Monthly outlook for Perth, ND: average high 54.4°, average low 39°. That is 1.3° above the climate normal for October. Precipitation is expected on 1 day (about 0.1 inches), against a normal of 3 days and 0.8 inches. The warmest day looks like 14 October (69.7°), the coolest 17 October (28.9°).
54.4°/39°
Average high / low
+1.3°
Above normal
1 / 3
Wet days / normal
0.1 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
7 October – 16 October
55.7°
53.1°
+1.5°
17 October – 26 October
52.1°
49.1°
+1.6°
27 October – 5 November
at normal
42.4°
—
October records over 66 years
86.5°4 October 1963All-time high
-1.7°30 October 1991All-time low
Climate normals and records are computed from the nearest reference point — Bisbee (7 mi).
Thu, 0857° / 42°0
57 °
Perth, Thursday, 8 October
Overcast. High 57°, low 42°.
Pressure30.09 inHg
Wind5.8 mph SW
Humidity69%
Visibility6.2 mi
Dew point40°
Fri, 0964° / 44°0
64 °
Perth, Friday, 9 October
Overcast. High 64°, low 44°.
Pressure29.80 inHg
Wind6.6 mph E
Humidity63%
Visibility6.2 mi
Dew point44°
Sat, 1069° / 50°0
69 °
Perth, Saturday, 10 October
Overcast. High 69°, low 50°.
Pressure29.53 inHg
Wind7.9 mph E
Humidity96%
Visibility6.2 mi
Dew point57°
Sun, 1156° / 40°0.07
56 °
Perth, Sunday, 11 October
Light rain. High 56°, low 40°.
Pressure29.97 inHg
Wind14 mph N
Humidity73%
Visibility—
Dew point36°
Mon, 1242° / 36°0
42 °
Perth, Monday, 12 October
Overcast. High 42°, low 36°.
Pressure30.21 inHg
Wind12.4 mph N
Humidity70%
Visibility—
Dew point30°
Tue, 1355° / 32°0
55 °
Perth, Tuesday, 13 October
Clear. High 55°, low 32°.
Pressure30.00 inHg
Wind11.3 mph S
Humidity58%
Visibility—
Dew point33°
Wed, 1470° / 44°0
70 °
Perth, Wednesday, 14 October
Partly cloudy. High 70°, low 44°.
Pressure29.53 inHg
Wind19.8 mph W
Humidity64%
Visibility—
Dew point49°
Thu, 1547° / 33°0.01
47 °
Perth, Thursday, 15 October
Light snow. High 47°, low 33°.
Pressure29.80 inHg
Wind28 mph W
Humidity57%
Visibility—
Dew point26°
Fri, 1637° / 31°0.02
37 °
Perth, Friday, 16 October
Light snow. High 37°, low 31°.
Pressure29.91 inHg
Wind25.8 mph NW
Humidity72%
Visibility—
Dew point26°
Sat, 1746° / 29°0
46 °
Perth, Saturday, 17 October
Mostly clear. High 46°, low 29°.
Pressure30.27 inHg
Wind16.1 mph NW
Humidity43%
Visibility—
Dew point19°
Sun, 1854° / 40°0
54 °
Perth, Sunday, 18 October
Clear. High 54°, low 40°.
Pressure29.85 inHg
Wind17.9 mph NW
Humidity48%
Visibility—
Dew point32°
Mon, 1946° / 34°0
46 °
Perth, Monday, 19 October
Overcast. High 46°, low 34°.
Pressure30.15 inHg
Wind7.2 mph NE
Humidity54%
Visibility—
Dew point25°
Tue, 2057° / 36°0
57 °
Perth, Tuesday, 20 October
Partly cloudy. High 57°, low 36°.
Pressure30.18 inHg
Wind9 mph SW
Humidity49%
Visibility—
Dew point31°
Wed, 2159° / 45°0
59 °
Perth, Wednesday, 21 October
Partly cloudy. High 59°, low 45°.
