Monthly outlook for Heather, WA: average high 59.4°, average low 50.8°. That is 0.3° above the climate normal for October. Precipitation is expected on 4 days (about 0.4 inches), against a normal of 7 days and 3.5 inches. The warmest day looks like 23 October (65.5°), the coolest 11 October (46.3°).
59.4°/50.8°
Average high / low
+0.3°
Above normal
4 / 7
Wet days / normal
0.4 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
9 October – 18 October
58.8°
59.7°
-0.5°
19 October – 28 October
60.4°
56.5°
+2.2°
29 October – 7 November
at normal
53.6°
—
October records over 66 years
81.7°6 October 1987All-time high
30.7°28 October 1971All-time low
Climate normals and records are computed from the nearest reference point — Markham (11 mi).
Sat, 1060° / 47°0.03
60 °
Heather, Saturday, 10 October
Light rain. High 60°, low 47°.
Pressure29.83 inHg
Wind0.5 mph SE
Humidity66%
Visibility6.2 mi
Dew point44°
Sun, 1158° / 46°0
58 °
Heather, Sunday, 11 October
Clear. High 58°, low 46°.
Pressure30.00 inHg
Wind5.6 mph N
Humidity62%
Visibility6.2 mi
Dew point44°
Mon, 1256° / 47°0
56 °
Heather, Monday, 12 October
Clear. High 56°, low 47°.
Pressure30.06 inHg
Wind2.6 mph W
Humidity72%
Visibility2.9 mi
Dew point46°
Tue, 1357° / 49°0.03
57 °
Heather, Tuesday, 13 October
Light rain. High 57°, low 49°.
Pressure30.15 inHg
Wind2.9 mph SW
Humidity82%
Visibility3.1 mi
Dew point51°
Wed, 1458° / 56°0.07
58 °
Heather, Wednesday, 14 October
Light rain. High 58°, low 56°.
Pressure30.30 inHg
Wind8.9 mph S
Humidity97%
Visibility—
Dew point57°
Thu, 1564° / 52°0
64 °
Heather, Thursday, 15 October
Overcast. High 64°, low 52°.
Pressure30.21 inHg
Wind11.8 mph NE
Humidity62%
Visibility—
Dew point49°
Fri, 1660° / 53°0
60 °
Heather, Friday, 16 October
Partly cloudy. High 60°, low 53°.
Pressure30.30 inHg
Wind10.1 mph E
Humidity75%
Visibility—
Dew point51°
Sat, 1759° / 51°0
59 °
Heather, Saturday, 17 October
Overcast. High 59°, low 51°.
Pressure30.15 inHg
Wind10.5 mph NW
Humidity71%
Visibility—
Dew point49°
Sun, 1855° / 48°0.07
55 °
Heather, Sunday, 18 October
Light rain. High 55°, low 48°.
Pressure30.06 inHg
Wind6.8 mph S
Humidity68%
Visibility—
Dew point44°
Mon, 1956° / 51°0.02
56 °
Heather, Monday, 19 October
Light rain. High 56°, low 51°.
Pressure30.18 inHg
Wind9.8 mph W
Humidity80%
Visibility—
Dew point49°
Tue, 2056° / 53°0.01
56 °
Heather, Tuesday, 20 October
Light rain. High 56°, low 53°.
Pressure30.27 inHg
Wind7 mph SW
Humidity80%
Visibility—
Dew point50°
Wed, 2159° / 53°0.06
59 °
Heather, Wednesday, 21 October
Light rain. High 59°, low 53°.
Pressure30.24 inHg
Wind14.7 mph S
Humidity74%
Visibility—
Dew point49°
Thu, 2264° / 50°0
64 °
Heather, Thursday, 22 October
Overcast. High 64°, low 50°.
Pressure30.06 inHg
Wind15.1 mph NE
Humidity54%
Visibility—
Dew point45°
Fri, 2366° / 50°0
66 °
Heather, Friday, 23 October
Clear. High 66°, low 50°.
Pressure29.88 inHg
Wind12.2 mph E
Humidity48%
Visibility—
Dew point43°
Sat, 2462° / 53°0
62 °
Heather, Saturday, 24 October
Overcast. High 62°, low 53°.
Pressure29.91 inHg
Wind7.6 mph E
Humidity52%
Visibility—
Dew point43°
From day 17 onward the outlook is built from 60-year climate statistics
Sun, 2555° / 46°0.32
55 °
Heather, 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 °
Heather, 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 °
Heather, 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 °
Heather, 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 °
Heather, 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 °
Heather, 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 °
Heather, 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 °
Heather, 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 °
Heather, 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 °
Heather, 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 °
Heather, 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 °
Heather, 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)
Fri, 0653° / 44°0.4
53 °
Heather, Friday, 6 November
Climate normal for this date — 60-year average.
Average high53°
Average low44°
Average precipitation0.4 in
Chance of precipitation70%
Record high61° (1976)
Record low34° (2017)
Sat, 0753° / 45°0.34
53 °
Heather, Saturday, 7 November
Climate normal for this date — 60-year average.
Average high53°
Average low45°
Average precipitation0.34 in
Chance of precipitation70%
Record high61° (2024)
Record low35° (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 Heather, 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 Heather, 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.