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As of 18:42 CDT

Weather in Grinnell, IA

78°Current weather

Grinnell, Saturday, 8 August, 18:42

Mostly clear. Feels like 79°. High 81°, low 60°.

Pressure29.94 inHg
Wind6.4 mph SE
Humidity69%
Visibility6.2 mi
Dew point67°
Sun, 0991° / 70°0.02Light rain
91 °Light rain

Grinnell, Sunday, 9 August

Light rain. High 91°, low 70°.

Pressure29.80 inHg
Wind12.7 mph SW
Humidity58%
Visibility6.2 mi
Dew point69°
Mon, 1087° / 70°0.02Light rain
87 °Light rain

Grinnell, Monday, 10 August

Light rain. High 87°, low 70°.

Pressure29.83 inHg
Wind4.8 mph SW
Humidity58%
Visibility6.2 mi
Dew point67°
Tue, 1191° / 72°0Overcast
91 °Overcast

Grinnell, Tuesday, 11 August

Overcast. High 91°, low 72°.

Pressure29.74 inHg
Wind9.8 mph W
Humidity53%
Visibility6.2 mi
Dew point68°
Wed, 1286° / 69°0.25Rain
86 °Rain

Grinnell, Wednesday, 12 August

Rain. High 86°, low 69°.

Pressure29.88 inHg
Wind3.2 mph S
Humidity73%
Visibility6.2 mi
Dew point69°
Thu, 1378° / 63°0.22Light rain
78 °Light rain

Grinnell, Thursday, 13 August

Light rain. High 78°, low 63°.

Pressure29.94 inHg
Wind13.8 mph NE
Humidity72%
Visibility—
Dew point63°
Fri, 1478° / 56°0Clear
78 °Clear

Grinnell, Friday, 14 August

Clear. High 78°, low 56°.

Pressure30.18 inHg
Wind8 mph E
Humidity40%
Visibility—
Dew point48°
Sat, 1579° / 57°0Overcast
79 °Overcast

Grinnell, Saturday, 15 August

Overcast. High 79°, low 57°.

Pressure30.24 inHg
Wind11.8 mph SE
Humidity52%
Visibility—
Dew point55°
Sun, 1678° / 66°0Overcast
78 °Overcast

Grinnell, Sunday, 16 August

Overcast. High 78°, low 66°.

Pressure30.06 inHg
Wind12.3 mph S
Humidity69%
Visibility—
Dew point66°
Mon, 1791° / 68°0Overcast
91 °Overcast

Grinnell, Monday, 17 August

Overcast. High 91°, low 68°.

Pressure29.94 inHg
Wind12 mph NE
Humidity60%
Visibility—
Dew point68°
Tue, 1889° / 69°0Overcast
89 °Overcast

Grinnell, Tuesday, 18 August

Overcast. High 89°, low 69°.

Pressure30.00 inHg
Wind7.7 mph S
Humidity58%
Visibility—
Dew point67°
Wed, 1994° / 70°0.27Rain
94 °Rain

Grinnell, Wednesday, 19 August

Rain. High 94°, low 70°.

Pressure29.85 inHg
Wind15.2 mph NE
Humidity49%
Visibility—
Dew point66°
Thu, 2083° / 64°0.09Light rain
83 °Light rain

Grinnell, Thursday, 20 August

Light rain. High 83°, low 64°.

Pressure29.94 inHg
Wind11.6 mph NE
Humidity55%
Visibility—
Dew point61°
Fri, 2185° / 63°0Clear
85 °Clear

Grinnell, Friday, 21 August

Clear. High 85°, low 63°.

Pressure29.97 inHg
Wind8.2 mph S
Humidity44%
Visibility—
Dew point56°
Sat, 2282° / 62°0.05Light rain
82 °Light rain

Grinnell, Saturday, 22 August

Light rain. High 82°, low 62°.

Pressure29.94 inHg
Wind16.2 mph NE
Humidity59%
Visibility—
Dew point64°
Sun, 2373° / 46°0Mostly clear
73 °Mostly clear

Grinnell, Sunday, 23 August

Mostly clear. High 73°, low 46°.

Pressure30.21 inHg
Wind11.8 mph E
Humidity35%
Visibility—
Dew point38°

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, IA 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, IA 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.