Monthly outlook for Castaic, CA: average high 77.7°, average low 55.2°. That is 0.3° below the climate normal for October. Precipitation is expected on 0 days (about 0.0 inches), against a normal of 1 days and 0.3 inches. The warmest day looks like 27 October (87.1°), the coolest 21 October (44.2°).
77.7°/55.2°
Average high / low
−0.3°
Below normal
0 / 1
Wet days / normal
0.0 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
12 October – 21 October
75.5°
79.1°
-2°
22 October – 31 October
81.3°
75.5°
+3.2°
1 November – 10 November
at normal
72.6°
—
October records over 66 years
108.7°2 October 2024All-time high
32.5°30 October 1971All-time low
Climate normals and records are computed from the nearest reference point — Santa Clarita (9 mi).
Tue, 1372° / 48°0
72 °
Castaic, Tuesday, 13 October
Clear. High 72°, low 48°.
Pressure30.00 inHg
Wind11.3 mph N
Humidity24%
Visibility6.2 mi
Dew point27°
Wed, 1478° / 53°0
78 °
Castaic, Wednesday, 14 October
Clear. High 78°, low 53°.
Pressure30.09 inHg
Wind7.3 mph NE
Humidity19%
Visibility6.2 mi
Dew point26°
Thu, 1581° / 56°0
81 °
Castaic, Thursday, 15 October
Clear. High 81°, low 56°.
Pressure30.06 inHg
Wind16.6 mph NE
Humidity17%
Visibility6.2 mi
Dew point27°
Fri, 1682° / 65°0
82 °
Castaic, Friday, 16 October
Clear. High 82°, low 65°.
Pressure30.03 inHg
Wind21.7 mph NE
Humidity18%
Visibility6.2 mi
Dew point34°
Sat, 1782° / 61°0
82 °
Castaic, Saturday, 17 October
Clear. High 82°, low 61°.
Pressure30.03 inHg
Wind11.1 mph NE
Humidity25%
Visibility—
Dew point36°
Sun, 1884° / 57°0
84 °
Castaic, Sunday, 18 October
Clear. High 84°, low 57°.
Pressure29.97 inHg
Wind10.3 mph SW
Humidity22%
Visibility—
Dew point34°
Mon, 1981° / 59°0
81 °
Castaic, Monday, 19 October
Clear. High 81°, low 59°.
Pressure29.91 inHg
Wind16.6 mph SW
Humidity27%
Visibility—
Dew point38°
Tue, 2068° / 47°0.02
68 °
Castaic, Tuesday, 20 October
Light rain. High 68°, low 47°.
Pressure29.80 inHg
Wind21 mph SW
Humidity56%
Visibility—
Dew point47°
Wed, 2166° / 44°0
66 °
Castaic, Wednesday, 21 October
Clear. High 66°, low 44°.
Pressure29.91 inHg
Wind14.6 mph N
Humidity26%
Visibility—
Dew point25°
Thu, 2277° / 49°0
77 °
Castaic, Thursday, 22 October
Clear. High 77°, low 49°.
Pressure30.12 inHg
Wind9.5 mph NE
Humidity16%
Visibility—
Dew point19°
Fri, 2378° / 52°0
78 °
Castaic, Friday, 23 October
Clear. High 78°, low 52°.
Pressure30.06 inHg
Wind18.4 mph NE
Humidity14%
Visibility—
Dew point19°
Sat, 2480° / 59°0
80 °
Castaic, Saturday, 24 October
Clear. High 80°, low 59°.
Pressure30.18 inHg
Wind24.7 mph NE
Humidity13%
Visibility—
Dew point20°
Sun, 2581° / 57°0
81 °
Castaic, Sunday, 25 October
Clear. High 81°, low 57°.
Pressure30.09 inHg
Wind22.5 mph NE
Humidity10%
Visibility—
Dew point13°
Mon, 2685° / 60°0
85 °
Castaic, Monday, 26 October
Clear. High 85°, low 60°.
