Monthly outlook for Heather, WA: average high 58.8°, average low 49.7°. That is 0° below the climate normal for October. Precipitation is expected on 5 days (about 0.3 inches), against a normal of 7 days and 3.5 inches. The warmest day looks like 9 October (63.1°), the coolest 11 October (43.9°).
58.8°/49.7°
Average high / low
−0°
Below normal
5 / 7
Wet days / normal
0.3 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
9 October – 18 October
58.9°
59.7°
-0.4°
19 October – 28 October
58.4°
56.5°
+1.1°
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° / 45°0.04
60 °
Heather, Saturday, 10 October
Light rain. High 60°, low 45°.
Pressure29.85 inHg
Wind1.9 mph NE
Humidity66%
Visibility6.2 mi
Dew point45°
Sun, 1159° / 44°0
59 °
Heather, Sunday, 11 October
Clear. High 59°, low 44°.
Pressure29.97 inHg
Wind5.5 mph N
Humidity63%
Visibility6.2 mi
Dew point44°
Mon, 1255° / 48°0
55 °
Heather, Monday, 12 October
Partly cloudy. High 55°, low 48°.
Pressure30.06 inHg
Wind3.2 mph NW
Humidity74%
Visibility5.9 mi
Dew point45°
Tue, 1357° / 52°0.06
57 °
Heather, Tuesday, 13 October
Light rain. High 57°, low 52°.
Pressure30.12 inHg
Wind16.9 mph S
Humidity83%
Visibility—
Dew point51°
Wed, 1458° / 53°0.02
58 °
Heather, Wednesday, 14 October
Light rain. High 58°, low 53°.
Pressure30.33 inHg
Wind11.5 mph NW
Humidity80%
Visibility—
Dew point51°
Thu, 1563° / 52°0
63 °
Heather, Thursday, 15 October
Overcast. High 63°, low 52°.
Pressure30.27 inHg
Wind14 mph E
Humidity64%
Visibility—
Dew point48°
Fri, 1658° / 53°0
58 °
Heather, Friday, 16 October
Overcast. High 58°, low 53°.
Pressure30.30 inHg
Wind6.6 mph SE
Humidity71%
Visibility—
Dew point48°
Sat, 1759° / 54°0
59 °
Heather, Saturday, 17 October
Overcast. High 59°, low 54°.
Pressure30.24 inHg
Wind8.8 mph NW
Humidity86%
Visibility—
Dew point55°
Sun, 1858° / 52°0
58 °
Heather, Sunday, 18 October
Mostly clear. High 58°, low 52°.
Pressure30.15 inHg
Wind6.6 mph W
Humidity69%
Visibility—
Dew point47°
Mon, 1957° / 53°0.07
57 °
Heather, Monday, 19 October
Light rain. High 57°, low 53°.
Pressure30.06 inHg
Wind17 mph NW
Humidity71%
Visibility—
Dew point47°
Tue, 2055° / 48°0.04
55 °
Heather, Tuesday, 20 October
Light rain. High 55°, low 48°.
Pressure30.24 inHg
Wind11.1 mph NW
Humidity69%
Visibility—
Dew point44°
Wed, 2158° / 46°0
58 °
Heather, Wednesday, 21 October
Clear. High 58°, low 46°.
Pressure30.24 inHg
Wind9.5 mph NE
Humidity59%
Visibility—
Dew point43°
Thu, 2262° / 48°0
62 °
Heather, Thursday, 22 October
Clear. High 62°, low 48°.
Pressure29.91 inHg
Wind13.8 mph E
Humidity44%
Visibility—
Dew point38°
Fri, 2358° / 50°0
58 °
Heather, Friday, 23 October
Mostly clear. High 58°, low 50°.
Pressure29.94 inHg
Wind11.7 mph E
Humidity60%
Visibility—
Dew point43°
Sat, 2460° / 49°0
60 °
Heather, Saturday, 24 October
Overcast. High 60°, low 49°.
Pressure29.94 inHg
Wind10.1 mph N
Humidity56%
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.