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As of 13:30 MDT

Weather in Sumner, MT

82°Current weather

Sumner, Saturday, 8 August, 13:30

Partly cloudy. Feels like 80°. High 84°, low 54°.

Pressure29.83 inHg
Wind8.7 mph NE
Humidity25%
Visibility6.2 mi
Dew point42°
Sun, 0983° / 57°0Clear
83 °Clear

Sumner, Sunday, 9 August

Clear. High 83°, low 57°.

Pressure29.83 inHg
Wind10 mph S
Humidity30%
Visibility6.2 mi
Dew point46°
Mon, 1082° / 49°0Clear
82 °Clear

Sumner, Monday, 10 August

Clear. High 82°, low 49°.

Pressure29.91 inHg
Wind11.2 mph E
Humidity37%
Visibility6.2 mi
Dew point45°
Tue, 1182° / 58°0Clear
82 °Clear

Sumner, Tuesday, 11 August

Clear. High 82°, low 58°.

Pressure29.94 inHg
Wind8.5 mph N
Humidity31%
Visibility6.2 mi
Dew point44°
Wed, 1281° / 59°0Partly cloudy
81 °Partly cloudy

Sumner, Wednesday, 12 August

Partly cloudy. High 81°, low 59°.

Pressure29.94 inHg
Wind14.1 mph E
Humidity34%
Visibility6.2 mi
Dew point47°
Thu, 1382° / 57°0.01Light rain
82 °Light rain

Sumner, Thursday, 13 August

Light rain. High 82°, low 57°.

Pressure30.00 inHg
Wind22.6 mph SE
Humidity32%
Visibility—
Dew point41°
Fri, 1484° / 66°0.26Rain
84 °Rain

Sumner, Friday, 14 August

Rain. High 84°, low 66°.

Pressure29.88 inHg
Wind22.5 mph SE
Humidity63%
Visibility—
Dew point57°
Sat, 1577° / 57°0Overcast
77 °Overcast

Sumner, Saturday, 15 August

Overcast. High 77°, low 57°.

Pressure30.06 inHg
Wind11.4 mph NE
Humidity36%
Visibility—
Dew point41°
Sun, 1685° / 59°0.04Light rain
85 °Light rain

Sumner, Sunday, 16 August

Light rain. High 85°, low 59°.

Pressure29.94 inHg
Wind16 mph W
Humidity44%
Visibility—
Dew point52°
Mon, 1786° / 66°0Partly cloudy
86 °Partly cloudy

Sumner, Monday, 17 August

Partly cloudy. High 86°, low 66°.

Pressure29.94 inHg
Wind16.3 mph NW
Humidity21%
Visibility—
Dew point37°
Tue, 1885° / 65°0Overcast
85 °Overcast

Sumner, Tuesday, 18 August

Overcast. High 85°, low 65°.

Pressure29.94 inHg
Wind13.7 mph SE
Humidity29%
Visibility—
Dew point45°
Wed, 1976° / 63°0.13Light rain
76 °Light rain

Sumner, Wednesday, 19 August

Light rain. High 76°, low 63°.

Pressure30.06 inHg
Wind10.6 mph S
Humidity73%
Visibility—
Dew point57°
Thu, 2087° / 63°0Overcast
87 °Overcast

Sumner, Thursday, 20 August

Overcast. High 87°, low 63°.

Pressure29.91 inHg
Wind13.3 mph SE
Humidity38%
Visibility—
Dew point50°
Fri, 2185° / 70°0Mostly clear
85 °Mostly clear

Sumner, Friday, 21 August

Mostly clear. High 85°, low 70°.

Pressure29.88 inHg
Wind16 mph NE
Humidity32%
Visibility—
Dew point49°
Sat, 2277° / 58°0Overcast
77 °Overcast

Sumner, Saturday, 22 August

Overcast. High 77°, low 58°.

Pressure30.06 inHg
Wind17.2 mph SE
Humidity50%
Visibility—
Dew point48°
Sun, 2384° / 60°0Clear
84 °Clear

Sumner, Sunday, 23 August

Clear. High 84°, low 60°.

Pressure30.09 inHg
Wind17 mph NE
Humidity31%
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 Sumner, 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 Sumner, 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.