Monthly outlook for Markham, WA: average high 60.4°, average low 48.2°. That is 0.5° above the climate normal for October. Precipitation is expected on 4 days (about 1.1 inches), against a normal of 7 days and 3.4 inches. The warmest day looks like 8 October (67.2°), the coolest 15 October (42.2°).
60.4°/48.2°
Average high / low
+0.5°
Above normal
4 / 7
Wet days / normal
1.1 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
7 October – 16 October
59.9°
60.2°
-0.2°
17 October – 26 October
61.2°
57.3°
+2.2°
27 October – 5 November
at normal
54.1°
—
October records over 66 years
81.7°6 October 1987All-time high
30.7°28 October 1971All-time low
Thu, 0867° / 52°0
67 °
Markham, Thursday, 8 October
Overcast. High 67°, low 52°.
Pressure30.06 inHg
Wind6.8 mph NW
Humidity86%
Visibility6.2 mi
Dew point54°
Fri, 0959° / 54°0.17
59 °
Markham, Friday, 9 October
Rain. High 59°, low 54°.
Pressure29.88 inHg
Wind20.3 mph NW
Humidity68%
Visibility6.2 mi
Dew point46°
Sat, 1058° / 49°0
58 °
Markham, Saturday, 10 October
Mostly clear. High 58°, low 49°.
Pressure29.85 inHg
Wind5.7 mph E
Humidity69%
Visibility6.2 mi
Dew point45°
Sun, 1159° / 45°0
59 °
Markham, Sunday, 11 October
Clear. High 59°, low 45°.
Pressure30.03 inHg
Wind4.1 mph NE
Humidity63%
Visibility6.2 mi
Dew point44°
Mon, 1257° / 42°0
57 °
Markham, Monday, 12 October
Clear. High 57°, low 42°.
Pressure30.09 inHg
Wind6.2 mph NW
Humidity58%
Visibility—
Dew point40°
Tue, 1357° / 48°0.71
57 °
Markham, Tuesday, 13 October
Rain. High 57°, low 48°.
Pressure29.88 inHg
Wind17.1 mph NW
Humidity69%
Visibility—
Dew point46°
Wed, 1457° / 46°0.04
57 °
Markham, Wednesday, 14 October
Light rain. High 57°, low 46°.
Pressure30.12 inHg
Wind15.7 mph NW
Humidity61%
Visibility—
Dew point43°
Thu, 1559° / 42°0
59 °
Markham, Thursday, 15 October
Clear. High 59°, low 42°.
Pressure30.39 inHg
Wind7.7 mph NW
Humidity50%
Visibility—
Dew point38°
Fri, 1662° / 43°0
62 °
Markham, Friday, 16 October
Clear. High 62°, low 43°.
Pressure30.30 inHg
Wind11.3 mph E
Humidity47%
Visibility—
Dew point39°
Sat, 1761° / 44°0
61 °
Markham, Saturday, 17 October
Clear. High 61°, low 44°.
Pressure30.00 inHg
Wind7.4 mph E
Humidity45%
Visibility—
Dew point38°
Sun, 1855° / 46°0
55 °
Markham, Sunday, 18 October
Overcast. High 55°, low 46°.
Pressure30.03 inHg
Wind10.5 mph S
Humidity79%
Visibility—
Dew point48°
Mon, 1957° / 51°0.14
57 °
Markham, Monday, 19 October
Light rain. High 57°, low 51°.
Pressure30.18 inHg
Wind8.1 mph SE
Humidity73%
Visibility—
Dew point47°
Tue, 2064° / 53°0
64 °
Markham, Tuesday, 20 October
Overcast. High 64°, low 53°.
Pressure30.36 inHg
Wind5.7 mph E
Humidity67%
Visibility—
Dew point51°
Wed, 2165° / 52°0
65 °
Markham, Wednesday, 21 October
Clear. High 65°, low 52°.
Pressure30.39 inHg
Wind6.7 mph NW
Humidity64%
Visibility—
Dew point51°
Thu, 2265° / 51°0
65 °
Markham, Thursday, 22 October
Overcast. High 65°, low 51°.
