Point Forecast: Napa CA  38.29N 122.29W (Elev. 20 ft)	Last Update: 2:01 am PDT Jul 17, 2026

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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: 8am Fri, Jul 17 20269am Fri, Jul 17 202610am Fri, Jul 17 202611am Fri, Jul 17 202612pm Fri, Jul 17 20261pm Fri, Jul 17 20262pm Fri, Jul 17 20263pm Fri, Jul 17 20264pm Fri, Jul 17 20265pm Fri, Jul 17 20266pm Fri, Jul 17 20267pm Fri, Jul 17 20268pm Fri, Jul 17 20269pm Fri, Jul 17 202610pm Fri, Jul 17 202611pm Fri, Jul 17 202612am Sat, Jul 18 20261am Sat, Jul 18 20262am Sat, Jul 18 20263am Sat, Jul 18 20264am Sat, Jul 18 20265am Sat, Jul 18 20266am Sat, Jul 18 20267am Sat, Jul 18 20268am Sat, Jul 18 20269am Sat, Jul 18 202610am Sat, Jul 18 202611am Sat, Jul 18 202612pm Sat, Jul 18 20261pm Sat, Jul 18 20262pm Sat, Jul 18 20263pm Sat, Jul 18 20264pm Sat, Jul 18 20265pm Sat, Jul 18 20266pm Sat, Jul 18 20267pm Sat, Jul 18 20268pm Sat, Jul 18 20269pm Sat, Jul 18 202610pm Sat, Jul 18 202611pm Sat, Jul 18 202612am Sun, Jul 19 20261am Sun, Jul 19 20262am Sun, Jul 19 20263am Sun, Jul 19 20264am Sun, Jul 19 20265am Sun, Jul 19 20266am Sun, Jul 19 20267am Sun, Jul 19 20268am Sun, Jul 19 20269am Sun, Jul 19 202610am Sun, Jul 19 202611am Sun, Jul 19 202612pm Sun, Jul 19 20261pm Sun, Jul 19 20262pm Sun, Jul 19 20263pm Sun, Jul 19 20264pm Sun, Jul 19 20265pm Sun, Jul 19 20266pm Sun, Jul 19 20267pm Sun, Jul 19 20268pm Sun, Jul 19 20269pm Sun, Jul 19 202610pm Sun, Jul 19 202611pm Sun, Jul 19 202612am Mon, Jul 20 20261am Mon, Jul 20 20262am Mon, Jul 20 20263am Mon, Jul 20 20264am Mon, Jul 20 20265am Mon, Jul 20 20266am Mon, Jul 20 20267am Mon, Jul 20 20268am Mon, Jul 20 20269am Mon, Jul 20 202610am Mon, Jul 20 202611am Mon, Jul 20 202612pm Mon, Jul 20 20261pm Mon, Jul 20 20262pm Mon, Jul 20 20263pm Mon, Jul 20 20264pm Mon, Jul 20 20265pm Mon, Jul 20 20266pm Mon, Jul 20 20267pm Mon, Jul 20 20268pm Mon, Jul 20 20269pm Mon, Jul 20 202610pm Mon, Jul 20 202611pm Mon, Jul 20 202612am Tue, Jul 21 20261am Tue, Jul 21 20262am Tue, Jul 21 20263am Tue, Jul 21 20264am Tue, Jul 21 20265am Tue, Jul 21 20266am Tue, Jul 21 20267am Tue, Jul 21 20268am Tue, Jul 21 20269am Tue, Jul 21 202610am Tue, Jul 21 202611am Tue, Jul 21 202612pm Tue, Jul 21 20261pm Tue, Jul 21 20262pm Tue, Jul 21 20263pm Tue, Jul 21 20264pm Tue, Jul 21 20265pm Tue, Jul 21 20266pm Tue, Jul 21 20267pm Tue, Jul 21 2026

Date	07/17																07/18
Hour (PDT)	08	09	10	11	12	13	14	15	16	17	18	19	20	21	22	23	00	01	02	03	04	05	06	07
Temperature (°F)	56	58	62	66	70	75	77	79	79	78	76	74	68	63	60	58	57	56	56	54	54	54	53	54
Dewpoint (°F)	52	52	53	54	54	56	56	57	57	56	56	56	55	54	54	54	54	54	53	53	53	52	52	52
Heat Index (°F)						75	77	79	80	78	76
Surface Wind (mph)	2	2	5	6	7	8	8	9	9	9	8	7	7	6	5	5	3	2	2	2	2	2	2	2
Wind Dir	SW	SSW	SSW	SSW	SSW	SSW	SSW	SSW	SSW	SW	SW	SW	SSW	SSW	S	SSW	SSW	SSW	SSW	SSW	SSW	SW	SW	SW
Gust
Sky Cover (%)	55	56	46	16	8	4	1	1	1	1	2	2	1	7	27	38	47	54	66	64	70	80	80	80
Precipitation Potential (%)	0	0	0	0	0	0	0	0	0	0	0	0	0	1	1	1	1	1	1	2	2	0	0	0
Relative Humidity (%)	89	80	72	63	57	52	48	47	47	47	50	55	63	72	80	86	88	91	92	94	94	95	95	95
Rain	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--
Thunder	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--
Date																	07/19
Hour (PDT)	08	09	10	11	12	13	14	15	16	17	18	19	20	21	22	23	00	01	02	03	04	05	06	07
Temperature (°F)	55	57	61	65	70	75	77	79	80	79	77	73	68	65	61	59	57	56	56	55	54	54	54	54
Dewpoint (°F)	54	53	55	55	56	57	57	57	58	57	57	56	55	55	55	54	54	53	53	52	52	52	52	52
Heat Index (°F)						75	77	80	80	79	77
Surface Wind (mph)	2	2	2	6	6	6	8	8	8	8	8	8	6	6	6	3	3	3	2	2	2	2	2	2
Wind Dir	SW	SW	SW	SW	SW	SW	SW	SW	SW	SW	SW	SW	SW	SW	SW	WSW	WSW	WSW	WSW	WSW	WSW	WSW	WSW	WSW
Gust
Sky Cover (%)	74	74	74	20	20	20	1	1	1	2	2	2	4	4	4	24	24	24	71	71	71	84	84	84
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 (%)	95	87	79	69	61	54	49	47	47	47	50	55	63	71	79	86	89	90	90	91	92	92	93	93
Rain	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--
Thunder	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--

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