Skip to main content
One weather site to rule them all
checkweather.io
CheckWeather USFountain Valley
Forecast confidence: High · models disagree by 2°F

Fountain Valley weather

Loading live data…

Mostly clear,much the same tomorrow

NWS, the American and the European model agree on a high near 76° in Fountain Valley today. Tomorrow looks cloudy around 77°, with a 0% chance of rain.

76°65°
77°63°
76°67°
74°67°
75°66°
78°68°
Todaymodels agreeTomorrowmodels agreeSundaymodels agreeMondaymodels agreeTuesdaymodels agreeWednesdaysplit ±7°
NWSNational Blend (NBM)
76°
Mostly clear
Today 76°·Low 65°·Rain 0%
AmericanNOAA GFS
77°
Cloudy
Today 77°·Low 64°·Rain 0%
EuropeanECMWF
75°
Partly cloudy
Today 75°·Low 67°·Rain 0%
CheckWeather.io on iPhoneFree. No ads, no account.

Fountain Valley weather alerts and warnings

active National Weather Service watches, warnings and advisories

Checking the National Weather Service for active alerts covering Fountain Valley…

Fountain Valley weather in numbers

from 30 years of measured normals

Fountain Valley swings 32°F across the year, from 79°F highs in August to 47°F lows in January, and February is usually the wettest month in a year that brings about 23 in of precipitation.

Warmest month
August
79°F average high
Coldest month
January
47°F average low
Wettest month
February
23 in a year
Below freezing
Never
overnight lows stay above 32°F
Comfortable
4 months
January, March, April and May
Residents
57,000
share this forecast

The weather map: all three models at once

NWS, American, European side by side around Fountain Valley and nearby towns.Live rain radar →
Loading the three model maps…

Fountain Valley hourly forecast: next 14 hours

consensus of the three models

Rain in the next 24 hours, model by model

each model's own hourly precipitation, side by side

Loading the three models…

Fountain Valley 10-day forecast, out to 14 days

where the models agree, and where they split
Today
Mostly clear
76° 65°
models agree
Tomorrow
Cloudy
77° 63°
models agree
Sun
Cloudy
76° 67°
models agree
Mon
Partly cloudy
74° 67°
models agree
Tue
Mostly clear
75° 66°
models agree
Wed
Mostly clear
78° 68°
±7°
Thu
Mostly clear
77° 68°
±8°
Fri
Partly cloudy
79° 69°
±7°
Sat
Partly cloudy
80° 69°
±5°
Sun
Cloudy
83° 71°
±5°
Mon
Partly cloudy
82° 71°
±10°
Tue
Cloudy
81° 73°
±5°
Wed
Clear
76° 69°
±4°
Thu
Clear
73° 67°
±7°

Fountain Valley, California (CA) is at its warmest in Aug (average highs near 79°F) and coldest in Jan (lows around 47°F), with roughly 23 in of precipitation across the year. Below, compare what NWS, American, European forecast for Fountain Valley right now, and see exactly where they disagree.

We grade every model against the weather that actually happened, so you can see which forecast model is most accurate in United States before you trust any single number.

Fountain Valley climate by month

average daytime high and overnight low across a typical year
Jan
62°
47°
Feb
61°
47°
Mar
62°
49°
Apr
67°
51°
May
68°
56°
Jun
72°
59°
Jul
78°
61°
Aug
79°
63°
Sep
78°
62°
Oct
76°
58°
Nov
71°
52°
Dec
67°
50°

Which forecast is most accurate in Fountain Valley?

CheckWeather Score, graded against the weather that actually happened
ProviderCheckWeather-scoreTempWindRainRun by
European logo
European ★ Best
95
/100rank #1
92±0.8°F99±0.4 mph9597% hitECMWF - European Centre for Medium-Range Weather ForecastsReading, United Kingdom
American logo
American
87
/100rank #2
69±3.1°F97±1.0 mph100100% hitNOAA / NCEP (United States)College Park, Maryland, USA

The CheckWeather Score blends temperature, wind and rain accuracy, each measured against ERA5 (the recorded weather) over the last 30 days across 1999 cities. Lower error means a higher score. See which forecast model is most accurate in United States, how we measure forecast accuracy, or which model each weather app uses.

What do you think of the forecasts?

your vote counts

The accuracy above is the measured record. This is your opinion: which forecast service do you trust most in United States? Give each 1 to 5 stars.

NWSNational Blend (NBM)
Loading ratings…
AmericanNOAA GFS
Loading ratings…
EuropeanECMWF
Loading ratings…

One vote per service. Anonymous: we store no personal data, only a one-way hash of your connection for a day to stop double votes.

Where the models disagree

temperature and rain, judged separately
DayTemperatureRain
Today±2°75° to 77°models agree0% to 0% chance
Tomorrow±1°77° to 78°models agree0% to 0% chance
Sun±2°74° to 77°±3%1% to 4% chance
Mon±4°72° to 76°±1%2% to 3% chance
Tue±4°73° to 76°models agree2% to 2% chance

The models often agree on temperature and still split on rain, and rain is usually what decides whether a plan survives. A wide rain range means the shower is genuinely uncertain, not that the forecast is wrong.

Sunrise and sunset in Fountain Valley

today, local time
Sunrise
06:37
Sunset
18:53
Daylight
12h 16m

Common questions

What's the weather in Fountain Valley today?
On this page we show what NWS, American, European each forecast for Fountain Valley today, side by side and updated live. When all three agree the forecast is reliable; when they split, we flag it so you know the day is genuinely less certain.
Will it rain in Fountain Valley today or tomorrow?
Check the hourly strip and 7-day forecast above. We compare rain from NWS, American, European for Fountain Valley and flag the days where the models disagree on whether showers actually arrive, which is exactly when a single app can catch you out.
Which forecast is most accurate for Fountain Valley?
Over the last 30 days, the European model has been the most accurate for Fountain Valley (CheckWeather Score 95/100), ahead of the American at 87. We grade every model against the recorded weather. See the US accuracy scoreboard for the full method.
What is the warmest month in Fountain Valley?
August is typically the warmest month in Fountain Valley, with average highs around 79°F.
How cold does Fountain Valley get?
The coldest month in Fountain Valley is January, when overnight lows average about 47°F.
How much rain does Fountain Valley get?
Fountain Valley sees roughly 23 in of precipitation a year, with February usually the wettest month.

Nearby

More US weather