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As of 12:15 MDT

Weather in Waltham, MT

83°Current weather

Waltham, Saturday, 8 August, 12:15

Clear. Feels like 81°. High 85°, low 52°.

Pressure29.97 inHg
Wind9 mph N
Humidity18%
Visibility6.2 mi
Dew point37°
Sun, 0981° / 51°0Clear
81 °Clear

Waltham, Sunday, 9 August

Clear. High 81°, low 51°.

Pressure29.94 inHg
Wind9.9 mph NW
Humidity37%
Visibility6.2 mi
Dew point47°
Mon, 1086° / 46°0Clear
86 °Clear

Waltham, Monday, 10 August

Clear. High 86°, low 46°.

Pressure29.85 inHg
Wind7.9 mph NW
Humidity29%
Visibility6.2 mi
Dew point44°
Tue, 1183° / 57°0Clear
83 °Clear

Waltham, Tuesday, 11 August

Clear. High 83°, low 57°.

Pressure30.03 inHg
Wind6.7 mph N
Humidity36%
Visibility6.2 mi
Dew point45°
Wed, 1283° / 59°0Overcast
83 °Overcast

Waltham, Wednesday, 12 August

Overcast. High 83°, low 59°.

Pressure30.00 inHg
Wind4.2 mph NE
Humidity35%
Visibility6.2 mi
Dew point46°
Thu, 1386° / 54°0.02Light rain
86 °Light rain

Waltham, Thursday, 13 August

Light rain. High 86°, low 54°.

Pressure29.91 inHg
Wind10.8 mph E
Humidity32%
Visibility—
Dew point40°
Fri, 1481° / 59°0Overcast
81 °Overcast

Waltham, Friday, 14 August

Overcast. High 81°, low 59°.

Pressure29.97 inHg
Wind11 mph SE
Humidity28%
Visibility—
Dew point36°
Sat, 1581° / 62°0.05Light rain
81 °Light rain

Waltham, Saturday, 15 August

Light rain. High 81°, low 62°.

Pressure30.00 inHg
Wind14 mph SE
Humidity60%
Visibility—
Dew point51°
Sun, 1688° / 59°0.01Light rain
88 °Light rain

Waltham, Sunday, 16 August

Light rain. High 88°, low 59°.

Pressure29.97 inHg
Wind9.3 mph W
Humidity29%
Visibility—
Dew point44°
Mon, 1787° / 68°0Overcast
87 °Overcast

Waltham, Monday, 17 August

Overcast. High 87°, low 68°.

Pressure30.00 inHg
Wind11.8 mph N
Humidity24%
Visibility—
Dew point40°
Tue, 1887° / 63°0Overcast
87 °Overcast

Waltham, Tuesday, 18 August

Overcast. High 87°, low 63°.

Pressure30.00 inHg
Wind7 mph SE
Humidity27%
Visibility—
Dew point42°
Wed, 1990° / 63°0Overcast
90 °Overcast

Waltham, Wednesday, 19 August

Overcast. High 90°, low 63°.

Pressure29.97 inHg
Wind16.5 mph SE
Humidity30%
Visibility—
Dew point46°
Thu, 2099° / 66°0.04Light rain
99 °Light rain

Waltham, Thursday, 20 August

Light rain. High 99°, low 66°.

Pressure29.83 inHg
Wind17.7 mph SE
Humidity26%
Visibility—
Dew point46°
Fri, 2196° / 71°0.02Light rain
96 °Light rain

Waltham, Friday, 21 August

Light rain. High 96°, low 71°.

Pressure29.77 inHg
Wind16.7 mph SW
Humidity21%
Visibility—
Dew point45°
Sat, 2290° / 66°0.05Light rain
90 °Light rain

Waltham, Saturday, 22 August

Light rain. High 90°, low 66°.

Pressure29.83 inHg
Wind17.1 mph W
Humidity27%
Visibility—
Dew point46°
Sun, 2387° / 60°0Clear
87 °Clear

Waltham, Sunday, 23 August

Clear. High 87°, low 60°.

Pressure29.88 inHg
Wind15.3 mph W
Humidity11%
Visibility—
Dew point19°

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 Waltham, 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 Waltham, 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.