Point Forecast: 2 Miles NNE Portola Valley CA  37.4N 122.2W (Elev. 397 ft)	Last Update: 1:26 am PDT Jun 17, 2025

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Weather Elements Weather/Precipitation Temperature (°F) Dewpoint (°F) Heat Index (°F) Surface Wind  ktmphkm/hm/s Sky Cover (%) Precipitation Potential (%) Relative Humidity (%) Rain Thunder Fog Trans. Wind  ktmphkm/hm/s 20ft Wind  ktmphkm/hm/s

48-Hour Period Starting: 1am Tue, Jun 17 20252am Tue, Jun 17 20253am Tue, Jun 17 20254am Tue, Jun 17 20255am Tue, Jun 17 20256am Tue, Jun 17 20257am Tue, Jun 17 20258am Tue, Jun 17 20259am Tue, Jun 17 202510am Tue, Jun 17 202511am Tue, Jun 17 202512pm Tue, Jun 17 20251pm Tue, Jun 17 20252pm Tue, Jun 17 20253pm Tue, Jun 17 20254pm Tue, Jun 17 20255pm Tue, Jun 17 20256pm Tue, Jun 17 20257pm Tue, Jun 17 20258pm Tue, Jun 17 20259pm Tue, Jun 17 202510pm Tue, Jun 17 202511pm Tue, Jun 17 202512am Wed, Jun 18 20251am Wed, Jun 18 20252am Wed, Jun 18 20253am Wed, Jun 18 20254am Wed, Jun 18 20255am Wed, Jun 18 20256am Wed, Jun 18 20257am Wed, Jun 18 20258am Wed, Jun 18 20259am Wed, Jun 18 202510am Wed, Jun 18 202511am Wed, Jun 18 202512pm Wed, Jun 18 20251pm Wed, Jun 18 20252pm Wed, Jun 18 20253pm Wed, Jun 18 20254pm Wed, Jun 18 20255pm Wed, Jun 18 20256pm Wed, Jun 18 20257pm Wed, Jun 18 20258pm Wed, Jun 18 20259pm Wed, Jun 18 202510pm Wed, Jun 18 202511pm Wed, Jun 18 202512am Thu, Jun 19 20251am Thu, Jun 19 20252am Thu, Jun 19 20253am Thu, Jun 19 20254am Thu, Jun 19 20255am Thu, Jun 19 20256am Thu, Jun 19 20257am Thu, Jun 19 20258am Thu, Jun 19 20259am Thu, Jun 19 202510am Thu, Jun 19 202511am Thu, Jun 19 202512pm Thu, Jun 19 20251pm Thu, Jun 19 20252pm Thu, Jun 19 20253pm Thu, Jun 19 20254pm Thu, Jun 19 20255pm Thu, Jun 19 20256pm Thu, Jun 19 20257pm Thu, Jun 19 20258pm Thu, Jun 19 20259pm Thu, Jun 19 202510pm Thu, Jun 19 202511pm Thu, Jun 19 202512am Fri, Jun 20 20251am Fri, Jun 20 20252am Fri, Jun 20 20253am Fri, Jun 20 20254am Fri, Jun 20 20255am Fri, Jun 20 20256am Fri, Jun 20 20257am Fri, Jun 20 20258am Fri, Jun 20 20259am Fri, Jun 20 202510am Fri, Jun 20 202511am Fri, Jun 20 202512pm Fri, Jun 20 20251pm Fri, Jun 20 20252pm Fri, Jun 20 20253pm Fri, Jun 20 20254pm Fri, Jun 20 20255pm Fri, Jun 20 20256pm Fri, Jun 20 20257pm Fri, Jun 20 20258pm Fri, Jun 20 20259pm Fri, Jun 20 202510pm Fri, Jun 20 202511pm Fri, Jun 20 202512am Sat, Jun 21 20251am Sat, Jun 21 20252am Sat, Jun 21 20253am Sat, Jun 21 20254am Sat, Jun 21 20255am Sat, Jun 21 20256am Sat, Jun 21 20257am Sat, Jun 21 20258am Sat, Jun 21 20259am Sat, Jun 21 202510am Sat, Jun 21 202511am Sat, Jun 21 202512pm Sat, Jun 21 2025

Date	06/17																							06/18
Hour (PDT)	01	02	03	04	05	06	07	08	09	10	11	12	13	14	15	16	17	18	19	20	21	22	23	00
Temperature (°F)	52	51	51	50	51	50	53	58	63	66	70	75	77	78	78	77	76	74	69	65	61	58	57	54
Dewpoint (°F)	45	45	44	44	44	44	46	48	49	50	51	52	52	52	52	51	52	52	50	50	49	50	50	50
Heat Index (°F)												75	77	78	78	77	76
Surface Wind (mph)	6	5	5	5	7	7	3	2	3	3	3	5	8	10	10	11	11	10	9	9	10	9	8	7
Wind Dir	WSW	WSW	WSW	SW	SW	SW	WSW	NNW	N	N	NNW	WNW	W	W	W	W	W	W	W	WSW	SW	SW	SW	SW
Gust
Sky Cover (%)	13	14	17	15	12	18	16	18	23	10	4	3	1	2	1	1	1	2	4	4	8	6	8	12
Precipitation Potential (%)	1	1	1	1	1	1	1	1	1	1	0	0	0	0	0	0	1	1	1	1	1	1	0	0
Relative Humidity (%)	75	78	76	78	78	79	77	71	61	56	50	44	42	40	40	40	42	47	51	58	65	73	78	86
Rain	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--
Thunder	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--
Date																								06/19
Hour (PDT)	01	02	03	04	05	06	07	08	09	10	11	12	13	14	15	16	17	18	19	20	21	22	23	00
Temperature (°F)	54	53	52	52	52	52	54	58	64	68	74	78	80	81	82	82	80	76	70	65	61	58	56	54
Dewpoint (°F)	50	50	49	49	49	49	50	51	54	55	57	57	58	58	57	56	55	54	52	50	50	49	49	48
Heat Index (°F)												78	81	81	82	81	80	76
Surface Wind (mph)	6	5	3	3	3	2	3	3	3	3	6	6	6	10	10	10	10	10	10	9	9	9	7	7
Wind Dir	SW	SW	SW	SW	SW	SW	WSW	W	W	WNW	NW	NW	NW	WNW	WNW	WNW	W	W	W	W	W	W	W	W
Gust																	20	20	20
Sky Cover (%)	20	21	24	24	20	25	21	25	28	10	6	6	6	2	2	2	2	2	2	5	5	5	4	4
Precipitation Potential (%)	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
Relative Humidity (%)	86	89	89	90	90	92	86	78	70	63	54	49	46	45	42	41	42	46	53	60	66	72	78	81
Rain	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--
Thunder	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--

International System of Units Forecast Discussion 7-Day Forecast Hourly Weather Graph River Stage Summary 24 Hour Precipitation Summary NWS Office Map