Monthly outlook for Riverside, WA: average high 56.9°, average low 40.6°. That is 2° above the climate normal for October. Precipitation is expected on 2 days (about 0.3 inches), against a normal of 4 days and 0.8 inches. The warmest day looks like 16 October (63.4°), the coolest 12 October (33.6°).
56.9°/40.6°
Average high / low
+2°
Above normal
2 / 4
Wet days / normal
0.3 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
10 October – 19 October
57.1°
54.9°
+1.2°
20 October – 29 October
56.7°
48.8°
+4.4°
30 October – 8 November
at normal
42.8°
—
October records over 66 years
83.1°1 October 1992All-time high
2.8°30 October 1972All-time low
Climate normals and records are computed from the nearest reference point — Synarep (8 mi).
Sun, 1159° / 39°0
59 °
Riverside, Sunday, 11 October
Clear. High 59°, low 39°.
Pressure30.00 inHg
Wind10.6 mph N
Humidity46%
Visibility6.2 mi
Dew point31°
Mon, 1253° / 34°0
53 °
Riverside, Monday, 12 October
Clear. High 53°, low 34°.
Pressure30.06 inHg
Wind1.1 mph NW
Humidity47%
Visibility6.2 mi
Dew point31°
Tue, 1353° / 36°0
53 °
Riverside, Tuesday, 13 October
Clear. High 53°, low 36°.
Pressure30.18 inHg
Wind2.9 mph S
Humidity55%
Visibility6.2 mi
Dew point34°
Wed, 1453° / 39°0
53 °
Riverside, Wednesday, 14 October
Clear. High 53°, low 39°.
Pressure30.24 inHg
Wind2.9 mph S
Humidity60%
Visibility—
Dew point33°
Thu, 1560° / 43°0
60 °
Riverside, Thursday, 15 October
Mostly clear. High 60°, low 43°.
Pressure30.42 inHg
Wind7.4 mph S
Humidity59%
Visibility—
Dew point39°
Fri, 1663° / 41°0
63 °
Riverside, Friday, 16 October
Overcast. High 63°, low 41°.
Pressure30.45 inHg
Wind7.4 mph S
Humidity27%
Visibility—
Dew point20°
Sat, 1760° / 44°0
60 °
Riverside, Saturday, 17 October
Overcast. High 60°, low 44°.
Pressure30.06 inHg
Wind6.2 mph N
Humidity38%
Visibility—
Dew point29°
Sun, 1861° / 45°0
61 °
Riverside, Sunday, 18 October
Overcast. High 61°, low 45°.
Pressure30.03 inHg
Wind9.1 mph S
Humidity51%
Visibility—
Dew point36°
Mon, 1954° / 40°0.04
54 °
Riverside, Monday, 19 October
Light rain. High 54°, low 40°.
Pressure30.00 inHg
Wind9 mph N
Humidity58%
Visibility—
Dew point34°
Tue, 2053° / 36°0.06
53 °
Riverside, Tuesday, 20 October
Light rain. High 53°, low 36°.
Pressure30.21 inHg
Wind12.8 mph S
Humidity59%
Visibility—
Dew point33°
Wed, 2159° / 40°0
59 °
Riverside, Wednesday, 21 October
Clear. High 59°, low 40°.
Pressure30.12 inHg
Wind7.9 mph S
Humidity47%
Visibility—
Dew point31°
Thu, 2255° / 42°0
55 °
Riverside, Thursday, 22 October
Overcast. High 55°, low 42°.
Pressure30.06 inHg
Wind3.8 mph N
Humidity43%
Visibility—
Dew point29°
Fri, 2356° / 45°0
56 °
Riverside, Friday, 23 October
Overcast. High 56°, low 45°.
Pressure29.85 inHg
Wind11.1 mph S
Humidity45%
Visibility—
Dew point29°
Sat, 2458° / 40°0
58 °
Riverside, Saturday, 24 October
Partly cloudy. High 58°, low 40°.
Pressure30.21 inHg
Wind3.2 mph N
Humidity57%
Visibility—
Dew point36°
Sun, 2559° / 44°0
59 °
Riverside, Sunday, 25 October
Overcast. High 59°, low 44°.
