Seattle weather in October
In October, Seattle has daytime highs averaging 15 °C, nights around 7.9 °C, with 15 wet days. Figures are 1991–2020 climate normals.
- 15.2°C Average high
- 7.9°C Average low
- 15days Wet days
- 129mm Rainfall
- 11h Daylight
Daily temperatures through October
How October develops
Averages for the first, middle and last part of the month, from daily 1991–2020 normals. Chance of rain is the share of years in which that calendar day recorded more than 1 mm.
| Days | Avg high | Avg low | Chance of rain |
|---|---|---|---|
| 1–10 October | 17.3 °C | 9.3 °C | 38 % |
| 11–20 October | 15.3 °C | 8.2 °C | 48 % |
| 21–31 October | 13.3 °C | 6.5 °C | 54 % |
- Average highs fall from 17.3 °C early in October to 13.3 °C by the end of it.
- Rain is most likely over days 21–31 of October (54 % of days) and least likely over days 1–10 (38 %).
What to expect
| Measure | Typical October | Share of the month |
|---|---|---|
| Days above 25 °C | 0.1 of 31 | 0 % |
| Days above 30 °C | 0 of 31 | 0 % |
| Days below 0 °C | 0.3 of 31 | 1 % |
| Days with more than 1 mm rain | 15 of 31 | 47 % |
Conditions in October
| Measure | Average |
|---|---|
| Mean temperature | 11 °C |
| Record high (1991–2020) | 27 °C |
| Record low (1991–2020) | -3.0 °C |
| Relative humidity | 82 % |
| Wind speed | 15 km/h |
| Cloud cover | 66 % |
Where Seattle ranks in October
| Ranking | Position | Value |
|---|---|---|
| The coolest places in North America in October | 32nd of 50 | 15 °C |
October compared with the months around it
| Month | Avg high | Rainfall | Cloud |
|---|---|---|---|
| August | 24.9 °C | 34 mm | 45 % |
| September | 21.3 °C | 64 mm | 51 % |
| October | 15.2 °C | 129 mm | 66 % |
| November | 9.9 °C | 192 mm | 75 % |
| December | 6.9 °C | 176 mm | 77 % |
See all twelve months for Seattle
- October is the 6th warmest month here.
- It is the 8th driest month of the year.
- It ranks 6th for least cloud cover.
- Days last about 11 hours from sunrise to sunset.
- It rains on 15 of 31 days — 47 % of the month.
- Nights are about 7.2 °C cooler than the middle of the day.
- The hottest October day on record since 1991 reached 27 °C, 12 °C above the usual daytime high.
QuestionsOctober in Seattle, answered
How warm is Seattle in October?
Daily highs average 15 °C and nights fall to about 7.9 °C, a spread of 7.2 °C between afternoon and dawn. That makes October the 6th warmest month of the year here.
Does it rain much in Seattle in October?
October averages 129 mm of rain, spread over about 15 of the 31 days — 47 % of the month. Cloud cover averages 66 % of the sky.
How long are the days in October?
Seattle averages 11 hours between sunrise and sunset in October. Day length is computed from latitude and date, so it is exact rather than modelled — but it says nothing about how much of that time is sunny.
Data sources and method
- ERA5 / ERA5-Land reanalysis — Copernicus Climate Change Service (C3S), ECMWF. Copernicus Licence
- Open-Meteo — Open-Meteo.com. CC BY 4.0
- NOAA OISST v2.1 — NOAA Physical Sciences Laboratory. Public domain
- GeoNames — GeoNames.org. CC BY 4.0
- Normal period
- 1991–2020
- Dataset version
- era5-1991-2020-scores1.1
- Last processed
Measured values come from ERA5 reanalysis and are reproduced unchanged. Calculated by us: daylight hours, beach and comfort scores, monthly rankings, threshold day counts, chance of a wet day by date, ten-day averages within the month. Full formulas are on the methodology page.
Contains modified Copernicus Climate Change Service information 2026. Neither the European Commission nor ECMWF is responsible for any use that may be made of the Copernicus information or data it contains.