Average Weather in Mukilteo Washington, United States
In Mukilteo, the summers are short, comfortable, dry, and partly cloudy and the winters are very cold, wet, and mostly cloudy. Over the course of the year, the temperature typically varies from 37°F to 77°F and is rarely below 27°F or above 86°F.
Based on the tourism score, the best time of year to visit Mukilteo for warm-weather activities is from mid July to late August.
The warm season lasts for 2.8 months, from June 23 to September 16, with an average daily high temperature above 70°F. The hottest day of the year is August 3, with an average high of 77°F and low of 57°F.
The cool season lasts for 3.3 months, from November 14 to February 24, with an average daily high temperature below 52°F. The coldest day of the year is December 23, with an average low of 37°F and high of 45°F.
Average High and Low Temperature
The figure below shows you a compact characterization of the entire year of hourly average temperatures. The horizontal axis is the day of the year, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.
Average Hourly Temperature
In Mukilteo, the average percentage of the sky covered by clouds experiences significant seasonal variation over the course of the year.
The clearer part of the year in Mukilteo begins around June 15 and lasts for 3.8 months, ending around October 7. On August 3, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 74% of the time, and overcast or mostly cloudy 26% of the time.
The cloudier part of the year begins around October 7 and lasts for 8.2 months, ending around June 15. On January 19, the cloudiest day of the year, the sky is overcast or mostly cloudy 72% of the time, and clear, mostly clear, or partly cloudy 28% of the time.
Cloud Cover Categories
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Mukilteo varies very significantly throughout the year.
The wetter season lasts 6.6 months, from October 11 to April 29, with a greater than 34% chance of a given day being a wet day. The chance of a wet day peaks at 59% on November 18.
The drier season lasts 5.4 months, from April 29 to October 11. The smallest chance of a wet day is 9% on August 1.
Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 58% on November 18.
Daily Chance of Precipitation
To show variation within the months and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day of the year. Mukilteo experiences extreme seasonal variation in monthly rainfall.
Rain falls throughout the year in Mukilteo. The most rain falls during the 31 days centered around November 21, with an average total accumulation of 8.0 inches.
The least rain falls around July 30, with an average total accumulation of 0.7 inches.
Average Monthly Rainfall
The sliding 31-day liquid-equivalent quantity of snowfall in Mukilteo does not vary significantly over the course of the year, staying within 0.1 inches of 0.1 inches throughout.
Average Liquid-Equivalent Monthly Snowfall
The length of the day in Mukilteo varies extremely over the course of the year. In 2019, the shortest day is December 21, with 8 hours, 23 minutes of daylight; the longest day is June 21, with 16 hours, 2 minutes of daylight.
Hours of Daylight and Twilight
The earliest sunrise is at 5:09 AM on June 16, and the latest sunrise is 2 hours, 50 minutes later at 7:58 AM on January 1. The earliest sunset is at 4:16 PM on December 10, and the latest sunset is 4 hours, 57 minutes later at 9:12 PM on June 25.
Daylight saving time (DST) is observed in Mukilteo during 2019, starting in the spring on March 10, lasting 7.8 months, and ending in the fall on November 3.
Sunrise & Sunset with Twilight and Daylight Saving Time
The perceived humidity level in Mukilteo, as measured by the percentage of time in which the humidity comfort level is muggy, oppressive, or miserable, does not vary significantly over the course of the year, remaining a virtually constant 0% throughout.
Humidity Comfort Levels
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The average hourly wind speed in Mukilteo experiences mild seasonal variation over the course of the year.
The windier part of the year lasts for 6.1 months, from October 17 to April 21, with average wind speeds of more than 3.8 miles per hour. The windiest day of the year is December 4, with an average hourly wind speed of 5.1 miles per hour.
The calmer time of year lasts for 5.9 months, from April 21 to October 17. The calmest day of the year is August 2, with an average hourly wind speed of 2.5 miles per hour.
Average Wind Speed
The predominant average hourly wind direction in Mukilteo varies throughout the year.
The wind is most often from the west for 1.2 months, from May 15 to June 22, with a peak percentage of 35% on June 8. The wind is most often from the north for 3.1 months, from June 22 to September 26, with a peak percentage of 49% on July 30. The wind is most often from the south for 7.6 months, from September 26 to May 15, with a peak percentage of 45% on January 1.
