As of 15:56 MDT

Weather in Grass Valley, MT

43°

Grass Valley, Saturday, 31 October, 15:56

Overcast. Feels like 43°. High 44°, low 36°.

Pressure29.97 inHg

Wind0 mph N

Humidity75%

Visibility6.2 mi

Dew point35°

See detailed hourly forecast

Monthly outlook for Grass Valley, MT: average high 47.6°, average low 34.5°. That is 4.9° above the climate normal for October. Precipitation is expected on 2 days (about 0.3 inches), against a normal of 6 days and 1.3 inches. The warmest day looks like 10 November (53.8°), the coolest 5 November (29.4°).

47.6°/34.5°

Average high / low

+4.9°

Above normal

2 / 6

Wet days / normal

0.3 in

Precipitation this month

Ten-day blocks vs climate normal

Period	Forecast high	Normal	Difference
31 October – 9 November	46.9°	40.1°	+3.8°
10 November – 19 November	48.9°	36.1°	+7.1°
20 November – 29 November	at normal	31.4°	—

October records over 66 years

78.4°1 October 1992All-time high

-12.5°29 October 2019All-time low

Climate normals and records are computed from the nearest reference point — Evaro (11 mi).

Sun, 0143° / 37°

0.02

43 °

Grass Valley, Sunday, 1 November

Light rain. High 43°, low 37°.

Pressure29.94 inHg

Wind3.6 mph NW

Humidity95%

Visibility5.0 mi

Dew point39°

Mon, 0244° / 32°

44 °

Grass Valley, Monday, 2 November

Overcast. High 44°, low 32°.

Pressure30.42 inHg

Wind1.9 mph S

Humidity85%

Visibility6.2 mi

Dew point34°

Tue, 0347° / 33°

47 °

Grass Valley, Tuesday, 3 November

Overcast. High 47°, low 33°.

Pressure30.21 inHg

Wind0.6 mph NW

Humidity64%

Visibility6.2 mi

Dew point30°

Wed, 0452° / 30°

52 °

Grass Valley, Wednesday, 4 November

Mostly clear. High 52°, low 30°.

Pressure30.09 inHg

Wind0.5 mph S

Humidity61%

Visibility6.2 mi

Dew point32°

Thu, 0547° / 29°

0.01

47 °

Grass Valley, Thursday, 5 November

Light rain. High 47°, low 29°.

Pressure30.18 inHg

Wind5.2 mph SW

Humidity74%

Visibility—

Dew point31°

Fri, 0644° / 31°

0.2

44 °

Grass Valley, Friday, 6 November

Snow. High 44°, low 31°.

Pressure29.88 inHg

Wind12 mph W

Humidity79%

Visibility—

Dew point37°

Sat, 0748° / 30°

48 °

Grass Valley, Saturday, 7 November

Mostly clear. High 48°, low 30°.

Pressure30.24 inHg

Wind4.2 mph SE

Humidity52%

Visibility—

Dew point25°

Sun, 0849° / 35°

0.02

49 °

Grass Valley, Sunday, 8 November

Light rain. High 49°, low 35°.

Pressure29.94 inHg

Wind9.8 mph W

Humidity39%

Visibility—

Dew point23°

Mon, 0949° / 33°

49 °

Grass Valley, Monday, 9 November

Overcast. High 49°, low 33°.

Pressure30.18 inHg

Wind3.9 mph S

Humidity62%

Visibility—

Dew point30°

Tue, 1054° / 40°

54 °

Grass Valley, Tuesday, 10 November

Overcast. High 54°, low 40°.

Pressure30.00 inHg

Wind3.4 mph SE

Humidity53%

Visibility—

Dew point31°

Wed, 1152° / 39°

52 °

Grass Valley, Wednesday, 11 November

Overcast. High 52°, low 39°.

Pressure29.59 inHg

Wind3.2 mph SE

Humidity61%

Visibility—

Dew point35°

Thu, 1244° / 40°

0.06

44 °

Grass Valley, Thursday, 12 November

Light rain. High 44°, low 40°.

Pressure29.68 inHg

Wind4.2 mph W

Humidity87%

Visibility—

Dew point40°

Fri, 1342° / 35°

42 °

Grass Valley, Friday, 13 November

Light rain. High 42°, low 35°.

