Average Weather in May in San Jacinto California, United States
In San Jacinto, the month of May is characterized by rising daily high temperatures, with daily highs increasing by 5°F, from 79°F to 84°F over the course of the month, and rarely exceeding 95°F or dropping below 67°F.
Daily low temperatures increase by 5°F, from 53°F to 57°F, rarely falling below 46°F or exceeding 63°F.
For reference, on August 16, the hottest day of the year, temperatures in San Jacinto typically range from 67°F to 96°F, while on December 25, the coldest day of the year, they range from 41°F to 64°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 San Jacinto experiences gradually decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 28% to 21%.
The clearest day of the month is May 31, with clear, mostly clear, or partly cloudy conditions 79% of the time.
For reference, on February 21, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 47%, while on September 7, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 89%.
Cloud Cover Categories in May
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In San Jacinto, the chance of a wet day over the course of May is gradually decreasing, starting the month at 5% and ending it at 1%.
For reference, the year's highest daily chance of a wet day is 18% on February 20, and its lowest chance is 1% on June 19.
Probability of Precipitation in May
To show variation within the month and not just the monthly total, we show the rainfall accumulated over a sliding 31-day period centered around each day.
The average sliding 31-day rainfall during May in San Jacinto is essentially constant, remaining about 0.2 inches throughout, and rarely exceeding 0.8 inches.
Average Monthly Rainfall in May
Over the course of May in San Jacinto, the length of the day is increasing. From the start to the end of the month, the length of the day increases by 42 minutes, implying an average daily increase of 1 minute, 24 seconds, and weekly increase of 9 minutes, 47 seconds.
The shortest day of the month is May 1, with 13 hours, 33 minutes of daylight and the longest day is May 31, with 14 hours, 15 minutes of daylight.
Hours of Daylight and Twilight in May
The latest sunrise of the month in San Jacinto is 5:58 AM on May 1 and the earliest sunrise is 20 minutes earlier at 5:38 AM on May 31.
The earliest sunset is 7:31 PM on May 1 and the latest sunset is 22 minutes later at 7:53 PM on May 31.
Daylight saving time is observed in San Jacinto during 2017, 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 5:37 AM and sets 14 hours, 24 minutes later, at 8:01 PM, while on December 21, the shortest day of the year, it rises at 6:48 AM and sets 9 hours, 54 minutes later, at 4:43 PM.
Sunrise & Sunset with Twilight in May
The chance that a given day will be muggy in San Jacinto is essentially constant during May, remaining around 0% throughout.
For reference, on August 8, the muggiest day of the year, there are muggy conditions 2% of the time, while on November 3, 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 San Jacinto is essentially constant during May, remaining within 0.2 miles per hour of 6.6 miles per hour throughout.
For reference, on April 26, the windiest day of the year, the daily average wind speed is 6.8 miles per hour, while on September 6, the calmest day of the year, the daily average wind speed is 5.0 miles per hour.
Average Wind Speed in May
Wind Direction in May
San Jacinto 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 San Jacinto is gradually increasing during May, rising by 2°F, from 62°F to 64°F, over the course of the month.
Average Water Temperature in May
The growing season in San Jacinto typically lasts for 11 months (347 days), from around January 13 to around December 27, rarely starting after March 2, or ending before November 24.
The month of May in San Jacinto is reliably fully within the growing season.
Time Spent in Various Temperature Bands and the Growing Season in May
The average accumulated growing degree days in San Jacinto is rapidly increasing during May, increasing by 502°F, from 955°F to 1,457°F, over the course of the month.
Growing Degree Days in May
The average daily incident shortwave solar energy in San Jacinto is gradually increasing during May, rising by 0.7 kWh, from 7.8 kWh to 8.4 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 San Jacinto are 33.784 deg latitude, -116.959 deg longitude, and 1,575 ft elevation.
The topography within 2 miles of San Jacinto contains only modest variations in elevation, with a maximum elevation change of 318 feet and an average elevation above sea level of 1,563 feet. Within 10 miles contains only modest variations in elevation (4,350 feet). Within 50 miles also contains extreme variations in elevation (11,660 feet).
The area within 2 miles of San Jacinto is covered by shrubs (87%) and grassland (12%), within 10 miles by shrubs (70%) and grassland (20%), and within 50 miles by shrubs (70%).
This report illustrates the typical weather in San Jacinto 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 San Jacinto.
For each station, the records are corrected for the elevation difference between that station and San Jacinto 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 San Jacinto is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between San Jacinto and a given station.
The stations contributing to this reconstruction are: March Air Reserve Base (61%, 30 kilometers, northwest); Palm Springs International Airport (24%, 42 kilometers, east); and Oceanside, Camp Pendleton, Marine Corps Air Station (14%, 65 kilometers, southwest).
Time zones for aiports and weather stations are provided by AskGeo.com .