United States · 1991–2020

Best time to visit
Hillsboro.

September leads for comfortable weather in Hillsboro: typically 27.6°C by day, 14.1°C at night, with 85 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortSeptember

Typical high27.6°C

Typical low14.1°C

Rain in September85 mm

Comfort

September

September · May · October

77climate match

Beach

August

August · July · June

75climate match

Outdoors

October

October · April · September

80climate match

The weakest month is January, scoring 5 against September’s 77 — days reach only 3.4°C, 21° 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

53.4° / -5.7°

Feb

56.9° / -3.4°

Mar

2813° / 1.5°

Apr

5220.1° / 7.1°

May

7025.2° / 12.8°

Jun

6030° / 17.8°

Jul

5431.6° / 19.6°

Aug

6130.8° / 18.6°

Sep

7727.6° / 14.1°

Oct

6620.9° / 8°

Nov

2912.6° / 2.1°

Dec

55.9° / -2.9°

Monthly climate evidence for Hillsboro — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	3.4°C	-5.7°C	70 mm	5.8	9 h 42	5	Strong coverage
February	6.9°C	-3.4°C	56 mm	5.5	10 h 40	5	Strong coverage
March	13°C	1.5°C	85 mm	7.5	11 h 50	28	Strong coverage
April	20.1°C	7.1°C	140 mm	9.5	13 h 10	52	Strong coverage
May	25.2°C	12.8°C	140 mm	10.9	14 h 18	70	Strong coverage
June	30°C	17.8°C	109 mm	8.1	14 h 54	60	Strong coverage
July	31.6°C	19.6°C	99 mm	7	14 h 40	54	Strong coverage
August	30.8°C	18.6°C	87 mm	6.2	13 h 42	61	Strong coverage
September	27.6°C	14.1°C	85 mm	6.2	12 h 24	77	Strong coverage
October	20.9°C	8°C	92 mm	6.6	11 h 06	66	Strong coverage
November	12.6°C	2.1°C	83 mm	6.3	9 h 59	29	Strong coverage
December	5.9°C	-2.9°C	74 mm	6.1	9 h 26	5	Strong coverage

What has changed

Hillsboro runs +0.7°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

+1.0

Feb

+0.8

Mar

+1.0

Apr

+0.1

May

+0.4

Jun

+0.7

Jul

-0.3

Aug

-0.3

Sep

+1.2

Oct

+0.8

Nov

+0.2

Dec

+2.5

September daytime highs, 2011–2025. Last recorded: 29.2°C.

Records at HILLSBORO, 1895–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	23.9°C23 Jan 1909	-29.4°C12 Jan 1918	74 mm11 Jan 2020	222 mm1950 · driest 1 mm in 1986	127
February	26.1°C10 Feb 1932	-30.0°C14 Feb 1905	58 mm10 Feb 1959	160 mm1951 · driest 2 mm in 1947	128
March	32.2°C24 Mar 1929	-23.3°C6 Mar 1960	81 mm14 Mar 1922	235 mm1938 · driest 0 mm in 1910	127
April	33.3°C26 Apr 1989	-7.8°C5 Apr 1920	119 mm28 Apr 1996	331 mm1994 · driest 11 mm in 2022	126
May	37.2°C31 May 1895	-2.2°C25 May 1925	102 mm25 May 1990	341 mm1990 · driest 3 mm in 1914	128
June	41.1°C30 Jun 1931	2.8°C16 Jun 1917	104 mm28 Jun 1951	307 mm1957 · driest 5 mm in 1933	130
July	45.6°C14 Jul 1954	7.2°C15 Jul 1930	122 mm24 Jul 2010	279 mm1958 · driest 4 mm in 2012	129
August	44.4°C4 Aug 1918	3.9°C29 Aug 1986	139 mm21 Aug 1915	333 mm1915 · driest 5 mm in 2025	129
September	40.6°C4 Sep 1954	-3.3°C30 Sep 1899	126 mm17 Sep 1969	240 mm2008 · driest 0 mm in 1897	129
October	35.0°C3 Oct 1922	-8.3°C29 Oct 1925	166 mm18 Oct 1905	305 mm2009 · driest 3 mm in 1908	130
November	28.3°C1 Nov 1950	-20.6°C25 Nov 1950	91 mm4 Nov 2024	243 mm1985 · driest 2 mm in 1904	128
December	23.3°C3 Dec 1970	-28.9°C22 Dec 1989	121 mm26 Dec 2015	278 mm2015 · driest 1 mm in 1955	129

Typical days per month at HILLSBORO, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	25	2	2
February	<1	0	20	2	2
March	2	0	14	3	<1
April	7	<1	3	5	<1
May	17	6	0	4	0
June	25	16	0	4	0
July	28	21	0	3	0
August	28	18	0	2	0
September	21	9	<1	3	0
October	8	1	2	3	0
November	<1	0	11	3	<1
December	0	0	22	2	1

How often, not how much — every day in HILLSBORO’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%	20%	6%	18%	0.0–7.1°C
February	2%	21%	7%	18%	1.7–10.0°C
March	14%	27%	10%	29%	8.4–16.5°C
April	35%	30%	13%	36%	16.4–22.2°C
May	60%	31%	13%	36%	22.0–27.0°C
June	73%	27%	12%	29%	27.1–32.1°C
July	78%	22%	11%	20%	29.8–34.4°C
August	79%	21%	9%	19%	28.9–33.3°C
September	75%	21%	9%	19%	24.9–30.1°C
October	51%	21%	9%	20%	18.7–23.7°C
November	12%	22%	9%	20%	9.1–15.2°C
December	<1%	21%	7%	20%	1.7–8.7°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.

1897Each stripe is one year’s mean temperature against the 115-year average. Warmest: 1998. Coolest: 1917.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 4240782
NOAA station: USC00114108 · HILLSBORO
Station distance: 0.3 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 25 usable years
Daylight: Calculated from latitude 39.16°, 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 HILLSBORO is what differs

Litchfield→Staunton→Mount Olive→Witt→Livingston→Taylor Springs→

Or put two places side by side: Hillsboro vs Litchfield

Best time to visitHillsboro.