As of 08:33 CDT

Weather in Grinnell, IA

39°

Grinnell, Sunday, 18 October, 08:33

Clear. Feels like 34°. High 63°, low 39°.

Pressure30.36 inHg

Wind8.1 mph S

Humidity87%

Visibility6.2 mi

Dew point36°

See detailed hourly forecast

Monthly outlook for Grinnell, IA: average high 61.3°, average low 46°. That is 2.1° above the climate normal for October. Precipitation is expected on 4 days (about 1.0 inches), against a normal of 5 days and 1.6 inches. The warmest day looks like 24 October (71.9°), the coolest 2 November (36.4°).

61.3°/46°

Average high / low

+2.1°

Above normal

4 / 5

Wet days / normal

1.0 in

Precipitation this month

Ten-day blocks vs climate normal

Period	Forecast high	Normal	Difference
18 October – 27 October	63.4°	58.9°	+2.5°
28 October – 6 November	57.9°	54°	+2.2°
7 November – 16 November	at normal	48.6°	—

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).

Mon, 1963° / 42°

63 °

Grinnell, Monday, 19 October

Overcast. High 63°, low 42°.

Pressure30.36 inHg

Wind5.6 mph S

Humidity63%

Visibility6.2 mi

Dew point46°

Tue, 2065° / 45°

65 °

Grinnell, Tuesday, 20 October

Clear. High 65°, low 45°.

Pressure30.36 inHg

Wind8.1 mph SE

Humidity57%

Visibility6.2 mi

Dew point47°

Wed, 2168° / 48°

68 °

Grinnell, Wednesday, 21 October

Clear. High 68°, low 48°.

Pressure30.27 inHg

Wind5.6 mph S

Humidity63%

Visibility6.2 mi

Dew point52°

Thu, 2269° / 50°

69 °

Grinnell, Thursday, 22 October

Clear. High 69°, low 50°.

Pressure30.27 inHg

Wind7.4 mph SE

Humidity51%

Visibility—

Dew point47°

Fri, 2367° / 52°

67 °

Grinnell, Friday, 23 October

Overcast. High 67°, low 52°.

Pressure30.24 inHg

Wind13.9 mph SE

Humidity57%

Visibility—

Dew point49°

Sat, 2472° / 54°

0.25

72 °

Grinnell, Saturday, 24 October

Rain. High 72°, low 54°.

Pressure30.12 inHg

Wind15.8 mph SW

Humidity51%

Visibility—

Dew point51°

Sun, 2554° / 45°

0.01

54 °

Grinnell, Sunday, 25 October

Light rain. High 54°, low 45°.

Pressure30.50 inHg

Wind9.8 mph NE

Humidity45%

Visibility—

Dew point31°

Mon, 2651° / 45°

0.53

51 °

Grinnell, Monday, 26 October

Rain. High 51°, low 45°.

Pressure30.27 inHg

Wind7.2 mph SE

Humidity96%

Visibility—

Dew point46°

Tue, 2762° / 51°

62 °

Grinnell, Tuesday, 27 October

Overcast. High 62°, low 51°.

Pressure30.18 inHg

Wind10.4 mph SE

Humidity67%

Visibility—

Dew point49°

Wed, 2860° / 52°

0.13

60 °

Grinnell, Wednesday, 28 October

Light rain. High 60°, low 52°.

Pressure29.85 inHg

Wind12.5 mph S

Humidity94%

Visibility—

Dew point54°

Thu, 2965° / 52°

65 °

Grinnell, Thursday, 29 October

Clear. High 65°, low 52°.

Pressure29.80 inHg

Wind8.8 mph W

Humidity50%

Visibility—

Dew point44°

Fri, 3069° / 49°

0.1

69 °

Grinnell, Friday, 30 October

Light rain. High 69°, low 49°.

Pressure29.59 inHg

Wind20.2 mph SE

Humidity75%

Visibility—

Dew point53°

Sat, 3148° / 39°

48 °

Grinnell, Saturday, 31 October

Overcast. High 48°, low 39°.

Pressure29.65 inHg

Wind27.3 mph W

Humidity61%

Visibility—

Dew point29°

Sun, 0148° / 37°

48 °

Grinnell, Sunday, 1 November

Clear. High 48°, low 37°.

Pressure30.24 inHg

Wind19.4 mph W

Humidity51%

Visibility—

Dew point27°

Mon, 0257° / 36°

57 °

Grinnell, Monday, 2 November

Overcast. High 57°, low 36°.

Pressure30.27 inHg

Wind17.3 mph S

Humidity47%

Visibility—

Dew point32°

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

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)

Fri, 1347° / 31°

0.07

47 °

Grinnell, Friday, 13 November

Climate normal for this date — 60-year average.

Average high47°

Average low31°

Average precipitation0.07 in

Chance of precipitation27%

Record high75° (1999)

Record low6° (1986)

Sat, 1447° / 32°

0.03

47 °

Grinnell, Saturday, 14 November

Climate normal for this date — 60-year average.

Average high47°

Average low32°

Average precipitation0.03 in

Chance of precipitation20%

Record high71° (1964)

Record low15° (1986)

Sun, 1547° / 33°

0.06

47 °

Grinnell, Sunday, 15 November

Climate normal for this date — 60-year average.

Average high47°

Average low33°

Average precipitation0.06 in

Chance of precipitation27%

Record high70° (1960)

Record low3° (1972)

Mon, 1648° / 32°

0.04

48 °

Grinnell, Monday, 16 November

Climate normal for this date — 60-year average.

Average high48°

Average low32°

Average precipitation0.04 in

Chance of precipitation23%

Record high69° (1971)

Record low14° (1997)

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.