As of 03:05 MDT

Weather in Grass Range, MT

49°

Grass Range, Thursday, 8 October, 03:05

Clear. Feels like 47°. High 75°, low 48°.

Pressure30.03 inHg

Wind5.9 mph SW

Humidity54%

Visibility6.2 mi

Dew point33°

See detailed hourly forecast

Monthly outlook for Grass Range, MT: average high 55.2°, average low 38.2°. That is 1.8° below the climate normal for October. Precipitation is expected on 5 days (about 2.1 inches), against a normal of 3 days and 0.7 inches. The warmest day looks like 9 October (82.3°), the coolest 13 October (23.6°).

55.2°/38.2°

Average high / low

−1.8°

Below normal

5 / 3

Wet days / normal

2.1 in

Precipitation this month

Ten-day blocks vs climate normal

Period	Forecast high	Normal	Difference
8 October – 17 October	53.6°	58.6°	-2.8°
18 October – 27 October	57.8°	56.7°	+0.6°
28 October – 6 November	at normal	50.3°	—

October records over 66 years

90°1 October 2011All-time high

-11.9°30 October 1991All-time low

Fri, 0982° / 53°

82 °

Grass Range, Friday, 9 October

Overcast. High 82°, low 53°.

Pressure29.50 inHg

Wind15.1 mph W

Humidity16%

Visibility6.2 mi

Dew point29°

Sat, 1064° / 39°

0.11

64 °

Grass Range, Saturday, 10 October

Light rain. High 64°, low 39°.

Pressure29.65 inHg

Wind9.2 mph N

Humidity50%

Visibility6.2 mi

Dew point39°

Sun, 1138° / 33°

0.62

38 °

Grass Range, Sunday, 11 October

Snow. High 38°, low 33°.

Pressure30.12 inHg

Wind6.6 mph N

Humidity96%

Visibility2.7 mi

Dew point35°

Mon, 1233° / 31°

0.6

33 °

Grass Range, Monday, 12 October

Snow. High 33°, low 31°.

Pressure30.21 inHg

Wind8.2 mph N

Humidity95%

Visibility—

Dew point31°

Tue, 1344° / 24°

44 °

Grass Range, Tuesday, 13 October

Clear. High 44°, low 24°.

Pressure30.06 inHg

Wind5.5 mph S

Humidity79%

Visibility—

Dew point30°

Wed, 1465° / 43°

0.06

65 °

Grass Range, Wednesday, 14 October

Light rain. High 65°, low 43°.

Pressure29.32 inHg

Wind24.2 mph NW

Humidity37%

Visibility—

Dew point37°

Thu, 1538° / 33°

0.76

38 °

Grass Range, Thursday, 15 October

Snow. High 38°, low 33°.

Pressure30.06 inHg

Wind36.3 mph NW

Humidity90%

Visibility—

Dew point30°

Fri, 1643° / 26°

43 °

Grass Range, Friday, 16 October

Clear. High 43°, low 26°.

Pressure30.42 inHg

Wind12.5 mph W

Humidity90%

Visibility—

Dew point34°

Sat, 1753° / 32°

53 °

Grass Range, Saturday, 17 October

Clear. High 53°, low 32°.

Pressure30.03 inHg

Wind14.4 mph W

Humidity53%

Visibility—

Dew point31°

Sun, 1859° / 41°

59 °

Grass Range, Sunday, 18 October

Partly cloudy. High 59°, low 41°.

Pressure30.09 inHg

Wind19.5 mph S

Humidity42%

Visibility—

Dew point30°

Mon, 1962° / 47°

62 °

Grass Range, Monday, 19 October

Partly cloudy. High 62°, low 47°.

Pressure30.03 inHg

Wind9.7 mph W

Humidity36%

Visibility—

Dew point31°

Tue, 2069° / 46°

69 °

Grass Range, Tuesday, 20 October

Overcast. High 69°, low 46°.

Pressure29.88 inHg

Wind13.3 mph W

Humidity21%

Visibility—

Dew point24°

Wed, 2159° / 47°

59 °

Grass Range, Wednesday, 21 October

Overcast. High 59°, low 47°.

Pressure29.35 inHg

Wind35.8 mph W

Humidity32%

Visibility—

Dew point29°

Thu, 2248° / 36°

48 °

Grass Range, Thursday, 22 October

Overcast. High 48°, low 36°.

Pressure29.53 inHg

Wind40.2 mph W

Humidity43%

Visibility—

Dew point22°

Fri, 2349° / 33°

49 °

Grass Range, Friday, 23 October

Clear. High 49°, low 33°.

Pressure29.65 inHg

Wind8.5 mph NE

Humidity51%

Visibility—

Dew point26°

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

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)

Fri, 0648° / 31°

0.03

48 °

Grass Range, Friday, 6 November

Climate normal for this date — 60-year average.

Average high48°

Average low31°

Average precipitation0.03 in

Chance of precipitation18%

Record high73° (2010)

Record low2° (2017)

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.