Climate Ontario - California
| JanJa | FebFe | MarMa | AprAp | MayMa | JunJu | |
|---|---|---|---|---|---|---|
| Average high in ºF Av. high Hi | 65 | 66 | 70 | 74 | 79 | 85 |
| Average low in ºF Av. low Lo | 44 | 45 | 47 | 51 | 56 | 59 |
| Av. precipitation in inch Av. precip. Pre. | 3.31 | 3.39 | 2.32 | 0.94 | 0.30 | 0.12 |
| JulJu | AugAu | SepSe | OctOc | NovNo | DecDe | |
|---|---|---|---|---|---|---|
| Average high in ºF Av. high Hi | 92 | 94 | 89 | 81 | 73 | 66 |
| Average low in ºF Av. low Lo | 63 | 65 | 63 | 55 | 47 | 43 |
| Av. precipitation in inch Av. precip. Pre. | 0.09 | 0.13 | 0.27 | 0.64 | 1.21 | 2.32 |
What is the average weather in Ontario, California?
Ontario experiences a hot-summer climate with dry summers and wetter winters. Summers are hot, while winters are cool. The area receives low annual precipitation, with frequent rain or drizzle common during the cooler season, though summers are notably dry.
Ontario Climate Graph - California Climate Chart
Daily normals Ontario - California - January
Day | High ºF | Low ºF | Prec/mo inch | Prec/yr inch | Snow/mo inch | Snow/yr inch |
|---|---|---|---|---|---|---|
| 1 Jan | 66.9 | 43.8 | 0.09 | 0.09 | 0.00 | 0.00 |
| 2 Jan | 67.0 | 43.9 | 0.19 | 0.19 | 0.00 | 0.00 |
| 3 Jan | 67.1 | 43.9 | 0.28 | 0.28 | 0.00 | 0.00 |
| 4 Jan | 67.2 | 44.0 | 0.37 | 0.37 | 0.00 | 0.00 |
| 5 Jan | 67.3 | 44.1 | 0.46 | 0.46 | 0.00 | 0.00 |
| 6 Jan | 67.4 | 44.1 | 0.54 | 0.54 | 0.00 | 0.00 |
| 7 Jan | 67.5 | 44.2 | 0.63 | 0.63 | 0.00 | 0.00 |
| 8 Jan | 67.6 | 44.3 | 0.71 | 0.71 | 0.00 | 0.00 |
| 9 Jan | 67.6 | 44.3 | 0.80 | 0.80 | 0.00 | 0.00 |
| 10 Jan | 67.7 | 44.4 | 0.89 | 0.89 | 0.00 | 0.00 |
| 11 Jan | 67.8 | 44.5 | 0.97 | 0.97 | 0.00 | 0.00 |
| 12 Jan | 67.8 | 44.5 | 1.06 | 1.06 | 0.00 | 0.00 |
| 13 Jan | 67.9 | 44.6 | 1.15 | 1.15 | 0.00 | 0.00 |
| 14 Jan | 67.9 | 44.6 | 1.24 | 1.24 | 0.00 | 0.00 |
| 15 Jan | 67.9 | 44.6 | 1.32 | 1.32 | 0.00 | 0.00 |
| 16 Jan | 68.0 | 44.7 | 1.41 | 1.41 | 0.00 | 0.00 |
| 17 Jan | 68.0 | 44.7 | 1.49 | 1.49 | 0.00 | 0.00 |
| 18 Jan | 68.0 | 44.8 | 1.58 | 1.58 | 0.00 | 0.00 |
| 19 Jan | 68.0 | 44.8 | 1.66 | 1.66 | 0.00 | 0.00 |
| 20 Jan | 68.0 | 44.8 | 1.75 | 1.75 | 0.00 | 0.00 |
| 21 Jan | 68.0 | 44.9 | 1.83 | 1.83 | 0.00 | 0.00 |
| 22 Jan | 67.9 | 44.9 | 1.91 | 1.91 | 0.00 | 0.00 |
| 23 Jan | 67.9 | 44.9 | 1.99 | 1.99 | 0.00 | 0.00 |
| 24 Jan | 67.9 | 44.9 | 2.06 | 2.06 | 0.00 | 0.00 |
| 25 Jan | 67.9 | 45.0 | 2.13 | 2.13 | 0.00 | 0.00 |
| 26 Jan | 67.8 | 45.0 | 2.19 | 2.19 | 0.00 | 0.00 |
| 27 Jan | 67.8 | 45.0 | 2.25 | 2.25 | 0.00 | 0.00 |
| 28 Jan | 67.8 | 45.1 | 2.32 | 2.32 | 0.00 | 0.00 |
| 29 Jan | 67.7 | 45.1 | 2.40 | 2.40 | 0.00 | 0.00 |
| 30 Jan | 67.7 | 45.1 | 2.48 | 2.48 | 0.00 | 0.00 |
