United States · 1991–2020

Best time to visit
Rockcreek.

September leads for comfortable weather in Rockcreek: typically 24.4°C by day, 8.6°C at night, with 33 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortSeptember

Typical high24.4°C

Typical low8.6°C

Rain in September33 mm

Comfort

September

September · June · July

85climate match

Beach

July

July · August · September

69climate match

Outdoors

May

May · June · September

86climate match

The weakest month is January, scoring 5 against September’s 85 — days reach only 8.1°C, 16° 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

58.1° / 0.9°

Feb

1210° / 0.9°

Mar

2112.7° / 2.4°

Apr

4215.9° / 4°

May

6620° / 7.1°

Jun

8423° / 9.5°

Jul

8127.7° / 11.3°

Aug

8027.9° / 11.2°

Sep

8524.4° / 8.6°

Oct

4817.4° / 5.3°

Nov

1111.2° / 2.6°

Dec

57.6° / 0.7°

Monthly climate evidence for Rockcreek — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	8.1°C	0.9°C	131 mm	15.5	9 h 04	5	Good coverage
February	10°C	0.9°C	92 mm	12.7	10 h 18	12	Good coverage
March	12.7°C	2.4°C	96 mm	14.6	11 h 46	21	Good coverage
April	15.9°C	4°C	61 mm	11.9	13 h 27	42	Good coverage
May	20°C	7.1°C	46 mm	8.8	14 h 52	66	Good coverage
June	23°C	9.5°C	31 mm	6.1	15 h 40	84	Good coverage
July	27.7°C	11.3°C	7 mm	1.6	15 h 21	81	Good coverage
August	27.9°C	11.2°C	11 mm	2.2	14 h 07	80	Good coverage
September	24.4°C	8.6°C	33 mm	5	12 h 28	85	Good coverage
October	17.4°C	5.3°C	80 mm	10.3	10 h 51	48	Good coverage
November	11.2°C	2.6°C	133 mm	14.7	9 h 26	11	Good coverage
December	7.6°C	0.7°C	153 mm	15.8	8 h 43	5	Good coverage

Records at PORTLAND-HILLSBORO AP, 1998–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	17.8°C28 Jan 2024	-16.0°C13 Jan 2017	66 mm1 Jan 2009	302 mm2006 · driest 37 mm in 2013	28
February	18.9°C11 Feb 2022	-8.8°C19 Feb 2006	48 mm12 Feb 2019	256 mm2017 · driest 17 mm in 2005	28
March	26.1°C25 Mar 2025	-6.6°C5 Mar 2019	37 mm14 Mar 2015	177 mm2017 · driest 33 mm in 2021	28
April	32.2°C28 Apr 2023	-3.8°C1 Apr 2008	30 mm10 Apr 2023	150 mm2003 · driest 11 mm in 2021	28
May	34.4°C27 May 2005	-1.1°C8 May 2002	25 mm22 May 2013	111 mm2005 · driest 3 mm in 2018	28
June	45.6°C28 Jun 2021	1.7°C4 Jun 2001	37 mm6 Jun 2010	90 mm2010 · driest 4 mm in 2003	28
July	42.2°C21 Jul 2006	3.9°C2 Jul 2000	14 mm17 Jul 2011	31 mm2011 · driest 0 mm in 2004	29
August	41.7°C14 Aug 2023	3.3°C31 Aug 2008	20 mm22 Aug 2004	59 mm2004 · driest 0 mm in 2022	28
September	37.8°C5 Sep 2024	-1.1°C27 Sep 1999	44 mm28 Sep 2013	159 mm2013 · driest 1 mm in 2012	28
October	31.7°C8 Oct 2022	-6.7°C31 Oct 2002	52 mm13 Oct 2016	220 mm2016 · driest 11 mm in 2002	28
November	21.1°C3 Nov 2010	-9.3°C24 Nov 2010	59 mm25 Nov 1998	327 mm2006 · driest 29 mm in 2019	28
December	17.2°C15 Dec 2025	-15.6°C22 Dec 1998	64 mm26 Dec 2022	371 mm2015 · driest 28 mm in 2013	28

Typical days per month at PORTLAND-HILLSBORO AP, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)
January	0	0	13	4
February	0	0	13	3
March	0	0	9	3
April	2	<1	3	1
May	6	2	<1	1
June	10	4	0	<1
July	22	10	0	0
August	23	10	0	<1
September	13	5	<1	1
October	2	<1	3	3
November	0	0	9	5
December	0	0	14	5

How often, not how much — every day in PORTLAND-HILLSBORO AP’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%	49%	14%	66%	5.9–10.2°C
February	0%	45%	10%	59%	8.0–12.0°C
March	6%	47%	9%	66%	10.7–14.5°C
April	20%	39%	5%	54%	13.8–18.5°C
May	44%	27%	3%	31%	17.5–22.2°C
June	66%	19%	2%	17%	20.6–25.3°C
July	93%	5%	<1%	2%	25.8–30.2°C
August	92%	7%	<1%	4%	26.4–29.8°C
September	75%	17%	4%	18%	22.2–26.3°C
October	27%	34%	8%	50%	15.9–19.1°C
November	<1%	50%	15%	69%	9.8–12.8°C
December	0%	52%	18%	70%	5.8–9.7°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.

1999Each stripe is one year’s mean temperature against the 27-year average. Warmest: 2015. Coolest: 2011.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 5749017
NOAA station: USW00094261 · PORTLAND-HILLSBORO AP
Station distance: 6.1 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 22 usable years
Daylight: Calculated from latitude 45.55°, 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 PORTLAND-HILLSBORO AP is what differs

Hillsboro→Bethany→North Plains→Folkenberg→Glencoe→Helvetia→

Or put two places side by side: Rockcreek vs Hillsboro

Best time to visitRockcreek.

September

July

May

The whole year,without the guesswork.

Nearby, measured,and named.

Best time to visit
Rockcreek.

The whole year,
without the guesswork.

Nearby, measured,
and named.