As of 20:49 MDT

Weather in Sidney, MT

61°

Sidney, Thursday, 8 October, 20:49

Overcast. Feels like 59°. High 72°, low 43°.

Pressure29.91 inHg

Wind8.1 mph N

Humidity44%

Visibility6.2 mi

Dew point39°

See detailed hourly forecast

Monthly outlook for Sidney, MT: average high 59.4°, average low 41°. That is 1.1° above the climate normal for October. Precipitation is expected on 3 days (about 1.1 inches), against a normal of 3 days and 0.5 inches. The warmest day looks like 9 October (80.9°), the coolest 14 October (33.2°).

59.4°/41°

Average high / low

+1.1°

Above normal

3 / 3

Wet days / normal

1.1 in

Precipitation this month

Ten-day blocks vs climate normal

Period	Forecast high	Normal	Difference
8 October – 17 October	58°	58.1°	-0°
18 October – 27 October	61.6°	55.1°	+3.6°
28 October – 6 November	at normal	47.9°	—

October records over 66 years

90.7°1 October 1992All-time high

-4.4°31 October 2023All-time low

Fri, 0981° / 47°

81 °

Sidney, Friday, 9 October

Overcast. High 81°, low 47°.

Pressure29.59 inHg

Wind10.4 mph S

Humidity32%

Visibility6.2 mi

Dew point39°

Sat, 1067° / 50°

67 °

Sidney, Saturday, 10 October

Overcast. High 67°, low 50°.

Pressure29.59 inHg

Wind13.6 mph NW

Humidity34%

Visibility6.2 mi

Dew point38°

Sun, 1148° / 42°

0.17

48 °

Sidney, Sunday, 11 October

Light rain. High 48°, low 42°.

Pressure30.06 inHg

Wind11.9 mph N

Humidity91%

Visibility3.3 mi

Dew point42°

Mon, 1241° / 34°

0.74

41 °

Sidney, Monday, 12 October

Snow. High 41°, low 34°.

Pressure30.09 inHg

Wind10.2 mph NE

Humidity100%

Visibility0.2 mi

Dew point35°

Tue, 1345° / 35°

45 °

Sidney, Tuesday, 13 October

Overcast. High 45°, low 35°.

Pressure30.21 inHg

Wind6.3 mph SW

Humidity70%

Visibility—

Dew point31°

Wed, 1463° / 33°

63 °

Sidney, Wednesday, 14 October

Overcast. High 63°, low 33°.

Pressure29.85 inHg

Wind9.3 mph S

Humidity58%

Visibility—

Dew point38°

Thu, 1556° / 40°

0.17

56 °

Sidney, Thursday, 15 October

Light rain. High 56°, low 40°.

Pressure29.97 inHg

Wind21.3 mph N

Humidity83%

Visibility—

Dew point44°

Fri, 1645° / 34°

0.01

45 °

Sidney, Friday, 16 October

Light snow. High 45°, low 34°.

Pressure30.59 inHg

Wind17.2 mph NW

Humidity46%

Visibility—

Dew point21°

Sat, 1763° / 36°

63 °

Sidney, Saturday, 17 October

Overcast. High 63°, low 36°.

Pressure30.15 inHg

Wind17.7 mph SW

Humidity30%

Visibility—

Dew point21°

Sun, 1856° / 44°

56 °

Sidney, Sunday, 18 October

Overcast. High 56°, low 44°.

Pressure30.45 inHg

Wind7.8 mph NW

Humidity35%

Visibility—

Dew point25°

Mon, 1963° / 42°

63 °

Sidney, Monday, 19 October

Clear. High 63°, low 42°.

Pressure30.15 inHg

Wind20.7 mph S

Humidity27%

Visibility—

Dew point22°

Tue, 2062° / 45°

62 °

Sidney, Tuesday, 20 October

Clear. High 62°, low 45°.

Pressure29.88 inHg

Wind18.8 mph NW

Humidity38%

Visibility—

Dew point29°

Wed, 2157° / 45°

57 °

Sidney, Wednesday, 21 October

Overcast. High 57°, low 45°.

Pressure30.21 inHg

Wind6.7 mph N

Humidity35%

Visibility—

Dew point26°

Thu, 2257° / 40°

57 °

Sidney, Thursday, 22 October

Clear. High 57°, low 40°.

