Seatac, Washington Weather Forecast

Local

Seatac, WA, US

47.44846, -122.29217

Normals for September

	Temp ( °F °C )			Precip ( " mm )		Degree Days
	Min	Max	Avg	MTD	YTD	Heating	Cooling
1	56 13	75 24	66 19	0.04 undefined	21.83 undefined	1.5	2.1
2	56 13	75 24	66 19	0.08 undefined	21.87 undefined	1.5	2
3	56 13	75 24	65 19	0.12 undefined	21.91 undefined	1.6	1.9
4	56 13	75 24	65 18	0.17 undefined	21.96 undefined	1.7	1.9
5	55 13	75 24	65 18	0.21 undefined	22 undefined	1.8	1.8
6	55 13	74 24	65 18	0.26 undefined	22.05 undefined	1.9	1.7
7	55 13	74 23	65 18	0.3 undefined	22.09 undefined	2	1.6
8	55 13	74 23	65 18	0.35 undefined	22.14 undefined	2.1	1.6
9	55 13	74 23	64 18	0.39 undefined	22.18 undefined	2.2	1.5
10	55 13	74 23	64 18	0.44 undefined	22.23 undefined	2.3	1.4
11	55 13	73 23	64 18	0.49 undefined	22.28 undefined	2.4	1.3
12	54 12	73 23	64 18	0.54 undefined	22.33 undefined	2.5	1.2
13	54 12	73 23	63 17	0.59 undefined	22.38 undefined	2.7	1.1
14	54 12	72 22	63 17	0.64 undefined	22.43 undefined	2.8	1
15	54 12	72 22	63 17	0.69 undefined	22.48 undefined	3	0.9
16	54 12	72 22	63 17	0.74 undefined	22.53 undefined	3.2	0.9
17	54 12	72 22	63 17	0.8 undefined	22.59 undefined	3.3	0.8
18	53 12	71 22	62 17	0.85 undefined	22.64 undefined	3.5	0.8
19	53 12	71 22	62 17	0.91 undefined	22.7 undefined	3.7	0.7
20	53 12	71 21	62 17	0.96 undefined	22.75 undefined	3.9	0.6
21	53 12	70 21	61 16	1.02 undefined	22.81 undefined	4.2	0.6
22	53 11	70 21	61 16	1.07 undefined	22.86 undefined	4.4	0.5
23	52 11	69 21	61 16	1.13 undefined	22.92 undefined	4.6	0.5
24	52 11	69 21	61 16	1.19 undefined	22.98 undefined	4.9	0.4
25	52 11	69 20	60 16	1.25 undefined	23.04 undefined	5.1	0.4
26	52 11	68 20	60 16	1.32 undefined	23.11 undefined	5.4	0.3
27	51 11	68 20	60 15	1.39 undefined	23.18 undefined	5.7	0.3
28	51 11	68 20	59 15	1.46 undefined	23.25 undefined	5.9	0.2
29	51 11	67 20	59 15	1.53 undefined	23.32 undefined	6.2	0.2
30	51 10	67 19	59 15	1.61 undefined	23.4 undefined	6.5	0.2