When to go · Ontario, California
Ontario, California in January
Mixed month. Outside the best window (Mar–May, Sep–Nov). Across United States: Cold and snowy north and in the mountains; Florida, Hawaii and the desert Southwest are the picks.
Key facts
- Verdict
- Mixed
- Temperature
- 19°C (66°F)66°F (19°C) / 7°C (45°F)45°F (7°C)
- average high / low
- Rain days
- 5
- Crowds
- Low
- United States overall
- Prices
- Low
- United States overall
Verdict
Outside the best window (Mar–May, Sep–Nov). Across United States: Cold and snowy north and in the mountains; Florida, Hawaii and the desert Southwest are the picks.
Is another month better than January?
January is rated mixed. These months rate higher:
Weather in January
- Ontario, CaliforniaHighs around 19 °C (66 °F), lows around 7 °C (45 °F), rain on about 5 daysHighs around 66 °F (19 °C), lows around 45 °F (7 °C), rain on about 5 days
Crowds and prices
- Crowds · United States overall
- Low
- Prices · United States overall
- Low
United States overall: Cold and snowy north and in the mountains; Florida, Hawaii and the desert Southwest are the picks.
Compare two months
Weather, crowds and prices for any two months in Ontario, California, side by side.
Verdict
Jan: Mixed
Mar: Great (better)
Daytime high
Jan: 19 °C (66 °F)66 °F (19 °C)
Mar: 22 °C (72 °F)72 °F (22 °C)
Night low
Jan: 7 °C (45 °F)45 °F (7 °C)
Mar: 9 °C (48 °F)48 °F (9 °C)
Rain days
Jan: 5
Mar: 4 (better)
Crowds
Jan: Low
Mar: Medium
Prices
Jan: Low
Mar: Medium
Festivals listed
Jan: 0
Mar: 2
January: Outside the best window (Mar–May, Sep–Nov). Across United States: Cold and snowy north and in the mountains; Florida, Hawaii and the desert Southwest are the picks.
March: Inside Ontario, California's best window: Mar–May, Sep–Nov.
Ontario, California: figures are long-term averages from this guide, not a forecast.
What to pack
- A warm layer for the evenings