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St. Augustine IL Weather - Clear - 74°F
Clear
74°F
Updated 1:16 am
Feels Like 80°F
Humidity 100%
Wind N 0 mph
Barometer  29.95 in
Dew Point 75°F
St. Augustine IL Weather - Clear - 24°C
Clear
24°C
Updated 1:16 am
Feels Like 27°C
Humidity 100%
Wind N 0 km/h
Barometer  101.4 kPa
Dew Point 24°C
St. Augustine, IL Weather and Current Conditionsst. augustine il weather forecast

St. Augustine, IL Weather Forecast

St. Augustine Illinois WeatherSt. Augustine, Illinois Weather Weather Forecast
Here is the API 14 day weather forecast for St. Augustine, Illinois. Note: The 7-day weather forecast for St. Augustine, IL is the most reliable and accurate weather forecast. This template should only be used as a probable scenario. Forecasting weather beyond the next 7 days is a challenge.
St. Augustine, IL Weather Forecast Dated: 116 AM Sat Sep 05 2026
Expect a very warm period with a mix of sun and clouds and mostly dry weather over the coming period. moderate humidity and no major pressure swings will dominate.

Saturday, September 5, 2026

Mid-Morning
St. Augustine Weather - 2026-09-05 - Morning - Overcast
82°F 28°C
Overcast
Mid-Afternoon
St. Augustine Weather - 2026-09-05 - Afternoon - Sunny
89°F 32°C
Sunny
Early-Evening
St. Augustine Weather - 2026-09-05 - Evening - Sunny
81°F 27°C
Sunny
Warm and summery around 89°F 32°C (feels like 96°F 36°C), overcast in the morning, becoming sunny through the afternoon and evening, with steady humidity and steady pressure. Winds turning from the WNW to the ENE at 11 mph 18 km/h.

Sunday, September 6, 2026

Mid-Morning
St. Augustine Weather - 2026-09-06 - Morning - Sunny
71°F 22°C
Sunny
Mid-Afternoon
St. Augustine Weather - 2026-09-06 - Afternoon - Overcast
83°F 28°C
Overcast
Early-Evening
St. Augustine Weather - 2026-09-06 - Evening - Sunny
75°F 24°C
Sunny
Balmy with temperatures reaching 83°F 28°C, sunny in the morning, overcast in the afternoon, and cloudy this evening, with lower humidity and steady pressure. Winds blowing from the E at 11 mph 18 km/h. Gusts up to 24 mph 39 km/h.

Monday, September 7, 2026

Mid-Morning
St. Augustine Weather - 2026-09-07 - Morning - Sunny
66°F 19°C
Sunny
Mid-Afternoon
St. Augustine Weather - 2026-09-07 - Afternoon - Sunny
83°F 28°C
Sunny
Early-Evening
St. Augustine Weather - 2026-09-07 - Evening - Sunny
77°F 25°C
Sunny
Quite warm around 83°F 28°C, sunny through the afternoon, turning partly cloudy this evening, with lower humidity and steady pressure. Winds ESE at 9 mph 14 km/h. Gusts up to 24 mph 38 km/h.

Tuesday, September 8, 2026

Mid-Morning
St. Augustine Weather - 2026-09-08 - Morning - Overcast
69°F 21°C
Overcast
Mid-Afternoon
St. Augustine Weather - 2026-09-08 - Afternoon - Overcast
95°F 35°C
Overcast
Early-Evening
St. Augustine Weather - 2026-09-08 - Evening - Sunny
92°F 33°C
Sunny
Hot temperatures near 95°F 35°C, overcast through the afternoon, turning sunny this evening, with lower humidity and barometric pressure falling. Winds swinging from the S to the SSE at 11 mph 19 km/h. Gusts up to 23 mph 37 km/h.

Wednesday, September 9, 2026

Mid-Morning
St. Augustine Weather - 2026-09-09 - Morning - Sunny
74°F 23°C
Sunny
Mid-Afternoon
St. Augustine Weather - 2026-09-09 - Afternoon - Partly Cloudy
85°F 29°C
Partly Cloudy
Early-Evening
St. Augustine Weather - 2026-09-09 - Evening - Cloudy
78°F 26°C
Cloudy
Very warm with a high of 85°F 29°C, sunny in the morning, cloudy in the afternoon, and overcast this evening, with lower humidity and steady pressure. Winds shifting from the NW to the ESE at 7 mph 12 km/h.

