As of 10:51 MDT

Weather in Grass Valley, MT

39°

Grass Valley, Saturday, 31 October, 10:51

Overcast. Feels like 37°. High 50°, low 36°.

Pressure30.06 inHg

Wind3.4 mph W

Humidity93%

Visibility6.2 mi

Dew point37°

See detailed hourly forecast

Monthly outlook for Grass Valley, MT: average high 50.4°, average low 35.9°. That is 6.4° above the climate normal for October. Precipitation is expected on 5 days (about 0.5 inches), against a normal of 6 days and 1.3 inches. The warmest day looks like 8 November (64.5°), the coolest 5 November (29.9°).

50.4°/35.9°

Average high / low

+6.4°

Above normal

5 / 6

Wet days / normal

0.5 in

Precipitation this month

Ten-day blocks vs climate normal

Period	Forecast high	Normal	Difference
31 October – 9 November	49.3°	40.1°	+5.1°
10 November – 19 November	52.2°	36.1°	+8.9°
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°

0.04

43 °

Grass Valley, Sunday, 1 November

Light rain. High 43°, low 37°.

Pressure29.94 inHg

Wind2.4 mph NW

Humidity96%

Visibility6.2 mi

Dew point39°

Mon, 0243° / 32°

43 °

Grass Valley, Monday, 2 November

Overcast. High 43°, low 32°.

Pressure30.42 inHg

Wind1.6 mph SW

Humidity89%

Visibility6.2 mi

Dew point35°

Tue, 0348° / 32°

48 °

Grass Valley, Tuesday, 3 November

Overcast. High 48°, low 32°.

Pressure30.24 inHg

Wind0.7 mph SE

Humidity66%

Visibility6.2 mi

Dew point30°

Wed, 0450° / 31°

50 °

Grass Valley, Wednesday, 4 November

Overcast. High 50°, low 31°.

Pressure30.06 inHg

Wind1.5 mph NW

Humidity67%

Visibility—

Dew point31°

Thu, 0539° / 30°

0.04

39 °

Grass Valley, Thursday, 5 November

Light rain. High 39°, low 30°.

Pressure30.18 inHg

Wind2.3 mph NW

Humidity76%

Visibility—

Dew point31°

Fri, 0649° / 33°

0.04

49 °

Grass Valley, Friday, 6 November

Light rain. High 49°, low 33°.

Pressure29.91 inHg

Wind16.5 mph W

Humidity68%

Visibility—

Dew point36°

Sat, 0756° / 32°

56 °

Grass Valley, Saturday, 7 November

Overcast. High 56°, low 32°.

Pressure30.18 inHg

Wind2.9 mph SE

Humidity38%

Visibility—

Dew point22°

Sun, 0865° / 40°

65 °

Grass Valley, Sunday, 8 November

Overcast. High 65°, low 40°.

Pressure30.00 inHg

Wind3.8 mph SE

Humidity39%

Visibility—

Dew point28°

Mon, 0950° / 40°

0.15

50 °

Grass Valley, Monday, 9 November

Light rain. High 50°, low 40°.

Pressure30.09 inHg

Wind3.4 mph NW

Humidity62%

Visibility—

Dew point36°

Tue, 1053° / 35°

53 °

Grass Valley, Tuesday, 10 November

Partly cloudy. High 53°, low 35°.

Pressure30.27 inHg

Wind4 mph SE

Humidity75%

Visibility—

Dew point38°

Wed, 1154° / 40°

54 °

Grass Valley, Wednesday, 11 November

Overcast. High 54°, low 40°.

Pressure30.00 inHg

Wind4 mph SE

Humidity56%

Visibility—

Dew point34°

Thu, 1256° / 42°

0.19

56 °

Grass Valley, Thursday, 12 November

Rain. High 56°, low 42°.

Pressure29.83 inHg

Wind11.9 mph W

Humidity83%

Visibility—

Dew point42°

Fri, 1349° / 39°

0.01

49 °

Grass Valley, Friday, 13 November

Light rain. High 49°, low 39°.

Pressure30.18 inHg

Wind3.3 mph N

Humidity80%

Visibility—

Dew point40°

Sat, 1454° / 40°

54 °

Grass Valley, Saturday, 14 November

Overcast. High 54°, low 40°.

Pressure29.97 inHg

Wind4.4 mph SE

Humidity78%

Visibility—

Dew point41°

Sun, 1547° / 36°

0.07

47 °

Grass Valley, Sunday, 15 November

Light rain. High 47°, low 36°.

Pressure30.06 inHg

Wind3.3 mph W

Humidity82%

Visibility—

Dew point41°

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.