

Overcast
Cloud-filled skies are in the forecast for Saint Augustine, with a high of 79°F and a low of 60°F. There's a very small chance of rainfall, only about 8%. Wind will be moderate, blowing around 15mph on average and gusts of 30.5mph at 2 AM. Humidity levels should be comfortable, sitting around 49% on average, the maximum being 61% at 11 PM and 40% being its lowest at 12 AM. Barometric pressure is its highest of 30.08inHg at 10 AM, a lowest point of 29.98inHg at 5 PM with an avg 30.02inHg.
Saint Augustine, IL Weather – 10-11 – Sunny
78° / 56°
Sunny
Daytime highs will reach 78°F with lows dropping to 56°F in Saint Augustine, where it will be sunny. There's a very small chance of rainfall, only about 7%. Winds will be light at 9mph and gusts of 16.6mph at 11 PM. The humidity will be on the higher side, averaging about 68%, the maximum being 94% at 7 AM and 47% being its lowest at 4 PM. Barometric pressure is its highest of 30inHg at 9 AM, a lowest point of 29.9inHg at 5 PM with an avg 29.95inHg.
Saint Augustine, IL Weather – 10-12 – Sunny
87° / 63°
Sunny
Highs will reach 87°F with lows near 63°F in Saint Augustine, where a sunny day is. There's a very small chance of rainfall, only about 6%. Wind will be moderate, blowing around 16mph on average and gusts of 28.9mph at 11 PM. Humidity levels should be comfortable, sitting around 60% on average, the maximum being 69% at 8 AM and 43% being its lowest at 3 PM. Barometric pressure is its highest of 29.92inHg at 2 AM, a lowest point of 29.74inHg at 6 PM with an avg 29.83inHg.
Saint Augustine, IL Weather – 10-13 – Sunny
74° / 62°
Sunny
Bright and sunny conditions in Saint Augustine, with a high of 74°F and a low of 62°F. There's a very small chance of rainfall, only about 6%. Wind will be moderate, blowing around 13mph on average and gusts of 34.9mph at 2 AM. The humidity will be on the higher side, averaging about 68%, the maximum being 94% at 7 AM and 54% being its lowest at 4 PM. Barometric pressure is its highest of 30.02inHg at 11 PM, a lowest point of 29.76inHg at 1 AM with an avg 29.91inHg.
Saint Augustine, IL Weather – 10-14 – Overcast
62° / 57°
Overcast
Saint Augustine may see overcast, with daytime highs of 62°F and overnight lows near 57°F. Rainfall predicted to have a 66% chance with an estimated 0.05in. Wind will be moderate, blowing around 14mph on average and gusts of 24.4mph at 10 PM. The humidity will be on the higher side, averaging about 74%, the maximum being 86% at 11 PM and 62% being its lowest at 1 PM. Barometric pressure is its highest of 30.06inHg at 7 AM, a lowest point of 29.96inHg at 11 PM with an avg 30.02inHg.

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