Seattle - Recent September Temperatures and Rainfall





The numbers here describe what the September weather in Seattle, Washington was like for every year since 2010. A series of tables gives September data by year for temperature and precipitation.

They begin with average maximum and minimum temperatures in degrees Fahrenheit and Celsius. That's followed by how many really hot days occurred each September. Then there's information on how much rain actually landed this month during recent years, as well as how often Seattle had wet weather.

The climate data come from weather measurements made at Seattle—Tacoma International Airport.

Temperature Weather iconTemperature

September temperature averages by year in Seattle
High °F Low °F Year High °C Low °C
71 54 2018 21 12
74 56 2017 23 13
70 53 2016 21 12
69 53 2015 20 11
74 56 2014 23 13
70 57 2013 21 14
73 52 2012 23 11
74 55 2011 23 13
67 54 2010 20 12
Number of days in September when the temperature in Seattle rose to at least 70 or 90 degrees Fahrenheit
Year 70 °F
21 °C
90 °F
32 °C
2018 14 0
2017 19 2
2016 12 0
2015 11 0
2014 20 1
2013 17 1
2012 20 1
2011 17 0
2010 8 0

Rainy Weather iconRain

This table gives the total precipitation that fell on Seattle during September in each year from 2010. The number of days with precipitation counts the days when rainfall amounted to 0.01 inches (0.254 millimeters) or more.

Total rainfall for September in Seattle
Days Year Inches Milli­metres
13 2018 1.1 27
8 2017 0.6 15
3 2016 1.1 27
3 2015 0.8 21
5 2014 2.2 57
9 2013 6.2 157
0 2012 0.0 1
4 2011 1.3 33
10 2010 4.8 122
Reference

Jay Lawrimore. 2016. Global Summary of the Month, Version 1.0. NOAA National Centers for Environmental Information. 

Seattle - Recent Years
Seattle - Extremes
Back to Top