Thursday, September 10, 2026

Mid-Morning
St. Augustine Weather - 2026-09-10 - Morning - Overcast
67°F 19°C
Overcast
Mid-Afternoon
St. Augustine Weather - 2026-09-10 - Afternoon - Overcast
78°F 26°C
Overcast
Early-Evening
St. Augustine Weather - 2026-09-10 - Evening - Partly Cloudy
72°F 23°C
Partly Cloudy
Pleasant near 78°F 26°C, overcast in the morning, cloudy in the afternoon, and partly cloudy this evening, with steady humidity and steady pressure. Winds turning from the NE to the ENE at 8 mph 12 km/h.

Friday, September 11, 2026

Mid-Morning
St. Augustine Weather - 2026-09-11 - Morning - Overcast
66°F 19°C
Overcast
Mid-Afternoon
St. Augustine Weather - 2026-09-11 - Afternoon - Partly Cloudy
81°F 27°C
Partly Cloudy
Early-Evening
St. Augustine Weather - 2026-09-11 - Evening - Overcast
78°F 26°C
Overcast
Balmy with temperatures reaching 81°F 27°C, overcast through the afternoon, turning partly cloudy this evening, with steady humidity and barometric pressure falling. Winds out of the SSE at 8 mph 12 km/h.

Saturday, September 12, 2026

Mid-Morning
St. Augustine Weather - 2026-09-12 - Morning - Cloudy
73°F 23°C
Cloudy
Mid-Afternoon
St. Augustine Weather - 2026-09-12 - Afternoon - Partly Cloudy
94°F 35°C
Partly Cloudy
Early-Evening
St. Augustine Weather - 2026-09-12 - Evening - Sunny
92°F 34°C
Sunny
Hot and sweltering around 94°F 35°C (heat index 97°F 36°C), partly cloudy through the afternoon, turning sunny this evening, with lower humidity and steady pressure. Winds moving from the SSE to the S at 15 mph 24 km/h. Gusts up to 30 mph 47 km/h.

Sunday, September 13, 2026

Mid-Morning
St. Augustine Weather - 2026-09-13 - Morning - Sunny
85°F 29°C
Sunny
Mid-Afternoon
St. Augustine Weather - 2026-09-13 - Afternoon - Sunny
99°F 37°C
Sunny
Early-Evening
St. Augustine Weather - 2026-09-13 - Evening - Partly Cloudy
95°F 35°C
Partly Cloudy
Hot temperatures near 99°F 37°C, sunny in the morning, partly cloudy in the afternoon, and cloudy this evening, with lower humidity and steady pressure. Winds swinging from the SSW to the S at 11 mph 18 km/h. Gusts up to 22 mph 35 km/h.

Monday, September 14, 2026

Mid-Morning
St. Augustine Weather - 2026-09-14 - Morning - Sunny
83°F 28°C
Sunny
Mid-Afternoon
St. Augustine Weather - 2026-09-14 - Afternoon - Sunny
96°F 36°C
Sunny
Early-Evening
St. Augustine Weather - 2026-09-14 - Evening - Cloudy
92°F 34°C
Cloudy
Sizzling hot near 96°F 36°C with a heat index reaching 99°F 37°C, sunny in the morning, partly cloudy in the afternoon, and overcast this evening, with lower humidity and steady pressure. Winds shifting from the SSW to the S at 13 mph 21 km/h. Gusts up to 26 mph 41 km/h.

