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As of 13:57 MDT

Weather in Keystone, MT

78°Current weather

Keystone, Saturday, 8 August, 13:57

Clear. Feels like 77°. High 81°, low 46°.

Pressure29.83 inHg
Wind8.8 mph W
Humidity17%
Visibility6.2 mi
Dew point30°
Sun, 0982° / 45°0Clear
82 °Clear

Keystone, Sunday, 9 August

Clear. High 82°, low 45°.

Pressure29.85 inHg
Wind2.4 mph N
Humidity15%
Visibility6.2 mi
Dew point32°
Mon, 1082° / 44°0Clear
82 °Clear

Keystone, Monday, 10 August

Clear. High 82°, low 44°.

Pressure29.85 inHg
Wind4.8 mph W
Humidity15%
Visibility6.2 mi
Dew point29°
Tue, 1185° / 48°0Clear
85 °Clear

Keystone, Tuesday, 11 August

Clear. High 85°, low 48°.

Pressure29.94 inHg
Wind3 mph N
Humidity18%
Visibility6.2 mi
Dew point33°
Wed, 1285° / 50°0Partly cloudy
85 °Partly cloudy

Keystone, Wednesday, 12 August

Partly cloudy. High 85°, low 50°.

Pressure29.85 inHg
Wind3.9 mph N
Humidity20%
Visibility6.2 mi
Dew point36°
Thu, 1383° / 47°0Clear
83 °Clear

Keystone, Thursday, 13 August

Clear. High 83°, low 47°.

Pressure29.83 inHg
Wind11.1 mph W
Humidity30%
Visibility—
Dew point38°
Fri, 1483° / 46°0Mostly clear
83 °Mostly clear

Keystone, Friday, 14 August

Mostly clear. High 83°, low 46°.

Pressure29.91 inHg
Wind5.5 mph NW
Humidity15%
Visibility—
Dew point22°
Sat, 1574° / 52°0Overcast
74 °Overcast

Keystone, Saturday, 15 August

Overcast. High 74°, low 52°.

Pressure29.94 inHg
Wind10.8 mph SW
Humidity21%
Visibility—
Dew point28°
Sun, 1682° / 47°0Clear
82 °Clear

Keystone, Sunday, 16 August

Clear. High 82°, low 47°.

Pressure30.00 inHg
Wind11.8 mph W
Humidity24%
Visibility—
Dew point35°
Mon, 1788° / 51°0Mostly clear
88 °Mostly clear

Keystone, Monday, 17 August

Mostly clear. High 88°, low 51°.

Pressure30.00 inHg
Wind8.7 mph W
Humidity20%
Visibility—
Dew point33°
Tue, 1862° / 51°0.32Rain
62 °Rain

Keystone, Tuesday, 18 August

Rain. High 62°, low 51°.

Pressure30.12 inHg
Wind5 mph W
Humidity88%
Visibility—
Dew point53°
Wed, 1981° / 44°0Mostly clear
81 °Mostly clear

Keystone, Wednesday, 19 August

Mostly clear. High 81°, low 44°.

Pressure30.06 inHg
Wind4.6 mph NE
Humidity33%
Visibility—
Dew point39°
Thu, 2087° / 53°0Overcast
87 °Overcast

Keystone, Thursday, 20 August

Overcast. High 87°, low 53°.

Pressure29.91 inHg
Wind8 mph W
Humidity21%
Visibility—
Dew point35°
Fri, 2188° / 54°0Clear
88 °Clear

Keystone, Friday, 21 August

Clear. High 88°, low 54°.

Pressure29.94 inHg
Wind7.2 mph W
Humidity22%
Visibility—
Dew point36°
Sat, 2289° / 55°0Mostly clear
89 °Mostly clear

Keystone, Saturday, 22 August

Mostly clear. High 89°, low 55°.

Pressure29.94 inHg
Wind5.1 mph NW
Humidity21%
Visibility—
Dew point36°
Sun, 2390° / 55°0Overcast
90 °Overcast

Keystone, Sunday, 23 August

Overcast. High 90°, low 55°.

Pressure29.97 inHg
Wind5.6 mph NE
Humidity25%
Visibility—
Dew point39°

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 Keystone, 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 Keystone, 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.