Monthly outlook for Grotto, WA: average high 53.9°, average low 40.2°. That is 1.9° below the climate normal for October. Precipitation is expected on 7 days (about 2.4 inches), against a normal of 9 days and 4.6 inches. The warmest day looks like 16 October (70.9°), the coolest 18 October (29.7°).
53.9°/40.2°
Average high / low
−1.9°
Below normal
7 / 9
Wet days / normal
2.4 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
13 October – 22 October
56.9°
59°
-1.2°
23 October – 1 November
48.9°
53.6°
-2.6°
2 November – 11 November
at normal
50°
—
October records over 66 years
88.2°1 October 1987All-time high
2.1°28 October 1971All-time low
Climate normals and records are computed from the nearest reference point — Skykomish (3 mi).
Wed, 1468° / 51°0.02
68 °
Grotto, Wednesday, 14 October
Light rain. High 68°, low 51°.
Pressure30.33 inHg
Wind1.6 mph NW
Humidity82%
Visibility6.2 mi
Dew point47°
Thu, 1567° / 37°0
67 °
Grotto, Thursday, 15 October
Overcast. High 67°, low 37°.
Pressure30.39 inHg
Wind5.7 mph E
Humidity49%
Visibility6.2 mi
Dew point43°
Fri, 1671° / 41°0
71 °
Grotto, Friday, 16 October
Overcast. High 71°, low 41°.
Pressure30.18 inHg
Wind4 mph E
Humidity41%
Visibility6.2 mi
Dew point41°
Sat, 1751° / 36°0.18
51 °
Grotto, Saturday, 17 October
Light rain. High 51°, low 36°.
Pressure30.18 inHg
Wind5.1 mph NW
Humidity85%
Visibility6.2 mi
Dew point43°
Sun, 1853° / 30°0
53 °
Grotto, Sunday, 18 October
Clear. High 53°, low 30°.
Pressure30.15 inHg
Wind4.7 mph NW
Humidity64%
Visibility—
Dew point33°
Mon, 1953° / 38°0.01
53 °
Grotto, Monday, 19 October
Light rain. High 53°, low 38°.
Pressure29.91 inHg
Wind4.4 mph W
Humidity60%
Visibility—
Dew point35°
Tue, 2051° / 48°0.09
51 °
Grotto, Tuesday, 20 October
Light rain. High 51°, low 48°.
Pressure29.94 inHg
Wind3.2 mph W
Humidity91%
Visibility—
Dew point47°
Wed, 2148° / 46°0.09
48 °
Grotto, Wednesday, 21 October
Light rain. High 48°, low 46°.
Pressure30.00 inHg
Wind4.2 mph W
Humidity94%
Visibility—
Dew point46°
Thu, 2247° / 45°0.74
47 °
Grotto, Thursday, 22 October
Rain. High 47°, low 45°.
Pressure29.94 inHg
Wind4.8 mph NW
Humidity94%
Visibility—
Dew point45°
Fri, 2345° / 41°0.59
45 °
Grotto, Friday, 23 October
Rain. High 45°, low 41°.
Pressure30.03 inHg
Wind3 mph W
Humidity99%
Visibility—
Dew point43°
Sat, 2444° / 42°0.3
44 °
Grotto, Saturday, 24 October
Light rain. High 44°, low 42°.
Pressure30.18 inHg
Wind2.6 mph W
Humidity100%
Visibility—
Dew point43°
Sun, 2543° / 39°0.39
43 °
Grotto, Sunday, 25 October
Rain. High 43°, low 39°.
Pressure30.30 inHg
Wind3.2 mph E
Humidity100%
Visibility—
Dew point42°
Mon, 2652° / 32°0
52 °
Grotto, Monday, 26 October
Clear. High 52°, low 32°.
Pressure30.33 inHg
Wind5.4 mph E
Humidity74%
Visibility—
Dew point37°
Tue, 2756° / 35°0
56 °
Grotto, Tuesday, 27 October
Overcast. High 56°, low 35°.
