As of 17:33 MDT

Weather in Grass Range, MT

71°

Grass Range, Wednesday, 7 October, 17:33

Overcast. Feels like 69°. High 72°, low 46°.

Pressure30.03 inHg

Wind3.4 mph NE

Humidity31%

Visibility6.2 mi

Dew point39°

See detailed hourly forecast

Monthly outlook for Grass Range, MT: average high 54.8°, average low 37°. That is 2.2° below the climate normal for October. Precipitation is expected on 7 days (about 1.1 inches), against a normal of 3 days and 0.7 inches. The warmest day looks like 9 October (82.2°), the coolest 16 October (22.4°).

54.8°/37°

Average high / low

−2.2°

Below normal

7 / 3

Wet days / normal

1.1 in

Precipitation this month

Ten-day blocks vs climate normal

Period	Forecast high	Normal	Difference
7 October – 16 October	56°	59.2°	-1.8°
17 October – 26 October	52.8°	57.1°	-2.4°
27 October – 5 November	at normal	50.8°	—

October records over 66 years

90°1 October 2011All-time high

-11.9°30 October 1991All-time low

Thu, 0878° / 48°

78 °

Grass Range, Thursday, 8 October

Clear. High 78°, low 48°.

Pressure29.91 inHg

Wind6 mph NW

Humidity21%

Visibility6.2 mi

Dew point30°

Fri, 0982° / 53°

82 °

Grass Range, Friday, 9 October

Partly cloudy. High 82°, low 53°.

Pressure29.47 inHg

Wind15.1 mph W

Humidity17%

Visibility6.2 mi

Dew point30°

Sat, 1060° / 37°

0.06

60 °

Grass Range, Saturday, 10 October

Light rain. High 60°, low 37°.

Pressure29.71 inHg

Wind12.3 mph N

Humidity62%

Visibility6.2 mi

Dew point39°

Sun, 1136° / 32°

0.27

36 °

Grass Range, Sunday, 11 October

Snow. High 36°, low 32°.

Pressure30.21 inHg

Wind10.5 mph NE

Humidity88%

Visibility4.1 mi

Dew point29°

Mon, 1236° / 31°

0.19

36 °

Grass Range, Monday, 12 October

Snow. High 36°, low 31°.

Pressure30.24 inHg

Wind7.6 mph SE

Humidity86%

Visibility—

Dew point31°

Tue, 1367° / 28°

0.03

67 °

Grass Range, Tuesday, 13 October

Light rain. High 67°, low 28°.

Pressure29.65 inHg

Wind20.4 mph W

Humidity50%

Visibility—

Dew point38°

Wed, 1452° / 35°

0.06

52 °

Grass Range, Wednesday, 14 October

Snow. High 52°, low 35°.

Pressure29.65 inHg

Wind27.1 mph W

Humidity34%

Visibility—

Dew point23°

Thu, 1534° / 28°

0.04

34 °

Grass Range, Thursday, 15 October

Light snow. High 34°, low 28°.

Pressure30.39 inHg

Wind24.4 mph NW

Humidity72%

Visibility—

Dew point24°

Fri, 1643° / 22°

43 °

Grass Range, Friday, 16 October

Clear. High 43°, low 22°.

Pressure30.62 inHg

Wind9.7 mph SE

Humidity45%

Visibility—

Dew point16°

Sat, 1748° / 30°

48 °

Grass Range, Saturday, 17 October

Clear. High 48°, low 30°.

Pressure30.21 inHg

Wind14.9 mph SE

Humidity47%

Visibility—

Dew point23°

Sun, 1848° / 38°

0.24

48 °

Grass Range, Sunday, 18 October

Rain. High 48°, low 38°.

Pressure29.68 inHg

Wind12 mph N

Humidity68%

Visibility—

Dew point37°

Mon, 1954° / 38°

0.21

54 °

Grass Range, Monday, 19 October

Light rain. High 54°, low 38°.

Pressure29.91 inHg

Wind22.2 mph NW

Humidity43%

Visibility—

Dew point28°

Tue, 2056° / 42°

56 °

Grass Range, Tuesday, 20 October

Overcast. High 56°, low 42°.

Pressure30.24 inHg

Wind7.7 mph W

Humidity48%

Visibility—

Dew point33°

Wed, 2161° / 43°

61 °

Grass Range, Wednesday, 21 October

Overcast. High 61°, low 43°.

