Average Weather in May in Morro Bay California, United States
Daily high temperatures are around 68°F, rarely falling below 61°F or exceeding 77°F.
Daily low temperatures increase by 3°F, from 49°F to 52°F, rarely falling below 45°F or exceeding 56°F.
For reference, on August 24, the hottest day of the year, temperatures in Morro Bay typically range from 56°F to 74°F, while on January 3, the coldest day of the year, they range from 44°F to 62°F.
Average High and Low Temperature in May
The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on May. The horizontal axis is the day, 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 May
The month of May in Morro Bay experiences decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 29% to 20%.
The clearest day of the month is May 31, with clear, mostly clear, or partly cloudy conditions 80% of the time.
For reference, on February 17, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 46%, while on August 24, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 92%.
Cloud Cover Categories in May
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Morro Bay, the chance of a wet day over the course of May is decreasing, starting the month at 6% and ending it at 2%.
For reference, the year's highest daily chance of a wet day is 24% on February 20, and its lowest chance is 0% on July 27.
Probability of Precipitation in May
The average sliding 31-day rainfall during May in Morro Bay is gradually decreasing, starting the month at 0.5 inches, when it rarely exceeds 1.6 inches or falls below -0.0 inches, and ending the month at 0.1 inches, when it rarely exceeds 0.5 inches or falls below -0.0 inches.
Average Monthly Rainfall in May
Over the course of May in Morro Bay, the length of the day is increasing. From the start to the end of the month, the length of the day increases by 45 minutes, implying an average daily increase of 1 minute, 30 seconds, and weekly increase of 10 minutes, 27 seconds.
The shortest day of the month is May 1, with 13 hours, 38 minutes of daylight and the longest day is May 31, with 14 hours, 23 minutes of daylight.
Hours of Daylight and Twilight in May
The latest sunrise of the month in Morro Bay is 6:11 AM on May 1 and the earliest sunrise is 22 minutes earlier at 5:49 AM on May 31.
The earliest sunset is 7:49 PM on May 1 and the latest sunset is 23 minutes later at 8:12 PM on May 31.
Daylight saving time is observed in Morro Bay during 2018, but it neither starts nor ends during May, so the entire month is in daylight saving time.
For reference, on June 21, the longest day of the year, the Sun rises at 5:48 AM and sets 14 hours, 33 minutes later, at 8:21 PM, while on December 21, the shortest day of the year, it rises at 7:08 AM and sets 9 hours, 46 minutes later, at 4:54 PM.
Sunrise & Sunset with Twilight in May
The chance that a given day will be muggy in Morro Bay is essentially constant during May, remaining around 0% throughout.
For reference, on July 6, the muggiest day of the year, there are muggy conditions 0% of the time, while on January 1, the least muggy day of the year, there are muggy conditions 0% of the time.
Humidity Comfort Levels in May
The average hourly wind speed in Morro Bay is essentially constant during May, remaining within 0.1 miles per hour of 9.9 miles per hour throughout.
For reference, on May 24, the windiest day of the year, the daily average wind speed is 10.0 miles per hour, while on September 16, the calmest day of the year, the daily average wind speed is 7.5 miles per hour.
The highest daily average wind speed during May is 10.0 miles per hour on May 24.
Average Wind Speed in May
Wind Direction in May
Morro Bay 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 surface water temperature in Morro Bay is essentially constant during May, remaining around 55°F throughout.
Average Water Temperature in May
Temperatures in Morro Bay are sufficiently warm year round that it is not entirely meaningful to discuss the growing season in these terms. We nevertheless include the chart below as an illustration of the distribution of temperatures experienced throughout the year.
Time Spent in Various Temperature Bands and the Growing Season in May
The average accumulated growing degree days in Morro Bay are increasing during May, increasing by 260°F, from 662°F to 922°F, over the course of the month.
Growing Degree Days in May
The average daily incident shortwave solar energy in Morro Bay is gradually increasing during May, rising by 0.9 kWh, from 7.4 kWh to 8.2 kWh, over the course of the month.
Average Daily Incident Shortwave Solar Energy in May
For the purposes of this report, the geographical coordinates of Morro Bay are 35.366 deg latitude, -120.850 deg longitude, and 33 ft elevation.
The topography within 2 miles of Morro Bay contains significant variations in elevation, with a maximum elevation change of 748 feet and an average elevation above sea level of 88 feet. Within 10 miles contains significant variations in elevation (2,762 feet). Within 50 miles contains large variations in elevation (4,314 feet).
The area within 2 miles of Morro Bay is covered by water (28%), artificial surfaces (28%), grassland (19%), and herbaceous vegetation (18%), within 10 miles by water (36%) and grassland (35%), and within 50 miles by water (43%) and grassland (33%).
This report illustrates the typical weather in Morro Bay year round, 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 Morro Bay.
For each station, the records are corrected for the elevation difference between that station and Morro Bay 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 Morro Bay is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Morro Bay and a given station.
The stations contributing to this reconstruction are: San Luis Obispo County Airport (59%, 24 kilometers, southeast); Paso Robles Municipal Airport (23%, 39 kilometers, northeast); and Point Piedras Blanca (19%, 52 kilometers, northwest).
Time zones for aiports and weather stations are provided by AskGeo.com .