United States · 1991–2020

Best time to visit
Tamalpais Valley.

May leads for comfortable weather in Tamalpais Valley: typically 23.4°C by day, 9.8°C at night, with 35 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortMay

Typical high23.4°C

Typical low9.8°C

Rain in May35 mm

Comfort

May

May · October · June

89climate match

Beach

August

August · July · September

74climate match

Outdoors

May

May · April · October

89climate match

The weakest month is December, scoring 13 against May’s 89 — days reach only 14°C, 10° below the 24°C the score treats as ideal, and 252 mm of rain falls.

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

1814.1° / 5.5°

Feb

2816.6° / 6.3°

Mar

4618.8° / 6.9°

Apr

7120.8° / 8°

May

8923.4° / 9.8°

Jun

8426.8° / 11.2°

Jul

8028.5° / 11.9°

Aug

8028.6° / 12.1°

Sep

8028.2° / 11.6°

Oct

8724.6° / 10°

Nov

5218° / 7.5°

Dec

1314° / 5.4°

Monthly climate evidence for Tamalpais Valley — daylight is calculated from latitude, everything else is measured, sea temperature from the nearest open water 7 km away
Month	Day	Night	Rain	Wet days	Sea	Daylight	Comfort	Coverage
January	14.1°C	5.5°C	218 mm	10.3	11.6°C	9 h 48	18	Strong coverage
February	16.6°C	6.3°C	221 mm	9.8	11.9°C	10 h 44	28	Strong coverage
March	18.8°C	6.9°C	153 mm	9	12.0°C	11 h 50	46	Strong coverage
April	20.8°C	8°C	65 mm	5	11.5°C	13 h 07	71	Strong coverage
May	23.4°C	9.8°C	35 mm	3.1	11.7°C	14 h 12	89	Strong coverage
June	26.8°C	11.2°C	9 mm	0.8	12.1°C	14 h 46	84	Strong coverage
July	28.5°C	11.9°C	0 mm	0	13.4°C	14 h 33	80	Strong coverage
August	28.6°C	12.1°C	1 mm	0.1	14.2°C	13 h 37	80	Strong coverage
September	28.2°C	11.6°C	2 mm	0.4	14.4°C	12 h 23	80	Strong coverage
October	24.6°C	10°C	53 mm	2.8	13.7°C	11 h 09	87	Strong coverage
November	18°C	7.5°C	119 mm	6.4	12.9°C	10 h 04	52	Strong coverage
December	14°C	5.4°C	252 mm	10	12.0°C	9 h 33	13	Strong coverage

What has changed

Tamalpais Valley runs +0.4°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

+1.7

Feb

+0.9

Mar

0.0

Apr

+0.2

May

-0.5

Jun

-0.1

Jul

-0.8

Aug

-0.1

Sep

+0.5

Oct

+1.3

Nov

+0.6

Dec

+1.0

May daytime highs, 2011–2025. Last recorded: 24.6°C.

Records at KENTFIELD, 1902–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	26.1°C9 Jan 1962	-7.8°C9 Jan 1937	294 mm21 Jan 1967	798 mm1909 · driest 0 mm in 2015	124
February	28.9°C14 Feb 1930	-6.1°C1 Feb 1917	220 mm12 Feb 1904	720 mm1902 · driest 0 mm in 2020	125
March	32.8°C28 Mar 1923	-3.9°C2 Mar 1917	123 mm23 Mar 1928	577 mm1983 · driest 1 mm in 1923	124
April	36.1°C28 Apr 1921	-1.7°C6 Apr 1929	126 mm7 Apr 1935	233 mm1958 · driest 0 mm in 1949	125
May	38.9°C31 May 2001	0.6°C5 May 1952	106 mm25 May 1906	246 mm1915 · driest 0 mm in 2021	123
June	43.3°C14 Jun 2000	2.8°C10 Jun 1932	49 mm2 Jun 1967	87 mm1967 · driest 0 mm in 1926	125
July	44.4°C11 Jul 1913	3.9°C31 Jul 1919	62 mm8 Jul 1974	84 mm1974 · driest 0 mm in 1972	121
August	41.1°C1 Aug 1993	2.8°C22 Aug 1917	31 mm20 Aug 1997	44 mm1976 · driest 0 mm in 1904	121
September	43.3°C6 Sep 2022	1.1°C27 Sep 1926	98 mm18 Sep 1959	142 mm1904 · driest 0 mm in 2021	124
October	38.9°C6 Oct 2024	-2.2°C31 Oct 1935	282 mm24 Oct 2021	517 mm2021 · driest 0 mm in 1913	122
November	31.7°C17 Nov 1932	-3.9°C23 Nov 1931	202 mm5 Nov 1994	661 mm1973 · driest 0 mm in 1929	123
December	26.1°C3 Dec 1927	-8.3°C31 Dec 1915	204 mm10 Dec 1937	825 mm1955 · driest 0 mm in 1989	122

Typical days per month at KENTFIELD, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)
January	0	0	2	6
February	<1	0	<1	6
March	3	0	0	5
April	6	1	0	2
May	10	4	0	1
June	17	7	0	<1
July	25	9	0	0
August	24	10	0	0
September	21	10	0	<1
October	14	4	0	1
November	1	0	<1	3
December	0	0	2	7

How often, not how much — every day in KENTFIELD’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	2%	37%	22%	45%	11.2–15.3°C
February	13%	34%	20%	41%	13.9–18.3°C
March	33%	30%	15%	36%	15.8–21.4°C
April	54%	19%	8%	17%	18.3–23.3°C
May	75%	10%	3%	7%	20.6–25.8°C
June	93%	3%	<1%	<1%	23.9–28.5°C
July	99%	<1%	<1%	0%	26.8–30.4°C
August	99%	<1%	<1%	<1%	26.1–30.0°C
September	94%	4%	1%	3%	25.5–29.7°C
October	77%	11%	5%	11%	21.6–26.5°C
November	27%	24%	14%	29%	15.7–20.3°C
December	3%	32%	19%	40%	11.6–15.6°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.

1902Each stripe is one year’s mean temperature against the 105-year average. Warmest: 2014. Coolest: 1922.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 5401017
NOAA station: USC00044500 · KENTFIELD
Station distance: 8.6 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 29 usable years
Daylight: Calculated from latitude 37.88°, mid-month, sunrise to sunset including refraction. Not a station measurement.
Sea temperature: NOAA OISST v2.1 1991–2020 monthly climatology, nearest open water 7 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 KENTFIELD is what differs

San Rafael→Mill Valley→San Anselmo→Larkspur→Tamalpais-Homestead Valley→Corte Madera→

Or put two places side by side: Tamalpais Valley vs San Rafael

Best time to visitTamalpais Valley.

May

August

May

The whole year,without the guesswork.

Tamalpais Valley runs +0.4°Con the 1961–1990 baseline.

Nearby, measured,and named.

Best time to visit
Tamalpais Valley.

The whole year,
without the guesswork.

Tamalpais Valley runs +0.4°C
on the 1961–1990 baseline.

Nearby, measured,
and named.