Jurupa Valley, California Weather
Coastal fog thickens at dawn. Day 77 of spring. Read this microseason across nine climate regions →
Jurupa Valley weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 3Foggy——89°56°—
- ThursdayJun 4Mostly Clear——93°57°+4°
- FridayJun 5Foggy——91°56°-2°
- SaturdayJun 6Overcast——89°69°-2°
- SundayJun 7Clear——87°65°-2°
- MondayJun 8Clear——90°67°+3°
- TuesdayJun 9Clear——89°68°-1°
PM2.5 at 20.8 µg/m³ (AQI 73) with a 0.75 fine-to-coarse ratio and 4 mph wind — combustion smoke trapped in calm air, not road dust. AQI up 38 in the last 6 hours — air quality is degrading.
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion during the projected peak around 7 AM.
What's driving it
Ozone × UV × Sky
Ozone at AQI 41 now. With UV 0.0 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 10 by mid-afternoon.
- Present
- AQI 41
- UV peak
- 0.0 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 10
PM × Wind × Precip
PM2.5 at 20.8 µg/m³ (AQI 73) with a 0.75 fine-to-coarse ratio and 4 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.75
- 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
- 6:03 AM
- Moonset
- 4:13 PM
- In sign
- ♑︎ Capricorn
Coastal fog thickens at dawn
Jurupa Valley at a glance
- Today vs. normal: 14°F below the seasonal normal for this latitude
- Last frost: March 11 (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
August is Jurupa Valley's warmest month with a mean near 81°F, and December is the coldest at about 56°F. Rainfall peaks in February at 2.5 inches and drops to its low point of 0.1 inches in June.
| Month | Mean temp | Precip | Rainy days |
|---|---|---|---|
| January | 56° | 2.2″ | 4 |
| February | 57° | 2.5″ | 5 |
| March | 60° | 1.6″ | 3 |
| April | 64° | 0.6″ | 1 |
| May | 68° | 0.2″ | 1 |
| June | 74° | 0.1″ | 0 |
| July | 80° | 0.1″ | 0 |
| August | 81° | 0.1″ | 0 |
| September | 77° | 0.1″ | 0 |
| October | 69° | 0.4″ | 1 |
| November | 61° | 0.7″ | 2 |
| December | 56° | 1.4″ | 3 |
Regional context
Jurupa Valley belongs to a hot-summer Mediterranean climate region — a cohort of nearby cities that share similar temperature ranges, seasonal rhythms, and growing conditions.
Similar climates: Los Angeles, CA, San Francisco, CA, San Diego, CA, Riverside, CA, Sacramento, CA.
Naturalist notes
In late May, western fence lizards emerge in force across open rocky ground and sun-warmed retaining walls as daytime highs push into the 80s.
By late April, cliff swallows are gathering mud for their gourd-shaped nests on the undersides of freeway overpasses and bridges throughout the valley.
Frequently asked
- When does it freeze in Jurupa Valley?
- Jurupa Valley's last spring frost typically falls around mid-March, with the first fall frost arriving around mid-December.
- What is the rainy season in Jurupa Valley?
- February is the wettest month, averaging about 2.5 inches of rain; the city receives roughly 10 inches annually.
- What is the warmest month in Jurupa Valley?
- August is typically the warmest month, averaging about 81°F.
- What is the coldest month in Jurupa Valley?
- December is typically the coldest month, averaging about 56°F.
- When can I start a vegetable garden in Jurupa Valley?
- Cool-season crops like peas and lettuce can be sown around the last spring frost in mid-March; warm-season crops such as tomatoes and peppers wait until 1–2 weeks after.
- How many rainy days does Jurupa Valley get?
- Jurupa Valley averages about 19 rainy days per year.
- What hardiness zone is Jurupa Valley?
- Jurupa Valley'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
Jurupa Valley, California lies in a hot-summer Mediterranean climate zone. January means sit around 56°F, while July averages 80°F — a 23°F swing between seasons.
Over the course of a year, the city collects roughly 10 inches of precipitation scattered across about 19 rainy days.
Latitude (34.0°N), proximity to large bodies of water, and elevation set the rhythm of the year here. Those factors influence what can grow, when frost is likely, and the shape of everyday weather.