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As of 18:49 MDT

Weather in Grass Valley, MT

89°Current weather

Grass Valley, Saturday, 8 August, 18:49

Partly cloudy. Feels like 85°. High 89°, low 53°.

Pressure29.85 inHg
Wind3 mph SE
Humidity18%
Visibility6.2 mi
Dew point42°
Sun, 0991° / 47°0Partly cloudy
91 °Partly cloudy

Grass Valley, Sunday, 9 August

Partly cloudy. High 91°, low 47°.

Pressure29.88 inHg
Wind0.6 mph N
Humidity16%
Visibility6.2 mi
Dew point33°
Mon, 1091° / 47°0Clear
91 °Clear

Grass Valley, Monday, 10 August

Clear. High 91°, low 47°.

Pressure29.88 inHg
Wind2.8 mph W
Humidity15%
Visibility6.2 mi
Dew point31°
Tue, 1193° / 54°0Clear
93 °Clear

Grass Valley, Tuesday, 11 August

Clear. High 93°, low 54°.

Pressure29.94 inHg
Wind0.9 mph W
Humidity17%
Visibility6.2 mi
Dew point34°
Wed, 1294° / 57°0.02Light rain
94 °Light rain

Grass Valley, Wednesday, 12 August

Light rain. High 94°, low 57°.

Pressure29.83 inHg
Wind1 mph W
Humidity17%
Visibility6.2 mi
Dew point34°
Thu, 1391° / 55°0Light rain
91 °Light rain

Grass Valley, Thursday, 13 August

Light rain. High 91°, low 55°.

Pressure29.80 inHg
Wind13.4 mph W
Humidity27%
Visibility—
Dew point42°
Fri, 1488° / 52°0Partly cloudy
88 °Partly cloudy

Grass Valley, Friday, 14 August

Partly cloudy. High 88°, low 52°.

Pressure29.97 inHg
Wind6.8 mph N
Humidity24%
Visibility—
Dew point38°
Sat, 1590° / 53°0Mostly clear
90 °Mostly clear

Grass Valley, Saturday, 15 August

Mostly clear. High 90°, low 53°.

Pressure30.03 inHg
Wind4.4 mph SE
Humidity33%
Visibility—
Dew point46°
Sun, 1689° / 55°0.01Light rain
89 °Light rain

Grass Valley, Sunday, 16 August

Light rain. High 89°, low 55°.

Pressure30.00 inHg
Wind11 mph W
Humidity26%
Visibility—
Dew point43°
Mon, 1796° / 56°0.01Light rain
96 °Light rain

Grass Valley, Monday, 17 August

Light rain. High 96°, low 56°.

Pressure30.03 inHg
Wind10.3 mph W
Humidity26%
Visibility—
Dew point44°
Tue, 1875° / 57°0.16Rain
75 °Rain

Grass Valley, Tuesday, 18 August

Rain. High 75°, low 57°.

Pressure30.03 inHg
Wind7.9 mph NW
Humidity43%
Visibility—
Dew point49°
Wed, 1989° / 51°0Mostly clear
89 °Mostly clear

Grass Valley, Wednesday, 19 August

Mostly clear. High 89°, low 51°.

Pressure30.06 inHg
Wind4 mph N
Humidity37%
Visibility—
Dew point47°
Thu, 2095° / 57°0Partly cloudy
95 °Partly cloudy

Grass Valley, Thursday, 20 August

Partly cloudy. High 95°, low 57°.

Pressure29.91 inHg
Wind10.6 mph NW
Humidity21%
Visibility—
Dew point39°
Fri, 2195° / 61°0Clear
95 °Clear

Grass Valley, Friday, 21 August

Clear. High 95°, low 61°.

Pressure29.94 inHg
Wind11.7 mph W
Humidity24%
Visibility—
Dew point44°
Sat, 2297° / 62°0Partly cloudy
97 °Partly cloudy

Grass Valley, Saturday, 22 August

Partly cloudy. High 97°, low 62°.

Pressure29.97 inHg
Wind6.2 mph NW
Humidity23%
Visibility—
Dew point44°
Sun, 2398° / 63°0Overcast
98 °Overcast

Grass Valley, Sunday, 23 August

Overcast. High 98°, low 63°.

Pressure29.97 inHg
Wind3.5 mph NE
Humidity28%
Visibility—
Dew point49°

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.