EN
English Español

As of 23:43 MDT

Weather in Lewistown, MT

62°Current weather

Lewistown, Saturday, 8 August, 23:43

Overcast. Feels like 60°. High 85°, low 54°.

Pressure29.88 inHg
Wind6.8 mph SE
Humidity49%
Visibility6.2 mi
Dew point43°
Sun, 0983° / 52°0Clear
83 °Clear

Lewistown, Sunday, 9 August

Clear. High 83°, low 52°.

Pressure29.85 inHg
Wind14.3 mph NW
Humidity17%
Visibility6.2 mi
Dew point33°
Mon, 1090° / 48°0Clear
90 °Clear

Lewistown, Monday, 10 August

Clear. High 90°, low 48°.

Pressure29.80 inHg
Wind4.5 mph W
Humidity20%
Visibility6.2 mi
Dew point39°
Tue, 1186° / 61°0Clear
86 °Clear

Lewistown, Tuesday, 11 August

Clear. High 86°, low 61°.

Pressure29.91 inHg
Wind8.9 mph NW
Humidity23%
Visibility6.2 mi
Dew point40°
Wed, 1287° / 60°0.08Light rain
87 °Light rain

Lewistown, Wednesday, 12 August

Light rain. High 87°, low 60°.

Pressure29.80 inHg
Wind9 mph NE
Humidity23%
Visibility6.2 mi
Dew point42°
Thu, 1383° / 58°0.7Heavy rain
83 °Heavy rain

Lewistown, Thursday, 13 August

Heavy rain. High 83°, low 58°.

Pressure29.80 inHg
Wind14.5 mph E
Humidity47%
Visibility—
Dew point54°
Fri, 1469° / 57°0.01Light rain
69 °Light rain

Lewistown, Friday, 14 August

Light rain. High 69°, low 57°.

Pressure30.09 inHg
Wind7.6 mph NW
Humidity83%
Visibility—
Dew point54°
Sat, 1578° / 53°0.04Light rain
78 °Light rain

Lewistown, Saturday, 15 August

Light rain. High 78°, low 53°.

Pressure30.12 inHg
Wind7.3 mph E
Humidity49%
Visibility—
Dew point49°
Sun, 1688° / 59°0Partly cloudy
88 °Partly cloudy

Lewistown, Sunday, 16 August

Partly cloudy. High 88°, low 59°.

Pressure29.94 inHg
Wind9.7 mph S
Humidity28%
Visibility—
Dew point43°
Mon, 1789° / 66°0Mostly clear
89 °Mostly clear

Lewistown, Monday, 17 August

Mostly clear. High 89°, low 66°.

Pressure29.94 inHg
Wind11.3 mph N
Humidity20%
Visibility—
Dew point37°
Tue, 1870° / 59°0.03Light rain
70 °Light rain

Lewistown, Tuesday, 18 August

Light rain. High 70°, low 59°.

Pressure30.15 inHg
Wind7.9 mph SE
Humidity78%
Visibility—
Dew point54°
Wed, 1985° / 58°0.02Light rain
85 °Light rain

Lewistown, Wednesday, 19 August

Light rain. High 85°, low 58°.

Pressure29.91 inHg
Wind15.8 mph NW
Humidity39%
Visibility—
Dew point48°
Thu, 2085° / 61°0Overcast
85 °Overcast

Lewistown, Thursday, 20 August

Overcast. High 85°, low 61°.

Pressure29.83 inHg
Wind8.6 mph N
Humidity21%
Visibility—
Dew point36°
Fri, 2179° / 62°0.02Light rain
79 °Light rain

Lewistown, Friday, 21 August

Light rain. High 79°, low 62°.

Pressure29.80 inHg
Wind20.1 mph NW
Humidity26%
Visibility—
Dew point38°
Sat, 2281° / 51°0Clear
81 °Clear

Lewistown, Saturday, 22 August

Clear. High 81°, low 51°.

Pressure29.94 inHg
Wind8.1 mph E
Humidity37%
Visibility—
Dew point42°
Sun, 2392° / 62°0Overcast
92 °Overcast

Lewistown, Sunday, 23 August

Overcast. High 92°, low 62°.

Pressure29.74 inHg
Wind21.2 mph NW
Humidity13%
Visibility—
Dew point26°

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 Lewistown, 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 Lewistown, 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.