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Occidental, CA Weather
Occidental, California sits at 38.4004, -122.9349. Its warmest month is August, when the day usually reaches 84F, and its coldest is January, when the night usually falls to 36F. January is the wettest, with rain on about 13 days. The hottest day in the station record is 115F on September 6, 2022, and the coldest night 14F on December 22, 1990. 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 Occidental weather
Occidental sits at 38.4004, -122.9349 and covers about 4.967 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 Occidental
Occidental is warmest in August, when the day usually reaches 84F, and coldest in January, when the night usually falls to 36F. January is the wettest month, with rain on about 13 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
59F
36F
13
February
63F
38F
12
March
67F
40F
11
April
71F
41F
7
May
76F
45F
4
June
82F
47F
2
July
83F
50F
0
August
84F
49F
1
September
84F
47F
2
October
79F
43F
4
November
68F
39F
9
December
58F
36F
13
Thirty-year normals, 1991 to 2020, computed from the daily record, measured at the Graton station 4.3 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.
Occidental weather history, back to 1940
Pick any month back to 1940 and see what the archive holds for Occidental: the reanalysis record of what happened, day by day.
Reading this month last year to start you off.
Occidental weather records
In 135,019 days of observations Occidental has been as hot as 115F and as cold as 14F. Not averages: the actual days.
Hottest day
115F
September 6, 2022
Coldest night
14F
December 22, 1990
Wettest day
6.95 in
February 4, 1937
NOAA GHCN daily station records, observed 1926 to 2026: temperature at the Graton station, 4.3 miles away; snowfall at the Occidental 1.8 Nw station, 1.7 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 Occidental weather
Common questions
What is the weather usually like in Occidental, CA?
Occidental is warmest in August, when the day usually reaches 84F, and coldest in January, when the night usually falls to 36F. Rain falls on roughly 78 days a year, most often in January. Averages are thirty-year normals, 1991 to 2020, computed from the nearest NOAA station's own daily record.
How much does it rain in Occidental, CA?
About 78 days a year see at least a hundredth of an inch, which is the Weather Service's measurable-precipitation mark. January is the wettest month with rain on about 13 of its days, and July the driest with about 0.
What is the hottest it has ever been in Occidental, CA?
The hottest day measured for Occidental reached 115F on September 6, 2022, and the coldest night 14F on December 22, 1990. Both are real NOAA station measurements from the GHCN daily archive, observed 1926 to 2026, at the Graton station. Not estimates, though the official state record may live at a different station.
Can I look up past weather for Occidental, 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 Occidental 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.