United States · 1991–2020

Best time to visit
Highlands.

August leads for comfortable weather in Highlands: typically 18.8°C by day, 12.1°C at night, with 6 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortAugust

Typical high18.8°C

Typical low12.1°C

Rain in August6 mm

Comfort

August

August · September · July

78climate match

Beach

August

August · July · September

45climate match

Outdoors

September

September · October · June

96climate match

The weakest month is January, scoring 35 against August’s 78 — days reach only 15.5°C, 8° below the 24°C the score treats as ideal.

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

3515.5° / 6.3°

Feb

3715.6° / 6.1°

Mar

4215.9° / 6.6°

Apr

5616.2° / 7.1°

May

6416.7° / 9°

Jun

7017.7° / 10°

Jul

7518.3° / 11.6°

Aug

7818.8° / 12.1°

Sep

7619.2° / 10.6°

Oct

7219.1° / 8.8°

Nov

5517.1° / 6.9°

Dec

3615.3° / 5.9°

Monthly climate evidence for Highlands — daylight is calculated from latitude, everything else is measured, sea temperature from the nearest open water 16 km away
Month	Day	Night	Rain	Wet days	Sea	Daylight	Comfort	Coverage
January	15.5°C	6.3°C	134 mm	10.6	12.2°C	9 h 50	35	Strong coverage
February	15.6°C	6.1°C	128 mm	10.4	12.3°C	10 h 45	37	Strong coverage
March	15.9°C	6.6°C	99 mm	10.6	12.3°C	11 h 50	42	Strong coverage
April	16.2°C	7.1°C	45 mm	5.9	12.0°C	13 h 07	56	Strong coverage
May	16.7°C	9°C	24 mm	3.9	12.2°C	14 h 10	64	Strong coverage
June	17.7°C	10°C	9 mm	2	12.9°C	14 h 44	70	Strong coverage
July	18.3°C	11.6°C	4 mm	1	14.1°C	14 h 31	75	Strong coverage
August	18.8°C	12.1°C	6 mm	1.7	14.9°C	13 h 36	78	Strong coverage
September	19.2°C	10.6°C	6 mm	1.3	14.9°C	12 h 23	76	Strong coverage
October	19.1°C	8.8°C	35 mm	3.3	14.2°C	11 h 09	72	Strong coverage
November	17.1°C	6.9°C	62 mm	6.7	13.4°C	10 h 06	55	Strong coverage
December	15.3°C	5.9°C	130 mm	10	12.5°C	9 h 35	36	Strong coverage

What has changed

Highlands runs +0.3°C
on the 1961–1990 baseline.

Each bar compares the 2011–2025 daytime average for that month against the same month in 1961–1990, measured at the same station. Months where the older record is too thin to compare are left blank.

Jan

+0.9

Feb

+0.2

Mar

+0.2

Apr

+0.1

May

+0.5

Jun

+0.5

Jul

+0.2

Aug

+0.2

Sep

-0.3

Oct

+0.5

Nov

+0.1

Dec

+0.6

August daytime highs, 2011–2025. Last recorded: 18.2°C.

Records at HALF MOON BAY, 1939–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	24.4°C23 Jan 1948	-2.8°C11 Jan 1949	135 mm4 Jan 1982	308 mm1998 · driest 0 mm in 2015	85
February	26.1°C27 Feb 2026	-5.6°C3 Feb 2003	74 mm3 Feb 1998	399 mm1998 · driest 0 mm in 2020	85
March	28.3°C31 Mar 2000	-2.2°C29 Mar 2007	98 mm30 Mar 1940	331 mm1983 · driest 0 mm in 1956	83
April	28.9°C1 Apr 2000	-0.6°C20 Apr 2008	60 mm4 Apr 1941	189 mm1967 · driest 0 mm in 1949	85
May	27.8°C4 May 2011	0.6°C1 May 2008	33 mm27 May 1990	104 mm1957 · driest 0 mm in 1982	85
June	31.7°C10 Jun 2019	2.2°C7 Jun 2007	28 mm2 Jun 1967	54 mm2011 · driest 0 mm in 1956	85
July	27.2°C2 Jul 1970	4.4°C23 Jul 2008	15 mm8 Jul 1974	26 mm1974 · driest 0 mm in 1940	85
August	31.1°C30 Aug 1968	5.0°C27 Aug 1981	18 mm20 Aug 1997	40 mm1976 · driest 0 mm in 1972	85
September	33.3°C25 Sep 2019	1.7°C30 Sep 2007	65 mm19 Sep 1959	93 mm1959 · driest 0 mm in 1944	87
October	34.4°C27 Oct 2003	0.6°C29 Oct 1946	125 mm13 Oct 1962	279 mm1962 · driest 0 mm in 1966	87
November	30.6°C1 Nov 1966	-1.1°C22 Nov 2003	72 mm18 Nov 1982	250 mm1984 · driest 0 mm in 1959	84
December	26.1°C4 Dec 1958	-7.2°C23 Dec 1990	140 mm16 Dec 2002	322 mm1955 · driest 1 mm in 1989	85

Typical days per month at HALF MOON BAY, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)
January	0	0	1	4
February	<1	0	1	4
March	<1	0	<1	3
April	<1	0	<1	1
May	<1	0	0	<1
June	<1	<1	0	<1
July	<1	0	0	0
August	<1	0	0	0
September	<1	<1	0	<1
October	3	<1	0	1
November	1	0	<1	2
December	0	0	1	4

The best month has moved. On the 1961–1990 numbers the strongest month here was September (scoring 78); on 2011–2025 it is August (79). Both are scored the same way, from the same station — only the climate underneath changed.

How often, not how much — every day in HALF MOON BAY’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	6%	31%	13%	39%	13.2–16.3°C
February	7%	32%	13%	41%	13.4–17.0°C
March	8%	30%	11%	36%	13.7–17.2°C
April	8%	19%	5%	17%	14.3–17.2°C
May	5%	11%	2%	8%	15.2–18.0°C
June	11%	5%	<1%	2%	15.8–18.6°C
July	14%	3%	0%	<1%	16.5–19.0°C
August	24%	5%	<1%	2%	17.2–19.8°C
September	34%	5%	<1%	2%	17.7–21.1°C
October	27%	11%	4%	10%	17.7–20.2°C
November	16%	23%	8%	29%	15.5–18.7°C
December	5%	30%	13%	37%	13.4–16.7°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.

1940Each stripe is one year’s mean temperature against the 76-year average. Warmest: 2014. Coolest: 1955.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 5356950
NOAA station: USC00043714 · HALF MOON BAY
Station distance: 10.2 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 27 usable years
Daylight: Calculated from latitude 37.52°, mid-month, sunrise to sunset including refraction. Not a station measurement.
Sea temperature: NOAA OISST v2.1 1991–2020 monthly climatology, nearest open water 16 km from the place centre. A sheltered bay can run warmer than the open sea it is measured from.
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 HALF MOON BAY is what differs

Half Moon Bay→El Granada→Highlands-Baywood Park→El Granada Mobile Home Park→Miramar→Princeton→

Or put two places side by side: Highlands vs Half Moon Bay

Best time to visitHighlands.

August

August

September

The whole year,without the guesswork.

Highlands runs +0.3°Con the 1961–1990 baseline.

Nearby, measured,and named.

Best time to visit
Highlands.

The whole year,
without the guesswork.

Highlands runs +0.3°C
on the 1961–1990 baseline.

Nearby, measured,
and named.