10-day forecast for South Jacksonville, IL: 66° to 102°, with precipitation expected on 4 days. The table below breaks each day into morning, afternoon, evening and overnight.
102°
Best day: Saturday, August 15
91° · 1.23 in
Worst day: Wednesday, August 12
Tap any day below to see morning, afternoon, evening and overnight.
Mon, 1098° / 74°0.01
Morning78°feels 79°
Afternoon97°feels 100°
Evening88°feels 92°
Overnight82°feels 85°
98 °
South Jacksonville, Monday, 10 August
Light rain. High 98°, low 74°.
Pressure29.91 inHg
Wind13.1 mph SW
Humidity41%
Visibility6.2 mi
Dew point67°
Tue, 11102° / 76°0.05
Morning76°feels 77°
Afternoon98°feels 103°
Evening91°feels 93°
Overnight81°feels 82°
102 °
South Jacksonville, Tuesday, 11 August
Light rain. High 102°, low 76°.
Pressure29.83 inHg
Wind16.1 mph SW
Humidity38%
Visibility6.2 mi
Dew point67°
Wed, 1291° / 70°1.23
Morning77°feels 79°
Afternoon92°feels 102°
Evening73°feels 74°
Overnight82°feels 84°
91 °
South Jacksonville, Wednesday, 12 August
Heavy rain. High 91°, low 70°.
Pressure29.85 inHg
Wind7.4 mph SE
Humidity60%
Visibility6.2 mi
Dew point73°
Thu, 1388° / 68°0.1
Morning72°feels 73°
Afternoon83°feels 89°
Evening81°feels 88°
Overnight69°feels 70°
88 °
South Jacksonville, Thursday, 13 August
Light rain. High 88°, low 68°.
Pressure29.91 inHg
Wind11.1 mph S
Humidity73%
Visibility6.2 mi
Dew point72°
Fri, 1490° / 72°0
Morning77°feels 81°
Afternoon89°feels 98°
Evening85°feels 94°
Overnight80°feels 85°
90 °
South Jacksonville, Friday, 14 August
Overcast. High 90°, low 72°.
Pressure29.91 inHg
Wind11.8 mph SE
Humidity58%
Visibility—
Dew point71°
Sat, 15102° / 74°0.01
Morning82°feels 83°
Afternoon100°feels 102°
Evening90°feels 95°
Overnight84°feels 86°
102 °
South Jacksonville, Saturday, 15 August
Light rain. High 102°, low 74°.
Pressure29.91 inHg
Wind14 mph S
Humidity28%
Visibility—
Dew point59°
Sun, 1690° / 74°0
Morning78°feels 80°
Afternoon85°feels 89°
Evening80°feels 82°
Overnight75°feels 76°
90 °
South Jacksonville, Sunday, 16 August
Partly cloudy. High 90°, low 74°.
Pressure29.97 inHg
Wind16.6 mph SW
Humidity56%
Visibility—
Dew point67°
Mon, 1791° / 66°0.08
Morning73°feels 75°
Afternoon86°feels 92°
Evening86°feels 95°
Overnight82°feels 86°
91 °
South Jacksonville, Monday, 17 August
Light rain. High 91°, low 66°.
Pressure29.94 inHg
Wind18.1 mph SE
Humidity63%
Visibility—
Dew point69°
Tue, 1897° / 76°0
Morning81°feels 82°
Afternoon93°feels 97°
Evening86°feels 86°
Overnight79°feels 79°
97 °
South Jacksonville, Tuesday, 18 August
Overcast. High 97°, low 76°.
Pressure29.88 inHg
Wind15.8 mph S
Humidity44%
Visibility—
Dew point66°
About this forecast
How reliable is a 10-day forecast?
The first 3–5 days are the most reliable, typically within 2–4°. From day six to ten the models show the trend: the direction of change is right more often than the exact numbers.
What does the time-of-day table show?
Temperature in South Jacksonville, IL around 8am, 2pm, 8pm and 2am each day — handy for planning a walk, a drive or work outdoors.
How is the best day chosen?
We weigh the daytime high against precipitation: a warm, dry day scores highest.