United States · 1991–2020

Best time to visit
Emerald Lake Hills.

October leads for comfortable weather in Emerald Lake Hills: typically 23.9°C by day, 10.1°C at night, with 25 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortOctober

Typical high23.9°C

Typical low10.1°C

Rain in October25 mm

Comfort

October

October · May · June

91climate match

Beach

July

July · August · September

75climate match

Outdoors

April

April · May · October

95climate match

The weakest month is December, scoring 39 against October’s 91 — days reach only 14.9°C, 9° below the 24°C the score treats as ideal, and nights drop to 4.7°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

4015.2° / 4.9°

Feb

4716.7° / 5.9°

Mar

5918.8° / 7.3°

Apr

7620.6° / 8.2°

May

8822.9° / 10.3°

Jun

8826.1° / 12.1°

Jul

8727.4° / 13.8°

Aug

8727.3° / 13.7°

Sep

8726.5° / 12.6°

Oct

9123.9° / 10.1°

Nov

6418.3° / 6.8°

Dec

3914.9° / 4.7°

Monthly climate evidence for Emerald Lake Hills — daylight is calculated from latitude, everything else is measured, sea temperature from the nearest open water 14 km away
Month	Day	Night	Rain	Wet days	Sea	Daylight	Comfort	Coverage
January	15.2°C	4.9°C	93 mm	7.7	12.2°C	9 h 50	40	Strong coverage
February	16.7°C	5.9°C	91 mm	8.2	12.3°C	10 h 45	47	Strong coverage
March	18.8°C	7.3°C	74 mm	7.9	12.3°C	11 h 51	59	Strong coverage
April	20.6°C	8.2°C	27 mm	3.5	12.0°C	13 h 06	76	Strong coverage
May	22.9°C	10.3°C	12 mm	2.1	12.2°C	14 h 10	88	Strong coverage
June	26.1°C	12.1°C	3 mm	0.7	12.9°C	14 h 44	88	Strong coverage
July	27.4°C	13.8°C	0 mm	0	14.1°C	14 h 30	87	Strong coverage
August	27.3°C	13.7°C	1 mm	0.1	14.9°C	13 h 36	87	Strong coverage
September	26.5°C	12.6°C	2 mm	0.3	14.9°C	12 h 23	87	Strong coverage
October	23.9°C	10.1°C	25 mm	2	14.2°C	11 h 10	91	Strong coverage
November	18.3°C	6.8°C	42 mm	4.5	13.4°C	10 h 06	64	Strong coverage
December	14.9°C	4.7°C	95 mm	7.2	12.5°C	9 h 35	39	Strong coverage

What has changed

Emerald Lake Hills 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

+1.3

Feb

+0.2

Mar

-0.2

Apr

-0.6

May

-1.4

Jun

-0.9

Jul

-1.6

Aug

-1.1

Sep

-0.9

Oct

+0.4

Nov

+0.3

Dec

+0.9

October daytime highs, 2011–2025. Last recorded: 23.6°C.

Records at REDWOOD CITY, 1930–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	25.6°C15 Jan 2009	-8.9°C11 Jan 1949	122 mm21 Jan 1967	312 mm1940 · driest 0 mm in 2015	93
February	26.7°C14 Feb 1977	-3.9°C6 Feb 1989	76 mm13 Feb 1987	316 mm1998 · driest 0 mm in 2020	94
March	34.4°C20 Mar 2026	-1.7°C2 Mar 1953	83 mm30 Mar 1940	234 mm1983 · driest 0 mm in 1934	93
April	35.6°C29 Apr 1981	-0.6°C3 Apr 1931	65 mm2 Apr 1958	162 mm1958 · driest 0 mm in 2008	95
May	38.9°C29 May 1950	2.2°C8 May 1933	34 mm18 May 1957	70 mm1957 · driest 0 mm in 1943	95
June	42.8°C15 Jun 1961	2.8°C6 Jun 1945	15 mm16 Jun 1995	26 mm2011 · driest 0 mm in 1994	96
July	43.3°C14 Jul 1972	4.4°C3 Jul 1979	8 mm30 Jul 1966	8 mm1966 · driest 0 mm in 2004	95
August	40.6°C7 Aug 1983	5.6°C30 Aug 1939	21 mm20 Aug 1997	23 mm1976 · driest 0 mm in 1989	92
September	43.3°C6 Sep 2022	3.3°C26 Sep 1980	78 mm18 Sep 1959	78 mm1959 · driest 0 mm in 1968	93
October	40.0°C2 Oct 1980	0.6°C31 Oct 1935	124 mm13 Oct 1962	163 mm1962 · driest 0 mm in 2022	94
November	31.1°C8 Nov 1995	-5.0°C23 Nov 1931	80 mm19 Nov 1946	187 mm1973 · driest 0 mm in 1959	94
December	24.4°C12 Dec 1958	-7.8°C12 Dec 1932	114 mm31 Dec 2022	360 mm1955 · driest 0 mm in 1989	95

Typical days per month at REDWOOD CITY, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)
January	<1	0	2	3
February	<1	0	<1	3
March	2	<1	0	2
April	5	<1	0	1
May	9	3	0	<1
June	17	7	0	<1
July	25	7	0	0
August	23	7	0	0
September	17	7	0	0
October	11	3	0	<1
November	1	0	<1	1
December	0	0	3	3

How often, not how much — every day in REDWOOD CITY’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%	29%	12%	35%	13.1–16.6°C
February	16%	29%	11%	34%	14.9–18.7°C
March	33%	25%	8%	27%	16.6–20.7°C
April	56%	14%	3%	12%	18.7–23.4°C
May	76%	7%	<1%	4%	21.1–25.6°C
June	93%	2%	<1%	<1%	24.5–28.3°C
July	99%	<1%	0%	<1%	26.1–29.2°C
August	99%	<1%	<1%	<1%	26.2–29.0°C
September	97%	2%	<1%	<1%	25.3–28.9°C
October	82%	7%	3%	6%	22.2–25.9°C
November	32%	18%	6%	19%	17.1–20.5°C
December	5%	26%	11%	29%	13.2–16.5°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.

1931Each stripe is one year’s mean temperature against the 86-year average. Warmest: 2014. Coolest: 1933.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 5346413
NOAA station: USC00047339 · REDWOOD CITY
Station distance: 2.9 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 27 usable years
Daylight: Calculated from latitude 37.46°, mid-month, sunrise to sunset including refraction. Not a station measurement.
Sea temperature: NOAA OISST v2.1 1991–2020 monthly climatology, nearest open water 14 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 REDWOOD CITY is what differs

Redwood City→Foster City→San Carlos→Belmont→North Fair Oaks→Redwood Shores→

Or put two places side by side: Emerald Lake Hills vs Redwood City

Best time to visitEmerald Lake Hills.