Monthly outlook for Simi Valley, CA: average high 76.7°, average low 59.5°. That is 0.1° below the climate normal for October. Precipitation is expected on 2 days (about 0.8 inches), against a normal of 1 days and 0.4 inches. The warmest day looks like 25 October (85.9°), the coolest 23 October (52.1°).
76.7°/59.5°
Average high / low
−0.1°
Below normal
2 / 1
Wet days / normal
0.8 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
18 October – 27 October
77.8°
78°
-0.1°
28 October – 6 November
74.7°
75°
-0.1°
7 November – 16 November
at normal
71.3°
—
October records over 66 years
106.2°1 October 2020All-time high
35.1°29 October 1971All-time low
Mon, 1985° / 66°0
85 °
Simi Valley, Monday, 19 October
Clear. High 85°, low 66°.
Pressure29.91 inHg
Wind5.1 mph S
Humidity21%
Visibility6.2 mi
Dew point40°
Tue, 2082° / 60°0
82 °
Simi Valley, Tuesday, 20 October
Clear. High 82°, low 60°.
Pressure29.88 inHg
Wind5.9 mph SE
Humidity35%
Visibility6.2 mi
Dew point49°
Wed, 2162° / 57°0.51
62 °
Simi Valley, Wednesday, 21 October
Rain. High 62°, low 57°.
Pressure29.91 inHg
Wind2.8 mph NE
Humidity93%
Visibility1.6 mi
Dew point57°
Thu, 2267° / 56°0.27
67 °
Simi Valley, Thursday, 22 October
Rain. High 67°, low 56°.
Pressure29.97 inHg
Wind9 mph W
Humidity63%
Visibility—
Dew point50°
Fri, 2372° / 52°0
72 °
Simi Valley, Friday, 23 October
Clear. High 72°, low 52°.
Pressure30.03 inHg
Wind7.2 mph NE
Humidity54%
Visibility—
Dew point48°
Sat, 2482° / 59°0
82 °
Simi Valley, Saturday, 24 October
Clear. High 82°, low 59°.
Pressure30.00 inHg
Wind27 mph NE
Humidity27%
Visibility—
Dew point39°
Sun, 2586° / 65°0
86 °
Simi Valley, Sunday, 25 October
Clear. High 86°, low 65°.
Pressure29.91 inHg
Wind20.5 mph NE
Humidity18%
Visibility—
Dew point32°
Mon, 2684° / 64°0
84 °
Simi Valley, Monday, 26 October
Overcast. High 84°, low 64°.
Pressure29.77 inHg
Wind8.4 mph SW
Humidity18%
Visibility—
Dew point31°
Tue, 2774° / 61°0
74 °
Simi Valley, Tuesday, 27 October
Overcast. High 74°, low 61°.
Pressure29.94 inHg
Wind8.8 mph SE
Humidity58%
Visibility—
Dew point53°
Wed, 2873° / 58°0
73 °
Simi Valley, Wednesday, 28 October
Overcast. High 73°, low 58°.
Pressure30.00 inHg
Wind10.8 mph W
Humidity56%
Visibility—
Dew point50°
Thu, 2974° / 56°0
74 °
Simi Valley, Thursday, 29 October
Partly cloudy. High 74°, low 56°.
Pressure30.00 inHg
Wind8.5 mph SW
Humidity50%
Visibility—
Dew point47°
Fri, 3075° / 58°0
75 °
Simi Valley, Friday, 30 October
Clear. High 75°, low 58°.
Pressure29.97 inHg
Wind10.3 mph W
Humidity32%
Visibility—
Dew point37°
Sat, 3177° / 57°0
77 °
Simi Valley, Saturday, 31 October
Partly cloudy. High 77°, low 57°.
Pressure29.97 inHg
Wind10.1 mph W
Humidity24%
Visibility—
Dew point31°
Sun, 0175° / 61°0
75 °
Simi Valley, Sunday, 1 November
Overcast. High 75°, low 61°.
Pressure30.06 inHg
Wind6.9 mph W
Humidity31%
Visibility—
Dew point38°
Mon, 0275° / 61°0
75 °
Simi Valley, Monday, 2 November
Overcast. High 75°, low 61°.
Pressure30.12 inHg
Wind5.8 mph W
Humidity48%
Visibility—
Dew point49°
From day 17 onward the outlook is built from 60-year climate statistics
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)
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)
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.