Pressure30.21 inHg

Wind3 mph W

Humidity87%

Visibility—

Dew point37°

Sat, 1449° / 34°

49 °

Grass Valley, Saturday, 14 November

Overcast. High 49°, low 34°.

Pressure30.30 inHg

Wind1.8 mph W

Humidity70%

Visibility—

Dew point34°

Sun, 1552° / 38°

52 °

Grass Valley, Sunday, 15 November

Overcast. High 52°, low 38°.

Pressure30.03 inHg

Wind3.1 mph SE

Humidity72%

Visibility—

Dew point37°

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

Mon, 1636° / 23°

0.08

36 °

Grass Valley, Monday, 16 November

Climate normal for this date — 60-year average.

Average high36°

Average low23°

Average precipitation0.08 in

Chance of precipitation45%

Record high52° (2025)

Record low-1° (1961)

Tue, 1735° / 22°

0.07

35 °

Grass Valley, Tuesday, 17 November

Climate normal for this date — 60-year average.

Average high35°

Average low22°

Average precipitation0.07 in

Chance of precipitation48%

Record high52° (1976)

Record low-7° (1968)

Wed, 1835° / 21°

0.09

35 °

Grass Valley, Wednesday, 18 November

Climate normal for this date — 60-year average.

Average high35°

Average low21°

Average precipitation0.09 in

Chance of precipitation47%

Record high53° (2008)

Record low-3° (2022)

Thu, 1934° / 21°

0.07

34 °

Grass Valley, Thursday, 19 November

Climate normal for this date — 60-year average.

Average high34°

Average low21°

Average precipitation0.07 in

Chance of precipitation38%

Record high47° (1989)

Record low-3° (1975)

Fri, 2034° / 21°

0.07

34 °

Grass Valley, Friday, 20 November

Climate normal for this date — 60-year average.

Average high34°

Average low21°

Average precipitation0.07 in

Chance of precipitation43%

Record high46° (2002)

Record low-14° (1977)

Sat, 2133° / 19°

0.07

33 °

Grass Valley, Saturday, 21 November

Climate normal for this date — 60-year average.

Average high33°

Average low19°

Average precipitation0.07 in

Chance of precipitation43%

Record high45° (2002)

Record low-15° (1977)

Sun, 2232° / 19°

0.07

32 °

Grass Valley, Sunday, 22 November

Climate normal for this date — 60-year average.

Average high32°

Average low19°

Average precipitation0.07 in

Chance of precipitation43%

Record high47° (2002)

Record low-22° (1970)

Mon, 2332° / 18°

0.07

32 °

Grass Valley, Monday, 23 November

Climate normal for this date — 60-year average.

Average high32°

Average low18°

Average precipitation0.07 in

Chance of precipitation45%

Record high46° (2017)

Record low-22° (1985)

Tue, 2431° / 20°

0.13

31 °

Grass Valley, Tuesday, 24 November

Climate normal for this date — 60-year average.

Average high31°

Average low20°

Average precipitation0.13 in

Chance of precipitation48%

Record high43° (2017)

Record low-22° (1985)

Wed, 2531° / 18°

0.13

31 °

Grass Valley, Wednesday, 25 November

Climate normal for this date — 60-year average.

Average high31°

Average low18°

Average precipitation0.13 in

Chance of precipitation58%

Record high44° (2022)

Record low-16° (2010)

Thu, 2630° / 17°

0.08

30 °

Grass Valley, Thursday, 26 November

Climate normal for this date — 60-year average.

Average high30°

Average low17°

Average precipitation0.08 in

Chance of precipitation38%

Record high50° (2017)

Record low-11° (1993)

Fri, 2730° / 17°

0.07

30 °

Grass Valley, Friday, 27 November

Climate normal for this date — 60-year average.

Average high30°

Average low17°

Average precipitation0.07 in

Chance of precipitation48%

Record high48° (2017)

Record low-9° (1967)

Sat, 2830° / 18°

0.08

30 °

Grass Valley, Saturday, 28 November

Climate normal for this date — 60-year average.

Average high30°

Average low18°

Average precipitation0.08 in

Chance of precipitation42%

Record high44° (2021)

Record low-7° (1979)

Sun, 2929° / 16°

0.06

29 °

Grass Valley, Sunday, 29 November

Climate normal for this date — 60-year average.

Average high29°

Average low16°

Average precipitation0.06 in

Chance of precipitation40%

Record high41° (1969)

Record low-4° (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 Grass Valley, 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 Valley, 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.