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As of 22:34 CDT

Weather in Grinnell, IL

71°Current weather

Grinnell, Saturday, 8 August, 22:34

Clear. Feels like 72°. High 88°, low 71°.

Pressure30.03 inHg
Wind6.8 mph S
Humidity90%
Visibility6.2 mi
Dew point68°
Sun, 0992° / 72°0Clear
92 °Clear

Grinnell, Sunday, 9 August

Clear. High 92°, low 72°.

Pressure30.03 inHg
Wind10 mph SW
Humidity57%
Visibility6.2 mi
Dew point71°
Mon, 1094° / 73°0Mostly clear
94 °Mostly clear

Grinnell, Monday, 10 August

Mostly clear. High 94°, low 73°.

Pressure30.03 inHg
Wind11.9 mph SW
Humidity51%
Visibility6.2 mi
Dew point70°
Tue, 1197° / 75°0Mostly clear
97 °Mostly clear

Grinnell, Tuesday, 11 August

Mostly clear. High 97°, low 75°.

Pressure29.94 inHg
Wind13.3 mph SW
Humidity45%
Visibility6.2 mi
Dew point70°
Wed, 1290° / 73°0.14Light rain
90 °Light rain

Grinnell, Wednesday, 12 August

Light rain. High 90°, low 73°.

Pressure29.88 inHg
Wind4.9 mph W
Humidity64%
Visibility6.2 mi
Dew point72°
Thu, 1386° / 72°0.27Rain
86 °Rain

Grinnell, Thursday, 13 August

Rain. High 86°, low 72°.

Pressure29.94 inHg
Wind13.2 mph E
Humidity93%
Visibility—
Dew point73°
Fri, 1489° / 70°1.25Heavy rain
89 °Heavy rain

Grinnell, Friday, 14 August

Heavy rain. High 89°, low 70°.

Pressure29.97 inHg
Wind11.5 mph NE
Humidity64%
Visibility—
Dew point72°
Sat, 1578° / 68°0.15Light rain
78 °Light rain

Grinnell, Saturday, 15 August

Light rain. High 78°, low 68°.

Pressure30.18 inHg
Wind10.5 mph E
Humidity84%
Visibility—
Dew point69°
Sun, 1693° / 69°0.04Light rain
93 °Light rain

Grinnell, Sunday, 16 August

Light rain. High 93°, low 69°.

Pressure30.03 inHg
Wind8.6 mph W
Humidity54%
Visibility—
Dew point70°
Mon, 1789° / 73°0.06Light rain
89 °Light rain

Grinnell, Monday, 17 August

Light rain. High 89°, low 73°.

Pressure30.03 inHg
Wind7.3 mph NE
Humidity75%
Visibility—
Dew point73°
Tue, 1891° / 72°0.15Light rain
91 °Light rain

Grinnell, Tuesday, 18 August

Light rain. High 91°, low 72°.

Pressure29.97 inHg
Wind15.1 mph NW
Humidity60%
Visibility—
Dew point73°
Wed, 1991° / 70°0Overcast
91 °Overcast

Grinnell, Wednesday, 19 August

Overcast. High 91°, low 70°.

Pressure29.91 inHg
Wind8.3 mph NE
Humidity52%
Visibility—
Dew point67°
Thu, 2082° / 65°0Clear
82 °Clear

Grinnell, Thursday, 20 August

Clear. High 82°, low 65°.

Pressure29.97 inHg
Wind11.9 mph NE
Humidity44%
Visibility—
Dew point55°
Fri, 2177° / 62°0.13Light rain
77 °Light rain

Grinnell, Friday, 21 August

Light rain. High 77°, low 62°.

Pressure30.03 inHg
Wind9.5 mph E
Humidity61%
Visibility—
Dew point59°
Sat, 22101° / 64°0.33Rain
101 °Rain

Grinnell, Saturday, 22 August

Rain. High 101°, low 64°.

Pressure29.85 inHg
Wind12 mph S
Humidity47%
Visibility—
Dew point65°
Sun, 2390° / 71°0.06Light rain
90 °Light rain

Grinnell, Sunday, 23 August

Light rain. High 90°, low 71°.

Pressure29.97 inHg
Wind10.9 mph SW
Humidity50%
Visibility—
Dew point66°

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 Grinnell, 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 Grinnell, 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.