Tuesday, September 15, 2026

Mid-Morning
St. Augustine Weather - 2026-09-15 - Morning - Partly Cloudy
83°F 28°C
Partly Cloudy
Mid-Afternoon
St. Augustine Weather - 2026-09-15 - Afternoon - Partly Cloudy
95°F 35°C
Partly Cloudy
Early-Evening
St. Augustine Weather - 2026-09-15 - Evening - Sunny
90°F 33°C
Sunny
Very hot with temperatures reaching 95°F 35°C, overcast in the morning, becoming sunny through the afternoon and evening, with lower humidity and steady pressure. Winds turning from the S to the SSE at 15 mph 23 km/h. Gusts up to 27 mph 44 km/h.

Wednesday, September 16, 2026

Mid-Morning
St. Augustine Weather - 2026-09-16 - Morning - Sunny
80°F 26°C
Sunny
Mid-Afternoon
St. Augustine Weather - 2026-09-16 - Afternoon - Partly Cloudy
96°F 35°C
Partly Cloudy
Early-Evening
St. Augustine Weather - 2026-09-16 - Evening - Partly Cloudy
92°F 34°C
Partly Cloudy
Hot and sweltering around 96°F 35°C, sunny in the morning, cloudy in the afternoon, and overcast this evening, with lower humidity and barometric pressure falling. Winds SW at 11 mph 18 km/h. Gusts up to 23 mph 36 km/h.

Thursday, September 17, 2026

Mid-Morning
St. Augustine Weather - 2026-09-17 - Morning - Overcast
66°F 19°C
Overcast
Mid-Afternoon
St. Augustine Weather - 2026-09-17 - Afternoon - Sunny
77°F 25°C
Sunny
Early-Evening
St. Augustine Weather - 2026-09-17 - Evening - Partly Cloudy
69°F 21°C
Partly Cloudy
Enjoyable around 77°F 25°C, overcast in the morning, becoming partly cloudy through the afternoon and evening, with lower humidity and steady pressure. Winds moving from the N to the NNW at 9 mph 15 km/h.

Friday, September 18, 2026

Mid-Morning
St. Augustine Weather - 2026-09-18 - Morning - Sunny
54°F 12°C
Sunny
Mid-Afternoon
St. Augustine Weather - 2026-09-18 - Afternoon - Sunny
65°F 19°C
Sunny
Early-Evening
St. Augustine Weather - 2026-09-18 - Evening - Overcast
60°F 15°C
Overcast
Mildly cool near 65°F 19°C, sunny in the morning, becoming cloudy through the afternoon and evening, with steady humidity and steady pressure. Winds swinging from the ESE to the N at 10 mph 16 km/h.

