Monthly outlook for Simi Valley, CA: average high 75.7°, average low 59.2°. That is 1° below the climate normal for October. Precipitation is expected on 2 days (about 0.9 inches), against a normal of 1 days and 0.4 inches. The warmest day looks like 16 October (92.1°), the coolest 30 October (53.1°).
75.7°/59.2°
Average high / low
−1°
Below normal
2 / 1
Wet days / normal
0.9 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
16 October – 25 October
78.3°
78.5°
-0.1°
26 October – 4 November
71.3°
75.6°
-2.4°
5 November – 14 November
at normal
72°
—
October records over 66 years
106.2°1 October 2020All-time high
35.1°29 October 1971All-time low
Sat, 1791° / 74°0
91 °
Simi Valley, Saturday, 17 October
Overcast. High 91°, low 74°.
Pressure30.03 inHg
Wind13.4 mph NE
Humidity14%
Visibility6.2 mi
Dew point32°
Sun, 1889° / 62°0
89 °
Simi Valley, Sunday, 18 October
Clear. High 89°, low 62°.
Pressure29.94 inHg
Wind5.6 mph NE
Humidity14%
Visibility6.2 mi
Dew point32°
Mon, 1984° / 61°0
84 °
Simi Valley, Monday, 19 October
Clear. High 84°, low 61°.
Pressure29.88 inHg
Wind4.1 mph S
Humidity20%
Visibility6.2 mi
Dew point38°
Tue, 2072° / 58°0
72 °
Simi Valley, Tuesday, 20 October
Light rain. High 72°, low 58°.
Pressure29.88 inHg
Wind7.9 mph S
Humidity47%
Visibility—
Dew point46°
Wed, 2167° / 57°0.61
67 °
Simi Valley, Wednesday, 21 October
Rain. High 67°, low 57°.
Pressure29.94 inHg
Wind6.7 mph SE
Humidity83%
Visibility—
Dew point56°
Thu, 2269° / 58°0.21
69 °
Simi Valley, Thursday, 22 October
Light rain. High 69°, low 58°.
Pressure29.94 inHg
Wind11.7 mph W
Humidity55%
Visibility—
Dew point48°
Fri, 2371° / 57°0.02
71 °
Simi Valley, Friday, 23 October
Light rain. High 71°, low 57°.
Pressure30.00 inHg
Wind9.3 mph SW
Humidity60%
Visibility—
Dew point50°
Sat, 2472° / 56°0.02
72 °
Simi Valley, Saturday, 24 October
Light rain. High 72°, low 56°.
Pressure30.00 inHg
Wind12.5 mph W
Humidity46%
Visibility—
Dew point42°
Sun, 2576° / 57°0
76 °
Simi Valley, Sunday, 25 October
Clear. High 76°, low 57°.
Pressure30.00 inHg
Wind10.8 mph W
Humidity34%
Visibility—
Dew point38°
Mon, 2673° / 60°0
73 °
Simi Valley, Monday, 26 October
Overcast. High 73°, low 60°.
Pressure29.80 inHg
Wind11.8 mph SW
Humidity41%
Visibility—
Dew point44°
Tue, 2772° / 55°0
72 °
Simi Valley, Tuesday, 27 October
Clear. High 72°, low 55°.
Pressure29.80 inHg
Wind8.9 mph W
Humidity33%
Visibility—
Dew point35°
Wed, 2873° / 58°0
73 °
Simi Valley, Wednesday, 28 October
Clear. High 73°, low 58°.
Pressure29.97 inHg
Wind9.2 mph W
Humidity38%
Visibility—
Dew point40°
Thu, 2967° / 55°0.02
67 °
Simi Valley, Thursday, 29 October
Light rain. High 67°, low 55°.
Pressure29.85 inHg
Wind7.2 mph NE
Humidity62%
Visibility—
Dew point50°
Fri, 3071° / 53°0
71 °
Simi Valley, Friday, 30 October
Clear. High 71°, low 53°.
Pressure29.97 inHg
Wind12.6 mph W
Humidity41%
Visibility—
Dew point39°
Sat, 3171° / 55°0
71 °
Simi Valley, Saturday, 31 October
Clear. High 71°, low 55°.
