Point Forecast: Waltham MA  42.38N 71.24W (Elev. 30 m)	Last Update: 9:50 pm EDT Sep 23, 2024

[hide menu]

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 Haines Index Lightning Activity Level 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: 10pm Mon, Sep 23 202411pm Mon, Sep 23 202412am Tue, Sep 24 20241am Tue, Sep 24 20242am Tue, Sep 24 20243am Tue, Sep 24 20244am Tue, Sep 24 20245am Tue, Sep 24 20246am Tue, Sep 24 20247am Tue, Sep 24 20248am Tue, Sep 24 20249am Tue, Sep 24 202410am Tue, Sep 24 202411am Tue, Sep 24 202412pm Tue, Sep 24 20241pm Tue, Sep 24 20242pm Tue, Sep 24 20243pm Tue, Sep 24 20244pm Tue, Sep 24 20245pm Tue, Sep 24 20246pm Tue, Sep 24 20247pm Tue, Sep 24 20248pm Tue, Sep 24 20249pm Tue, Sep 24 202410pm Tue, Sep 24 202411pm Tue, Sep 24 202412am Wed, Sep 25 20241am Wed, Sep 25 20242am Wed, Sep 25 20243am Wed, Sep 25 20244am Wed, Sep 25 20245am Wed, Sep 25 20246am Wed, Sep 25 20247am Wed, Sep 25 20248am Wed, Sep 25 20249am Wed, Sep 25 202410am Wed, Sep 25 202411am Wed, Sep 25 202412pm Wed, Sep 25 20241pm Wed, Sep 25 20242pm Wed, Sep 25 20243pm Wed, Sep 25 20244pm Wed, Sep 25 20245pm Wed, Sep 25 20246pm Wed, Sep 25 20247pm Wed, Sep 25 20248pm Wed, Sep 25 20249pm Wed, Sep 25 202410pm Wed, Sep 25 202411pm Wed, Sep 25 202412am Thu, Sep 26 20241am Thu, Sep 26 20242am Thu, Sep 26 20243am Thu, Sep 26 20244am Thu, Sep 26 20245am Thu, Sep 26 20246am Thu, Sep 26 20247am Thu, Sep 26 20248am Thu, Sep 26 20249am Thu, Sep 26 202410am Thu, Sep 26 202411am Thu, Sep 26 202412pm Thu, Sep 26 20241pm Thu, Sep 26 20242pm Thu, Sep 26 20243pm Thu, Sep 26 20244pm Thu, Sep 26 20245pm Thu, Sep 26 20246pm Thu, Sep 26 20247pm Thu, Sep 26 20248pm Thu, Sep 26 20249pm Thu, Sep 26 202410pm Thu, Sep 26 202411pm Thu, Sep 26 202412am Fri, Sep 27 20241am Fri, Sep 27 20242am Fri, Sep 27 20243am Fri, Sep 27 20244am Fri, Sep 27 20245am Fri, Sep 27 20246am Fri, Sep 27 20247am Fri, Sep 27 20248am Fri, Sep 27 20249am Fri, Sep 27 202410am Fri, Sep 27 202411am Fri, Sep 27 202412pm Fri, Sep 27 20241pm Fri, Sep 27 20242pm Fri, Sep 27 20243pm Fri, Sep 27 20244pm Fri, Sep 27 20245pm Fri, Sep 27 20246pm Fri, Sep 27 20247pm Fri, Sep 27 20248pm Fri, Sep 27 20249pm Fri, Sep 27 202410pm Fri, Sep 27 202411pm Fri, Sep 27 202412am Sat, Sep 28 20241am Sat, Sep 28 20242am Sat, Sep 28 20243am Sat, Sep 28 20244am Sat, Sep 28 20245am Sat, Sep 28 20246am Sat, Sep 28 20247am Sat, Sep 28 20248am Sat, Sep 28 20249am Sat, Sep 28 2024

Date	09/23		09/24
Hour (EDT)	22	23	00	01	02	03	04	05	06	07	08	09	10	11	12	13	14	15	16	17	18	19	20	21
Temperature (°C)	14	13	13	13	12	12	12	12	12	12	12	14	16	17	18	18	18	18	18	17	17	16	14	14
Dewpoint (°C)	12	12	12	11	11	11	11	11	11	11	11	12	12	12	12	12	12	12	12	12	12	12	12	12
Heat Index (°C)
Surface Wind (mph)	5	3	3	5	5	5	5	3	5	6	5	6	7	7	9	9	10	9	9	9	8	7	7	6
Wind Dir	NE	NE	N	N	N	N	N	N	N	N	NE	NE	NE	NE	E	E	E	E	E	E	E	E	E	NE
Gust
Sky Cover (%)	71	80	73	72	66	65	65	62	57	55	71	71	72	73	73	72	72	70	68	66	66	67	68	68
Precipitation Potential (%)	1	1	1	2	1	0	0	1	0	0	9	10	11	12	10	7	5	7	9	12	11	11	11	10
Relative Humidity (%)	86	90	90	90	93	93	90	90	93	96	93	83	75	72	70	67	67	67	67	70	72	78	83	86
Rain	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--
Thunder	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--
Date			09/25
Hour (EDT)	22	23	00	01	02	03	04	05	06	07	08	09	10	11	12	13	14	15	16	17	18	19	20	21
Temperature (°C)	13	13	13	13	13	13	13	13	13	14	13	14	16	17	18	18	18	18	18	18	17	16	16	15
Dewpoint (°C)	12	12	12	12	12	12	12	12	12	12	12	13	13	14	14	14	13	13	14	14	13	13	13	13
Heat Index (°C)
Surface Wind (mph)	5	3	3	3	3	3	3	3	3	5	5	5	6	6	6	7	7	7	8	8	7	6	5	3
Wind Dir	NE	NE	NE	NE	NE	NE	NE	NE	NE	NE	NE	E	E	E	E	E	E	E	E	E	E	E	E	E
Gust
Sky Cover (%)	69	69	70	72	73	77	80	84	83	83	82	81	81	80	83	85	88	86	85	83	85	87	89	88
Precipitation Potential (%)	10	9	8	8	7	8	9	10	11	12	5	4	3	3	3	4	4	4	5	5	7	11	13	16
Relative Humidity (%)	90	90	90	90	90	90	90	90	90	90	90	91	87	84	79	77	73	72	76	78	78	83	86	89
Rain	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	SChc
Thunder	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--

English Units Forecast Discussion 7-Day Forecast Hourly Weather Graph Graphical Hazardous Weather Outlook Regional Weather Conditions Past Weather Information Interactive Forecast Map Weather Story Home