Climate Fullerton - California
| JanJa | FebFe | MarMa | AprAp | MayMa | JunJu | |
|---|---|---|---|---|---|---|
| Average high in ºF Av. high Hi | 68 | 68 | 70 | 73 | 75 | 78 |
| Average low in ºF Av. low Lo | 45 | 48 | 50 | 52 | 58 | 61 |
| Av. precipitation in inch Av. precip. Pre. | 3.03 | 3.25 | 2.16 | 0.87 | 0.25 | 0.09 |
| JulJu | AugAu | SepSe | OctOc | NovNo | DecDe | |
|---|---|---|---|---|---|---|
| Average high in ºF Av. high Hi | 83 | 85 | 84 | 78 | 72 | 67 |
| Average low in ºF Av. low Lo | 65 | 65 | 63 | 57 | 50 | 45 |
| Av. precipitation in inch Av. precip. Pre. | 0.04 | 0.05 | 0.24 | 0.75 | 1.10 | 2.05 |
What is the average weather in Fullerton, California?
Fullerton experiences a hot semi-arid climate, defined by low annual precipitation. Summers are warm and very dry, with rainfall scarce. Winters are mild and bring the area's wetter period, though precipitation remains generally low, often arriving in brief showers.
Fullerton Climate Graph - California Climate Chart
Daily normals Fullerton - California - January
Day | High ºF | Low ºF | Prec/mo inch | Prec/yr inch | Snow/mo inch | Snow/yr inch |
|---|---|---|---|---|---|---|
| 1 Jan | 68.3 | 45.6 | 0.10 | 0.10 | 0.00 | 0.00 |
| 2 Jan | 68.4 | 45.6 | 0.19 | 0.19 | 0.00 | 0.00 |
| 3 Jan | 68.4 | 45.7 | 0.28 | 0.28 | 0.00 | 0.00 |
| 4 Jan | 68.5 | 45.8 | 0.37 | 0.37 | 0.00 | 0.00 |
| 5 Jan | 68.6 | 45.8 | 0.46 | 0.46 | 0.00 | 0.00 |
| 6 Jan | 68.6 | 45.9 | 0.55 | 0.55 | 0.00 | 0.00 |
| 7 Jan | 68.7 | 46.0 | 0.64 | 0.64 | 0.00 | 0.00 |
| 8 Jan | 68.7 | 46.0 | 0.74 | 0.74 | 0.00 | 0.00 |
| 9 Jan | 68.8 | 46.1 | 0.83 | 0.83 | 0.00 | 0.00 |
| 10 Jan | 68.8 | 46.1 | 0.93 | 0.93 | 0.00 | 0.00 |
| 11 Jan | 68.9 | 46.2 | 1.02 | 1.02 | 0.00 | 0.00 |
| 12 Jan | 68.9 | 46.2 | 1.12 | 1.12 | 0.00 | 0.00 |
| 13 Jan | 68.9 | 46.3 | 1.22 | 1.22 | 0.00 | 0.00 |
| 14 Jan | 68.9 | 46.4 | 1.31 | 1.31 | 0.00 | 0.00 |
| 15 Jan | 69.0 | 46.4 | 1.40 | 1.40 | 0.00 | 0.00 |
| 16 Jan | 69.0 | 46.5 | 1.50 | 1.50 | 0.00 | 0.00 |
| 17 Jan | 69.0 | 46.5 | 1.59 | 1.59 | 0.00 | 0.00 |
| 18 Jan | 69.0 | 46.5 | 1.68 | 1.68 | 0.00 | 0.00 |
| 19 Jan | 69.0 | 46.6 | 1.78 | 1.78 | 0.00 | 0.00 |
| 20 Jan | 69.0 | 46.6 | 1.87 | 1.87 | 0.00 | 0.00 |
| 21 Jan | 69.0 | 46.7 | 1.96 | 1.96 | 0.00 | 0.00 |
| 22 Jan | 69.0 | 46.7 | 2.05 | 2.05 | 0.00 | 0.00 |
| 23 Jan | 68.9 | 46.7 | 2.15 | 2.15 | 0.00 | 0.00 |
| 24 Jan | 68.9 | 46.8 | 2.23 | 2.23 | 0.00 | 0.00 |
| 25 Jan | 68.9 | 46.8 | 2.32 | 2.32 | 0.00 | 0.00 |
| 26 Jan | 68.9 | 46.9 | 2.40 | 2.40 | 0.00 | 0.00 |
| 27 Jan | 68.9 | 46.9 | 2.48 | 2.48 | 0.00 | 0.00 |
| 28 Jan | 68.8 | 46.9 | 2.56 | 2.56 | 0.00 | 0.00 |
| 29 Jan | 68.8 | 47.0 | 2.66 | 2.66 | 0.00 | 0.00 |
| 30 Jan | 68.8 | 47.0 | 2.75 | 2.75 | 0.00 | 0.00 |
| 31 Jan | 68.8 | 47.1 | 2.85 | 2.85 | 0.00 | 0.00 |
Weather history Fullerton - September 2026
