As of 10:22 MDT

Weather in Grass Valley, MT

38°

Grass Valley, Friday, 30 October, 10:22

Overcast. Feels like 38°. High 49°, low 33°.

Pressure30.00 inHg

Wind1.2 mph W

Humidity96%

Visibility1.9 mi

Dew point36°

See detailed hourly forecast

Monthly outlook for Grass Valley, MT: average high 49.9°, average low 33.9°. That is 5.9° above the climate normal for October. Precipitation is expected on 5 days (about 0.4 inches), against a normal of 7 days and 1.3 inches. The warmest day looks like 10 November (55.6°), the coolest 8 November (30.1°).

49.9°/33.9°

Average high / low

+5.9°

Above normal

5 / 7

Wet days / normal

0.4 in

Precipitation this month

Ten-day blocks vs climate normal

Period	Forecast high	Normal	Difference
30 October – 8 November	50.2°	40.5°	+5.4°
9 November – 18 November	49.4°	36.5°	+7.1°
19 November – 28 November	at normal	31.8°	—

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).

Sat, 3152° / 38°

52 °

Grass Valley, Saturday, 31 October

Overcast. High 52°, low 38°.

Pressure30.06 inHg

Wind0.8 mph SE

Humidity84%

Visibility2.5 mi

Dew point38°

Sun, 0148° / 34°

0.01

48 °

Grass Valley, Sunday, 1 November

Light rain. High 48°, low 34°.

Pressure29.94 inHg

Wind0.9 mph N

Humidity88%

Visibility6.2 mi

Dew point40°

Mon, 0247° / 33°

47 °

Grass Valley, Monday, 2 November

Overcast. High 47°, low 33°.

Pressure30.42 inHg

Wind2.5 mph SW

Humidity72%

Visibility6.2 mi

Dew point34°

Tue, 0352° / 33°

0.03

52 °

Grass Valley, Tuesday, 3 November

Light rain. High 52°, low 33°.

Pressure30.33 inHg

Wind1.4 mph SE

Humidity59%

Visibility—

Dew point30°

Wed, 0452° / 34°

52 °

Grass Valley, Wednesday, 4 November

Clear. High 52°, low 34°.

Pressure30.15 inHg

Wind1.6 mph NW

Humidity70%

Visibility—

Dew point34°

Thu, 0553° / 33°

53 °

Grass Valley, Thursday, 5 November

Partly cloudy. High 53°, low 33°.

Pressure29.94 inHg

Wind2.5 mph SE

Humidity52%

Visibility—

Dew point28°

Fri, 0652° / 36°

0.1

52 °

Grass Valley, Friday, 6 November

Snow. High 52°, low 36°.

Pressure29.83 inHg

Wind4.6 mph W

Humidity54%

Visibility—

Dew point28°

Sat, 0745° / 31°

0.01

45 °

Grass Valley, Saturday, 7 November

Light rain. High 45°, low 31°.

Pressure30.30 inHg

Wind3.3 mph W

Humidity71%

Visibility—

Dew point32°

Sun, 0852° / 30°

52 °

Grass Valley, Sunday, 8 November

Clear. High 52°, low 30°.

Pressure30.30 inHg

Wind3.4 mph SE

Humidity53%

Visibility—

Dew point26°

Mon, 0951° / 33°

51 °

Grass Valley, Monday, 9 November

Overcast. High 51°, low 33°.

Pressure29.97 inHg

Wind4.9 mph SE

Humidity56%

Visibility—

Dew point28°

Tue, 1056° / 38°

56 °

Grass Valley, Tuesday, 10 November

Overcast. High 56°, low 38°.

Pressure29.80 inHg

Wind5.1 mph SE

Humidity48%

Visibility—

Dew point29°

Wed, 1150° / 37°

0.06

50 °

Grass Valley, Wednesday, 11 November

Light rain. High 50°, low 37°.

Pressure29.44 inHg

Wind5.5 mph SE

Humidity63%

Visibility—

Dew point33°

Thu, 1246° / 38°

0.06

46 °

Grass Valley, Thursday, 12 November

Snow. High 46°, low 38°.

Pressure29.74 inHg

Wind10.4 mph NW

Humidity70%

Visibility—

Dew point35°

Fri, 1346° / 32°

0.01

46 °

Grass Valley, Friday, 13 November

Light snow. High 46°, low 32°.

Pressure30.21 inHg

Wind3.6 mph SE

Humidity67%

Visibility—

Dew point32°

Sat, 1448° / 31°

0.06

48 °

Grass Valley, Saturday, 14 November

Light snow. High 48°, low 31°.

Pressure30.09 inHg

Wind5 mph SE

Humidity56%

Visibility—

Dew point26°

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

Sun, 1537° / 22°

0.03

37 °

Grass Valley, Sunday, 15 November

Climate normal for this date — 60-year average.

Average high37°

Average low22°

Average precipitation0.03 in

Chance of precipitation17%

Record high54° (2021)

Record low0° (2014)

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)

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.