Live Weather & Forecast
Weather in Ontario
California, United States · Real-time conditions & 3-day outlook
-2°C
Feels like -5°C
29°F / Feels 24°F
Clear
Ontario, California
🌙 Nighttime
Updated: 2026-04-12 00:45
Humidity
74%
Wind
10.8 km/h SSE
Wind Gust
22.2 km/h
Pressure
1021 mb
Visibility
10 km
UV Index
0
(Low)
Precipitation
0 mm
Cloud Cover
0%
Dew Point
-6°C
Wind Degree
162°
Air Quality Index
US EPA: Good
UK DEFRA: Low (1)
CO
161.8 μg/m³
NO₂
1.4 μg/m³
O₃
104 μg/m³
SO₂
1.1 μg/m³
PM 2.5
6.9 μg/m³
PM 10
8.1 μg/m³
Today's Hourly Forecast
24-hour breakdown for Ontario, California
12 AM
-1°
Clear
1 AM
-2°
Clear
2 AM
-1°
Clear
3 AM
-0°
Clear
4 AM
1°
Clear
5 AM
2°
Patchy rain nearby
6 AM
2°
Patchy light drizzle
7 AM
2°
Light rain
8 AM
3°
Light drizzle
9 AM
3°
Overcast
10 AM
3°
Overcast
11 AM
3°
Patchy rain nearby
12 PM
4°
Patchy rain nearby
1 PM
4°
Overcast
2 PM
3°
Overcast
3 PM
3°
Overcast
4 PM
3°
Overcast
5 PM
2°
Overcast
6 PM
2°
Overcast
7 PM
2°
Overcast
8 PM
2°
Moderate rain
9 PM
2°
Fog
10 PM
2°
Fog
11 PM
2°
Moderate rain
3-Day Forecast
Daily overview for Ontario, California
Today
Moderate rain
4°
/
-2°
🌧️ 82% chance of rain
💧 Avg. humidity: 91%
💨 Max wind: 22.3 km/h
🌧️ Total precip: 10.97 mm
☀️ UV Index: 0.2
🌅 Sunrise: 07:01 AM
🌇 Sunset: 08:37 PM
🌙 Waning Crescent
🌑 Moon: 33% lit
Mon, Apr 13
Overcast
5°
/
-1°
🌧️ 0% chance of rain
❄️ 3% chance of snow
💧 Avg. humidity: 89%
💨 Max wind: 12.2 km/h
🌧️ Total precip: 0.01 mm
☀️ UV Index: 0.6
🌅 Sunrise: 06:59 AM
🌇 Sunset: 08:38 PM
🌙 Waning Crescent
🌑 Moon: 23% lit
Tue, Apr 14
Moderate or heavy snow showers
1°
/
-2°
🌧️ 63% chance of rain
❄️ 42% chance of snow
💧 Avg. humidity: 87%
💨 Max wind: 15.8 km/h
🌧️ Total precip: 71.83 mm
☀️ UV Index: 0.4
🌅 Sunrise: 06:57 AM
🌇 Sunset: 08:40 PM
🌙 Waning Crescent
🌑 Moon: 15% lit
Best Time to Visit Ontario
Plan your trip to Ontario, United States around the most favorable weather conditions.
Peak Season
June – September
Warm, dry summers — ideal for outdoor activities.
Shoulder Season
April – May, October
Fewer crowds, moderate prices, mild weather.
Off Season
November – March
Cooler temperatures; some regions may experience rain or snow.
Frequently Asked Questions
People also ask — answers optimized for search engines and voice queries.
What is the current weather in Ontario?
Current conditions in Ontario: Clear, temperature -2°C, humidity 74%.
What is the best time to visit Ontario?
The best time to visit Ontario is typically June – September. Warm, dry summers — ideal for outdoor activities.
What is the climate like in Ontario?
Ontario is located at approximately 50° latitude. It has a temperate climate with warm summers and cold winters.
Does it rain a lot in Ontario?
The wettest period in Ontario is typically during November – March. Cooler temperatures; some regions may experience rain or snow.
What should I pack for a trip to Ontario?
For visits to Ontario during June – September: light clothing and sun protection. For November – March: layers and a waterproof jacket are recommended.
What country is Ontario in?
Ontario is located in United States, in the state of California.
What are the public holidays in Ontario in 2026?
View the 2026 public holidays for Ontario on our Holidays page.
What are the GPS coordinates used for the weather forecast in Ontario?
The weather forecast for Ontario uses coordinates 50.0007, -86.001.