Pressure30.24 inHg
Wind6.1 mph E
Humidity71%
Visibility—
Dew point38°
Wed, 2853° / 41°0
53 °
Grotto, Wednesday, 28 October
Overcast. High 53°, low 41°.
Pressure30.27 inHg
Wind6.2 mph E
Humidity79%
Visibility—
Dew point42°
From day 17 onward the outlook is built from 60-year climate statistics
Thu, 2953° / 39°0.27
53 °
Grotto, Thursday, 29 October
Climate normal for this date — 60-year average.
Average high53°
Average low39°
Average precipitation0.27 in
Chance of precipitation62%
Record high72° (1962)
Record low10° (1971)
Fri, 3052° / 39°0.37
52 °
Grotto, Friday, 30 October
Climate normal for this date — 60-year average.
Average high52°
Average low39°
Average precipitation0.37 in
Chance of precipitation57%
Record high64° (1962)
Record low10° (1972)
Sat, 3152° / 40°0.42
52 °
Grotto, Saturday, 31 October
Climate normal for this date — 60-year average.
Average high52°
Average low40°
Average precipitation0.42 in
Chance of precipitation68%
Record high67° (1962)
Record low24° (1995)
Sun, 0152° / 39°0.39
52 °
Grotto, Sunday, 1 November
Climate normal for this date — 60-year average.
Average high52°
Average low39°
Average precipitation0.39 in
Chance of precipitation60%
Record high69° (1962)
Record low26° (1995)
Mon, 0252° / 39°0.31
52 °
Grotto, Monday, 2 November
Climate normal for this date — 60-year average.
Average high52°
Average low39°
Average precipitation0.31 in
Chance of precipitation58%
Record high72° (2020)
Record low15° (1973)
Tue, 0351° / 39°0.35
51 °
Grotto, Tuesday, 3 November
Climate normal for this date — 60-year average.
Average high51°
Average low39°
Average precipitation0.35 in
Chance of precipitation60%
Record high68° (1962)
Record low12° (1973)
Wed, 0452° / 40°0.52
52 °
Grotto, Wednesday, 4 November
Climate normal for this date — 60-year average.
Average high52°
Average low40°
Average precipitation0.52 in
Chance of precipitation63%
Record high67° (1976)
Record low24° (1968)
Thu, 0551° / 39°0.33
51 °
Grotto, Thursday, 5 November
Climate normal for this date — 60-year average.
Average high51°
Average low39°
Average precipitation0.33 in
Chance of precipitation65%
Record high64° (1980)
Record low11° (1971)
Fri, 0649° / 39°0.44
49 °
Grotto, Friday, 6 November
Climate normal for this date — 60-year average.
Average high49°
Average low39°
Average precipitation0.44 in
Chance of precipitation65%
Record high65° (2012)
Record low24° (1971)
Sat, 0749° / 39°0.44
49 °
Grotto, Saturday, 7 November
Climate normal for this date — 60-year average.
Average high49°
Average low39°
Average precipitation0.44 in
Chance of precipitation70%
Record high62° (2019)
Record low17° (2017)
Sun, 0850° / 38°0.32
50 °
Grotto, Sunday, 8 November
Climate normal for this date — 60-year average.
Average high50°
Average low38°
Average precipitation0.32 in
Chance of precipitation58%
Record high67° (2016)
Record low22° (2022)
Mon, 0949° / 38°0.34
49 °
Grotto, Monday, 9 November
Climate normal for this date — 60-year average.
Average high49°
Average low38°
Average precipitation0.34 in
Chance of precipitation72%
Record high65° (2025)
Record low14° (1982)
Tue, 1048° / 37°0.31
48 °
Grotto, Tuesday, 10 November
Climate normal for this date — 60-year average.
Average high48°
Average low37°
Average precipitation0.31 in
Chance of precipitation58%
Record high64° (2016)
Record low13° (1986)
Wed, 1149° / 37°0.38
49 °
Grotto, Wednesday, 11 November
Climate normal for this date — 60-year average.
Average high49°
Average low37°
Average precipitation0.38 in
Chance of precipitation65%
Record high64° (2016)
Record low7° (1985)
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 Grotto, 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 Grotto, 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.