Pressure30.12 inHg
Wind20.4 mph NE
Humidity9%
Visibility—
Dew point14°
Tue, 2787° / 64°0
87 °
Castaic, Tuesday, 27 October
Clear. High 87°, low 64°.
Pressure30.06 inHg
Wind15.9 mph NE
Humidity10%
Visibility—
Dew point19°
From day 17 onward the outlook is built from 60-year climate statistics
Wed, 2875° / 52°0.02
75 °
Castaic, Wednesday, 28 October
Climate normal for this date — 60-year average.
Average high75°
Average low52°
Average precipitation0.02 in
Chance of precipitation8%
Record high92° (2017)
Record low42° (1991)
Thu, 2973° / 51°0.01
73 °
Castaic, Thursday, 29 October
Climate normal for this date — 60-year average.
Average high73°
Average low51°
Average precipitation0.01 in
Chance of precipitation7%
Record high89° (1965)
Record low33° (1971)
Fri, 3073° / 51°0.05
73 °
Castaic, Friday, 30 October
Climate normal for this date — 60-year average.
Average high73°
Average low51°
Average precipitation0.05 in
Chance of precipitation18%
Record high89° (2025)
Record low33° (1971)
Sat, 3173° / 50°0.02
73 °
Castaic, Saturday, 31 October
Climate normal for this date — 60-year average.
Average high73°
Average low50°
Average precipitation0.02 in
Chance of precipitation8%
Record high88° (1966)
Record low37° (1972)
Sun, 0174° / 51°0.03
74 °
Castaic, Sunday, 1 November
Climate normal for this date — 60-year average.
Average high74°
Average low51°
Average precipitation0.03 in
Chance of precipitation10%
Record high88° (1967)
Record low40° (1971)
Mon, 0274° / 50°0.01
74 °
Castaic, Monday, 2 November
Climate normal for this date — 60-year average.
Average high74°
Average low50°
Average precipitation0.01 in
Chance of precipitation8%
Record high89° (2018)
Record low41° (2003)
Tue, 0375° / 50°0
75 °
Castaic, Tuesday, 3 November
Climate normal for this date — 60-year average.
Average high75°
Average low50°
Average precipitation0 in
Chance of precipitation5%
Record high88° (2010)
Record low36° (1994)
Wed, 0475° / 50°0.02
75 °
Castaic, Wednesday, 4 November
Climate normal for this date — 60-year average.
Average high75°
Average low50°
Average precipitation0.02 in
Chance of precipitation5%
Record high89° (1980)
Record low36° (1994)
Thu, 0574° / 49°0.01
74 °
Castaic, Thursday, 5 November
Climate normal for this date — 60-year average.
Average high74°
Average low49°
Average precipitation0.01 in
Chance of precipitation3%
Record high88° (2012)
Record low37° (2011)
Fri, 0673° / 50°0.02
73 °
Castaic, Friday, 6 November
Climate normal for this date — 60-year average.
Average high73°
Average low50°
Average precipitation0.02 in
Chance of precipitation8%
Record high88° (1991)
Record low40° (2011)
Sat, 0771° / 49°0.06
71 °
Castaic, Saturday, 7 November
Climate normal for this date — 60-year average.
Average high71°
Average low49°
Average precipitation0.06 in
Chance of precipitation12%
Record high89° (2006)
Record low34° (2011)
Sun, 0871° / 49°0.06
71 °
Castaic, Sunday, 8 November
Climate normal for this date — 60-year average.
Average high71°
Average low49°
Average precipitation0.06 in
Chance of precipitation20%
Record high86° (2014)
Record low37° (2011)
Mon, 0970° / 48°0.04
70 °
Castaic, Monday, 9 November
Climate normal for this date — 60-year average.
Average high70°
Average low48°
Average precipitation0.04 in
Chance of precipitation18%
Record high86° (2016)
Record low34° (2020)
Tue, 1070° / 47°0.03
70 °
Castaic, Tuesday, 10 November
Climate normal for this date — 60-year average.
Average high70°
Average low47°
Average precipitation0.03 in
Chance of precipitation15%
Record high87° (2025)
Record low38° (1998)
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 Castaic, 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 Castaic, 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.