As of 04:38 MDT

Weather in Roundup, MT

47°

Roundup, Thursday, 8 October, 04:38

Clear. Feels like 44°. High 79°, low 47°.

Pressure30.00 inHg

Wind6.1 mph SW

Humidity60%

Visibility6.2 mi

Dew point34°

See detailed hourly forecast

Monthly outlook for Roundup, MT: average high 57.8°, average low 39.9°. That is 0.9° below the climate normal for October. Precipitation is expected on 6 days (about 2.2 inches), against a normal of 3 days and 0.7 inches. The warmest day looks like 9 October (83.9°), the coolest 13 October (27.9°).

57.8°/39.9°

Average high / low

−0.9°

Below normal

6 / 3

Wet days / normal

2.2 in

Precipitation this month

Ten-day blocks vs climate normal

Period	Forecast high	Normal	Difference
8 October – 17 October	56.1°	59.8°	-2.1°
18 October – 27 October	60.6°	57.6°	+1.7°
28 October – 6 November	at normal	50.9°	—

October records over 66 years

90.3°1 October 2011All-time high

-15.5°30 October 1991All-time low

Climate normals and records are computed from the nearest reference point — Klein (4 mi).

Fri, 0984° / 47°

84 °

Roundup, Friday, 9 October

Partly cloudy. High 84°, low 47°.

Pressure29.56 inHg

Wind11 mph SW

Humidity20%

Visibility6.2 mi

Dew point32°

Sat, 1062° / 40°

0.14

62 °

Roundup, Saturday, 10 October

Snow. High 62°, low 40°.

Pressure29.62 inHg

Wind10.4 mph NE

Humidity45%

Visibility6.2 mi

Dew point39°

Sun, 1140° / 35°

0.55

40 °

Roundup, Sunday, 11 October

Snow. High 40°, low 35°.

Pressure30.09 inHg

Wind12.3 mph N

Humidity94%

Visibility1.9 mi

Dew point35°

Mon, 1234° / 30°

0.66

34 °

Roundup, Monday, 12 October

Snow. High 34°, low 30°.

Pressure30.21 inHg

Wind12.5 mph NE

Humidity94%

Visibility—

Dew point31°

Tue, 1346° / 28°

46 °

Roundup, Tuesday, 13 October

Overcast. High 46°, low 28°.

Pressure30.12 inHg

Wind7.6 mph W

Humidity85%

Visibility—

Dew point31°

Wed, 1467° / 46°

0.04

67 °

Roundup, Wednesday, 14 October

Light rain. High 67°, low 46°.

Pressure29.32 inHg

Wind21 mph NW

Humidity38%

Visibility—

Dew point39°

Thu, 1542° / 37°

0.56

42 °

Roundup, Thursday, 15 October

Snow. High 42°, low 37°.

Pressure30.00 inHg

Wind28.5 mph NW

Humidity74%

Visibility—

Dew point30°

Fri, 1647° / 31°

47 °

Roundup, Friday, 16 October

Clear. High 47°, low 31°.

Pressure30.42 inHg

Wind7.9 mph SE

Humidity63%

Visibility—

Dew point29°

Sat, 1760° / 34°

60 °

Roundup, Saturday, 17 October

Clear. High 60°, low 34°.

Pressure30.00 inHg

Wind16.7 mph SW

Humidity38%

Visibility—

Dew point28°

Sun, 1858° / 40°

58 °

Roundup, Sunday, 18 October

Mostly clear. High 58°, low 40°.

Pressure30.15 inHg

Wind13.6 mph S

Humidity43%

Visibility—

Dew point30°

Mon, 1963° / 45°

63 °

Roundup, Monday, 19 October

Overcast. High 63°, low 45°.

Pressure30.06 inHg

Wind9.1 mph SW

Humidity34%

Visibility—

Dew point30°

Tue, 2068° / 47°

68 °

Roundup, Tuesday, 20 October

Overcast. High 68°, low 47°.

Pressure29.97 inHg

Wind14.5 mph SW

Humidity33%

Visibility—

Dew point31°

Wed, 2166° / 51°

66 °

Roundup, Wednesday, 21 October

Overcast. High 66°, low 51°.

Pressure29.35 inHg

Wind26.1 mph W

Humidity27%

Visibility—

Dew point28°

Thu, 2254° / 41°

0.03

54 °

Roundup, Thursday, 22 October

Light rain. High 54°, low 41°.

