Fountain Valley, California Weather
Summer heat deepens across the valleys. Day 15 of summer. Read this microseason across nine climate regions →
Fountain Valley weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 5Overcast——78°64°—
- MondayJul 6Partly Cloudy——76°61°-2°
- TuesdayJul 7Mostly Clear——73°62°-3°
- WednesdayJul 8Clear——74°68°+1°
- ThursdayJul 9Clear——75°68°+1°
- FridayJul 10Overcast——75°68°0°
- SaturdayJul 11Overcast——74°69°-1°
AQI 35 (Good), driven by PM2.5. AQI flat over the last 6 hours (within ±3 points). PM2.5 at 9.5 µg/m³ (AQI 52) with a 0.75 fine-to-coarse ratio and 4 mph wind — combustion smoke trapped in calm air, not road dust.
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion.
What's driving it
PM × Wind × Precip
PM2.5 at 9.5 µg/m³ (AQI 52) 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).
If the first of July be rainy weather, 'twill rain more or less for four weeks together.
- Moonrise
- 11:07 PM
- Moonset
- 11:10 AM
- In sign
- ♓︎ Pisces
Summer heat deepens across the valleys
Fountain Valley at a glance
- Today vs. normal: 3°F below the seasonal normal for this latitude
- Last frost: March 9 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
ZIP code: 92708
16-Day Forecast — Fountain Valley
- Sun78°64°0%
- Mon76°61°1%
- Tue73°62°0%
- Wed74°68°0%
- Thu75°68°0%
- Fri75°68°0%
- Sat74°69°1%
- Sun78°69°2%
- Mon75°68°5%
- Tue79°71°8%
- Wed78°72°4%
- Thu79°73°6%
- Fri77°72°13%
- Sat77°72°13%
- Sun78°71°10%
- Mon78°70°6%
Forecast data from Open-Meteo (CC BY 4.0).
Live wind & temperature near Fountain Valley
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 | 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
Fountain Valley's warmest month is August (~73°F mean) and its coldest is January (~54°F). Rainfall peaks in February (2.5 inches) and bottoms out in August (0.0 inches).
| Month | Mean temp | Precip | Rainy days |
|---|---|---|---|
| January | 54° | 2.3″ | 9 |
| February | 56° | 2.5″ | 8 |
| March | 58° | 2.0″ | 9 |
| April | 61° | 0.9″ | 7 |
| May | 64° | 0.3″ | 4 |
| June | 68° | 0.0″ | 2 |
| July | 72° | 0.1″ | 1 |
| August | 73° | 0.0″ | 0 |
| September | 72° | 0.0″ | 2 |
| October | 68° | 0.3″ | 3 |
| November | 60° | 1.1″ | 6 |
| December | 54° | 1.8″ | 7 |
Regional context
By the nearest station's NOAA NCEI 1991-2020 normals, Fountain Valley sees 54°F Januarys and 72°F Julys, a 18°F range, plus around 11.3 inches of precipitation across 57 days.
Fountain Valley's moisture rides winter storm tracks: February brings 2.5 inches over 7.6 wet days, while August sees only 0.0 inches across 0.2 days in the dry warm season. That cool-season-wet pattern aligns Fountain Valley with places like Huntington Beach, CA, Midway City, CA and Costa Mesa, CA.
Freezes are uncommon in Fountain Valley, where the coldest month averages 54°F; cool-season crops grow fall through spring. Summer heat in August (about 73°F) is the binding constraint, not cold. Across Fountain Valley, elevation and tree cover drive a 4-7°F spread in Fountain Valley's overnight lows.
Similar climates: Huntington Beach, CA, Midway City, CA, Costa Mesa, CA, Westminster, CA, Santa Ana, CA.
Frequently asked
- When does it freeze in Fountain Valley?
- Fountain Valley's last spring frost lands near mid-March, and in Fountain Valley the first fall frost follows around mid-December.
- What is the rainy season in Fountain Valley?
- February is the wettest month in Fountain Valley, about 2.5 inches on average; the year totals roughly 11 inches.
- What is the warmest month in Fountain Valley?
- Fountain Valley peaks in August, when the mean runs near 73°F.
- What is the coldest month in Fountain Valley?
- January is Fountain Valley's coldest month, averaging about 54°F.
- When can I start a vegetable garden in Fountain Valley?
- Hardy spring crops go in near mid-March in Fountain Valley; tender peppers and squash wait 10–14 days.
- How many rainy days does Fountain Valley get?
- Fountain Valley averages about 57 days with measurable rain or snow each year.
- What hardiness zone is Fountain Valley?
- Since January in Fountain Valley averages 54°F, Fountain Valley's USDA zone follows that floor — confirm it by ZIP.
- What is the 10-day forecast for Fountain Valley?
- Fountain Valley'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 Fountain Valley?
- See this week's day-by-day rain chances for Fountain Valley in the daily forecast above, and the next 24 hours in the hourly chart.
- What is the weather like right now in Fountain Valley?
- Current conditions for Fountain Valley and the next 24 hours — temperature, precipitation chance, and wind by the hour — are in the hourly forecast chart above.
- How often is the Fountain Valley forecast updated?
- The Fountain Valley forecast on this page is built from Open-Meteo weather-model data and refreshes regularly through the day.
- When are sunrise and sunset in Fountain Valley?
- Today's sunrise and sunset times for Fountain Valley 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 Fountain Valley?
- The next few days in Fountain Valley's forecast are the most reliable; accuracy declines beyond about a week as weather-model uncertainty grows.
Climate
Set in a hot-summer Mediterranean zone, Fountain Valley, California swings from 54°F in the heart of winter to 72°F at midsummer — a 18°F arc.
Fountain Valley sees close to 11 inches of precipitation annually, falling across some 57 wet days.
Fountain Valley's 18°F range, set by its 33.7°N position, drives frost timing and what thrives in Fountain Valley.
ZIP codes in Fountain Valley
- 92708
- 92728