Oceanside, California Weather
Coastal fog thickens at dawn. Day 76 of spring. Read this microseason across nine climate regions →
Oceanside weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 3Overcast——71°61°—
- ThursdayJun 4Foggy——71°57°0°
- FridayJun 5Foggy——75°59°+4°
- SaturdayJun 6Overcast——73°60°-2°
- SundayJun 7Overcast——72°58°-1°
- MondayJun 8Overcast——73°58°+1°
- TuesdayJun 9Partly Cloudy——76°58°+3°
Ozone at AQI 95 now. AQI flat over the last 6 hours (within ±3 points). With UV 9.8 peaking around 1 PM under partly cloudy skies, surface ozone likely climbs to AQI 88 by mid-afternoon.
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion.
What's driving it
Ozone × UV × Sky
Ozone at AQI 95 now. With UV 9.8 peaking around 1 PM under partly cloudy skies, surface ozone likely climbs to AQI 88 by mid-afternoon.
- Present
- AQI 95
- UV peak
- 9.8 at 1 PM
- Sky at peak
- partly cloudy
- Projected peak
- AQI 88
PM × Wind × Precip
PM2.5/PM10 ratio 0.69 with 9 mph wind — characteristic of long-range haze transport rather than a local source.
- PM2.5/PM10
- 0.69
- Wind
- light
- Recent rain
- 0h in last 6h
- Pattern
- transport
Trends
Seven days of AQI and PM2.5.
Hourly air-quality data from the Copernicus Atmosphere Monitoring Service, charted across the past and next several days. Dashed lines mark the AQI breakpoints at 50 (Good → Moderate) and 100 (Moderate → Unhealthy for Sensitive Groups).
The higher the clouds, the finer the weather.
- Moonrise
- 5:21 AM
- Moonset
- 3:14 PM
- In sign
- ♑︎ Capricorn
Coastal fog thickens at dawn
Oceanside at a glance
- Today vs. normal: 12°F below the seasonal normal for this latitude
- Last frost: March 6 (climatological average for this latitude)
- Microseason: Jun 1–5
- Planting window: Harvest spring lettuce before it bolts. Sow heat-tolerant greens.
Right now in the garden
Peak growing season
As of June 3, 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.