Pressure29.50 inHg

Wind27.2 mph W

Humidity26%

Visibility—

Dew point15°

Fri, 2355° / 39°

0.26

55 °

Roundup, Friday, 23 October

Rain. High 55°, low 39°.

Pressure29.62 inHg

Wind11.8 mph W

Humidity50%

Visibility—

Dew point30°

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

Sat, 2457° / 35°

0.03

57 °

Roundup, Saturday, 24 October

Climate normal for this date — 60-year average.

Average high57°

Average low35°

Average precipitation0.03 in

Chance of precipitation18%

Record high76° (1992)

Record low7° (1975)

Sun, 2556° / 36°

0.03

56 °

Roundup, Sunday, 25 October

Climate normal for this date — 60-year average.

Average high56°

Average low36°

Average precipitation0.03 in

Chance of precipitation20%

Record high75° (2017)

Record low-4° (2020)

Mon, 2655° / 36°

0.04

55 °

Roundup, Monday, 26 October

Climate normal for this date — 60-year average.

Average high55°

Average low36°

Average precipitation0.04 in

Chance of precipitation17%

Record high73° (1960)

Record low-1° (2020)

Tue, 2754° / 33°

0.03

54 °

Roundup, Tuesday, 27 October

Climate normal for this date — 60-year average.

Average high54°

Average low33°

Average precipitation0.03 in

Chance of precipitation15%

Record high71° (2024)

Record low1° (2023)

Wed, 2853° / 33°

0.04

53 °

Roundup, Wednesday, 28 October

Climate normal for this date — 60-year average.

Average high53°

Average low33°

Average precipitation0.04 in

Chance of precipitation22%

Record high74° (1990)

Record low2° (2023)

Thu, 2951° / 33°

0.03

51 °

Roundup, Thursday, 29 October

Climate normal for this date — 60-year average.

Average high51°

Average low33°

Average precipitation0.03 in

Chance of precipitation23%

Record high73° (1987)

Record low-4° (1991)

Fri, 3051° / 31°

0.02

51 °

Roundup, Friday, 30 October

Climate normal for this date — 60-year average.

Average high51°

Average low31°

Average precipitation0.02 in

Chance of precipitation15%

Record high71° (1990)

Record low-16° (1991)

Sat, 3151° / 32°

0.05

51 °

Roundup, Saturday, 31 October

Climate normal for this date — 60-year average.

Average high51°

Average low32°

Average precipitation0.05 in

Chance of precipitation15%

Record high73° (1990)

Record low8° (1984)

Sun, 0151° / 32°

0.02

51 °

Roundup, Sunday, 1 November

Climate normal for this date — 60-year average.

Average high51°

Average low32°

Average precipitation0.02 in

Chance of precipitation13%

Record high70° (1981)

Record low-1° (1991)

Mon, 0250° / 31°

0.01

50 °

Roundup, Monday, 2 November

Climate normal for this date — 60-year average.

Average high50°

Average low31°

Average precipitation0.01 in

Chance of precipitation8%

Record high69° (1965)

Record low-16° (1991)

Tue, 0351° / 31°

0.03

51 °

Roundup, Tuesday, 3 November

Climate normal for this date — 60-year average.

Average high51°

Average low31°

Average precipitation0.03 in

Chance of precipitation17%

Record high69° (1962)

Record low-12° (1991)

Wed, 0451° / 32°

0.03

51 °

Roundup, Wednesday, 4 November

Climate normal for this date — 60-year average.

Average high51°

Average low32°

Average precipitation0.03 in

Chance of precipitation17%

Record high71° (1976)

Record low6° (2003)

Thu, 0550° / 32°

0.05

50 °

Roundup, Thursday, 5 November

Climate normal for this date — 60-year average.

Average high50°

Average low32°

Average precipitation0.05 in

Chance of precipitation25%

Record high69° (2010)

Record low0° (2003)

Fri, 0649° / 30°

0.03

49 °

Roundup, Friday, 6 November

Climate normal for this date — 60-year average.

Average high49°

Average low30°

Average precipitation0.03 in

Chance of precipitation20%

Record high70° (2010)

Record low3° (2003)

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 Roundup, 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 Roundup, 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.