United States · 1991–2020

Best time to visit
Arivaca Junction.

March leads for comfortable weather in Arivaca Junction: typically 23.1°C by day, 3.4°C at night, with 21 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortMarch

Typical high23.1°C

Typical low3.4°C

Rain in March21 mm

Comfort

March

March · October · November

76climate match

Beach

September

September · October · May

71climate match

Outdoors

February

February · November · March

83climate match

The weakest month is July, scoring 40 against March’s 76 — days average 35.1°C, 11° above 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

5418.4° / 0°

Feb

6019.7° / 1°

Mar

7623.1° / 3.4°

Apr

7426.7° / 5.7°

May

6731° / 9.5°

Jun

6036° / 15°

Jul

4035.1° / 19.3°

Aug

4333.8° / 18.7°

Sep

6932.3° / 15.3°

Oct

7528.2° / 8.7°

Nov

7522.7° / 3.4°

Dec

5318° / -0.2°

Monthly climate evidence for Arivaca Junction — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	18.4°C	0°C	22 mm	3	10 h 17	54	Strong coverage
February	19.7°C	1°C	28 mm	3.5	11 h 01	60	Strong coverage
March	23.1°C	3.4°C	21 mm	2.2	11 h 53	76	Strong coverage
April	26.7°C	5.7°C	9 mm	1.2	12 h 55	74	Strong coverage
May	31°C	9.5°C	4 mm	0.7	13 h 45	67	Strong coverage
June	36°C	15°C	12 mm	1.6	14 h 12	60	Strong coverage
July	35.1°C	19.3°C	99 mm	10.2	14 h 02	40	Strong coverage
August	33.8°C	18.7°C	112 mm	11.2	13 h 18	43	Strong coverage
September	32.3°C	15.3°C	46 mm	4.3	12 h 19	69	Strong coverage
October	28.2°C	8.7°C	24 mm	2.1	11 h 20	75	Strong coverage
November	22.7°C	3.4°C	16 mm	1.7	10 h 30	75	Good coverage
December	18°C	-0.2°C	23 mm	3	10 h 05	53	Strong coverage

What has changed

Arivaca Junction runs -0.5°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

-0.5

Feb

-0.6

Mar

+0.4

Apr

-0.4

May

-1.4

Jun

-0.6

Jul

-1.6

Aug

-0.3

Sep

-1.0

Oct

-0.2

Nov

-0.1

Dec

-0.3

March daytime highs, 2011–2025. Last recorded: 23.8°C.

Records at TUMACACORI NM, 1946–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	31.7°C19 Jan 1971	-15.6°C12 Jan 2013	57 mm18 Jan 1993	180 mm1993 · driest 0 mm in 1972	80
February	33.3°C13 Feb 1957	-12.8°C10 Feb 2013	48 mm11 Feb 1991	107 mm1998 · driest 0 mm in 2021	79
March	37.8°C22 Mar 2026	-9.4°C3 Mar 2002	50 mm28 Mar 1992	103 mm1992 · driest 0 mm in 1984	79
April	37.8°C20 Apr 1989	-6.7°C2 Apr 2014	33 mm6 Apr 2001	44 mm1951 · driest 0 mm in 1955	80
May	42.8°C28 May 1958	-2.2°C5 May 1950	26 mm21 May 1992	28 mm1997 · driest 0 mm in 2002	81
June	45.0°C25 Jun 1970	3.3°C8 Jun 1995	39 mm27 Jun 2008	81 mm2000 · driest 0 mm in 2014	81
July	45.0°C5 Jul 1983	5.6°C3 Jul 1995	74 mm30 Jul 1979	268 mm1984 · driest 10 mm in 1994	79
August	42.8°C8 Aug 2025	8.3°C17 Aug 1958	88 mm5 Aug 1958	224 mm1994 · driest 10 mm in 1956	79
September	42.2°C1 Sep 1950	2.2°C30 Sep 1965	73 mm7 Sep 2016	162 mm1983 · driest 0 mm in 1955	79
October	40.0°C2 Oct 1980	-7.8°C17 Oct 2013	92 mm1 Oct 1983	186 mm2000 · driest 0 mm in 2016	79
November	33.9°C1 Nov 1968	-12.8°C24 Nov 2014	83 mm11 Nov 1994	96 mm2019 · driest 0 mm in 1970	78
December	31.1°C3 Dec 1954	-15.0°C8 Dec 1978	81 mm5 Dec 1994	163 mm1965 · driest 0 mm in 1995	80

Typical days per month at TUMACACORI NM, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)
January	2	0	16	<1
February	4	<1	12	<1
March	13	2	6	<1
April	21	8	2	<1
May	28	20	<1	<1
June	30	29	0	<1
July	31	28	0	3
August	30	28	0	3
September	29	24	0	2
October	24	12	<1	<1
November	10	2	6	<1
December	2	0	15	<1

How often, not how much — every day in TUMACACORI NM’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	44%	11%	3%	7%	16.4–21.2°C
February	56%	10%	2%	7%	17.6–23.2°C
March	73%	8%	2%	4%	20.3–25.6°C
April	92%	4%	<1%	1%	25.3–29.1°C
May	97%	3%	<1%	1%	29.3–33.3°C
June	95%	5%	1%	6%	35.0–38.2°C
July	64%	36%	11%	49%	33.6–37.6°C
August	69%	31%	10%	33%	32.5–36.1°C
September	84%	16%	5%	13%	31.2–35.2°C
October	91%	7%	3%	4%	26.3–31.7°C
November	74%	7%	2%	3%	20.8–26.0°C
December	47%	11%	3%	7%	16.5–21.8°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.

1947Each stripe is one year’s mean temperature against the 68-year average. Warmest: 1980. Coolest: 1998.2021

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 5551650
NOAA station: USC00028865 · TUMACACORI NM
Station distance: 17.8 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 24 usable years
Daylight: Calculated from latitude 31.73°, 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 TUMACACORI NM is what differs

Tubac→Tumacacori-Carmen→Amado→Carmen→Casa Piedra→Old Glory→

Or put two places side by side: Arivaca Junction vs Tubac

Best time to visitArivaca Junction.