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Weather by the Numbers

Sat, 5th
St. Augustine IL Weather - Saturday, Sep 5, 2026 - Overcast
Hi: 89°F 32°C
Lo: 73°F 23°C
Sunrise 06:33 AM
Sunset 07:27 PM
Wind NNE 8 mph13 km/h
Dew Point 69°F20°C
uv Index 7
Barometric Pressure 29.91 in1013 mb
POP 12% *
Humidity 54%
Sun, 6th
St. Augustine IL Weather - Sunday, Sep 6, 2026 - Partly Cloudy
Hi: 83°F 28°C
Lo: 65°F 18°C
Sunrise 06:34 AM
Sunset 07:26 PM
Wind ESE 11 mph18 km/h
Dew Point 62°F17°C
uv Index 7
Barometric Pressure 30.06 in1018 mb
POP 7% *
Humidity 55%
Mon, 7th
St. Augustine IL Weather - Monday, Sep 7, 2026 - Sunny
Hi: 83°F 29°C
Lo: 61°F 16°C
Sunrise 06:35 AM
Sunset 07:24 PM
Wind ESE 10 mph16 km/h
Dew Point 54°F12°C
uv Index 7
Barometric Pressure 30.12 in1020 mb
POP 1% *
Humidity 45%
Tue, 8th
St. Augustine IL Weather - Tuesday, Sep 8, 2026 - Overcast
Hi: 96°F 36°C
Lo: 63°F 17°C
Sunrise 06:36 AM
Sunset 07:22 PM
Wind SSW 11 mph18 km/h
Dew Point 53°F12°C
uv Index 7
Barometric Pressure 30.03 in1017 mb
POP 9% *
Humidity 32%
Wed, 9th
St. Augustine IL Weather - Wednesday, Sep 9, 2026 - Partly Cloudy
Hi: 87°F 31°C
Lo: 70°F 21°C
Sunrise 06:36 AM
Sunset 07:21 PM
Wind N 12 mph19 km/h
Dew Point 59°F15°C
uv Index 7
Barometric Pressure 30.09 in1019 mb
POP 3% *
Humidity 46%
Thu, 10th
St. Augustine IL Weather - Thursday, Sep 10, 2026 - Overcast
Hi: 79°F 26°C
Lo: 62°F 17°C
Sunrise 06:37 AM
Sunset 07:19 PM
Wind ENE 5 mph8 km/h
Dew Point 49°F10°C
uv Index 5
Barometric Pressure 30.15 in1021 mb
POP 10% *
Humidity 41%
Fri, 11th
St. Augustine IL Weather - Friday, Sep 11, 2026 - Overcast
Hi: 82°F 28°C
Lo: 61°F 16°C
Sunrise 06:38 AM
Sunset 07:17 PM
Wind SE 11 mph18 km/h
Dew Point 57°F14°C
uv Index 5
Barometric Pressure 30.06 in1018 mb
POP 7% *
Humidity 52%
Sat, 12th
St. Augustine IL Weather - Saturday, Sep 12, 2026 - Sunny
Hi: 96°F 36°C
Lo: 66°F 19°C
Sunrise 06:39 AM
Sunset 07:16 PM
Wind S 17 mph27 km/h
Dew Point 60°F16°C
uv Index 7
Barometric Pressure 29.91 in1013 mb
POP 3% *
Humidity 43%
Sun, 13th
St. Augustine IL Weather - Sunday, Sep 13, 2026 - Sunny
Hi: 99°F 37°C
Lo: 78°F 25°C
Sunrise 06:40 AM
Sunset 07:14 PM
Wind SSW 15 mph24 km/h
Dew Point 61°F16°C
uv Index 8
Barometric Pressure 29.94 in1014 mb
POP 1% *
Humidity 33%
Mon, 14th
St. Augustine IL Weather - Monday, Sep 14, 2026 - Sunny
Hi: 96°F 36°C
Lo: 77°F 25°C
Sunrise 06:41 AM
Sunset 07:12 PM
Wind SSW 14 mph22 km/h
Dew Point 64°F18°C
uv Index 8
Barometric Pressure 30.03 in1017 mb
POP 1% *
Humidity 39%
Tue, 15th
St. Augustine IL Weather - Tuesday, Sep 15, 2026 - Overcast
Hi: 96°F 35°C
Lo: 77°F 25°C
Sunrise 06:42 AM
Sunset 07:11 PM
Wind S 14 mph23 km/h
Dew Point 63°F17°C
uv Index 7
Barometric Pressure 30.09 in1019 mb
POP 4% *
Humidity 39%
Wed, 16th
St. Augustine IL Weather - Wednesday, Sep 16, 2026 - Sunny
Hi: 97°F 36°C
Lo: 71°F 22°C
Sunrise 06:43 AM
Sunset 07:09 PM
Wind SW 12 mph19 km/h
Dew Point 56°F13°C
uv Index 8
Barometric Pressure 30.06 in1018 mb
POP 2% *
Humidity 32%
Thu, 17th
St. Augustine IL Weather - Thursday, Sep 17, 2026 - Overcast
Hi: 78°F 26°C
Lo: 62°F 17°C
Sunrise 06:44 AM
Sunset 07:07 PM
Wind N 13 mph21 km/h
Dew Point 45°F7°C
uv Index 5
Barometric Pressure 30.24 in1024 mb
POP 4% *
Humidity 39%
Fri, 18th
St. Augustine IL Weather - Friday, Sep 18, 2026 - Sunny
Hi: 66°F 19°C
Lo: 50°F 10°C
Sunrise 06:45 AM
Sunset 07:06 PM
Wind WSW 14 mph23 km/h
Dew Point 36°F2°C
uv Index 5
Barometric Pressure 30.45 in1031 mb
POP 1% *
Humidity 39%
* POP = Probability of Precipitation. Data for 12:00 PM.