Pressure30.30 inHg
Wind11.2 mph NE
Humidity57%
Visibility—
Dew point48°
From day 17 onward the outlook is built from 60-year climate statistics
Fri, 2357° / 47°0.19
57 °
Markham, Friday, 23 October
Climate normal for this date — 60-year average.
Average high57°
Average low47°
Average precipitation0.19 in
Chance of precipitation45%
Record high70° (2007)
Record low38° (2024)
Sat, 2456° / 46°0.28
56 °
Markham, Saturday, 24 October
Climate normal for this date — 60-year average.
Average high56°
Average low46°
Average precipitation0.28 in
Chance of precipitation47%
Record high72° (1965)
Record low38° (1971)
Sun, 2555° / 46°0.32
55 °
Markham, Sunday, 25 October
Climate normal for this date — 60-year average.
Average high55°
Average low46°
Average precipitation0.32 in
Chance of precipitation60%
Record high68° (1965)
Record low36° (1970)
Mon, 2655° / 46°0.32
55 °
Markham, Monday, 26 October
Climate normal for this date — 60-year average.
Average high55°
Average low46°
Average precipitation0.32 in
Chance of precipitation53%
Record high69° (1965)
Record low34° (1970)
Tue, 2755° / 45°0.29
55 °
Markham, Tuesday, 27 October
Climate normal for this date — 60-year average.
Average high55°
Average low45°
Average precipitation0.29 in
Chance of precipitation48%
Record high67° (2017)
Record low34° (1971)
Wed, 2854° / 45°0.36
54 °
Markham, Wednesday, 28 October
Climate normal for this date — 60-year average.
Average high54°
Average low45°
Average precipitation0.36 in
Chance of precipitation65%
Record high69° (1962)
Record low31° (1971)
Thu, 2954° / 44°0.23
54 °
Markham, Thursday, 29 October
Climate normal for this date — 60-year average.
Average high54°
Average low44°
Average precipitation0.23 in
Chance of precipitation52%
Record high65° (1962)
Record low33° (1971)
Fri, 3054° / 45°0.3
54 °
Markham, Friday, 30 October
Climate normal for this date — 60-year average.
Average high54°
Average low45°
Average precipitation0.3 in
Chance of precipitation60%
Record high61° (2017)
Record low33° (1991)
Sat, 3154° / 44°0.31
54 °
Markham, Saturday, 31 October
Climate normal for this date — 60-year average.
Average high54°
Average low44°
Average precipitation0.31 in
Chance of precipitation53%
Record high64° (1966)
Record low33° (2019)
Sun, 0155° / 45°0.3
55 °
Markham, Sunday, 1 November
Climate normal for this date — 60-year average.
Average high55°
Average low45°
Average precipitation0.3 in
Chance of precipitation48%
Record high66° (1969)
Record low33° (2003)
Mon, 0254° / 44°0.31
54 °
Markham, Monday, 2 November
Climate normal for this date — 60-year average.
Average high54°
Average low44°
Average precipitation0.31 in
Chance of precipitation60%
Record high65° (1962)
Record low34° (1973)
Tue, 0354° / 45°0.33
54 °
Markham, Tuesday, 3 November
Climate normal for this date — 60-year average.
Average high54°
Average low45°
Average precipitation0.33 in
Chance of precipitation62%
Record high65° (2010)
Record low31° (2003)
Wed, 0454° / 45°0.41
54 °
Markham, Wednesday, 4 November
Climate normal for this date — 60-year average.
Average high54°
Average low45°
Average precipitation0.41 in
Chance of precipitation65%
Record high63° (1980)
Record low33° (1973)
Thu, 0553° / 44°0.31
53 °
Markham, Thursday, 5 November
Climate normal for this date — 60-year average.
Average high53°
Average low44°
Average precipitation0.31 in
Chance of precipitation70%
Record high64° (1987)
Record low30° (1973)
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 Markham, WA 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 Markham, WA 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.