Average Weather at Oceanside Harbor California, United States
At Oceanside Harbor, the summers are warm, arid, and clear and the winters are long, cool, and partly cloudy. Over the course of the year, the temperature typically varies from 49°F to 77°F and is rarely below 43°F or above 82°F.
Based on the tourism score, the best time of year to visit Oceanside Harbor for warm-weather activities is from early June to early October.
The warm season lasts for 3.0 months, from July 3 to October 1, with an average daily high temperature above 74°F. The hottest day of the year is August 23, with an average high of 77°F and low of 64°F.
The cool season lasts for 4.1 months, from December 2 to April 6, with an average daily high temperature below 66°F. The coldest day of the year is December 25, with an average low of 49°F and high of 64°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
At Oceanside Harbor, 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 at Oceanside Harbor begins around April 26 and lasts for 6.2 months, ending around November 3. On September 7, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 91% of the time, and overcast or mostly cloudy 9% of the time.
The cloudier part of the year begins around November 3 and lasts for 5.8 months, ending around April 26. On February 20, the cloudiest day of the year, the sky is overcast or mostly cloudy 43% of the time, and clear, mostly clear, or partly cloudy 57% of the time.
Cloud Cover Categories
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days at Oceanside Harbor varies throughout the year.
The wetter season lasts 4.6 months, from November 18 to April 6, with a greater than 11% chance of a given day being a wet day. The chance of a wet day peaks at 21% on February 21.
The drier season lasts 7.4 months, from April 6 to November 18. The smallest chance of a wet day is 0% on June 25.
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 21% on February 21.
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. Oceanside Harbor experiences significant seasonal variation in monthly rainfall.
The rainy period of the year lasts for 6.1 months, from October 21 to April 24, with a sliding 31-day rainfall of at least 0.5 inches. The most rain falls during the 31 days centered around February 20, with an average total accumulation of 2.8 inches.
The rainless period of the year lasts for 5.9 months, from April 24 to October 21. The least rain falls around June 28, with an average total accumulation of 0.0 inches.
Average Monthly Rainfall
The length of the day at Oceanside Harbor varies significantly over the course of the year. In 2017, the shortest day is December 21, with 9 hours, 57 minutes of daylight; the longest day is June 20, with 14 hours, 21 minutes of daylight.
Hours of Daylight and Twilight
The earliest sunrise is at 5:39 AM on June 12, and the latest sunrise is 1 hour, 31 minutes later at 7:10 AM on November 4. The earliest sunset is at 4:42 PM on December 4, and the latest sunset is 3 hours, 21 minutes later at 8:02 PM on June 29.
Daylight saving time (DST) is observed at Oceanside Harbor during 2017, starting in the spring on March 12, lasting 7.8 months, and ending in the fall on November 5.
Sunrise & Sunset with Twilight and Daylight Saving Time
Oceanside Harbor experiences some seasonal variation in the perceived humidity.
The muggier period of the year lasts for 3.5 months, from June 24 to October 9, during which time the comfort level is muggy, oppressive, or miserable at least 6% of the time. The muggiest day of the year is August 22, with muggy conditions 24% of the time.
The least muggy day of the year is January 31, when muggy conditions are essentially unheard of.
Humidity Comfort Levels
The average hourly wind speed at Oceanside Harbor experiences mild seasonal variation over the course of the year.
The windier part of the year lasts for 6.7 months, from November 12 to June 2, with average wind speeds of more than 6.2 miles per hour. The windiest day of the year is February 19, with an average hourly wind speed of 7.2 miles per hour.
The calmer time of year lasts for 5.3 months, from June 2 to November 12. The calmest day of the year is August 15, with an average hourly wind speed of 5.2 miles per hour.
Average Wind Speed
The predominant average hourly wind direction at Oceanside Harbor varies throughout the year.
The wind is most often from the west for 10 months, from January 24 to December 6, with a peak percentage of 77% on May 24. The wind is most often from the east for 1.6 months, from December 6 to January 24, with a peak percentage of 37% on January 1.
Oceanside Harbor 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 2.9 months, from July 9 to October 7, with an average temperature above 68°F. The day of the year with the warmest water is August 24, with an average temperature of 70°F.
The time of year with cooler water lasts for 4.4 months, from December 8 to April 21, with an average temperature below 61°F. The day of the year with the coolest water is February 6, with an average temperature of 59°F.
Average Water Temperature
Best Time of Year to Visit
To characterize how pleasant the weather is at Oceanside Harbor 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 Oceanside Harbor for general outdoor tourist activities is from early June to early October, with a peak score in the third 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 Oceanside Harbor for hot-weather activities is from mid July to early September, with a peak score in the third 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.
Temperatures at Oceanside Harbor 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
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 3.9 months, from April 24 to August 21, with an average daily incident shortwave energy per square meter above 7.3 kWh. The brightest day of the year is June 21, with an average of 8.4 kWh.
The darker period of the year lasts for 3.2 months, from November 6 to February 11, with an average daily incident shortwave energy per square meter below 4.1 kWh. The darkest day of the year is December 26, with an average of 3.0 kWh.
Average Daily Incident Shortwave Solar Energy
This report illustrates the typical weather at Oceanside Harbor, 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
Oceanside Harbor has a weather station that reported reliably enough during the analysis period that we have included it in our network. When available, historical temperature and dew point measurements are taken directly from this weather station. These records are obtained from NOAA's Integrated Surface Hourly data set, falling back on ICAO METAR records as required.
In the case of missing or erroneous measurements from this station, we fall back on records from nearby stations, adjusted according to typical seasonal and diurnal intra-station differences. For a given day of the year and hour of the day, the fallback station is selected to minimize the prediction error over the years for which there are measurements for both stations.
The stations on which we may fall back include but are not limited to Oceanside, Camp Pendleton, Marine Corps Air Station; Oceanside Municipal Airport; McClellan–Palomar Airport; El Toro Mcas; Miramar Marine Corps Air Station; Fob Dwyer; Montgomery Field Airport; and John Wayne Airport-Orange County.
Time zones for aiports and weather stations are provided by AskGeo.com .