As of 05:39 CDT

Weather in Grinnell, IA

57°

Grinnell, Wednesday, 14 October, 05:39

Overcast. Feels like 56°. High 66°, low 56°.

Pressure30.06 inHg

Wind8.1 mph N

Humidity77%

Visibility6.2 mi

Dew point50°

See detailed hourly forecast

Monthly outlook for Grinnell, IA: average high 57.9°, average low 43.3°. That is 0.7° below the climate normal for October. Precipitation is expected on 5 days (about 1.0 inches), against a normal of 4 days and 1.4 inches. The warmest day looks like 21 October (69.8°), the coolest 26 October (33.8°).

57.9°/43.3°

Average high / low

−0.7°

Below normal

5 / 4

Wet days / normal

1.0 in

Precipitation this month

Ten-day blocks vs climate normal

Period	Forecast high	Normal	Difference
14 October – 23 October	60.9°	60.6°	+0.2°
24 October – 2 November	52.9°	56°	-1.7°
3 November – 12 November	at normal	50.6°	—

October records over 66 years

90°6 October 1963All-time high

16.5°30 October 1980All-time low

Climate normals and records are computed from the nearest reference point — Malcom (9 mi).

Thu, 1561° / 52°

0.37

61 °

Grinnell, Thursday, 15 October

Rain. High 61°, low 52°.

Pressure29.94 inHg

Wind8.5 mph E

Humidity92%

Visibility6.1 mi

Dew point58°

Fri, 1654° / 42°

0.01

54 °

Grinnell, Friday, 16 October

Light rain. High 54°, low 42°.

Pressure30.30 inHg

Wind24.7 mph NW

Humidity69%

Visibility6.2 mi

Dew point39°

Sat, 1756° / 35°

56 °

Grinnell, Saturday, 17 October

Clear. High 56°, low 35°.

Pressure30.56 inHg

Wind7.6 mph SW

Humidity49%

Visibility6.2 mi

Dew point33°

Sun, 1861° / 42°

61 °

Grinnell, Sunday, 18 October

Clear. High 61°, low 42°.

Pressure30.33 inHg

Wind14.4 mph S

Humidity55%

Visibility—

Dew point40°

Mon, 1965° / 45°

65 °

Grinnell, Monday, 19 October

Overcast. High 65°, low 45°.

Pressure30.27 inHg

Wind11.8 mph S

Humidity56%

Visibility—

Dew point44°

Tue, 2066° / 48°

66 °

Grinnell, Tuesday, 20 October

Clear. High 66°, low 48°.

Pressure30.24 inHg

Wind7.3 mph S

Humidity60%

Visibility—

Dew point47°

Wed, 2170° / 49°

70 °

Grinnell, Wednesday, 21 October

Clear. High 70°, low 49°.

Pressure30.06 inHg

Wind12.9 mph N

Humidity56%

Visibility—

Dew point48°

Thu, 2255° / 42°

55 °

Grinnell, Thursday, 22 October

Clear. High 55°, low 42°.

Pressure30.30 inHg

Wind12.9 mph NE

Humidity49%

Visibility—

Dew point33°

Fri, 2355° / 36°

55 °

Grinnell, Friday, 23 October

Clear. High 55°, low 36°.

Pressure30.39 inHg

Wind11.3 mph SE

Humidity50%

Visibility—

Dew point33°

Sat, 2446° / 41°

0.17

46 °

Grinnell, Saturday, 24 October

Light rain. High 46°, low 41°.

Pressure30.24 inHg

Wind7.8 mph S

Humidity54%

Visibility—

Dew point29°

Sun, 2549° / 38°

0.05

49 °

Grinnell, Sunday, 25 October

Light rain. High 49°, low 38°.

Pressure30.15 inHg

Wind15.3 mph NW

Humidity55%

Visibility—

Dew point31°

Mon, 2654° / 34°

54 °

Grinnell, Monday, 26 October

Clear. High 54°, low 34°.

Pressure30.06 inHg

Wind9.9 mph SW

Humidity51%

Visibility—

Dew point30°

Tue, 2758° / 43°

58 °

Grinnell, Tuesday, 27 October

Clear. High 58°, low 43°.

Pressure29.94 inHg

Wind10.1 mph E

Humidity62%

Visibility—

Dew point41°

Wed, 2853° / 44°

0.02

53 °

Grinnell, Wednesday, 28 October

Light rain. High 53°, low 44°.

