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As of 13:07 CDT

Weather in Summum, IL

85°Current weather

Summum, Saturday, 8 August, 13:07

Mostly clear. Feels like 91°. High 86°, low 70°.

Pressure30.03 inHg
Wind6.4 mph N
Humidity64%
Visibility6.2 mi
Dew point71°
Sun, 0994° / 68°0Partly cloudy
94 °Partly cloudy

Summum, Sunday, 9 August

Partly cloudy. High 94°, low 68°.

Pressure29.91 inHg
Wind15.5 mph S
Humidity48%
Visibility6.2 mi
Dew point70°
Mon, 1098° / 76°0Overcast
98 °Overcast

Summum, Monday, 10 August

Overcast. High 98°, low 76°.

Pressure29.88 inHg
Wind10.4 mph SW
Humidity51%
Visibility6.2 mi
Dew point68°
Tue, 1198° / 72°0.03Light rain
98 °Light rain

Summum, Tuesday, 11 August

Light rain. High 98°, low 72°.

Pressure29.80 inHg
Wind17.8 mph SW
Humidity38%
Visibility6.2 mi
Dew point66°
Wed, 1284° / 72°0.23Light rain
84 °Light rain

Summum, Wednesday, 12 August

Light rain. High 84°, low 72°.

Pressure29.85 inHg
Wind4.5 mph N
Humidity67%
Visibility6.2 mi
Dew point70°
Thu, 1374° / 62°0.79Heavy rain
74 °Heavy rain

Summum, Thursday, 13 August

Heavy rain. High 74°, low 62°.

Pressure29.91 inHg
Wind13.1 mph W
Humidity95%
Visibility—
Dew point66°
Fri, 1478° / 56°0Clear
78 °Clear

Summum, Friday, 14 August

Clear. High 78°, low 56°.

Pressure30.18 inHg
Wind5.5 mph N
Humidity44%
Visibility—
Dew point51°
Sat, 1581° / 58°0Overcast
81 °Overcast

Summum, Saturday, 15 August

Overcast. High 81°, low 58°.

Pressure30.18 inHg
Wind7.2 mph SE
Humidity47%
Visibility—
Dew point54°
Sun, 1668° / 64°0.32Rain
68 °Rain

Summum, Sunday, 16 August

Rain. High 68°, low 64°.

Pressure30.09 inHg
Wind10.9 mph E
Humidity99%
Visibility—
Dew point65°
Mon, 1778° / 66°0.01Light rain
78 °Light rain

Summum, Monday, 17 August

Light rain. High 78°, low 66°.

Pressure29.97 inHg
Wind8.9 mph E
Humidity89%
Visibility—
Dew point68°
Tue, 1889° / 67°0.02Light rain
89 °Light rain

Summum, Tuesday, 18 August

Light rain. High 89°, low 67°.

Pressure29.88 inHg
Wind11.5 mph W
Humidity58%
Visibility—
Dew point67°
Wed, 1979° / 62°0.02Light rain
79 °Light rain

Summum, Wednesday, 19 August

Light rain. High 79°, low 62°.

Pressure29.97 inHg
Wind13.9 mph NW
Humidity64%
Visibility—
Dew point64°
Thu, 2071° / 51°0Partly cloudy
71 °Partly cloudy

Summum, Thursday, 20 August

Partly cloudy. High 71°, low 51°.

Pressure30.24 inHg
Wind12.2 mph N
Humidity42%
Visibility—
Dew point43°
Fri, 2175° / 50°0Clear
75 °Clear

Summum, Friday, 21 August

Clear. High 75°, low 50°.

Pressure30.24 inHg
Wind5.7 mph NE
Humidity38%
Visibility—
Dew point42°
Sat, 2279° / 52°0Clear
79 °Clear

Summum, Saturday, 22 August

Clear. High 79°, low 52°.

Pressure30.15 inHg
Wind5.9 mph SE
Humidity40%
Visibility—
Dew point48°
Sun, 2382° / 55°0Clear
82 °Clear

Summum, Sunday, 23 August

Clear. High 82°, low 55°.

Pressure30.09 inHg
Wind7.4 mph S
Humidity35%
Visibility—
Dew point47°

About the monthly outlook

How accurate is a 30-day forecast?

The first 16 days come from weather models — reliable for the first 3–5 days and progressively less so after that. Days 17 through 30 for Summum, IL are built from the climate normal, the 60-year average, so they show typical weather for those dates rather than a specific forecast.

What does "above normal" mean?

We compare the forecast against the climate normal for those exact calendar days, computed from 60 years of observations. The deviation shows how much the coming month differs from a typical one.

Where do the 66-year records come from?

They are real temperature extremes recorded in Summum, IL since 1960: the highest and lowest reading for each calendar date, with the year it happened.

How often is it updated?

The forecast portion refreshes every hour; the climate portion is based on long-term data and stays stable.