Pressure29.88 inHg
Wind24.5 mph NW
Humidity42%
Visibility—
Dew point33°
Thu, 2252° / 44°0
52 °
Perth, Thursday, 22 October
Clear. High 52°, low 44°.
Pressure30.27 inHg
Wind22.5 mph NW
Humidity43%
Visibility—
Dew point29°
From day 17 onward the outlook is built from 60-year climate statistics
Fri, 2347° / 33°0.05
47 °
Perth, Friday, 23 October
Climate normal for this date — 60-year average.
Average high47°
Average low33°
Average precipitation0.05 in
Chance of precipitation25%
Record high75° (1963)
Record low16° (2020)
Sat, 2447° / 32°0.03
47 °
Perth, Saturday, 24 October
Climate normal for this date — 60-year average.
Average high47°
Average low32°
Average precipitation0.03 in
Chance of precipitation12%
Record high74° (1989)
Record low13° (2020)
Sun, 2548° / 33°0.03
48 °
Perth, Sunday, 25 October
Climate normal for this date — 60-year average.
Average high48°
Average low33°
Average precipitation0.03 in
Chance of precipitation15%
Record high71° (1989)
Record low8° (1997)
Mon, 2648° / 33°0.05
48 °
Perth, Monday, 26 October
Climate normal for this date — 60-year average.
Average high48°
Average low33°
Average precipitation0.05 in
Chance of precipitation23%
Record high72° (1990)
Record low10° (1997)
Tue, 2746° / 31°0.08
46 °
Perth, Tuesday, 27 October
Climate normal for this date — 60-year average.
Average high46°
Average low31°
Average precipitation0.08 in
Chance of precipitation28%
Record high64° (1983)
Record low9° (2001)
Wed, 2845° / 30°0.04
45 °
Perth, Wednesday, 28 October
Climate normal for this date — 60-year average.
Average high45°
Average low30°
Average precipitation0.04 in
Chance of precipitation18%
Record high62° (1985)
Record low13° (2023)
Thu, 2944° / 30°0.04
44 °
Perth, Thursday, 29 October
Climate normal for this date — 60-year average.
Average high44°
Average low30°
Average precipitation0.04 in
Chance of precipitation20%
Record high62° (1962)
Record low8° (2023)
Fri, 3043° / 30°0.03
43 °
Perth, Friday, 30 October
Climate normal for this date — 60-year average.
Average high43°
Average low30°
Average precipitation0.03 in
Chance of precipitation20%
Record high60° (1977)
Record low-2° (1991)
Sat, 3143° / 29°0.03
43 °
Perth, Saturday, 31 October
Climate normal for this date — 60-year average.
Average high43°
Average low29°
Average precipitation0.03 in
Chance of precipitation20%
Record high67° (1999)
Record low5° (1991)
Sun, 0142° / 29°0.06
42 °
Perth, Sunday, 1 November
Climate normal for this date — 60-year average.
Average high42°
Average low29°
Average precipitation0.06 in
Chance of precipitation27%
Record high63° (1983)
Record low3° (1984)
Mon, 0242° / 28°0.04
42 °
Perth, Monday, 2 November
Climate normal for this date — 60-year average.
Average high42°
Average low28°
Average precipitation0.04 in
Chance of precipitation20%
Record high68° (1965)
Record low4° (1984)
Tue, 0340° / 27°0.04
40 °
Perth, Tuesday, 3 November
Climate normal for this date — 60-year average.
Average high40°
Average low27°
Average precipitation0.04 in
Chance of precipitation18%
Record high61° (2008)
Record low-6° (1991)
Wed, 0440° / 26°0.04
40 °
Perth, Wednesday, 4 November
Climate normal for this date — 60-year average.
Average high40°
Average low26°
Average precipitation0.04 in
Chance of precipitation17%
Record high63° (2020)
Record low-12° (1991)
Thu, 0540° / 26°0.02
40 °
Perth, Thursday, 5 November
Climate normal for this date — 60-year average.
Average high40°
Average low26°
Average precipitation0.02 in
Chance of precipitation12%
Record high65° (1975)
Record low5° (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 Perth, ND 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 Perth, ND 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.