Point Forecast: Waltham MA  42.39N 71.27W (Elev. 60 m)	Last Update: 3:26 pm EDT Jun 16, 2025

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Weather Elements Fire Weather Aviation Weather Temperature (°C) Dewpoint (°C) Heat Index (°C) Surface Wind  ktmphkm/hm/s Sky Cover (%) Precipitation Potential (%) Relative Humidity (%) Rain Thunder Fog Mixing Height  x100ftx100m Trans. Wind  ktmphkm/hm/s 20ft Wind  ktmphkm/hm/s Vent Rate (x1000 mph-m) Dispersion Index Ceiling Height Visibility Thunder Potential

48-Hour Period Starting: 12am Tue, Jun 17 20251am 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 2025

Date	06/17
Hour (EDT)	00	01	02	03	04	05	06	07	08	09	10	11	12	13	14	15	16	17	18	19	20	21	22	23
Temperature (°C)	16	16	16	16	15	16	15	16	17	17	17	18	19	20	21	21	21	20	19	19	19	18	18	18
Dewpoint (°C)	14	14	14	14	14	14	14	15	15	16	16	16	17	17	17	17	17	17	16	17	16	16	17	17
Heat Index (°C)
Surface Wind (mph)	3	2	3	2	2	3	3	3	3	3	5	5	6	6	6	6	6	6	5	5	5	5	5	5
Wind Dir	SE	E	E	E	E	E	E	E	E	E	E	E	E	E	E	E	E	E	E	E	SE	SE	SE	SE
Gust
Sky Cover (%)	75	80	86	88	91	94	92	90	88	90	92	94	90	87	84	84	85	85	89	93	97	96	96	95
Precipitation Potential (%)	9	13	17	21	25	30	28	27	26	22	19	15	16	16	17	21	26	30	29	28	27	30	34	37
Relative Humidity (%)	90	93	93	93	96	93	96	96	90	97	93	87	84	81	78	81	78	81	81	84	81	87	91	93
Rain	--	--	SChc	SChc	Chc	Chc	Chc	Chc	Chc	SChc	SChc	SChc	SChc	SChc	SChc	SChc	Chc	Chc	Chc	Chc	Chc	Chc	Chc	Chc
Thunder	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--
Date	06/18
Hour (EDT)	00	01	02	03	04	05	06	07	08	09	10	11	12	13	14	15	16	17	18	19	20	21	22	23
Temperature (°C)	18	17	17	17	17	17	18	18	19	21	22	23	24	26	26	27	27	27	26	26	24	24	23	22
Dewpoint (°C)	17	17	17	17	17	17	18	18	18	19	19	19	19	20	20	20	20	20	20	20	20	20	20	20
Heat Index (°C)													24	26	26	28	28	28	27	26	24	24
Surface Wind (mph)	5	5	5	5	5	5	6	6	6	5	6	6	6	7	7	7	7	7	7	6	6	6	5	5
Wind Dir	S	S	S	S	S	S	S	S	S	SW	SW	SW	SW	SW	SW	SW	SW	SW	SW	SW	SW	SW	SW	SW
Gust
Sky Cover (%)	95	94	94	93	92	91	89	86	84	78	79	79	78	76	75	70	65	60	63	65	68	67	65	64
Precipitation Potential (%)	38	38	39	39	39	39	37	35	33	30	29	28	27	26	25	25	24	23	23	23	23	24	24	24
Relative Humidity (%)	96	98	100	100	100	100	99	97	93	89	83	79	74	71	69	67	66	67	69	72	76	80	84	87
Rain	Chc	Chc	Chc	Chc	Chc	Chc	Chc	Chc	Chc	Chc	Chc	Chc	Chc	Chc	Chc	Chc	SChc	SChc	SChc	SChc	SChc	SChc	SChc	SChc
Thunder	--	--	--	--	--	--	--	--	--	--	--	--	--	--	SChc	SChc	SChc	SChc	SChc	SChc	SChc	SChc	SChc	--

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