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As of 12:22 MDT

Weather in Roy, MT

78°Current weather

Roy, Saturday, 8 August, 12:22

Clear. Feels like 77°. High 87°, low 54°.

Pressure29.83 inHg
Wind18.1 mph NW
Humidity19%
Visibility6.2 mi
Dew point32°
Sun, 0983° / 55°0Clear
83 °Clear

Roy, Sunday, 9 August

Clear. High 83°, low 55°.

Pressure29.85 inHg
Wind23 mph NW
Humidity25%
Visibility6.2 mi
Dew point41°
Mon, 1085° / 48°0Clear
85 °Clear

Roy, Monday, 10 August

Clear. High 85°, low 48°.

Pressure29.85 inHg
Wind8.5 mph E
Humidity31%
Visibility6.2 mi
Dew point43°
Tue, 1184° / 60°0Clear
84 °Clear

Roy, Tuesday, 11 August

Clear. High 84°, low 60°.

Pressure29.97 inHg
Wind14.7 mph NW
Humidity30%
Visibility6.2 mi
Dew point44°
Wed, 1276° / 58°0Overcast
76 °Overcast

Roy, Wednesday, 12 August

Overcast. High 76°, low 58°.

Pressure30.03 inHg
Wind13.8 mph E
Humidity35%
Visibility6.2 mi
Dew point43°
Thu, 1380° / 53°0Mostly clear
80 °Mostly clear

Roy, Thursday, 13 August

Mostly clear. High 80°, low 53°.

Pressure30.00 inHg
Wind19.5 mph SE
Humidity29%
Visibility—
Dew point36°
Fri, 1479° / 55°0Overcast
79 °Overcast

Roy, Friday, 14 August

Overcast. High 79°, low 55°.

Pressure29.94 inHg
Wind10.7 mph E
Humidity35%
Visibility—
Dew point42°
Sat, 1578° / 60°0.26Rain
78 °Rain

Roy, Saturday, 15 August

Rain. High 78°, low 60°.

Pressure30.00 inHg
Wind16 mph SE
Humidity41%
Visibility—
Dew point46°
Sun, 1685° / 58°0.06Light rain
85 °Light rain

Roy, Sunday, 16 August

Light rain. High 85°, low 58°.

Pressure29.97 inHg
Wind11 mph NW
Humidity38%
Visibility—
Dew point48°
Mon, 1787° / 69°0Overcast
87 °Overcast

Roy, Monday, 17 August

Overcast. High 87°, low 69°.

Pressure29.91 inHg
Wind19.2 mph NW
Humidity19%
Visibility—
Dew point37°
Tue, 1881° / 63°0Overcast
81 °Overcast

Roy, Tuesday, 18 August

Overcast. High 81°, low 63°.

Pressure30.06 inHg
Wind14.2 mph E
Humidity38%
Visibility—
Dew point46°
Wed, 1982° / 65°0Overcast
82 °Overcast

Roy, Wednesday, 19 August

Overcast. High 82°, low 65°.

Pressure30.09 inHg
Wind17.5 mph SE
Humidity42%
Visibility—
Dew point49°
Thu, 2090° / 62°0Mostly clear
90 °Mostly clear

Roy, Thursday, 20 August

Mostly clear. High 90°, low 62°.

Pressure29.88 inHg
Wind13.4 mph SE
Humidity36%
Visibility—
Dew point50°
Fri, 2195° / 70°0.04Light rain
95 °Light rain

Roy, Friday, 21 August

Light rain. High 95°, low 70°.

Pressure29.77 inHg
Wind30.2 mph W
Humidity24%
Visibility—
Dew point47°
Sat, 2291° / 66°0.03Light rain
91 °Light rain

Roy, Saturday, 22 August

Light rain. High 91°, low 66°.

Pressure29.83 inHg
Wind11.7 mph NW
Humidity30%
Visibility—
Dew point48°
Sun, 2386° / 64°0.02Light rain
86 °Light rain

Roy, Sunday, 23 August

Light rain. High 86°, low 64°.

Pressure29.85 inHg
Wind15.5 mph W
Humidity18%
Visibility—
Dew point31°

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 Roy, 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 Roy, 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.