Pressure30.36 inHg
Wind4.8 mph N
Humidity54%
Visibility—
Dew point37°
From day 17 onward the outlook is built from 60-year climate statistics
Mon, 2647° / 32°0.07
47 °
Riverside, Monday, 26 October
Climate normal for this date — 60-year average.
Average high47°
Average low32°
Average precipitation0.07 in
Chance of precipitation33%
Record high64° (1965)
Record low14° (1970)
Tue, 2747° / 32°0.06
47 °
Riverside, Tuesday, 27 October
Climate normal for this date — 60-year average.
Average high47°
Average low32°
Average precipitation0.06 in
Chance of precipitation22%
Record high60° (1965)
Record low17° (1970)
Wed, 2846° / 32°0.08
46 °
Riverside, Wednesday, 28 October
Climate normal for this date — 60-year average.
Average high46°
Average low32°
Average precipitation0.08 in
Chance of precipitation33%
Record high57° (2017)
Record low16° (1991)
Thu, 2945° / 31°0.06
45 °
Riverside, Thursday, 29 October
Climate normal for this date — 60-year average.
Average high45°
Average low31°
Average precipitation0.06 in
Chance of precipitation32%
Record high62° (1987)
Record low16° (2019)
Fri, 3044° / 31°0.05
44 °
Riverside, Friday, 30 October
Climate normal for this date — 60-year average.
Average high44°
Average low31°
Average precipitation0.05 in
Chance of precipitation30%
Record high58° (1962)
Record low3° (1972)
Sat, 3145° / 31°0.08
45 °
Riverside, Saturday, 31 October
Climate normal for this date — 60-year average.
Average high45°
Average low31°
Average precipitation0.08 in
Chance of precipitation33%
Record high55° (1967)
Record low6° (1984)
Sun, 0144° / 30°0.08
44 °
Riverside, Sunday, 1 November
Climate normal for this date — 60-year average.
Average high44°
Average low30°
Average precipitation0.08 in
Chance of precipitation30%
Record high55° (1987)
Record low15° (1984)
Mon, 0244° / 30°0.07
44 °
Riverside, Monday, 2 November
Climate normal for this date — 60-year average.
Average high44°
Average low30°
Average precipitation0.07 in
Chance of precipitation30%
Record high56° (2018)
Record low8° (1994)
Tue, 0343° / 30°0.06
43 °
Riverside, Tuesday, 3 November
Climate normal for this date — 60-year average.
Average high43°
Average low30°
Average precipitation0.06 in
Chance of precipitation33%
Record high55° (1975)
Record low-2° (1994)
Wed, 0443° / 31°0.09
43 °
Riverside, Wednesday, 4 November
Climate normal for this date — 60-year average.
Average high43°
Average low31°
Average precipitation0.09 in
Chance of precipitation37%
Record high56° (1975)
Record low13° (1961)
Thu, 0542° / 29°0.07
42 °
Riverside, Thursday, 5 November
Climate normal for this date — 60-year average.
Average high42°
Average low29°
Average precipitation0.07 in
Chance of precipitation40%
Record high55° (1987)
Record low1° (1994)
Fri, 0642° / 29°0.1
42 °
Riverside, Friday, 6 November
Climate normal for this date — 60-year average.
Average high42°
Average low29°
Average precipitation0.1 in
Chance of precipitation45%
Record high54° (1987)
Record low10° (2017)
Sat, 0741° / 29°0.1
41 °
Riverside, Saturday, 7 November
Climate normal for this date — 60-year average.
Average high41°
Average low29°
Average precipitation0.1 in
Chance of precipitation38%
Record high53° (1965)
Record low8° (2017)
Sun, 0841° / 28°0.07
41 °
Riverside, Sunday, 8 November
Climate normal for this date — 60-year average.
Average high41°
Average low28°
Average precipitation0.07 in
Chance of precipitation28%
Record high55° (2016)
Record low12° (1984)
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 Riverside, 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 Riverside, 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.