Monthly outlook for Simi Valley, CA: average high 73.5°, average low 55.6°. That is 0.9° below the climate normal for October. Precipitation is expected on 1 day (about 0.7 inches), against a normal of 1 days and 0.5 inches. The warmest day looks like 25 October (80.5°), the coolest 27 October (52.5°).
73.5°/55.6°
Average high / low
−0.9°
Below normal
1 / 1
Wet days / normal
0.7 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
24 October – 2 November
73.9°
75.9°
-1.1°
3 November – 12 November
72.8°
72.8°
-0°
13 November – 22 November
at normal
69.8°
—
October records over 66 years
106.2°1 October 2020All-time high
35.1°29 October 1971All-time low
Sun, 2580° / 56°0
80 °
Simi Valley, Sunday, 25 October
Clear. High 80°, low 56°.
Pressure30.03 inHg
Wind3.7 mph SW
Humidity34%
Visibility6.2 mi
Dew point46°
Mon, 2678° / 53°0
78 °
Simi Valley, Monday, 26 October
Clear. High 78°, low 53°.
Pressure30.06 inHg
Wind4.8 mph SW
Humidity35%
Visibility6.2 mi
Dew point47°
Tue, 2775° / 53°0
75 °
Simi Valley, Tuesday, 27 October
Clear. High 75°, low 53°.
Pressure29.97 inHg
Wind3.8 mph S
Humidity37%
Visibility6.2 mi
Dew point46°
Wed, 2875° / 54°0
75 °
Simi Valley, Wednesday, 28 October
Overcast. High 75°, low 54°.
Pressure29.94 inHg
Wind1.8 mph S
Humidity46%
Visibility6.2 mi
Dew point50°
Thu, 2972° / 57°0
72 °
Simi Valley, Thursday, 29 October
Overcast. High 72°, low 57°.
Pressure29.94 inHg
Wind7.7 mph SW
Humidity59%
Visibility—
Dew point51°
Fri, 3063° / 56°0.02
63 °
Simi Valley, Friday, 30 October
Light rain. High 63°, low 56°.
Pressure29.91 inHg
Wind6.8 mph SE
Humidity60%
Visibility—
Dew point48°
Sat, 3168° / 53°0.01
68 °
Simi Valley, Saturday, 31 October
Light rain. High 68°, low 53°.
Pressure30.03 inHg
Wind6.5 mph E
Humidity54%
Visibility—
Dew point46°
Sun, 0179° / 56°0
79 °
Simi Valley, Sunday, 1 November
Partly cloudy. High 79°, low 56°.
Pressure30.09 inHg
Wind21.1 mph NE
Humidity24%
Visibility—
Dew point33°
Mon, 0271° / 58°0.63
71 °
Simi Valley, Monday, 2 November
Rain. High 71°, low 58°.
Pressure30.09 inHg
Wind16 mph NE
Humidity80%
Visibility—
Dew point53°
Tue, 0373° / 57°0.01
73 °
Simi Valley, Tuesday, 3 November
Light rain. High 73°, low 57°.
Pressure30.12 inHg
Wind11 mph W
Humidity57%
Visibility—
Dew point49°
Wed, 0473° / 57°0
73 °
Simi Valley, Wednesday, 4 November
Clear. High 73°, low 57°.
Pressure29.94 inHg
Wind8.9 mph W
Humidity49%
Visibility—
Dew point47°
Thu, 0567° / 56°0
67 °
Simi Valley, Thursday, 5 November
Light rain. High 67°, low 56°.
Pressure30.00 inHg
Wind9.8 mph W
Humidity69%
Visibility—
Dew point53°
Fri, 0669° / 53°0
69 °
Simi Valley, Friday, 6 November
Clear. High 69°, low 53°.
Pressure30.09 inHg
Wind9.8 mph W
Humidity61%
Visibility—
Dew point49°
Sat, 0778° / 57°0
78 °
Simi Valley, Saturday, 7 November
Clear. High 78°, low 57°.
Pressure30.03 inHg
Wind5.6 mph NE
Humidity41%
Visibility—
Dew point44°
Sun, 0877° / 60°0
77 °
Simi Valley, Sunday, 8 November
Clear. High 77°, low 60°.
Pressure30.00 inHg
Wind7.6 mph W
Humidity36%
Visibility—
Dew point43°
From day 17 onward the outlook is built from 60-year climate statistics
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)
Sun, 1571° / 49°0.06
71 °
Simi Valley, Sunday, 15 November
Climate normal for this date — 60-year average.
Average high71°
Average low49°
Average precipitation0.06 in
Chance of precipitation12%
Record high85° (2008)
Record low34° (2000)
Mon, 1670° / 49°0.06
70 °
Simi Valley, Monday, 16 November
Climate normal for this date — 60-year average.
Average high70°
Average low49°
Average precipitation0.06 in
Chance of precipitation15%
Record high87° (2008)
Record low33° (1964)
Tue, 1769° / 49°0.05
69 °
Simi Valley, Tuesday, 17 November
Climate normal for this date — 60-year average.
Average high69°
Average low49°
Average precipitation0.05 in
Chance of precipitation12%
Record high87° (2008)
Record low38° (1994)
Wed, 1870° / 48°0.04
70 °
Simi Valley, Wednesday, 18 November
Climate normal for this date — 60-year average.
Average high70°
Average low48°
Average precipitation0.04 in
Chance of precipitation13%
Record high87° (2019)
Record low34° (1964)
Thu, 1970° / 48°0.04
70 °
Simi Valley, Thursday, 19 November
Climate normal for this date — 60-year average.
Average high70°
Average low48°
Average precipitation0.04 in
Chance of precipitation8%
Record high85° (2006)
Record low32° (1964)
Fri, 2069° / 48°0.07
69 °
Simi Valley, Friday, 20 November
Climate normal for this date — 60-year average.
Average high69°
Average low48°
Average precipitation0.07 in
Chance of precipitation13%
Record high85° (2015)
Record low34° (1964)
Sat, 2168° / 48°0.09
68 °
Simi Valley, Saturday, 21 November
Climate normal for this date — 60-year average.
Average high68°
Average low48°
Average precipitation0.09 in
Chance of precipitation17%
Record high85° (2017)
Record low35° (1964)
Sun, 2268° / 47°0.05
68 °
Simi Valley, Sunday, 22 November
Climate normal for this date — 60-year average.
Average high68°
Average low47°
Average precipitation0.05 in
Chance of precipitation13%
Record high87° (2017)
Record low34° (1983)
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.