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Grover Beach, CA Weather
Grover Beach, California sits at 35.1209, -120.6197. Its warmest month is September, when the day usually reaches 80F, and its coldest is January, when the night usually falls to 41F. February is the wettest, with rain on about 10 days. The hottest day in the station record is 117F on September 6, 2020, and the coldest night 21F on January 14, 2007. This page carries live conditions, an hour by hour timeline, a ten day outlook, radar, monthly averages and searchable daily history back to 1940.
About Grover Beach weather
Grover Beach sits at 35.1209, -120.6197 and covers about 2.312 square miles. The forecast above is live: current conditions lead with the HRRR model, corrected against the nearest reporting station and against radar overhead, because a model can lag a storm and the radar cannot.
The tabs at the top of this page carry the hour by hour timeline, the ten day outlook and live radar. Where the models disagree about a day, the rock says so on the day rather than quietly picking a winner.
The rock grades itself against what actually happened and publishes the result whether it flatters it or not. Those standings live in the Receipts.
Where these numbers come from
Current conditions and forecast: NOAA forecast grids (the National Weather Service digital forecast, the National Blend of Models, HRRR and GFS) decoded on our own server, corrected against the nearest reporting station and our own radar. Open-Meteo is consulted only as a fallback when our server is silent.
Radar: NOAA MRMS merged reflectivity, rendered into tiles by myweatherrock.
Monthly averages and records: computed by myweatherrock from NOAA GHCN-Daily station records at the nearest qualifying station, named on this page with its distance. Measurements, not estimates.
Daily history search: the town's own NOAA GHCN-Daily station file, held on our server, measurements by day. Months the station missed fall back to the Open-Meteo historical archive (reanalysis), and the page says so when it does.
What the weather is usually like in Grover Beach
Grover Beach is warmest in September, when the day usually reaches 80F, and coldest in January, when the night usually falls to 41F. February is the wettest month, with rain on about 10 days of it.
Usual high and low, by month
Days with rain, by month
The same year as numbers
Month
Usual high
Usual low
Rain days
January
66F
41F
8
February
65F
42F
10
March
67F
44F
8
April
69F
46F
5
May
72F
49F
3
June
75F
52F
1
July
78F
55F
0
August
79F
55F
0
September
80F
54F
1
October
78F
51F
4
November
71F
45F
6
December
65F
41F
8
Thirty-year normals, 1991 to 2020, computed from the daily record, measured at the San Luis Obispo Mcchesney Fld station 8.2 miles away. A rain day means at least a hundredth of an inch fell, the same measurable-precipitation mark the Weather Service uses. Source: computed from the station record, NOAA GHCN daily.
Grover Beach weather history, back to 1940
Pick any month back to 1940 and see what the archive holds for Grover Beach: the reanalysis record of what happened, day by day.
Reading this month last year to start you off.
Grover Beach weather records
In 32,291 days of observations Grover Beach has been as hot as 117F and as cold as 21F. Not averages: the actual days.
Hottest day
117F
September 6, 2020
Coldest night
21F
January 14, 2007
Wettest day
4.04 in
January 9, 2023
NOAA GHCN daily station records, observed 1998 to 2025: temperature at the San Luis Obispo Mcchesney Fld station, 8.2 miles away. Station measurements, not estimates. Record dates reflect the station's own observation schedule, and the official state record may live at a different station.
Common questions about Grover Beach weather
Common questions
What is the weather usually like in Grover Beach, CA?
Grover Beach is warmest in September, when the day usually reaches 80F, and coldest in January, when the night usually falls to 41F. Rain falls on roughly 54 days a year, most often in February. Averages are thirty-year normals, 1991 to 2020, computed from the nearest NOAA station's own daily record.
How much does it rain in Grover Beach, CA?
About 54 days a year see at least a hundredth of an inch, which is the Weather Service's measurable-precipitation mark. February is the wettest month with rain on about 10 of its days, and July the driest with about 0.
What is the hottest it has ever been in Grover Beach, CA?
The hottest day measured for Grover Beach reached 117F on September 6, 2020, and the coldest night 21F on January 14, 2007. Both are real NOAA station measurements from the GHCN daily archive, observed 1998 to 2025, at the San Luis Obispo Mcchesney Fld station. Not estimates, though the official state record may live at a different station.
Can I look up past weather for Grover Beach, CA?
Yes, and for free. The History tab on this page takes any month back to 1940 and shows every day of it: the high, the low, what fell, and that month's hottest and coldest day. No account and no payment.
Is the Grover Beach forecast on this page free, and does it track me?
It is free, carries no advertising, and needs no account. Nothing about a visitor leaves the device except the coordinates needed to fetch a forecast, and those are not stored against anyone.