Weather in Jurupa Valley, California
Fog and sun in daily rhythm. Day 59 of spring. Read this microseason across nine climate regions →
When the dew is on the grass, rain will never come to pass.
- Moonrise
- 1:03 PM
- Moonset
- 3:14 AM
- In sign
- ♉︎ Taurus
Fog and sun in daily rhythm
Jurupa Valley at a glance
- Today vs. normal: NaN°F below the seasonal normal for this latitude
- Last frost: March 11 (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 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.