Monthly outlook for Mason, WA: average high 58.9°, average low 41.9°. That is 0.2° above the climate normal for October. Precipitation is expected on 0 days (about 0.1 inches), against a normal of 3 days and 0.7 inches. The warmest day looks like 15 October (66.3°), the coolest 13 October (33.9°).
58.9°/41.9°
Average high / low
+0.2°
Above normal
0 / 3
Wet days / normal
0.1 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
10 October – 19 October
58.8°
59.7°
-0.5°
20 October – 29 October
59°
54.9°
+2.3°
30 October – 8 November
at normal
49.3°
—
October records over 66 years
87.1°2 October 1975All-time high
16.7°31 October 1984All-time low
Climate normals and records are computed from the nearest reference point — Sprague (9 mi).
Sun, 1150° / 37°0.02
50 °
Mason, Sunday, 11 October
Light rain. High 50°, low 37°.
Pressure29.94 inHg
Wind16.7 mph NE
Humidity47%
Visibility6.2 mi
Dew point25°
Mon, 1254° / 37°0
54 °
Mason, Monday, 12 October
Clear. High 54°, low 37°.
Pressure30.06 inHg
Wind3.9 mph E
Humidity45%
Visibility6.2 mi
Dew point27°
Tue, 1357° / 34°0
57 °
Mason, Tuesday, 13 October
Mostly clear. High 57°, low 34°.
Pressure30.15 inHg
Wind2.7 mph SW
Humidity44%
Visibility6.2 mi
Dew point31°
Wed, 1461° / 36°0
61 °
Mason, Wednesday, 14 October
Mostly clear. High 61°, low 36°.
Pressure30.21 inHg
Wind2.2 mph SW
Humidity37%
Visibility6.2 mi
Dew point29°
Thu, 1566° / 40°0
66 °
Mason, Thursday, 15 October
Clear. High 66°, low 40°.
Pressure30.39 inHg
Wind6.7 mph NE
Humidity35%
Visibility—
Dew point29°
Fri, 1666° / 44°0
66 °
Mason, Friday, 16 October
Partly cloudy. High 66°, low 44°.
Pressure30.39 inHg
Wind12.8 mph NE
Humidity39%
Visibility—
Dew point31°
Sat, 1764° / 48°0
64 °
Mason, Saturday, 17 October
Overcast. High 64°, low 48°.
Pressure30.06 inHg
Wind9.8 mph SW
Humidity34%
Visibility—
Dew point30°
Sun, 1861° / 46°0
61 °
Mason, Sunday, 18 October
Overcast. High 61°, low 46°.
Pressure30.03 inHg
Wind16.6 mph SW
Humidity52%
Visibility—
Dew point37°
Mon, 1955° / 44°0.04
55 °
Mason, Monday, 19 October
Light rain. High 55°, low 44°.
Pressure29.97 inHg
Wind11.2 mph SW
Humidity56%
Visibility—
Dew point37°
Tue, 2055° / 38°0
55 °
Mason, Tuesday, 20 October
Mostly clear. High 55°, low 38°.
Pressure30.24 inHg
Wind10.3 mph S
Humidity61%
Visibility—
Dew point35°
Wed, 2156° / 42°0
56 °
Mason, Wednesday, 21 October
Partly cloudy. High 56°, low 42°.
Pressure30.15 inHg
Wind16.9 mph SW
Humidity36%
Visibility—
Dew point25°
Thu, 2258° / 43°0
58 °
Mason, Thursday, 22 October
Overcast. High 58°, low 43°.
Pressure30.03 inHg
Wind9.2 mph NE
Humidity33%
Visibility—
Dew point23°
Fri, 2358° / 49°0.01
58 °
Mason, Friday, 23 October
Light rain. High 58°, low 49°.
Pressure29.85 inHg
Wind9.5 mph S
Humidity41%
Visibility—
Dew point31°
Sat, 2463° / 47°0
63 °
Mason, Saturday, 24 October
Overcast. High 63°, low 47°.
