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As of 11:21 MDT

Weather in Grannis, MT

80°Current weather

Grannis, Saturday, 8 August, 11:21

Clear. Feels like 80°. High 90°, low 57°.

Pressure29.85 inHg
Wind15.3 mph W
Humidity27%
Visibility6.2 mi
Dew point35°
Sun, 0986° / 57°0Overcast
86 °Overcast

Grannis, Sunday, 9 August

Overcast. High 86°, low 57°.

Pressure29.83 inHg
Wind5 mph NW
Humidity11%
Visibility6.2 mi
Dew point25°
Mon, 1095° / 54°0Clear
95 °Clear

Grannis, Monday, 10 August

Clear. High 95°, low 54°.

Pressure29.77 inHg
Wind5.7 mph NW
Humidity12%
Visibility6.2 mi
Dew point26°
Tue, 1191° / 55°0Clear
91 °Clear

Grannis, Tuesday, 11 August

Clear. High 91°, low 55°.

Pressure29.91 inHg
Wind6.1 mph NW
Humidity12%
Visibility6.2 mi
Dew point26°
Wed, 1284° / 54°0Overcast
84 °Overcast

Grannis, Wednesday, 12 August

Overcast. High 84°, low 54°.

Pressure29.94 inHg
Wind24.4 mph E
Humidity28%
Visibility—
Dew point39°
Thu, 1384° / 48°0Mostly clear
84 °Mostly clear

Grannis, Thursday, 13 August

Mostly clear. High 84°, low 48°.

Pressure29.97 inHg
Wind24.6 mph E
Humidity33%
Visibility—
Dew point38°
Fri, 1483° / 55°0.02Light rain
83 °Light rain

Grannis, Friday, 14 August

Light rain. High 83°, low 55°.

Pressure29.83 inHg
Wind11.4 mph S
Humidity25%
Visibility—
Dew point40°
Sat, 1577° / 61°0.06Light rain
77 °Light rain

Grannis, Saturday, 15 August

Light rain. High 77°, low 61°.

Pressure29.94 inHg
Wind16.4 mph W
Humidity38%
Visibility—
Dew point48°
Sun, 1686° / 53°0Clear
86 °Clear

Grannis, Sunday, 16 August

Clear. High 86°, low 53°.

Pressure30.00 inHg
Wind15 mph W
Humidity26%
Visibility—
Dew point39°
Mon, 1790° / 59°0Overcast
90 °Overcast

Grannis, Monday, 17 August

Overcast. High 90°, low 59°.

Pressure29.91 inHg
Wind16.5 mph NW
Humidity14%
Visibility—
Dew point30°
Tue, 1875° / 61°0.02Light rain
75 °Light rain

Grannis, Tuesday, 18 August

Light rain. High 75°, low 61°.

Pressure30.03 inHg
Wind10.6 mph E
Humidity32%
Visibility—
Dew point42°
Wed, 1984° / 54°0Mostly clear
84 °Mostly clear

Grannis, Wednesday, 19 August

Mostly clear. High 84°, low 54°.

Pressure30.03 inHg
Wind21.3 mph E
Humidity36%
Visibility—
Dew point45°
Thu, 2095° / 55°0.19Rain
95 °Rain

Grannis, Thursday, 20 August

Rain. High 95°, low 55°.

Pressure29.85 inHg
Wind6.2 mph E
Humidity25%
Visibility—
Dew point42°
Fri, 2182° / 63°0.01Light rain
82 °Light rain

Grannis, Friday, 21 August

Light rain. High 82°, low 63°.

Pressure29.88 inHg
Wind8.5 mph SW
Humidity33%
Visibility—
Dew point48°
Sat, 2285° / 59°0.74Heavy rain
85 °Heavy rain

Grannis, Saturday, 22 August

Heavy rain. High 85°, low 59°.

Pressure29.88 inHg
Wind10.4 mph SE
Humidity31%
Visibility—
Dew point47°
Sun, 2383° / 56°0Clear
83 °Clear

Grannis, Sunday, 23 August

Clear. High 83°, low 56°.

Pressure29.91 inHg
Wind13.9 mph W
Humidity35%
Visibility—
Dew point44°

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 Grannis, 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 Grannis, 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.