| 31 Jan | 67.7 | 45.2 | 2.57 | 2.57 | 0.00 | 0.00 |
Weather history Ontario - September 2026
| Day | High ºF | Low ºF | Precip. inch | Snow inch | Snow d. inch |
|---|---|---|---|---|---|
| 01 Sep | 90.0 | 64.0 | 0.00 | - | - |
| 02 Sep | 88.0 | 63.0 | 0.00 | - | - |
| 03 Sep | 86.0 | 63.0 | 0.00 | - | - |
| 04 Sep | 88.0 | 63.0 | 0.00 | - | - |
| 05 Sep | 95.0 | 63.0 | 0.00 | - | - |
| 06 Sep | 77.0 | 66.0 | 0.55 | - | - |
| 07 Sep | 89.1 | 72.0 | 0.01 | - | - |
| 08 Sep | 100.0 | 75.0 | T | - | - |
| 09 Sep | 109.0 | 80.1 | 0.00 | - | - |
| 10 Sep | 102.0 | 80.1 | 0.00 | - | - |
| 11 Sep | 97.0 | 75.9 | 0.00 | - | - |
| 12 Sep | 93.0 | 70.0 | 0.00 | - | - |
| 13 Sep | 90.0 | 69.1 | 0.00 | - | - |
| 14 Sep | - | - | - | - | - |
| 15 Sep | 86.0 | 64.9 | 0.00 | - | - |
| 16 Sep | 84.0 | 63.0 | 0.00 | - | - |
| 17 Sep | 82.9 | 64.9 | 0.00 | - | - |
| 18 Sep | 82.9 | 62.1 | 0.00 | - | - |
| 19 Sep | 86.0 | 61.0 | 0.00 | - | - |
| 20 Sep | - | - | - | - | - |
| 21 Sep | - | - | - | - | - |
| 22 Sep | - | - | - | - | - |
| 23 Sep | - | - | - | - | - |
| 24 Sep | - | - | - | - | - |
| 25 Sep | - | - | - | - | - |
| 26 Sep | - | - | - | - | - |
| 27 Sep | - | - | - | - | - |
| 28 Sep | - | - | - | - | - |
| 29 Sep | - | - | - | - | - |
| 30 Sep | - | - | - | - | - |
Past weather Ontario
| Sep 26 | Normal | ||
|---|---|---|---|
| Average high temperature Av. high temp. | 90.3 ºF | 65 ºF | |
| Average low temperature Av. low temp. | 67.8 ºF | 44 ºF | |
| Total precipitation Total precip. | 0.56 inch | 3.31 inch | |
| Total snowfall Total snowfall | - inch | 0 inch | |
| Highest max temperature Highest max temp. | 109.0 ºF | - | |
| Lowest max temperature Lowest max temp. | 77.0 ºF | - | |
| Highest min temperature Highest min temp. | 80.1 ºF | - | |
| Lowest min temperature Lowest min temp. | 61.0 ºF | - | |
Past weather September 2026 incomplete - Missing data
Geo Ontario - California
| Country | United States | |
|---|---|---|
| State | California | |
| County | - | |
| City | Ontario | |
| Zip Code | 91798 | |
| Longitude | -117.65 dec. degr. | |
| Latitude | 34.06 dec. degr. | |
| Altitude - Elevation | 1004ft | |
| ICAO | - | |
| IATA | - |
Date and Time Ontario - California
| Local Time | 08:09 PM | |
|---|---|---|
| Sunrise | 06:37 AM | |
| Sunset | 06:48 PM | |
| Day/Night | Night | |
| Timezone | Pacific Daylight Time | |
| Timezone DB | America - Los Angeles |
Map of Ontario - California
USGS National Map — Open interactive map
Ontario weather averages
| Annual high temperature | 78ºF |
| Annual low temperature | 53ºF |
| Average annual precip. | 15.04 inch |
Station Data
Monthly averages Ontario
Longitude: -117.651, Latitude: 34.0633
Average weather Ontario, CA - 91798
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, ...