United States · 1991–2020

Best time to visit
Hillsboro.

August leads for comfortable weather in Hillsboro: typically 26.4°C by day, 14.1°C at night, with 109 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortAugust

Typical high26.4°C

Typical low14.1°C

Rain in August109 mm

Comfort

August

August · June · July

75climate match

Beach

July

July · August · June

58climate match

Outdoors

September

September · May · October

76climate match

The weakest month is January, scoring 5 against August’s 75 — days reach only -3.2°C, 27° 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

5-3.2° / -14.1°

Feb

5-0.2° / -11.6°

Mar

56.1° / -5.6°

Apr

2613.8° / 1.2°

May

5320.2° / 7.2°

Jun

7225.3° / 13°

Jul

7227.3° / 15.1°

Aug

7526.4° / 14.1°

Sep

7122.3° / 9°

Oct

4015.3° / 2.6°

Nov

57° / -3.3°

Dec

5-0.1° / -10.4°

Monthly climate evidence for Hillsboro — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	-3.2°C	-14.1°C	33 mm	6.2	9 h 16	5	Good coverage
February	-0.2°C	-11.6°C	28 mm	4.8	10 h 25	5	Good coverage
March	6.1°C	-5.6°C	48 mm	7.1	11 h 47	5	Good coverage
April	13.8°C	1.2°C	105 mm	9.6	13 h 22	26	Good coverage
May	20.2°C	7.2°C	122 mm	11.6	14 h 41	53	Good coverage
June	25.3°C	13°C	131 mm	10.3	15 h 25	72	Good coverage
July	27.3°C	15.1°C	112 mm	9.5	15 h 08	72	Good coverage
August	26.4°C	14.1°C	109 mm	8.9	13 h 59	75	Good coverage
September	22.3°C	9°C	89 mm	8.1	12 h 27	71	Good coverage
October	15.3°C	2.6°C	67 mm	8.1	10 h 56	40	Good coverage
November	7°C	-3.3°C	58 mm	6.6	9 h 36	5	Good coverage
December	-0.1°C	-10.4°C	34 mm	6.3	8 h 57	5	Good coverage

Records at HILLSBORO, 1959–2010
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	15.0°C26 Jan 1981	-42.2°C15 Jan 1963	27 mm8 Jan 2008	61 mm1996 · driest 1 mm in 1962	50
February	16.1°C18 Feb 1981	-40.0°C3 Feb 1996	31 mm19 Feb 1971	73 mm1971 · driest 0 mm in 1964	48
March	28.3°C29 Mar 1986	-38.9°C1 Mar 1962	53 mm31 Mar 1998	109 mm1998 · driest 7 mm in 1994	51
April	32.8°C23 Apr 1980	-16.7°C6 Apr 1982	81 mm4 Apr 1981	186 mm2008 · driest 13 mm in 1997	51
May	33.3°C23 May 1980	-7.2°C10 May 1966	85 mm18 May 2000	357 mm2004 · driest 14 mm in 1976	51
June	37.8°C21 Jun 1988	0.0°C1 Jun 1964	118 mm8 Jun 2008	262 mm1990 · driest 14 mm in 1966	51
July	37.8°C7 Jul 1980	5.0°C7 Jul 1997	91 mm15 Jul 2010	255 mm2010 · driest 33 mm in 1967	50
August	38.3°C17 Aug 1988	0.6°C14 Aug 1964	114 mm19 Aug 2007	356 mm2007 · driest 2 mm in 1970	50
September	35.6°C9 Sep 1978	-5.0°C29 Sep 1967	86 mm10 Sep 1994	288 mm1992 · driest 18 mm in 1982	49
October	33.3°C6 Oct 1963	-11.7°C29 Oct 1988	75 mm21 Oct 1965	209 mm1984 · driest 4 mm in 1964	48
November	23.9°C4 Nov 2008	-23.3°C27 Nov 1996	62 mm4 Nov 2003	140 mm1982 · driest 0 mm in 1976	47
December	17.8°C6 Dec 2001	-36.1°C18 Dec 1983	37 mm2 Dec 2007	87 mm2009 · driest 3 mm in 1993	50

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	30	<1	7
February	0	0	27	<1	6
March	<1	0	26	1	4
April	2	<1	13	3	1
May	7	<1	2	4	0
June	18	5	0	4	0
July	24	7	0	4	0
August	22	5	0	3	0
September	11	2	<1	3	0
October	2	<1	11	2	<1
November	0	0	22	2	2
December	0	0	29	<1	6

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	0%	17%	2%	13%	-6.8–0.3°C
February	0%	16%	3%	12%	-3.8–3.4°C
March	3%	22%	4%	23%	3.4–8.8°C
April	16%	29%	9%	35%	11.2–16.8°C
May	44%	31%	11%	38%	18.2–23.7°C
June	65%	30%	12%	36%	23.8–27.5°C
July	75%	25%	11%	25%	26.1–30.7°C
August	72%	26%	10%	25%	24.9–29.5°C
September	55%	26%	10%	32%	20.4–25.2°C
October	21%	22%	7%	17%	12.7–18.5°C
November	2%	21%	5%	19%	3.1–9.7°C
December	0%	18%	3%	14%	-3.8–3.1°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.

1960Each stripe is one year’s mean temperature against the 40-year average. Warmest: 1998. Coolest: 1996.2009

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 5256376
NOAA station: USC00473654 · HILLSBORO
Station distance: 0.8 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 19 usable years
Daylight: Calculated from latitude 43.65°, 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

Elroy→Wonewoc→Greenwood→Kendall→Union Center→Yuba→

Or put two places side by side: Hillsboro vs Elroy

Best time to visitHillsboro.