Baby clothes in Seattle, WA: the weather each month
In shortIn Seattle, WA, the average temperature goes from 42 °F (5.6 °C) in December to 68 °F (19.9 °C) in August, a swing of 26 °F (14.3 °C). Here the birth month does not change the clothes: a baby born on the 15th of any month needs 7 long-sleeve bodysuits by 6 months.
The typical weather in Seattle
| Month | Average | Low | High |
|---|---|---|---|
| January | 43 °F (5.9 °C) | 37 °F (2.7 °C) | 49 °F (9.2 °C) |
| February | 44 °F (6.5 °C) | 37 °F (2.7 °C) | 51 °F (10.4 °C) |
| March | 47 °F (8.4 °C) | 39 °F (4.1 °C) | 55 °F (12.7 °C) |
| April | 52 °F (10.9 °C) | 44 °F (6.4 °C) | 60 °F (15.4 °C) |
| May | 58 °F (14.4 °C) | 49 °F (9.6 °C) | 67 °F (19.2 °C) |
| June | 63 °F (17.0 °C) | 54 °F (12.2 °C) | 71 °F (21.8 °C) |
| July | 67 °F (19.7 °C) | 58 °F (14.2 °C) | 77 °F (25.2 °C) |
| August | 68 °F (19.9 °C) | 58 °F (14.5 °C) | 77 °F (25.2 °C) |
| September | 63 °F (17.1 °C) | 54 °F (12.2 °C) | 72 °F (22.1 °C) |
| October | 54 °F (12.1 °C) | 46 °F (8.0 °C) | 61 °F (16.1 °C) |
| November | 46 °F (8.0 °C) | 40 °F (4.4 °C) | 53 °F (11.7 °C) |
| December | 42 °F (5.6 °C) | 36 °F (2.3 °C) | 48 °F (8.8 °C) |
Typical weather, the average of many years; not a forecast. Climate normals: NOAA National Centers for Environmental Information, U.S. Climate Normals 1991-2020, station SEATTLE BOEING FLD, WA US (USW00024234). Palecki, M., Durre, I., Applequist, S., Arguez, A., Lawrimore, J. (2021). U.S. Climate Normals 2020: U.S. Monthly Climate Normals (1991-2020). https://doi.org/10.25921/wck8-er13. Accessed 2026-10-13.
What a baby born in Seattle needs, by birth month
The birth month does not change the clothes: a baby born on the 15th of any month needs 7 long-sleeve bodysuits, 7 short-sleeve bodysuits, and 2 fleece sleepers by 6 months.
Without heating at home, a baby born on September 15 would need 12 long-sleeve bodysuits.
Cotokim's list engine, balanced style, laundry every 2 days, for 1 baby born on the 15th of each month, with a clothes dryer and a home heated in winter (the tool's starting answers in this country). A month is cold when its average is below 64 °F (18 °C), and hot from 75 °F (24 °C) up. The exact due date changes the numbers a little; the tool does the math for your month.
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The list for your baby in Seattle
Pick the due month: the list follows the weather of each month your baby wears each size, with the reason behind every number.
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