Mukilteo is located near a large body of water (e.g., ocean, sea, or large lake). This section reports on the wide-area average surface temperature of that water.
The average water temperature experiences some seasonal variation over the course of the year.
The time of year with warmer water lasts for 3.0 months, from June 24 to September 25, with an average temperature above 53°F. The day of the year with the warmest water is August 8, with an average temperature of 55°F.
The time of year with cooler water lasts for 4.0 months, from December 9 to April 9, with an average temperature below 48°F. The day of the year with the coolest water is February 11, with an average temperature of 46°F.
Average Water Temperature
Best Time of Year to Visit
To characterize how pleasant the weather is in Mukilteo throughout the year, we compute two travel scores.
The tourism score favors clear, rainless days with perceived temperatures between 65°F and 80°F. Based on this score, the best time of year to visit Mukilteo for general outdoor tourist activities is from mid July to late August, with a peak score in the first week of August.
The beach/pool score favors clear, rainless days with perceived temperatures between 75°F and 90°F. Based on this score, the best time of year to visit Mukilteo for hot-weather activities is from mid July to mid August, with a peak score in the first week of August.
For each hour between 8:00 AM and 9:00 PM of each day in the analysis period (1980 to 2016), independent scores are computed for perceived temperature, cloud cover, and total precipitation. Those scores are combined into a single hourly composite score, which is then aggregated into days, averaged over all the years in the analysis period, and smoothed.
Our cloud cover score is 10 for fully clear skies, falling linearly to 9 for mostly clear skies, and to 1 for fully overcast skies.
Our precipitation score, which is based on the three-hour precipitation centered on the hour in question, is 10 for no precipitation, falling linearly to 9 for trace precipitation, and to 0 for 0.04 inches of precipitation or more.
Our tourism temperature score is 0 for perceived temperatures below 50°F, rising linearly to 9 for 65°F, to 10 for 75°F, falling linearly to 9 for 80°F, and to 1 for 90°F or hotter.
Our beach/pool temperature score is 0 for perceived temperatures below 65°F, rising linearly to 9 for 75°F, to 10 for 82°F, falling linearly to 9 for 90°F, and to 1 for 100°F or hotter.
The growing season in Mukilteo typically lasts for 8.9 months (270 days), from around February 24 to around November 21, rarely starting before January 20 or after March 19, and rarely ending before October 30 or after December 18.
Time Spent in Various Temperature Bands and the Growing Season
Based on growing degree days alone, the first spring blooms in Mukilteo should appear around April 11, only rarely appearing before March 16 or after May 6.
Growing Degree Days
The average daily incident shortwave solar energy experiences extreme seasonal variation over the course of the year.
The brighter period of the year lasts for 3.3 months, from May 11 to August 22, with an average daily incident shortwave energy per square meter above 5.5 kWh. The brightest day of the year is July 21, with an average of 6.6 kWh.
The darker period of the year lasts for 3.8 months, from October 25 to February 17, with an average daily incident shortwave energy per square meter below 2.0 kWh. The darkest day of the year is December 25, with an average of 0.9 kWh.
Average Daily Incident Shortwave Solar Energy
For the purposes of this report, the geographical coordinates of Mukilteo are 47.945 deg latitude, -122.305 deg longitude, and 0 ft elevation.
The topography within 2 miles of Mukilteo contains significant variations in elevation, with a maximum elevation change of 597 feet and an average elevation above sea level of 150 feet. Within 10 miles also contains significant variations in elevation (640 feet). Within 50 miles contains significant variations in elevation (7,720 feet).
The area within 2 miles of Mukilteo is covered by water (69%), artificial surfaces (17%), and herbaceous vegetation (10%), within 10 miles by water (38%) and artificial surfaces (28%), and within 50 miles by trees (50%) and water (21%).
This report illustrates the typical weather in Mukilteo, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.
Temperature and Dew Point
There are 3 weather stations near enough to contribute to our estimation of the temperature and dew point in Mukilteo.
For each station, the records are corrected for the elevation difference between that station and Mukilteo according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.
The estimated value at Mukilteo is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Mukilteo and a given station.
The stations contributing to this reconstruction are: Snohomish County Airport (Paine Field) (53%, 4.5 kilometers, southeast); Arlington Municipal Airport (32%, 26 kilometers, northeast); and AJ Eisenberg Airport (15%, 43 kilometers, northwest).
Time zones for aiports and weather stations are provided by AskGeo.com .