Sunnyside, California Weather
Summer heat deepens across the valleys. Day 15 of summer. Read this microseason across nine climate regions →
Sunnyside weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 5Overcast21%—97°73°—
- MondayJul 6Overcast——98°68°+1°
- TuesdayJul 7Overcast——101°69°+3°
- WednesdayJul 8Clear——103°70°+2°
- ThursdayJul 9Clear——107°74°+4°
- FridayJul 10Clear——108°77°+1°
- SaturdayJul 11Overcast——110°79°+2°
AQI 58 (Moderate), driven by PM2.5. AQI flat over the last 6 hours (within ±3 points). PM2.5 at 13.9 µg/m³, PM10 at 27.2 µg/m³ — typical background levels with no transport signature.
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 39 now. With UV 7.8 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 40 around 1 PM.
- Present
- AQI 39
- UV peak
- 7.8 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 40
PM × Wind × Precip
PM2.5 at 13.9 µg/m³, PM10 at 27.2 µg/m³ — typical background levels with no transport signature.
- PM2.5/PM10
- 0.51
- Wind
- calm
- Recent rain
- 0h in last 6h
- Pattern
- background
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).








































If the first of July be rainy weather, 'twill rain more or less for four weeks together.
- Moonrise
- 11:17 PM
- Moonset
- 11:17 AM
- In sign
- ♓︎ Pisces
Summer heat deepens across the valleys
Sunnyside at a glance
- Today vs. normal: 12°F above the seasonal normal for this latitude
- Last frost: March 27 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
16-Day Forecast — Sunnyside
- Sun97°73°21%
- Mon98°68°0%
- Tue101°69°0%
- Wed103°70°0%
- Thu107°74°0%
- Fri108°77°0%
- Sat110°79°0%
- Sun97°82°2%
- Mon103°76°3%
- Tue107°83°4%
- Wed111°85°1%
- Thu112°84°3%
- Fri114°85°3%
- Sat109°86°10%
- Sun110°86°5%
- Mon109°80°10%
Forecast data from Open-Meteo (CC BY 4.0).
Right now in the garden
Peak growing season
As of July 5, 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.
Microseason · July 1–5
Summer heat deepens across the valleys
Inland temperatures exceed 95°F regularly; fire danger reaches moderate to high across most of the region.
Day 186 of 365 · Wedge 37 of 72
Planting calendar
| Month | Plant | Harvest |
|---|---|---|
| January | — | — |
| February | — | — |
| March | — | — |
| April | lettuce, peas, spinach, radishes | — |
| May | lettuce, peas, spinach, radishes, tomatoes, peppers, beans, squash | lettuce, peas, radishes |
| June | tomatoes, peppers, beans, squash | lettuce, peas, radishes |
| July | tomatoes, peppers, beans, squash | tomatoes, beans, summer squash |
| August | — | tomatoes, beans, summer squash |
| September | fall brassicas, garlic (overwinter), carrots | tomatoes, beans, summer squash |
| October | fall brassicas, garlic (overwinter), carrots | winter squash, tomatoes (last) |
| November | — | — |
| December | — | — |
A year in weather
Sunnyside's warmest month is July (~84°F mean) and its coldest is December (~48°F). Rainfall peaks in January (2.2 inches) and bottoms out in August (0.0 inches).
| Month | Mean temp | Precip | Rainy days |
|---|---|---|---|
| January | 48° | 2.2″ | 5 |
| February | 52° | 1.9″ | 5 |
| March | 57° | 1.9″ | 4 |
| April | 62° | 1.0″ | 2 |
| May | 70° | 0.4″ | 1 |
| June | 78° | 0.2″ | 0 |
| July | 84° | 0.0″ | 0 |
| August | 82° | 0.0″ | 0 |
| September | 77° | 0.1″ | 0 |
| October | 67° | 0.6″ | 1 |
| November | 55° | 0.9″ | 2 |
| December | 48° | 1.8″ | 4 |
Regional context
Sunnyside swings from 48°F in January to 84°F in July (36°F) per NOAA NCEI 1991-2020 normals; precipitation in Sunnyside runs about 11 inches on roughly 26 measurable days.
Sunnyside's moisture rides winter storm tracks: January brings 2.2 inches over 4.8 wet days, while August sees only 0.0 inches across 0.0 days in the dry warm season. It is a winter-storm rhythm Sunnyside shares with places like Calwa, CA, Malaga, CA and Tarpey Village, CA.
With a coldest-month mean of 48°F, Sunnyside stays mostly frost-free and grows year-round. The July peak near 84°F is Sunnyside's real limit, pushing cool-season vegetables to spring and fall. Within Sunnyside, low or inland lots lose 3-5°F overnight versus Sunnyside's coastal ground.
Similar climates: Calwa, CA, Malaga, CA, Tarpey Village, CA, Mayfair, CA, Fresno, CA.
Frequently asked
- When does it freeze in Sunnyside?
- In Sunnyside, expect the last spring frost near mid-April; Sunnyside's first autumn frost comes around mid-November.
- What is the rainy season in Sunnyside?
- Rainfall in Sunnyside peaks in January near 2.2 inches, out of about 11 inches annually.
- What is the warmest month in Sunnyside?
- July is Sunnyside's warmest month, averaging about 84°F.
- What is the coldest month in Sunnyside?
- Sunnyside bottoms out in December, with a mean near 48°F.
- When can I start a vegetable garden in Sunnyside?
- Time tomatoes in Sunnyside for two weeks after mid-April; peas and greens start at Sunnyside's frost line.
- How many rainy days does Sunnyside get?
- Sunnyside records around 26 days of measurable precipitation annually.
- What hardiness zone is Sunnyside?
- Sunnyside's hardiness zone tracks its winter low; with December near 48°F, check the USDA ZIP map for the exact zone.
- What is the 10-day forecast for Sunnyside?
- Sunnyside's extended outlook — daily high and low temperatures and precipitation chances for each upcoming day — is in the daily forecast above.
- Will it rain this week in Sunnyside?
- See this week's day-by-day rain chances for Sunnyside in the daily forecast above, and the next 24 hours in the hourly chart.
- What is the weather like right now in Sunnyside?
- Current conditions for Sunnyside and the next 24 hours — temperature, precipitation chance, and wind by the hour — are in the hourly forecast chart above.
- How often is the Sunnyside forecast updated?
- The Sunnyside forecast on this page is built from Open-Meteo weather-model data and refreshes regularly through the day.
- When are sunrise and sunset in Sunnyside?
- Today's sunrise and sunset times for Sunnyside are in the Almanac section above, along with civil dawn, civil dusk, and day length. Day length is longest near the summer solstice and shortest near the winter solstice.
- How accurate is the weather forecast for Sunnyside?
- The next few days in Sunnyside's forecast are the most reliable; accuracy declines beyond about a week as weather-model uncertainty grows.
Climate
Sunnyside, California occupies a hot-summer Mediterranean zone, with January means near 48°F and July around 84°F — a 36°F swing.
Yearly precipitation in Sunnyside totals around 11 inches, spread over about 26 days of rain or snow.
The 36°F gap between Sunnyside's summer and winter, at 36.7°N, shapes Sunnyside's frost calendar.
ZIP codes in Sunnyside
- 93727