Pressure30.15 inHg
Wind7.4 mph SW
Humidity47%
Visibility—
Dew point36°
Sun, 2564° / 47°0
64 °
Mason, Sunday, 25 October
Overcast. High 64°, low 47°.
Pressure30.30 inHg
Wind9.3 mph NE
Humidity54%
Visibility—
Dew point40°
From day 17 onward the outlook is built from 60-year climate statistics
Mon, 2653° / 39°0.05
53 °
Mason, Monday, 26 October
Climate normal for this date — 60-year average.
Average high53°
Average low39°
Average precipitation0.05 in
Chance of precipitation28%
Record high69° (1965)
Record low21° (2020)
Tue, 2753° / 38°0.06
53 °
Mason, Tuesday, 27 October
Climate normal for this date — 60-year average.
Average high53°
Average low38°
Average precipitation0.06 in
Chance of precipitation30%
Record high69° (1965)
Record low23° (2020)
Wed, 2852° / 38°0.05
52 °
Mason, Wednesday, 28 October
Climate normal for this date — 60-year average.
Average high52°
Average low38°
Average precipitation0.05 in
Chance of precipitation30%
Record high68° (2003)
Record low21° (1991)
Thu, 2951° / 37°0.06
51 °
Mason, Thursday, 29 October
Climate normal for this date — 60-year average.
Average high51°
Average low37°
Average precipitation0.06 in
Chance of precipitation30%
Record high67° (1983)
Record low19° (2019)
Fri, 3051° / 37°0.06
51 °
Mason, Friday, 30 October
Climate normal for this date — 60-year average.
Average high51°
Average low37°
Average precipitation0.06 in
Chance of precipitation27%
Record high63° (2015)
Record low18° (2019)
Sat, 3150° / 37°0.07
50 °
Mason, Saturday, 31 October
Climate normal for this date — 60-year average.
Average high50°
Average low37°
Average precipitation0.07 in
Chance of precipitation28%
Record high66° (1988)
Record low17° (1984)
Sun, 0150° / 36°0.08
50 °
Mason, Sunday, 1 November
Climate normal for this date — 60-year average.
Average high50°
Average low36°
Average precipitation0.08 in
Chance of precipitation35%
Record high68° (1965)
Record low20° (2002)
Mon, 0250° / 36°0.07
50 °
Mason, Monday, 2 November
Climate normal for this date — 60-year average.
Average high50°
Average low36°
Average precipitation0.07 in
Chance of precipitation32%
Record high64° (1981)
Record low21° (2002)
Tue, 0350° / 37°0.04
50 °
Mason, Tuesday, 3 November
Climate normal for this date — 60-year average.
Average high50°
Average low37°
Average precipitation0.04 in
Chance of precipitation23%
Record high63° (1975)
Record low24° (2002)
Wed, 0450° / 37°0.1
50 °
Mason, Wednesday, 4 November
Climate normal for this date — 60-year average.
Average high50°
Average low37°
Average precipitation0.1 in
Chance of precipitation42%
Record high65° (1975)
Record low23° (2003)
Thu, 0548° / 35°0.07
48 °
Mason, Thursday, 5 November
Climate normal for this date — 60-year average.
Average high48°
Average low35°
Average precipitation0.07 in
Chance of precipitation37%
Record high62° (1987)
Record low17° (2003)
Fri, 0648° / 35°0.07
48 °
Mason, Friday, 6 November
Climate normal for this date — 60-year average.
Average high48°
Average low35°
Average precipitation0.07 in
Chance of precipitation35%
Record high61° (1999)
Record low17° (2003)
Sat, 0748° / 36°0.11
48 °
Mason, Saturday, 7 November
Climate normal for this date — 60-year average.
Average high48°
Average low36°
Average precipitation0.11 in
Chance of precipitation35%
Record high64° (1999)
Record low22° (1973)
Sun, 0847° / 35°0.06
47 °
Mason, Sunday, 8 November
Climate normal for this date — 60-year average.
Average high47°
Average low35°
Average precipitation0.06 in
Chance of precipitation30%
Record high64° (2016)
Record low24° (2022)
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 Mason, 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 Mason, 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.