United States · 1991–2020

Best time to visit
Castaic.

October leads for comfortable weather in Castaic: typically 26°C by day, 13°C at night, with 18 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortOctober

Typical high26°C

Typical low13°C

Rain in October18 mm

Comfort

October

October · May · April

90climate match

Beach

June

June · September · July

78climate match

Outdoors

November

November · March · April

98climate match

The weakest month is February, scoring 47 against October’s 90 — days reach only 17.1°C, 7° below the 24°C the score treats as ideal, and nights drop to 6.6°C.

Month by month

The whole year,
without the guesswork.

The bars show the comfort score. Day and night temperatures come from daily observed highs and lows; rain is the historical monthly estimate.

Jan

5516.9° / 7.5°

Feb

4717.1° / 6.6°

Mar

7420.4° / 8.1°

Apr

8322.4° / 8.7°

May

8626.7° / 12°

Jun

7929.6° / 13.9°

Jul

6334.1° / 17.1°

Aug

6134.6° / 17.4°

Sep

7032.2° / 16.5°

Oct

9026° / 13°

Nov

7920.6° / 9.7°

Dec

5516.2° / 7°

Monthly climate evidence for Castaic — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	16.9°C	7.5°C	85 mm	4.1	10 h 05	55	Good coverage
February	17.1°C	6.6°C	122 mm	5.7	10 h 53	47	Good coverage
March	20.4°C	8.1°C	50 mm	3.2	11 h 52	74	Good coverage
April	22.4°C	8.7°C	25 mm	1.9	13 h 00	83	Good coverage
May	26.7°C	12°C	10 mm	0.8	13 h 57	86	Good coverage
June	29.6°C	13.9°C	0 mm	0.1	14 h 27	79	Good coverage
July	34.1°C	17.1°C	0 mm	0	14 h 15	63	Good coverage
August	34.6°C	17.4°C	0 mm	0.1	13 h 27	61	Good coverage
September	32.2°C	16.5°C	3 mm	0.4	12 h 21	70	Good coverage
October	26°C	13°C	18 mm	1.6	11 h 15	90	Good coverage
November	20.6°C	9.7°C	23 mm	2.2	10 h 19	79	Good coverage
December	16.2°C	7°C	64 mm	3.6	9 h 51	55	Good coverage

Records at NEWHALL 5NW, 1997–2014
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	28.3°C5 Jan 2012	-3.3°C14 Jan 2007	102 mm10 Jan 2005	364 mm2005 · driest 0 mm in 2014	17
February	33.3°C14 Feb 2014	0.6°C28 Feb 2012	195 mm12 Feb 2003	373 mm1998 · driest 5 mm in 2012	17
March	35.6°C12 Mar 2007	-1.1°C12 Mar 2006	168 mm20 Mar 2011	189 mm2011 · driest 0 mm in 2007	17
April	37.8°C28 Apr 2007	0.0°C9 Apr 1999	48 mm5 Apr 2010	74 mm2006 · driest 0 mm in 2014	17
May	40.6°C12 May 2013	5.0°C16 May 2011	31 mm12 May 1998	93 mm1998 · driest 0 mm in 2009	17
June	43.3°C30 Jun 2013	5.0°C4 Jun 1999	1 mm2 Jun 1999	2 mm1999 · driest 0 mm in 2004	17
July	46.7°C22 Jul 2006	9.4°C8 Jul 2000	1 mm29 Jul 2003	1 mm2003 · driest 0 mm in 2005	18
August	46.7°C5 Aug 1997	9.4°C28 Aug 2010	2 mm29 Aug 2000	2 mm2000 · driest 0 mm in 2013	17
September	43.3°C2 Sep 2007	8.3°C21 Sep 2007	18 mm22 Sep 2007	30 mm2007 · driest 0 mm in 2009	17
October	41.7°C1 Oct 2012	5.6°C10 Oct 2013	50 mm19 Oct 2004	97 mm2004 · driest 0 mm in 1997	17
November	36.1°C7 Nov 2006	1.1°C19 Nov 2011	38 mm8 Nov 2002	78 mm1997 · driest 0 mm in 2006	17
December	30.6°C21 Dec 2005	-1.1°C21 Dec 1998	120 mm20 Dec 2010	349 mm2010 · driest 0 mm in 2000	17

Typical days per month at NEWHALL 5NW, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)
January	1	0	<1	2
February	2	<1	0	3
March	8	<1	<1	1
April	11	4	<1	1
May	19	10	0	<1
June	25	16	0	0
July	31	27	0	0
August	31	28	0	0
September	27	21	0	<1
October	18	9	0	<1
November	6	1	0	<1
December	1	<1	<1	2

How often, not how much — every day in NEWHALL 5NW’s record sorted by what it was actually like, rather than averaged
Month	Warm & dry days	Wet days	Washouts	Week with 3+ wet days	Daytime mean has ranged
January	29%	13%	7%	14%	14.4–20.2°C
February	29%	20%	11%	24%	14.1–19.8°C
March	53%	10%	4%	7%	17.2–24.3°C
April	65%	7%	4%	4%	18.6–25.7°C
May	88%	3%	<1%	0%	24.3–29.9°C
June	96%	<1%	0%	0%	26.6–33.0°C
July	100%	0%	0%	0%	32.0–36.0°C
August	100%	<1%	0%	0%	32.8–35.9°C
September	97%	1%	<1%	0%	29.2–35.2°C
October	84%	5%	2%	3%	23.0–29.0°C
November	54%	8%	3%	3%	17.6–23.2°C
December	26%	12%	5%	12%	14.4–18.8°C

A warm and dry day reaches 20°C with under 1 mm of rain; a wet day gets 1 mm or more; a washout gets 10 mm or more. The week column is the share of seven-day stretches in that month, across the station’s whole daily record, that contained three or more wet days — the odds a week-long trip is rained on repeatedly, counted rather than modelled. The last column is the 10th to 90th percentile of that month’s daytime average across individual years: a narrow band means the average is what you will get, a wide one means the average is a midpoint between years that felt quite different.

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 5334799
NOAA station: USC00046161 · NEWHALL 5NW
Station distance: 11 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 17 usable years
Daylight: Calculated from latitude 34.49°, mid-month, sunrise to sunset including refraction. Not a station measurement.
Important limit: Historical climate is not a forecast. Nearby stations can miss mountains, coasts, and local microclimates.

These places read the same station, so their numbers are identical — distance from NEWHALL 5NW is what differs

Santa Clarita→Valencia→Canyon Country→Stevenson Ranch→Val Verde→Alpine (historical)→

Or put two places side by side: Castaic vs Santa Clarita

Best time to visitCastaic.