United States · 1991–2020

Best time to visit
Bryn Mawr-Skyway.

July leads for comfortable weather in Bryn Mawr-Skyway: typically 25.3°C by day, 14.4°C at night, with 13 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortJuly

Typical high25.3°C

Typical low14.4°C

Rain in July13 mm

Comfort

July

July · August · June

95climate match

Beach

August

August · July · June

71climate match

Outdoors

May

May · June · September

87climate match

The weakest month is December, scoring 5 against July’s 95 — days reach only 8.3°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

68.8° / 2.9°

Feb

1710° / 2.7°

Mar

2412.3° / 4.2°

Apr

4315.2° / 6.2°

May

6618.9° / 9.4°

Jun

8421.8° / 12.1°

Jul

9525.3° / 14.4°

Aug

9425.4° / 14.5°

Sep

8421.9° / 11.9°

Oct

4716° / 8.1°

Nov

1511.3° / 4.6°

Dec

58.3° / 2.5°

Monthly climate evidence for Bryn Mawr-Skyway — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	8.8°C	2.9°C	120 mm	14.7	8 h 50	6	Good coverage
February	10°C	2.7°C	78 mm	12.1	10 h 10	17	Good coverage
March	12.3°C	4.2°C	94 mm	14	11 h 44	24	Good coverage
April	15.2°C	6.2°C	65 mm	11.4	13 h 33	43	Good coverage
May	18.9°C	9.4°C	48 mm	8.7	15 h 05	66	Good coverage
June	21.8°C	12.1°C	36 mm	6.6	15 h 56	84	Good coverage
July	25.3°C	14.4°C	13 mm	2.5	15 h 36	95	Good coverage
August	25.4°C	14.5°C	22 mm	3	14 h 16	94	Good coverage
September	21.9°C	11.9°C	41 mm	6.2	12 h 30	84	Good coverage
October	16°C	8.1°C	92 mm	10.5	10 h 46	47	Good coverage
November	11.3°C	4.6°C	138 mm	14.3	9 h 14	15	Good coverage
December	8.3°C	2.5°C	114 mm	13.9	8 h 28	5	Good coverage

Records at RENTON MUNI AP, 1998–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	17.8°C15 Jan 2018	-8.2°C12 Jan 2024	54 mm17 Jan 2005	294 mm2006 · driest 11 mm in 2025	28
February	18.9°C17 Feb 2016	-7.7°C10 Feb 2019	36 mm28 Feb 2022	160 mm1999 · driest 15 mm in 2023	28
March	26.1°C19 Mar 2019	-3.8°C11 Mar 2009	43 mm15 Mar 2015	211 mm2014 · driest 15 mm in 2023	28
April	30.6°C18 Apr 2016	-0.5°C11 Apr 2021	35 mm13 Apr 2002	134 mm2013 · driest 8 mm in 2021	28
May	33.3°C14 May 2023	2.8°C10 May 1999	28 mm3 May 2014	86 mm2005 · driest 0 mm in 2018	28
June	42.8°C28 Jun 2021	6.7°C8 Jun 2002	31 mm11 Jun 2001	76 mm2001 · driest 0 mm in 2025	28
July	40.6°C29 Jul 2009	9.4°C31 Jul 2008	27 mm23 Jul 2014	36 mm2007 · driest 0 mm in 2017	27
August	36.7°C16 Aug 2020	8.3°C24 Aug 2003	26 mm24 Aug 2008	88 mm2008 · driest 0 mm in 2012	27
September	32.8°C10 Sep 2020	4.4°C30 Sep 2019	42 mm28 Sep 2013	150 mm2013 · driest 3 mm in 2022	27
October	30.0°C16 Oct 2022	-2.2°C31 Oct 2003	114 mm20 Oct 2003	197 mm2003 · driest 22 mm in 2002	28
November	23.9°C3 Nov 2010	-9.9°C24 Nov 2010	80 mm25 Nov 1998	343 mm2006 · driest 23 mm in 2019	28
December	20.0°C10 Dec 2014	-9.4°C20 Dec 1998	67 mm20 Dec 2019	223 mm2015 · driest 1 mm in 2011	28

Typical days per month at RENTON MUNI AP, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)
January	0	0	7	4
February	0	0	7	2
March	<1	0	3	3
April	<1	0	<1	2
May	3	<1	0	1
June	7	2	0	<1
July	17	4	0	<1
August	17	4	0	<1
September	7	1	0	1
October	<1	0	<1	3
November	0	0	4	4
December	0	0	8	4

How often, not how much — every day in RENTON MUNI 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%	44%	11%	60%	7.0–10.4°C
February	0%	39%	7%	54%	8.3–11.5°C
March	2%	42%	8%	57%	10.4–14.4°C
April	12%	34%	5%	44%	13.8–16.8°C
May	34%	26%	3%	29%	16.6–20.7°C
June	59%	20%	3%	20%	19.7–23.7°C
July	90%	7%	<1%	3%	23.8–27.7°C
August	90%	9%	2%	8%	24.2–26.8°C
September	64%	19%	3%	22%	20.6–23.6°C
October	13%	32%	9%	45%	14.9–17.9°C
November	<1%	46%	13%	63%	9.8–12.7°C
December	0%	45%	11%	61%	6.2–10.3°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 25-year average. Warmest: 2015. Coolest: 2011.2023

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 7260966
NOAA station: USW00094248 · RENTON MUNI AP
Station distance: 2 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 22 usable years
Daylight: Calculated from latitude 47.49°, 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 RENTON MUNI AP is what differs

Renton→Issaquah→West Lake Sammamish→Tukwila→Fairwood→Newcastle→

Or put two places side by side: Bryn Mawr-Skyway vs Renton

Best time to visitBryn Mawr-Skyway.

July

August

May

The whole year,without the guesswork.

Nearby, measured,and named.

Best time to visit
Bryn Mawr-Skyway.

The whole year,
without the guesswork.

Nearby, measured,
and named.