Pressure30.15 inHg

Wind12.7 mph NW

Humidity36%

Visibility—

Dew point29°

Thu, 2249° / 40°

0.02

49 °

Grass Range, Thursday, 22 October

Light rain. High 49°, low 40°.

Pressure30.33 inHg

Wind26.5 mph NW

Humidity42%

Visibility—

Dew point25°

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

Fri, 2356° / 38°

0.04

56 °

Grass Range, Friday, 23 October

Climate normal for this date — 60-year average.

Average high56°

Average low38°

Average precipitation0.04 in

Chance of precipitation20%

Record high74° (1965)

Record low6° (2020)

Sat, 2456° / 37°

0.04

56 °

Grass Range, Saturday, 24 October

Climate normal for this date — 60-year average.

Average high56°

Average low37°

Average precipitation0.04 in

Chance of precipitation23%

Record high79° (2007)

Record low11° (2020)

Sun, 2556° / 37°

0.04

56 °

Grass Range, Sunday, 25 October

Climate normal for this date — 60-year average.

Average high56°

Average low37°

Average precipitation0.04 in

Chance of precipitation22%

Record high77° (1990)

Record low-4° (2020)

Mon, 2654° / 37°

0.04

54 °

Grass Range, Monday, 26 October

Climate normal for this date — 60-year average.

Average high54°

Average low37°

Average precipitation0.04 in

Chance of precipitation25%

Record high76° (1960)

Record low-3° (2020)

Tue, 2753° / 35°

0.03

53 °

Grass Range, Tuesday, 27 October

Climate normal for this date — 60-year average.

Average high53°

Average low35°

Average precipitation0.03 in

Chance of precipitation18%

Record high73° (1983)

Record low1° (2023)

Wed, 2853° / 35°

0.05

53 °

Grass Range, Wednesday, 28 October

Climate normal for this date — 60-year average.

Average high53°

Average low35°

Average precipitation0.05 in

Chance of precipitation27%

Record high75° (1990)

Record low6° (2023)

Thu, 2951° / 34°

0.02

51 °

Grass Range, Thursday, 29 October

Climate normal for this date — 60-year average.

Average high51°

Average low34°

Average precipitation0.02 in

Chance of precipitation18%

Record high76° (1968)

Record low0° (1991)

Fri, 3051° / 32°

0.04

51 °

Grass Range, Friday, 30 October

Climate normal for this date — 60-year average.

Average high51°

Average low32°

Average precipitation0.04 in

Chance of precipitation17%

Record high71° (1987)

Record low-12° (1991)

Sat, 3150° / 33°

0.05

50 °

Grass Range, Saturday, 31 October

Climate normal for this date — 60-year average.

Average high50°

Average low33°

Average precipitation0.05 in

Chance of precipitation17%

Record high72° (1990)

Record low5° (1984)

Sun, 0149° / 33°

0.02

49 °

Grass Range, Sunday, 1 November

Climate normal for this date — 60-year average.

Average high49°

Average low33°

Average precipitation0.02 in

Chance of precipitation15%

Record high74° (2025)

Record low-1° (1991)

Mon, 0249° / 32°

0.01

49 °

Grass Range, Monday, 2 November

Climate normal for this date — 60-year average.

Average high49°

Average low32°

Average precipitation0.01 in

Chance of precipitation7%

Record high73° (2020)

Record low-5° (1991)

Tue, 0350° / 33°

0.04

50 °

Grass Range, Tuesday, 3 November

Climate normal for this date — 60-year average.

Average high50°

Average low33°

Average precipitation0.04 in

Chance of precipitation22%

Record high74° (2020)

Record low-5° (1991)

Wed, 0451° / 33°

0.03

51 °

Grass Range, Wednesday, 4 November

Climate normal for this date — 60-year average.

Average high51°

Average low33°

Average precipitation0.03 in

Chance of precipitation18%

Record high72° (1976)

Record low3° (2003)

Thu, 0550° / 33°

0.04

50 °

Grass Range, Thursday, 5 November

Climate normal for this date — 60-year average.

Average high50°

Average low33°

Average precipitation0.04 in

Chance of precipitation25%

Record high73° (2010)

Record low-5° (2003)

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 Grass Range, MT 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 Grass Range, MT 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.