10-day forecast for Grinnell, IA: 59° to 93°, with precipitation expected on 2 days. The table below breaks each day into morning, afternoon, evening and overnight.
93°
Best day: Sunday, August 9
68° · 0.06 in
Worst day: Saturday, August 15
Tap any day below to see morning, afternoon, evening and overnight.
Mon, 1090° / 73°0.01
Morning74°feels 75°
Afternoon89°feels 93°
Evening76°feels 76°
Overnight76°feels 77°
90 °
Grinnell, Monday, 10 August
Light rain. High 90°, low 73°.
Pressure29.85 inHg
Wind5.8 mph SE
Humidity57%
Visibility6.2 mi
Dew point69°
Tue, 1191° / 72°0
Morning76°feels 77°
Afternoon91°feels 95°
Evening80°feels 80°
Overnight74°feels 75°
91 °
Grinnell, Tuesday, 11 August
Partly cloudy. High 91°, low 72°.
Pressure29.77 inHg
Wind7.8 mph SW
Humidity52%
Visibility6.2 mi
Dew point68°
Wed, 1285° / 68°0
Morning72°feels 73°
Afternoon83°feels 85°
Evening73°feels 74°
Overnight70°feels 72°
85 °
Grinnell, Wednesday, 12 August
Overcast. High 85°, low 68°.
Pressure29.85 inHg
Wind14.1 mph NE
Humidity65%
Visibility6.2 mi
Dew point66°
Thu, 1371° / 61°0.06
Morning64°feels 64°
Afternoon70°feels 70°
Evening63°feels 64°
Overnight61°feels 61°
71 °
Grinnell, Thursday, 13 August
Light rain. High 71°, low 61°.
Pressure29.97 inHg
Wind14 mph NE
Humidity67%
Visibility—
Dew point58°
Fri, 1479° / 60°0
Morning65°feels 65°
Afternoon78°feels 77°
Evening72°feels 71°
Overnight67°feels 67°
79 °
Grinnell, Friday, 14 August
Overcast. High 79°, low 60°.
Pressure30.09 inHg
Wind11.2 mph E
Humidity48%
Visibility—
Dew point55°
Sat, 1568° / 59°0.06
Morning65°feels 64°
Afternoon59°feels 59°
Evening59°feels 59°
Overnight61°feels 61°
68 °
Grinnell, Saturday, 15 August
Light rain. High 68°, low 59°.
Pressure30.24 inHg
Wind14.9 mph SE
Humidity95%
Visibility—
Dew point58°
Sun, 1676° / 60°0.01
Morning64°feels 64°
Afternoon70°feels 71°
Evening73°feels 74°
Overnight67°feels 68°
76 °
Grinnell, Sunday, 16 August
Light rain. High 76°, low 60°.
Pressure30.12 inHg
Wind6.6 mph E
Humidity80%
Visibility—
Dew point62°
Mon, 1785° / 65°0.01
Morning70°feels 71°
Afternoon83°feels 85°
Evening80°feels 82°
Overnight71°feels 72°
85 °
Grinnell, Monday, 17 August
Light rain. High 85°, low 65°.
Pressure30.03 inHg
Wind7.9 mph S
Humidity57%
Visibility—
Dew point64°
Tue, 1890° / 68°0
Morning73°feels 75°
Afternoon86°feels 90°
Evening84°feels 89°
Overnight75°feels 76°
90 °
Grinnell, Tuesday, 18 August
Partly cloudy. High 90°, low 68°.
Pressure29.94 inHg
Wind13.3 mph S
Humidity55%
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 Grinnell, IA 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.