Pressure30.06 inHg
Wind10.3 mph W
Humidity56%
Visibility—
Dew point48°
From day 17 onward the outlook is built from 60-year climate statistics
Sun, 0176° / 53°0.04
76 °
Simi Valley, Sunday, 1 November
Climate normal for this date — 60-year average.
Average high76°
Average low53°
Average precipitation0.04 in
Chance of precipitation8%
Record high91° (1997)
Record low42° (2000)
Mon, 0276° / 52°0.01
76 °
Simi Valley, Monday, 2 November
Climate normal for this date — 60-year average.
Average high76°
Average low52°
Average precipitation0.01 in
Chance of precipitation8%
Record high91° (1997)
Record low43° (2003)
Tue, 0376° / 51°0
76 °
Simi Valley, Tuesday, 3 November
Climate normal for this date — 60-year average.
Average high76°
Average low51°
Average precipitation0 in
Chance of precipitation8%
Record high91° (2018)
Record low39° (1994)
Wed, 0476° / 52°0.02
76 °
Simi Valley, Wednesday, 4 November
Climate normal for this date — 60-year average.
Average high76°
Average low52°
Average precipitation0.02 in
Chance of precipitation7%
Record high94° (2020)
Record low38° (1994)
Thu, 0574° / 51°0.01
74 °
Simi Valley, Thursday, 5 November
Climate normal for this date — 60-year average.
Average high74°
Average low51°
Average precipitation0.01 in
Chance of precipitation3%
Record high92° (2020)
Record low39° (2011)
Fri, 0673° / 52°0.03
73 °
Simi Valley, Friday, 6 November
Climate normal for this date — 60-year average.
Average high73°
Average low52°
Average precipitation0.03 in
Chance of precipitation8%
Record high89° (2006)
Record low44° (1973)
Sat, 0772° / 52°0.07
72 °
Simi Valley, Saturday, 7 November
Climate normal for this date — 60-year average.
Average high72°
Average low52°
Average precipitation0.07 in
Chance of precipitation17%
Record high91° (2006)
Record low37° (2011)
Sun, 0872° / 51°0.08
72 °
Simi Valley, Sunday, 8 November
Climate normal for this date — 60-year average.
Average high72°
Average low51°
Average precipitation0.08 in
Chance of precipitation17%
Record high89° (2025)
Record low40° (2011)
Mon, 0971° / 50°0.04
71 °
Simi Valley, Monday, 9 November
Climate normal for this date — 60-year average.
Average high71°
Average low50°
Average precipitation0.04 in
Chance of precipitation10%
Record high88° (2016)
Record low41° (2011)
Tue, 1071° / 50°0.03
71 °
Simi Valley, Tuesday, 10 November
Climate normal for this date — 60-year average.
Average high71°
Average low50°
Average precipitation0.03 in
Chance of precipitation12%
Record high90° (2025)
Record low40° (2000)
Wed, 1171° / 50°0.06
71 °
Simi Valley, Wednesday, 11 November
Climate normal for this date — 60-year average.
Average high71°
Average low50°
Average precipitation0.06 in
Chance of precipitation12%
Record high86° (2019)
Record low37° (2000)
Thu, 1272° / 50°0.04
72 °
Simi Valley, Thursday, 12 November
Climate normal for this date — 60-year average.
Average high72°
Average low50°
Average precipitation0.04 in
Chance of precipitation8%
Record high87° (2021)
Record low35° (1978)
Fri, 1372° / 49°0.03
72 °
Simi Valley, Friday, 13 November
Climate normal for this date — 60-year average.
Average high72°
Average low49°
Average precipitation0.03 in
Chance of precipitation10%
Record high89° (2021)
Record low34° (1985)
Sat, 1472° / 49°0.05
72 °
Simi Valley, Saturday, 14 November
Climate normal for this date — 60-year average.
Average high72°
Average low49°
Average precipitation0.05 in
Chance of precipitation10%
Record high91° (2021)
Record low36° (2000)
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 Simi Valley, CA 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 Simi Valley, CA 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.