Pressure29.94 inHg

Wind9.7 mph E

Humidity72%

Visibility—

Dew point42°

Thu, 2958° / 46°

0.15

58 °

Grinnell, Thursday, 29 October

Light rain. High 58°, low 46°.

Pressure29.94 inHg

Wind8.5 mph E

Humidity67%

Visibility—

Dew point44°

From day 17 onward the outlook is built from 60-year climate statistics

Fri, 3057° / 41°

0.08

57 °

Grinnell, Friday, 30 October

Climate normal for this date — 60-year average.

Average high57°

Average low41°

Average precipitation0.08 in

Chance of precipitation37%

Record high75° (2024)

Record low17° (1980)

Sat, 3155° / 40°

0.14

55 °

Grinnell, Saturday, 31 October

Climate normal for this date — 60-year average.

Average high55°

Average low40°

Average precipitation0.14 in

Chance of precipitation35%

Record high76° (1968)

Record low22° (1993)

Sun, 0155° / 39°

0.2

55 °

Grinnell, Sunday, 1 November

Climate normal for this date — 60-year average.

Average high55°

Average low39°

Average precipitation0.2 in

Chance of precipitation38%

Record high74° (2000)

Record low22° (2023)

Mon, 0253° / 38°

0.09

53 °

Grinnell, Monday, 2 November

Climate normal for this date — 60-year average.

Average high53°

Average low38°

Average precipitation0.09 in

Chance of precipitation33%

Record high73° (1964)

Record low15° (1991)

Tue, 0353° / 38°

0.07

53 °

Grinnell, Tuesday, 3 November

Climate normal for this date — 60-year average.

Average high53°

Average low38°

Average precipitation0.07 in

Chance of precipitation22%

Record high73° (1978)

Record low11° (1991)

Wed, 0452° / 38°

0.12

52 °

Grinnell, Wednesday, 4 November

Climate normal for this date — 60-year average.

Average high52°

Average low38°

Average precipitation0.12 in

Chance of precipitation23%

Record high70° (2008)

Record low9° (1991)

Thu, 0552° / 37°

0.07

52 °

Grinnell, Thursday, 5 November

Climate normal for this date — 60-year average.

Average high52°

Average low37°

Average precipitation0.07 in

Chance of precipitation20%

Record high71° (2015)

Record low19° (1991)

Fri, 0652° / 37°

0.06

52 °

Grinnell, Friday, 6 November

Climate normal for this date — 60-year average.

Average high52°

Average low37°

Average precipitation0.06 in

Chance of precipitation18%

Record high70° (2020)

Record low17° (1991)

Sat, 0752° / 36°

0.02

52 °

Grinnell, Saturday, 7 November

Climate normal for this date — 60-year average.

Average high52°

Average low36°

Average precipitation0.02 in

Chance of precipitation12%

Record high71° (2001)

Record low4° (1991)

Sun, 0851° / 36°

0.04

51 °

Grinnell, Sunday, 8 November

Climate normal for this date — 60-year average.

Average high51°

Average low36°

Average precipitation0.04 in

Chance of precipitation22%

Record high76° (1999)

Record low7° (1991)

Mon, 0951° / 36°

0.09

51 °

Grinnell, Monday, 9 November

Climate normal for this date — 60-year average.

Average high51°

Average low36°

Average precipitation0.09 in

Chance of precipitation33%

Record high73° (1999)

Record low17° (1991)

Tue, 1049° / 34°

0.09

49 °

Grinnell, Tuesday, 10 November

Climate normal for this date — 60-year average.

Average high49°

Average low34°

Average precipitation0.09 in

Chance of precipitation28%

Record high74° (2012)

Record low13° (2018)

Wed, 1147° / 32°

0.09

47 °

Grinnell, Wednesday, 11 November

Climate normal for this date — 60-year average.

Average high47°

Average low32°

Average precipitation0.09 in

Chance of precipitation23%

Record high71° (1964)

Record low11° (2019)

Thu, 1246° / 31°

0.07

46 °

Grinnell, Thursday, 12 November

Climate normal for this date — 60-year average.

Average high46°

Average low31°

Average precipitation0.07 in

Chance of precipitation28%

Record high66° (1964)

Record low3° (2019)

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.