| Day | High ºF | Low ºF | Precip. inch | Snow inch | Snow d. inch |
|---|---|---|---|---|---|
| 01 Sep | 84.9 | 66.9 | 0.00 | - | - |
| 02 Sep | 82.9 | 63.0 | 0.00 | - | - |
| 03 Sep | 81.0 | 64.9 | 0.00 | - | - |
| 04 Sep | 82.0 | 64.9 | 0.00 | - | - |
| 05 Sep | 91.0 | 63.0 | 0.00 | - | - |
| 06 Sep | 77.0 | 66.9 | 0.87 | - | - |
| 07 Sep | 91.9 | 72.0 | 0.02 | - | - |
| 08 Sep | 98.1 | 73.0 | 0.00 | - | - |
| 09 Sep | 108.0 | 77.0 | 0.00 | - | - |
| 10 Sep | 95.0 | 75.9 | 0.00 | - | - |
| 11 Sep | 88.0 | 73.9 | 0.00 | - | - |
| 12 Sep | 84.9 | 72.0 | 0.00 | - | - |
| 13 Sep | 84.0 | 71.1 | 0.00 | - | - |
| 14 Sep | - | - | - | - | - |
| 15 Sep | 81.0 | 69.1 | 0.00 | - | - |
| 16 Sep | 80.1 | 68.0 | 0.00 | - | - |
| 17 Sep | - | - | - | - | - |
| 18 Sep | - | - | - | - | - |
| 19 Sep | - | - | - | - | - |
| 20 Sep | - | - | - | - | - |
| 21 Sep | - | - | - | - | - |
| 22 Sep | - | - | - | - | - |
| 23 Sep | - | - | - | - | - |
| 24 Sep | - | - | - | - | - |
| 25 Sep | - | - | - | - | - |
| 26 Sep | - | - | - | - | - |
| 27 Sep | - | - | - | - | - |
| 28 Sep | - | - | - | - | - |
| 29 Sep | - | - | - | - | - |
| 30 Sep | - | - | - | - | - |
Past weather Fullerton
| Sep 26 | Normal | ||
|---|---|---|---|
| Average high temperature Av. high temp. | 87.3 ºF | 68 ºF | |
| Average low temperature Av. low temp. | 69.4 ºF | 45 ºF | |
| Total precipitation Total precip. | 0.89 inch | 3.03 inch | |
| Total snowfall Total snowfall | - inch | 0 inch | |
| Highest max temperature Highest max temp. | 108.0 ºF | - | |
| Lowest max temperature Lowest max temp. | 77.0 ºF | - | |
| Highest min temperature Highest min temp. | 77.0 ºF | - | |
| Lowest min temperature Lowest min temp. | 63.0 ºF | - | |
Past weather September 2026 incomplete - Missing data
Geo Fullerton - California
| Country | United States | |
|---|---|---|
| State | California | |
| County | - | |
| City | Fullerton | |
| Zip Code | 92831 | |
| Longitude | -117.92 dec. degr. | |
| Latitude | 33.87 dec. degr. | |
| Altitude - Elevation | 164ft | |
| ICAO | - | |
| IATA | - |
Date and Time Fullerton - California
| Local Time | 06:51 AM | |
|---|---|---|
| Sunrise | 06:36 AM | |
| Sunset | 06:53 PM | |
| Day/Night | Day | |
| Timezone | Pacific Daylight Time | |
| Timezone DB | America - Los Angeles |
Map of Fullerton - California
USGS National Map — Open interactive map
Fullerton weather averages
| Annual high temperature | 75ºF |
| Annual low temperature | 55ºF |
| Average annual precip. | 13.88 inch |
Station Data
Monthly averages Fullerton
Longitude: -117.924, Latitude: 33.8704
Average weather Fullerton, CA - 92831
Monthly: 1991-2020 normals
History: 2015-2026
Abbreviations
Average precipitation in : Av. precipitation in
Jan: January, Feb: February, ...Jan: January, Feb: February, ...Ja: January, Fe: February, ...