Weather in Oceanside, California
Fog and sun in daily rhythm. Day 59 of spring. Read this microseason across nine climate regions →
- TodayMay 16Overcast—71°62°
- SundayMay 17Overcast—68°56°
- MondayMay 18Overcast—72°56°
- TuesdayMay 19Overcast—73°59°
- WednesdayMay 20Overcast—73°59°
- ThursdayMay 21Overcast—74°59°
- FridayMay 22Clear—73°59°
- PM 2.5
- 12.9 μg/m³
- PM 10
- 21.4 μg/m³
- NO₂
- 3.2 μg/m³
- Ozone
- 91.0 μg/m³
- UV Index
- 0.1 Low
When the dew is on the grass, rain will never come to pass.
- Moonrise
- 1:05 PM
- Moonset
- 3:11 AM
- In sign
- ♉︎ Taurus
Fog and sun in daily rhythm
Oceanside at a glance
- Today vs. normal: 15°F below the seasonal normal for this latitude
- Last frost: March 6 (climatological average for this latitude)
- Microseason: 28 of 72, May 16–20
- Planting window: Direct sow okra, melons, and southern peas. Thin carrot rows.
Right now in the garden
Peak growing season
As of May 17, the growing season is at its peak — frost is months away. Continue succession-planting beans and summer squash. Start fall brassicas (broccoli, cabbage, kale) from seed indoors for transplanting in late summer.
Planting calendar
| Month | Plant | Harvest |
|---|---|---|
| January | — | — |
| February | — | — |
| March | lettuce, peas, spinach, radishes | — |
| April | lettuce, peas, spinach, radishes, tomatoes, peppers, beans, squash | — |
| May | tomatoes, peppers, beans, squash | lettuce, peas, radishes |
| June | tomatoes, peppers, beans, squash | lettuce, peas, radishes |
| July | — | tomatoes, beans, summer squash |
| August | — | tomatoes, beans, summer squash |
| September | — | tomatoes, beans, summer squash |
| October | fall brassicas, garlic (overwinter), carrots | winter squash, tomatoes (last) |
| November | fall brassicas, garlic (overwinter), carrots | — |
| December | — | — |
A year in weather
August brings Oceanside's warmest temperatures (~70°F mean) while December delivers the coldest (~53°F). Rainfall peaks in February (2.9 inches) and drops to nothing in August (0.0 inches).
| Month | Mean temp | Precip | Rainy days |
|---|---|---|---|
| January | 54° | 2.4″ | 3 |
| February | 54° | 2.9″ | 5 |
| March | 56° | 1.7″ | 3 |
| April | 58° | 0.9″ | 2 |
| May | 62° | 0.3″ | 1 |
| June | 66° | 0.1″ | 0 |
| July | 69° | 0.1″ | 0 |
| August | 70° | 0.0″ | 0 |
| September | 69° | 0.1″ | 0 |
| October | 64° | 0.6″ | 1 |
| November | 57° | 0.8″ | 2 |
| December | 53° | 2.0″ | 3 |
Regional context
Oceanside falls within a hot-summer Mediterranean climate region — sharing similar temperature ranges, seasonal patterns, and growing conditions with nearby cities in this climate zone.
Similar climates: Los Angeles, CA, San Francisco, CA, San Diego, CA, Riverside, CA, Sacramento, CA.
Naturalist notes
California poppies begin their spring bloom across Oceanside's coastal areas in late March.
Allen's hummingbirds return from their winter range in April, establishing territories along the coastline.
Frequently asked
- When does it freeze in Oceanside?
- Oceanside's last spring frost typically occurs around mid-March, with the first fall frost returning around mid-December.
- What is the rainy season in Oceanside?
- February receives the most rainfall with about 2.9 inches on average; the city gets roughly 12 inches annually.
- What is the warmest month in Oceanside?
- August typically brings the warmest weather, averaging about 70°F.
- What is the coldest month in Oceanside?
- December usually brings the coldest temperatures, averaging about 53°F.
- When can I start a vegetable garden in Oceanside?
- Cool-season crops (peas, lettuce) can be planted around the last spring frost (mid-March); warm-season crops (tomatoes, peppers) should wait until 1–2 weeks after.
- How many rainy days does Oceanside get?
- Oceanside averages about 20 rainy days per year.
- What hardiness zone is Oceanside?
- Oceanside's USDA hardiness zone depends on its lowest average winter temperature; check the USDA's online lookup with the city ZIP for the current zone designation.
Climate
Oceanside, California experiences a hot-summer Mediterranean climate zone. January temperatures hover near 54°F while July averages 69°F — a 16°F seasonal swing.
Throughout the year, Oceanside receives about 12 inches of precipitation spread over roughly 20 rainy days.
Geographic factors determine the annual rhythm: latitude (33.2°N), proximity to large water bodies, and elevation shape what grows here, when frost occurs, and daily weather patterns.