As of 09:01 MDT

Weather in Potomac, MT

43°

Potomac, Friday, 9 October, 09:01

Overcast. Feels like 43°. High 70°, low 42°.

Pressure29.74 inHg

Wind2 mph SW

Humidity70%

Visibility6.2 mi

Dew point35°

See detailed hourly forecast

Monthly outlook for Potomac, MT: average high 55.2°, average low 33.2°. That is 0.2° below the climate normal for October. Precipitation is expected on 3 days (about 0.9 inches), against a normal of 5 days and 0.9 inches. The warmest day looks like 9 October (70.2°), the coolest 13 October (22.8°).

55.2°/33.2°

Average high / low

−0.2°

Below normal

3 / 5

Wet days / normal

0.9 in

Precipitation this month

Ten-day blocks vs climate normal

Period	Forecast high	Normal	Difference
9 October – 18 October	51.4°	56.4°	-2.8°
19 October – 28 October	61.6°	52.4°	+5.1°
29 October – 7 November	at normal	45.8°	—

October records over 66 years

84.4°1 October 1992All-time high

-9.6°25 October 2020All-time low

Sat, 1046° / 28°

0.52

46 °

Potomac, Saturday, 10 October

Snow. High 46°, low 28°.

Pressure29.74 inHg

Wind4.4 mph SE

Humidity97%

Visibility2.4 mi

Dew point40°

Sun, 1132° / 26°

0.27

32 °

Potomac, Sunday, 11 October

Snow. High 32°, low 26°.

Pressure30.03 inHg

Wind7.7 mph NE

Humidity85%

Visibility6.1 mi

Dew point23°

Mon, 1237° / 27°

0.11

37 °

Potomac, Monday, 12 October

Snow. High 37°, low 27°.

Pressure30.15 inHg

Wind2.3 mph NE

Humidity84%

Visibility6.2 mi

Dew point25°

Tue, 1344° / 23°

44 °

Potomac, Tuesday, 13 October

Clear. High 44°, low 23°.

Pressure30.18 inHg

Wind2.6 mph S

Humidity72%

Visibility—

Dew point27°

Wed, 1448° / 24°

48 °

Potomac, Wednesday, 14 October

Clear. High 48°, low 24°.

Pressure30.18 inHg

Wind7.2 mph SW

Humidity61%

Visibility—

Dew point27°

Thu, 1554° / 29°

54 °

Potomac, Thursday, 15 October

Mostly clear. High 54°, low 29°.

Pressure30.33 inHg

Wind4.5 mph E

Humidity74%

Visibility—

Dew point38°

Fri, 1652° / 28°

52 °

Potomac, Friday, 16 October

Overcast. High 52°, low 28°.

Pressure30.59 inHg

Wind3.6 mph E

Humidity57%

Visibility—

Dew point27°

Sat, 1764° / 37°

64 °

Potomac, Saturday, 17 October

Mostly clear. High 64°, low 37°.

Pressure30.18 inHg

Wind3.4 mph W

Humidity43%

Visibility—

Dew point32°

Sun, 1866° / 42°

66 °

Potomac, Sunday, 18 October

Overcast. High 66°, low 42°.

Pressure30.00 inHg

Wind1.6 mph W

Humidity48%

Visibility—

Dew point36°

Mon, 1963° / 43°

63 °

Potomac, Monday, 19 October

Overcast. High 63°, low 43°.

Pressure29.85 inHg

Wind8 mph NW

Humidity33%

Visibility—

Dew point28°

Tue, 2056° / 38°

56 °

Potomac, Tuesday, 20 October

Clear. High 56°, low 38°.

Pressure30.15 inHg

Wind7.7 mph W

Humidity43%

Visibility—

Dew point28°

Wed, 2163° / 37°

63 °

Potomac, Wednesday, 21 October

Overcast. High 63°, low 37°.

Pressure30.03 inHg

Wind15.9 mph W

Humidity34%

Visibility—

Dew point25°

Thu, 2255° / 35°

55 °

Potomac, Thursday, 22 October

Overcast. High 55°, low 35°.

Pressure30.39 inHg

Wind3.8 mph E

Humidity49%

Visibility—

Dew point29°

Fri, 2364° / 34°

64 °

Potomac, Friday, 23 October

Mostly clear. High 64°, low 34°.

