Oceanside climate
Oceanside (California, United States) has a cold semi-arid climate (Köppen BSk). The average temperature over the year is 18 °C64 °F, and about 314 mm12 in of precipitation falls in an average year.
Temperature by month
Precipitation by month
Oceanside climate table
| Month | High °C°F | Low °C°F | Mean °C°F | Precip. mmin |
|---|---|---|---|---|
| Jan | 1763 | 1355 | 1559 | 592.3 |
| Feb | 1763 | 1254 | 1558 | 682.7 |
| Mar | 1864 | 1355 | 1559 | 341.3 |
| Apr | 1865 | 1356 | 1660 | 210.8 |
| May | 1967 | 1458 | 1762 | 80.3 |
| Jun | 2170 | 1660 | 1865 | 50.2 |
| Jul | 2474 | 1865 | 2170 | 40.1 |
| Aug | 2576 | 1966 | 2271 | 30.1 |
| Sep | 2576 | 1966 | 2271 | 50.2 |
| Oct | 2373 | 1763 | 2068 | 170.7 |
| Nov | 2068 | 1559 | 1864 | 281.1 |
| Dec | 1763 | 1355 | 1559 | 632.5 |
| Year | 2576 | 1254 | 1864 | 31412 |
“Year” row: highest monthly high, lowest monthly low, annual mean and annual total.
| Month | Humid. | Cloud | Solar | Daylight |
|---|---|---|---|---|
| Jan | 69% | 41% | 3.2 | 10:11 |
| Feb | 72% | 43% | 4.1 | 10:57 |
| Mar | 75% | 43% | 5.4 | 11:53 |
| Apr | 76% | 40% | 6.5 | 12:58 |
| May | 78% | 43% | 6.9 | 13:52 |
| Jun | 78% | 42% | 7.3 | 14:20 |
| Jul | 76% | 35% | 7.4 | 14:08 |
| Aug | 73% | 29% | 7.1 | 13:22 |
| Sep | 72% | 28% | 6.0 | 12:20 |
| Oct | 71% | 33% | 4.6 | 11:17 |
| Nov | 68% | 36% | 3.6 | 10:24 |
| Dec | 69% | 42% | 2.9 | 9:58 |
Humid. = average relative humidity at 2 m; cloud = average cloud amount; solar = average daily solar energy reaching the ground in kWh/m² (all-sky); daylight in hours:minutes, calculated for the 15th of each month.
What the climate of Oceanside is like
The warmest month is September, with an average high of 25 °C76 °F and a low of 19 °C66 °F. The coldest is February, when highs average 17 °C63 °F and lows 12 °C54 °F. Seasonal differences are small — just 7.1 °C12.8 °F between the warmest and the coolest month.
It is dry, with about 314 mm12 in of precipitation per year. The wettest three-month stretch is December–February, which brings 60% of the annual total. Months with less than 20 mm0.8 in on average: May–October. The wettest month is February (68 mm2.7 in), the driest is August (3 mm0.1 in).
Relative humidity ranges from 68% in November to 78% in May. The clearest skies (lowest average cloud amount, 28%) are typical of September. Average wind speed near the ground ranges from 8 km/h (5 mph) in July to 10 km/h (6 mph) in April. Daylight lasts from about 10.0 hours in December to 14.3 hours in June.
Best time to visit Oceanside
Based on these averages, the most comfortable months for sightseeing and outdoor activities are April–November: average highs of 18 °C65 °F to 25 °C76 °F with 3 mm0.1 in to 28 mm1.1 in of precipitation per month.
Comfort score: months are ranked by how close they come to an average high of 21–28 °C (70–82 °F), lows above 5 °C (41 °F), little precipitation and moderate humidity. The best-ranked months of each place are recommended, even where none meets all of these. These are general rules of thumb applied to long-term averages.
What to pack for Oceanside
- Winter (December–February) — highs around 17 °C63 °F, lows 1254 to 13 °C55 °F, about 63 mm2.5 in of precipitation a month. Pack long sleeves, a sweater and a medium jacket.
- Spring (March–May) — highs 1864 to 19 °C67 °F, lows 1355 to 14 °C58 °F, about 21 mm0.8 in of precipitation a month. Pack light layers — T-shirts plus a light sweater or jacket.
- Summer (June–August) — highs 2170 to 25 °C76 °F, lows 1660 to 19 °C66 °F, about 4 mm0.2 in of precipitation a month. Pack light layers — T-shirts plus a light sweater or jacket.
- Autumn (September–November) — highs 2068 to 25 °C76 °F, lows 1559 to 19 °C66 °F, about 17 mm0.7 in of precipitation a month. Pack light layers — T-shirts plus a light sweater or jacket.
How Oceanside compares
Compared with San Diego, about 57 km to the south, Oceanside is on average 1.7 °C3 °F cooler and receives 17% more precipitation (314 mm12 in vs 269 mm11 in). The difference is largest in July (4 °C7.2 °F cooler).
Of the 222 places in the United States covered by World Climates, Oceanside is the 72nd warmest by annual mean temperature and the 202nd wettest by annual precipitation. See all of them on the United States climate page.
Places in other countries with the most similar temperature and rainfall pattern: Funchal (Portugal, Csb), Safi (Morocco, BSh) and Tijuana (Mexico, BSh).
The same NASA POWER grid cell also contains Carlsbad (pop. 114,746) and Vista (pop. 100,890). Their long-term averages in this dataset are essentially the same as for Oceanside, so they do not have separate pages.
Nearby places
- Escondido 29 km · 20 °C67 °F · 320 mm13 in
- Temecula 39 km · 20 °C68 °F · 299 mm12 in
- Murrieta 43 km · 17 °C63 °F · 298 mm12 in
- San Diego 57 km · 19 °C67 °F · 269 mm11 in
- El Cajon 59 km · 20 °C68 °F · 320 mm13 in
- Santa Ana 76 km · 17 °C63 °F · 311 mm12 in
- Riverside 84 km · 20 °C68 °F · 289 mm11 in
- Tijuana 85 km · 19 °C66 °F · 269 mm11 in
Frequently asked questions
What is the warmest month in Oceanside?
September is the warmest month in Oceanside, with an average high of 25 °C (76 °F) and an average low of 19 °C (66 °F).
What is the coldest month in Oceanside?
February is the coldest month, with an average high of 17 °C (63 °F) and an average low of 12 °C (54 °F).
When does it rain the most in Oceanside?
February is the wettest month with about 68 mm (2.7 in) of precipitation; August is the driest with about 3 mm (0.1 in).
What is the best time to visit Oceanside?
Judging by long-term averages, the most comfortable months are April–November.
About this data
All figures are 25-year averages (January 2001 – December 2025) from the NASA POWER project. Temperature, humidity, wind and precipitation come from the MERRA-2 reanalysis (precipitation is the bias-corrected MERRA-2 product), cloud and solar values from CERES satellite data. They describe a grid cell of roughly 50–70 km, not a single weather station, so they can differ from airport records — most of all on coasts, in mountains and for rainfall. Average highs and lows are the monthly mean temperature plus/minus half of the average daily temperature range. Counts of rainy days are not part of this dataset.
The grid cell’s average elevation is 76 m, while Oceanside lies at about 20 m. Temperatures on this page were therefore adjusted by +0.4 °C0.7 °F using the standard lapse rate of 6.5 °C per 1,000 m.