Point Forecast: 2 Miles NNW Portola Valley CA  37.42N 122.23W (Elev. 397 ft)	Last Update: 12:31 pm PDT Oct 7, 2026

[hide menu]

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: 12pm Wed, Oct 7 20261pm Wed, Oct 7 20262pm Wed, Oct 7 20263pm Wed, Oct 7 20264pm Wed, Oct 7 20265pm Wed, Oct 7 20266pm Wed, Oct 7 20267pm Wed, Oct 7 20268pm Wed, Oct 7 20269pm Wed, Oct 7 202610pm Wed, Oct 7 202611pm Wed, Oct 7 202612am Thu, Oct 8 20261am Thu, Oct 8 20262am Thu, Oct 8 20263am Thu, Oct 8 20264am Thu, Oct 8 20265am Thu, Oct 8 20266am Thu, Oct 8 20267am Thu, Oct 8 20268am Thu, Oct 8 20269am Thu, Oct 8 202610am Thu, Oct 8 202611am Thu, Oct 8 202612pm Thu, Oct 8 20261pm Thu, Oct 8 20262pm Thu, Oct 8 20263pm Thu, Oct 8 20264pm Thu, Oct 8 20265pm Thu, Oct 8 20266pm Thu, Oct 8 20267pm Thu, Oct 8 20268pm Thu, Oct 8 20269pm Thu, Oct 8 202610pm Thu, Oct 8 202611pm Thu, Oct 8 202612am Fri, Oct 9 20261am Fri, Oct 9 20262am Fri, Oct 9 20263am Fri, Oct 9 20264am Fri, Oct 9 20265am Fri, Oct 9 20266am Fri, Oct 9 20267am Fri, Oct 9 20268am Fri, Oct 9 20269am Fri, Oct 9 202610am Fri, Oct 9 202611am Fri, Oct 9 202612pm Fri, Oct 9 20261pm Fri, Oct 9 20262pm Fri, Oct 9 20263pm Fri, Oct 9 20264pm Fri, Oct 9 20265pm Fri, Oct 9 20266pm Fri, Oct 9 20267pm Fri, Oct 9 20268pm Fri, Oct 9 20269pm Fri, Oct 9 202610pm Fri, Oct 9 202611pm Fri, Oct 9 202612am Sat, Oct 10 20261am Sat, Oct 10 20262am Sat, Oct 10 20263am Sat, Oct 10 20264am Sat, Oct 10 20265am Sat, Oct 10 20266am Sat, Oct 10 20267am Sat, Oct 10 20268am Sat, Oct 10 20269am Sat, Oct 10 202610am Sat, Oct 10 202611am Sat, Oct 10 202612pm Sat, Oct 10 20261pm Sat, Oct 10 20262pm Sat, Oct 10 20263pm Sat, Oct 10 20264pm Sat, Oct 10 20265pm Sat, Oct 10 20266pm Sat, Oct 10 20267pm Sat, Oct 10 20268pm Sat, Oct 10 20269pm Sat, Oct 10 202610pm Sat, Oct 10 202611pm Sat, Oct 10 202612am Sun, Oct 11 20261am Sun, Oct 11 20262am Sun, Oct 11 20263am Sun, Oct 11 20264am Sun, Oct 11 20265am Sun, Oct 11 20266am Sun, Oct 11 20267am Sun, Oct 11 20268am Sun, Oct 11 20269am Sun, Oct 11 202610am Sun, Oct 11 202611am Sun, Oct 11 202612pm Sun, Oct 11 20261pm Sun, Oct 11 20262pm Sun, Oct 11 20263pm Sun, Oct 11 20264pm Sun, Oct 11 20265pm Sun, Oct 11 20266pm Sun, Oct 11 20267pm Sun, Oct 11 20268pm Sun, Oct 11 20269pm Sun, Oct 11 202610pm Sun, Oct 11 202611pm Sun, Oct 11 2026

Date	10/07												10/08
Hour (PDT)	12	13	14	15	16	17	18	19	20	21	22	23	00	01	02	03	04	05	06	07	08	09	10	11
Temperature (°F)	90	93	94	95	94	94	89	81	75	72	70	67	66	65	64	63	62	61	61	59	62	66	74	80
Dewpoint (°F)	58	58	58	59	58	58	56	54	54	54	53	53	52	52	51	50	48	48	48	47	50	52	55	56
Heat Index (°F)	89	92	93	94	93	93	88	80	75															80
Surface Wind (mph)	5	6	6	7	7	6	2	1	0	0	1	0	0	0	0	0	0	0	0	0	1	1	1	2
Wind Dir	N	N	N	N	NNW	NNW	N	N	WNW	E	W	SSW	S	N	N	N	N	N	N	N	N	N	N	N
Gust
Sky Cover (%)	1	0	0	0	0	0	1	0	1	0	2	1	6	7	8	5	7	7	10	15	12	8	6	0
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 (%)	34	31	30	30	30	30	33	40	48	52	56	60	62	62	62	62	61	62	64	64	64	59	51	44
Rain	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--
Thunder	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--
Date													10/09
Hour (PDT)	12	13	14	15	16	17	18	19	20	21	22	23	00	01	02	03	04	05	06	07	08	09	10	11
Temperature (°F)	86	88	90	91	90	90	86	78	73	70	68	66	64	64	63	61	60	60	58	58	60	64	69	74
Dewpoint (°F)	58	59	58	58	56	56	59	57	56	56	56	55	53	52	54	51	51	51	50	50	52	54	55	57
Heat Index (°F)	85	87	89	90	88	88	86	78
Surface Wind (mph)	5	5	6	6	5	2	2	2	0	0	0	0	0	0	0	0	0	0	0	0	1	1	1	3
Wind Dir	N	N	N	N	N	NNW	NNW	NNW	N	N	N	N	N	N	N	N	N	N	N	N	SW	SW	SW	W
Gust
Sky Cover (%)	0	0	0	1	1	1	1	1	1	1	1	15	15	15	16	16	16	15	15	15	25	25	25	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 (%)	39	37	35	33	32	31	40	48	56	60	65	67	66	66	72	70	70	72	74	75	74	69	62	56
Rain	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--
Thunder	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--

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