Pressure30.15 inHg

Wind1.7 mph W

Humidity31%

Visibility—

Dew point23°

Sat, 2468° / 39°

68 °

Potomac, Saturday, 24 October

Clear. High 68°, low 39°.

Pressure30.06 inHg

Wind2.1 mph W

Humidity28%

Visibility—

Dew point24°

From day 17 onward the outlook is built from 60-year climate statistics

Sun, 2551° / 33°

0.05

51 °

Potomac, Sunday, 25 October

Climate normal for this date — 60-year average.

Average high51°

Average low33°

Average precipitation0.05 in

Chance of precipitation35%

Record high68° (2005)

Record low-10° (2020)

Mon, 2650° / 33°

0.07

50 °

Potomac, Monday, 26 October

Climate normal for this date — 60-year average.

Average high50°

Average low33°

Average precipitation0.07 in

Chance of precipitation37%

Record high67° (1986)

Record low-10° (2020)

Tue, 2749° / 31°

0.06

49 °

Potomac, Tuesday, 27 October

Climate normal for this date — 60-year average.

Average high49°

Average low31°

Average precipitation0.06 in

Chance of precipitation30%

Record high66° (2024)

Record low9° (1975)

Wed, 2849° / 31°

0.07

49 °

Potomac, Wednesday, 28 October

Climate normal for this date — 60-year average.

Average high49°

Average low31°

Average precipitation0.07 in

Chance of precipitation27%

Record high64° (2008)

Record low11° (1991)

Thu, 2948° / 30°

0.05

48 °

Potomac, Thursday, 29 October

Climate normal for this date — 60-year average.

Average high48°

Average low30°

Average precipitation0.05 in

Chance of precipitation33%

Record high65° (2021)

Record low3° (1991)

Fri, 3047° / 29°

0.04

47 °

Potomac, Friday, 30 October

Climate normal for this date — 60-year average.

Average high47°

Average low29°

Average precipitation0.04 in

Chance of precipitation23%

Record high65° (2008)

Record low1° (1996)

Sat, 3146° / 30°

0.07

46 °

Potomac, Saturday, 31 October

Climate normal for this date — 60-year average.

Average high46°

Average low30°

Average precipitation0.07 in

Chance of precipitation32%

Record high64° (2014)

Record low-1° (1996)

Sun, 0147° / 30°

0.08

47 °

Potomac, Sunday, 1 November

Climate normal for this date — 60-year average.

Average high47°

Average low30°

Average precipitation0.08 in

Chance of precipitation32%

Record high64° (1988)

Record low2° (1984)

Mon, 0246° / 30°

0.07

46 °

Potomac, Monday, 2 November

Climate normal for this date — 60-year average.

Average high46°

Average low30°

Average precipitation0.07 in

Chance of precipitation35%

Record high62° (1981)

Record low1° (1991)

Tue, 0346° / 30°

0.03

46 °

Potomac, Tuesday, 3 November

Climate normal for this date — 60-year average.

Average high46°

Average low30°

Average precipitation0.03 in

Chance of precipitation23%

Record high62° (2020)

Record low-2° (1973)

Wed, 0446° / 31°

0.07

46 °

Potomac, Wednesday, 4 November

Climate normal for this date — 60-year average.

Average high46°

Average low31°

Average precipitation0.07 in

Chance of precipitation43%

Record high60° (2020)

Record low-6° (1973)

Thu, 0545° / 30°

0.07

45 °

Potomac, Thursday, 5 November

Climate normal for this date — 60-year average.

Average high45°

Average low30°

Average precipitation0.07 in

Chance of precipitation37%

Record high65° (2020)

Record low0° (1961)

Fri, 0644° / 29°

0.07

44 °

Potomac, Friday, 6 November

Climate normal for this date — 60-year average.

Average high44°

Average low29°

Average precipitation0.07 in

Chance of precipitation42%

Record high62° (2012)

Record low11° (2003)

Sat, 0743° / 29°

0.09

43 °

Potomac, Saturday, 7 November

Climate normal for this date — 60-year average.

Average high43°

Average low29°

Average precipitation0.09 in

Chance of precipitation43%

Record high57° (2010)

Record low5° (1961)

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 Potomac, 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 Potomac, 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.