Spring Valley Lake, California Weather
Coastal fog thickens at dawn. Day 77 of spring. Read this microseason across nine climate regions →
Spring Valley Lake weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 4Clear——95°62°—
- FridayJun 5Clear——92°62°-3°
- SaturdayJun 6Overcast——86°62°-6°
- SundayJun 7Clear——88°57°+2°
- MondayJun 8Clear——88°58°0°
- TuesdayJun 9Clear——84°56°-4°
- WednesdayJun 10Clear——80°57°-4°
PM2.5 at 18.2 µg/m³ (AQI 68) with a 0.78 fine-to-coarse ratio and 1 mph wind — combustion smoke trapped in calm air, not road dust. AQI down 71 over the last 6 hours — air quality is improving sharply.
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 30 now. With UV 3.3 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 13 by mid-afternoon.
- Present
- AQI 30
- UV peak
- 3.3 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 13
PM × Wind × Precip
PM2.5 at 18.2 µg/m³ (AQI 68) with a 0.78 fine-to-coarse ratio and 1 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.78
- Wind
- calm
- Recent rain
- 0h in last 6h
- Pattern
- stagnant smoke
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).
A summer fog for fair, a winter fog for rain.
- Moonrise
- 6:04 AM
- Moonset
- 4:11 PM
- In sign
- ♑︎ Capricorn
Coastal fog thickens at dawn
Spring Valley Lake at a glance
- Today vs. normal: 15°F below the seasonal normal for this latitude
- Last frost: March 14 (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 4, 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
Spring Valley Lake's warmest month is July (~81°F mean) and its coldest is December (~45°F). Rainfall peaks in February (1.3 inches) and bottoms out in June (0.0 inches).
| Month | Mean temp | Precip | Rainy days |
|---|---|---|---|
| January | 46° | 1.0″ | 2 |
| February | 48° | 1.3″ | 3 |
| March | 53° | 0.8″ | 2 |
| April | 59° | 0.3″ | 1 |
| May | 66° | 0.1″ | 0 |
| June | 75° | 0.0″ | 0 |
| July | 81° | 0.2″ | 1 |
| August | 80° | 0.1″ | 0 |
| September | 74° | 0.2″ | 0 |
| October | 63° | 0.3″ | 1 |
| November | 52° | 0.3″ | 1 |
| December | 45° | 0.9″ | 2 |
Regional context
Spring Valley Lake sits within a hot-summer Mediterranean climate region — a cohort that shares similar temperature ranges, seasonal patterns, and growing conditions across nearby cities.
Similar climates: Los Angeles, CA, San Francisco, CA, San Diego, CA, Riverside, CA, Sacramento, CA.
Frequently asked
- When does it freeze in Spring Valley Lake?
- Spring Valley Lake's last spring frost typically falls around mid-March, and the first fall frost arrives around mid-December.
- What is the rainy season in Spring Valley Lake?
- February is the wettest month with about 1.3 inches of rain on average; the city receives roughly 6 inches annually.
- What is the warmest month in Spring Valley Lake?
- July is typically warmest, averaging about 81°F.
- What is the coldest month in Spring Valley Lake?
- December is typically coldest, averaging about 45°F.
- When can I start a vegetable garden in Spring Valley Lake?
- Cool-season crops (peas, lettuce) can be sown around the last spring frost (mid-March); warm-season crops (tomatoes, peppers) wait until 1–2 weeks after.
- How many rainy days does Spring Valley Lake get?
- Spring Valley Lake averages about 13 rainy days per year.
- What hardiness zone is Spring Valley Lake?
- Spring Valley Lake's USDA hardiness zone is determined by its lowest average winter temperature; check the USDA's online lookup with the city ZIP for the current zone designation.
Climate
Spring Valley Lake, California sits in a hot-summer Mediterranean climate zone. January means hover near 46°F while July averages 81°F — a 35°F seasonal swing.
Across the year, Spring Valley Lake receives about 6 inches of precipitation spread over roughly 13 rainy days.
The rhythm of the year is set by latitude (34.5°N), proximity to large water bodies, and elevation — all of which shape what grows here, when frost is likely, and what the weather story looks like day to day.