Point Forecast: Chelmsford MA  42.58N 71.38W (Elev. 180 ft)	Last Update: 9:50 am EDT May 4, 2024

[hide menu]

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

48-Hour Period Starting: 10am Sat, May 4 202411am Sat, May 4 202412pm Sat, May 4 20241pm Sat, May 4 20242pm Sat, May 4 20243pm Sat, May 4 20244pm Sat, May 4 20245pm Sat, May 4 20246pm Sat, May 4 20247pm Sat, May 4 20248pm Sat, May 4 20249pm Sat, May 4 202410pm Sat, May 4 202411pm Sat, May 4 202412am Sun, May 5 20241am Sun, May 5 20242am Sun, May 5 20243am Sun, May 5 20244am Sun, May 5 20245am Sun, May 5 20246am Sun, May 5 20247am Sun, May 5 20248am Sun, May 5 20249am Sun, May 5 202410am Sun, May 5 202411am Sun, May 5 202412pm Sun, May 5 20241pm Sun, May 5 20242pm Sun, May 5 20243pm Sun, May 5 20244pm Sun, May 5 20245pm Sun, May 5 20246pm Sun, May 5 20247pm Sun, May 5 20248pm Sun, May 5 20249pm Sun, May 5 202410pm Sun, May 5 202411pm Sun, May 5 202412am Mon, May 6 20241am Mon, May 6 20242am Mon, May 6 20243am Mon, May 6 20244am Mon, May 6 20245am Mon, May 6 20246am Mon, May 6 20247am Mon, May 6 20248am Mon, May 6 20249am Mon, May 6 202410am Mon, May 6 202411am Mon, May 6 202412pm Mon, May 6 20241pm Mon, May 6 20242pm Mon, May 6 20243pm Mon, May 6 20244pm Mon, May 6 20245pm Mon, May 6 20246pm Mon, May 6 20247pm Mon, May 6 20248pm Mon, May 6 20249pm Mon, May 6 202410pm Mon, May 6 202411pm Mon, May 6 202412am Tue, May 7 20241am Tue, May 7 20242am Tue, May 7 20243am Tue, May 7 20244am Tue, May 7 20245am Tue, May 7 20246am Tue, May 7 20247am Tue, May 7 20248am Tue, May 7 20249am Tue, May 7 202410am Tue, May 7 202411am Tue, May 7 202412pm Tue, May 7 20241pm Tue, May 7 20242pm Tue, May 7 20243pm Tue, May 7 20244pm Tue, May 7 20245pm Tue, May 7 20246pm Tue, May 7 20247pm Tue, May 7 20248pm Tue, May 7 20249pm Tue, May 7 202410pm Tue, May 7 202411pm Tue, May 7 202412am Wed, May 8 20241am Wed, May 8 20242am Wed, May 8 20243am Wed, May 8 20244am Wed, May 8 20245am Wed, May 8 20246am Wed, May 8 20247am Wed, May 8 20248am Wed, May 8 20249am Wed, May 8 202410am Wed, May 8 202411am Wed, May 8 202412pm Wed, May 8 20241pm Wed, May 8 20242pm Wed, May 8 20243pm Wed, May 8 20244pm Wed, May 8 20245pm Wed, May 8 20246pm Wed, May 8 20247pm Wed, May 8 20248pm Wed, May 8 20249pm Wed, May 8 2024

Date	05/04														05/05
Hour (EDT)	10	11	12	13	14	15	16	17	18	19	20	21	22	23	00	01	02	03	04	05	06	07	08	09
Temperature (°F)	56	58	59	60	61	61	61	60	57	54	51	49	47	47	46	46	46	46	45	45	45	46	48	50
Dewpoint (°F)	44	44	45	44	44	44	43	43	42	41	42	42	43	43	43	43	43	43	43	43	43	43	44	44
Heat Index (°F)
Surface Wind (mph)	7	7	8	8	8	8	8	8	8	7	6	5	5	3	3	3	3	5	5	5	5	5	5	6
Wind Dir	E	E	E	E	E	E	E	E	E	E	E	E	E	E	E	E	E	E	E	E	E	SE	SE	SE
Gust
Sky Cover (%)	74	79	85	78	70	71	78	72	68	79	78	82	86	90	85	90	91	93	95	96	95	93	91	87
Precipitation Potential (%)	0	0	0	0	0	0	0	0	0	0	0	0	0	3	0	5	3	0	0	0	1	2	3	8
Relative Humidity (%)	64	59	60	55	53	53	51	53	57	61	71	77	86	86	89	89	89	89	93	93	93	89	86	80
Rain	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--
Thunder	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--
Date															05/06
Hour (EDT)	10	11	12	13	14	15	16	17	18	19	20	21	22	23	00	01	02	03	04	05	06	07	08	09
Temperature (°F)	51	53	54	55	56	56	56	55	54	53	52	51	50	49	49	49	49	49	49	50	51	52	54	56
Dewpoint (°F)	44	44	45	45	44	44	45	45	45	44	44	45	46	47	47	48	48	49	49	50	51	52	53	54
Heat Index (°F)
Surface Wind (mph)	7	7	8	7	7	8	9	9	9	9	9	10	10	10	10	9	9	8	8	7	7	7	7	8
Wind Dir	SE	SE	SE	SE	SE	S	S	S	S	S	S	S	S	S	S	S	S	S	S	S	S	SW	SW	SW
Gust
Sky Cover (%)	82	77	81	85	89	93	96	100	98	96	94	95	95	96	95	95	94	94	94	94	90	86	81	78
Precipitation Potential (%)	14	19	24	28	33	36	40	43	55	67	79	82	83	83	77	71	65	60	54	48	45	42	39	36
Relative Humidity (%)	77	71	71	69	64	64	66	69	71	71	74	79	86	92	93	97	96	99	98	100	100	99	96	92
Rain	--	SChc	SChc	Chc	Chc	Chc	Chc	Chc	Lkly	Lkly	Ocnl	Ocnl	Ocnl	Ocnl	Ocnl	Lkly	Lkly	Lkly	Chc	Chc	Chc	Chc	Chc	Chc
Thunder	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--

International System of Units Forecast Discussion 7-Day Forecast Hourly Weather Graph Hazardous Weather Regional Weather Conditions Past Weather Information Interactive Forecast Map Regional Weather Story Home