Pressure30.39 inHg

Wind9.1 mph SE

Humidity37%

Visibility—

Dew point25°

Fri, 2374° / 47°

74 °

Sidney, Friday, 23 October

Clear. High 74°, low 47°.

Pressure29.80 inHg

Wind15.9 mph W

Humidity24%

Visibility—

Dew point26°

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

Sat, 2453° / 36°

0.02

53 °

Sidney, Saturday, 24 October

Climate normal for this date — 60-year average.

Average high53°

Average low36°

Average precipitation0.02 in

Chance of precipitation15%

Record high78° (1992)

Record low15° (2002)

Sun, 2554° / 36°

0.02

54 °

Sidney, Sunday, 25 October

Climate normal for this date — 60-year average.

Average high54°

Average low36°

Average precipitation0.02 in

Chance of precipitation12%

Record high74° (1990)

Record low11° (2020)

Mon, 2654° / 36°

0.04

54 °

Sidney, Monday, 26 October

Climate normal for this date — 60-year average.

Average high54°

Average low36°

Average precipitation0.04 in

Chance of precipitation20%

Record high75° (1966)

Record low8° (2020)

Tue, 2752° / 34°

0.05

52 °

Sidney, Tuesday, 27 October

Climate normal for this date — 60-year average.

Average high52°

Average low34°

Average precipitation0.05 in

Chance of precipitation23%

Record high77° (1983)

Record low8° (2023)

Wed, 2851° / 34°

0.04

51 °

Sidney, Wednesday, 28 October

Climate normal for this date — 60-year average.

Average high51°

Average low34°

Average precipitation0.04 in

Chance of precipitation12%

Record high75° (1990)

Record low10° (2023)

Thu, 2949° / 33°

0.06

49 °

Sidney, Thursday, 29 October

Climate normal for this date — 60-year average.

Average high49°

Average low33°

Average precipitation0.06 in

Chance of precipitation23%

Record high73° (1968)

Record low9° (1991)

Fri, 3049° / 32°

0.02

49 °

Sidney, Friday, 30 October

Climate normal for this date — 60-year average.

Average high49°

Average low32°

Average precipitation0.02 in

Chance of precipitation10%

Record high69° (1983)

Record low-2° (1991)

Sat, 3149° / 31°

0.03

49 °

Sidney, Saturday, 31 October

Climate normal for this date — 60-year average.

Average high49°

Average low31°

Average precipitation0.03 in

Chance of precipitation17%

Record high77° (1990)

Record low-4° (2023)

Sun, 0148° / 32°

0.04

48 °

Sidney, Sunday, 1 November

Climate normal for this date — 60-year average.

Average high48°

Average low32°

Average precipitation0.04 in

Chance of precipitation17%

Record high71° (1965)

Record low3° (1984)

Mon, 0247° / 31°

0.03

47 °

Sidney, Monday, 2 November

Climate normal for this date — 60-year average.

Average high47°

Average low31°

Average precipitation0.03 in

Chance of precipitation15%

Record high73° (1965)

Record low2° (1991)

Tue, 0346° / 31°

0.02

46 °

Sidney, Tuesday, 3 November

Climate normal for this date — 60-year average.

Average high46°

Average low31°

Average precipitation0.02 in

Chance of precipitation15%

Record high68° (2020)

Record low-7° (1991)

Wed, 0448° / 30°

0.03

48 °

Sidney, Wednesday, 4 November

Climate normal for this date — 60-year average.

Average high48°

Average low30°

Average precipitation0.03 in

Chance of precipitation20%

Record high69° (1975)

Record low4° (1991)

Thu, 0547° / 30°

0.02

47 °

Sidney, Thursday, 5 November

Climate normal for this date — 60-year average.

Average high47°

Average low30°

Average precipitation0.02 in

Chance of precipitation17%

Record high69° (1975)

Record low1° (2003)

Fri, 0646° / 28°

0.02

46 °

Sidney, Friday, 6 November

Climate normal for this date — 60-year average.

Average high46°

Average low28°

Average precipitation0.02 in

Chance of precipitation17%

Record high69° (2009)

Record low0° (1991)

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 Sidney, 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 Sidney, 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.