Oceanside, CA climate
Oceanside has warm winters and pleasant summers, with very little rain. A typical July afternoon reaches 78°, a January night drops to 47°.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Oceanside feels like
Winter
Spring
Summer
Fall
Oceanside weather by month
Average highs, lows, rain and snow for every month, from NOAA’s 1991–2020 normals.
| Month | High | Low | Rain + melt | 30-yr range |
|---|---|---|---|---|
| January | 67° | 47° | 2.6" | 54° – 61° |
| February | 67° | 47° | 2.9" | 53° – 63° |
| March | 68° | 49° | 1.8" | 54° – 64° |
| April | 69° | 51° | 0.8" | 57° – 65° |
| May | 71° | 56° | 0.3" | 60° – 68° |
| June | 74° | 59° | 0.1" | 63° – 70° |
| July | 78° | 63° | 0.0" | 67° – 76° |
| August | 80° | 64° | 0.0" | 69° – 75° |
| September | 80° | 61° | 0.1" | 67° – 75° |
| October | 77° | 57° | 0.5" | 62° – 72° |
| November | 72° | 50° | 1.0" | 56° – 65° |
| December | 67° | 46° | 1.9" | 54° – 60° |
| Year | 73° | 54° | 11.8" |
“Wet days” have at least 0.01" of rain or melted snow. “Snow on ground” counts days with 1" or more. The 30-year range is the coldest and warmest that month’s average temperature got between 1991 and 2020.
Rain and snow in Oceanside
Oceanside gets 12 inches of rain and melted snow a year. February is the wettest month and August the driest.
A year-round growing season
Heating and cooling a home in Oceanside
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Oceanside, 67% of that work is heating and 33% is cooling.
Degree days measure how far each day’s average temperature falls below or rises above 65°, added up over a year. Source: NOAA station normals.
Oceanside and its neighbors
Oceanside borders 4 towns with climate data. January nights across them vary by 3.0°. Bonsall has both the coldest January nights (45°) and the hottest July afternoons (85°). Oceanside’s January low is 47° and its July high 78°.
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value.
How Oceanside compares
Compared with every U.S. town and city on TownTapestry, each counted once.
Warmer than it used to be
The last 30 years in Oceanside averaged 1.8° warmer than the 1900s. The biggest change is in January (+2.9°). The shift is larger than in 86% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Oceanside’s spot on NOAA’s grid
How much a month can swing
A normal is an average, and real years wander around it. March swings the most: between 1991 and 2020 its average temperature ranged from 54° to 64°. August is the most reliable, staying within 6°.
Common questions about Oceanside’s climate
What is the coldest month in Oceanside?
December, with a typical high of 67° and a low of 46°.
What is the hottest month in Oceanside?
August, with a typical high of 80° and a low of 64°. About 19 days a year reach 90°.
When is the first frost in Oceanside?
Frost is uncommon. Only 35% of years see a night at 32° or below.
What is the rainiest month in Oceanside?
February, with 2.9 inches of rain and melted snow. The year totals 12 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Oceanside itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Vista, CA (4 mi, frost, heat and degree days). Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.