United States · 1991–2020

Best time to visit
Livermore.

September leads for comfortable weather in Livermore: typically 27.7°C by day, 15.5°C at night, with 76 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortSeptember

Typical high27.7°C

Typical low15.5°C

Rain in September76 mm

Comfort

September

September · May · October

79climate match

Beach

August

August · July · June

83climate match

Outdoors

October

October · April · May

82climate match

The weakest month is January, scoring 5 against September’s 79 — days reach only 6.3°C, 18° 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

56.3° / -3°

Feb

57.6° / -2.1°

Mar

3214.4° / 3.2°

Apr

6220.5° / 8.6°

May

7824.9° / 13.9°

Jun

6329.4° / 18.4°

Jul

5730.6° / 20°

Aug

6430.6° / 19.5°

Sep

7927.7° / 15.5°

Oct

7021.2° / 8.9°

Nov

3514.2° / 2.8°

Dec

58.2° / -0.9°

Monthly climate evidence for Livermore — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	6.3°C	-3°C	91 mm	7.9	9 h 50	5	Good coverage
February	7.6°C	-2.1°C	85 mm	6.7	10 h 45	5	Good coverage
March	14.4°C	3.2°C	104 mm	9.1	11 h 50	32	Good coverage
April	20.5°C	8.6°C	105 mm	8.5	13 h 06	62	Good coverage
May	24.9°C	13.9°C	116 mm	9.2	14 h 10	78	Good coverage
June	29.4°C	18.4°C	99 mm	8.1	14 h 44	63	Good coverage
July	30.6°C	20°C	98 mm	7.1	14 h 31	57	Good coverage
August	30.6°C	19.5°C	66 mm	5.5	13 h 36	64	Good coverage
September	27.7°C	15.5°C	76 mm	5.5	12 h 23	79	Good coverage
October	21.2°C	8.9°C	86 mm	6.1	11 h 10	70	Good coverage
November	14.2°C	2.8°C	82 mm	7.3	10 h 06	35	Good coverage
December	8.2°C	-0.9°C	105 mm	8	9 h 35	5	Good coverage

Records at CALHOUN 4ENE, 1979–2021
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	21.7°C3 Jan 2006	-18.9°C5 Jan 2014	76 mm20 Jan 2016	161 mm2016 · driest 29 mm in 2012	18
February	26.1°C20 Feb 2018	-20.6°C19 Feb 2015	54 mm15 Feb 2003	198 mm2019 · driest 12 mm in 2009	19
March	28.9°C28 Mar 2012	-17.2°C6 Mar 2015	51 mm18 Mar 2013	158 mm2013 · driest 38 mm in 2019	19
April	31.1°C30 Apr 2007	-4.4°C8 Apr 2007	56 mm4 Apr 2008	273 mm2011 · driest 14 mm in 2012	19
May	32.8°C14 May 2018	2.2°C1 May 2005	81 mm2 May 2008	199 mm2008 · driest 54 mm in 2018	19
June	40.0°C29 Jun 2012	7.2°C3 Jun 2009	76 mm28 Jun 2020	224 mm2019 · driest 17 mm in 2010	20
July	39.4°C7 Jul 2012	7.8°C7 Jul 2008	89 mm12 Jul 2016	270 mm2016 · driest 1 mm in 2010	19
August	38.9°C20 Aug 2007	7.2°C8 Aug 2008	48 mm27 Aug 2005	161 mm2005 · driest 1 mm in 2008	18
September	37.2°C2 Sep 2011	3.3°C23 Sep 2012	103 mm2 Sep 2003	218 mm2006 · driest 0 mm in 2019	19
October	36.1°C2 Oct 2019	-2.8°C19 Oct 2018	98 mm6 Oct 2013	164 mm2017 · driest 6 mm in 2005	19
November	28.9°C1 Nov 2016	-12.8°C18 Nov 2014	45 mm2 Nov 2004	201 mm2011 · driest 23 mm in 2009	17
December	22.8°C3 Dec 2012	-22.2°C25 Dec 2004	117 mm15 Dec 2007	253 mm2007 · driest 40 mm in 2019	20

Typical days per month at CALHOUN 4ENE, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	20	3	<1
February	<1	0	17	3	<1
March	2	0	8	3	<1
April	7	<1	1	4	0
May	15	4	0	4	0
June	25	14	0	4	0
July	28	19	0	4	0
August	28	19	0	3	0
September	22	9	0	3	0
October	9	2	<1	3	0
November	<1	0	9	3	0
December	0	0	16	3	<1

How often, not how much — every day in CALHOUN 4ENE’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	<1%	25%	9%	29%	2.9–9.2°C
February	3%	26%	10%	30%	3.7–10.5°C
March	18%	30%	11%	36%	11.9–17.4°C
April	44%	30%	13%	36%	18.5–22.9°C
May	62%	30%	13%	36%	22.7–27.4°C
June	75%	27%	11%	29%	28.0–30.4°C
July	77%	25%	12%	25%	28.6–32.9°C
August	82%	20%	8%	18%	28.6–33.1°C
September	82%	20%	8%	17%	25.9–29.6°C
October	49%	20%	8%	20%	19.0–23.6°C
November	14%	26%	11%	28%	11.4–16.7°C
December	2%	28%	11%	33%	5.0–11.0°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 4298805
NOAA station: USC00151227 · CALHOUN 4ENE
Station distance: 8.5 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 17 usable years
Daylight: Calculated from latitude 37.49°, 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 CALHOUN 4ENE is what differs

Owensboro→Masonville→Calhoun→Sacramento→Island→Beech Grove→

Or put two places side by side: Livermore vs Owensboro

Best time to visitLivermore.