Live Weather & Forecast

Weather in Ontario

Oregon, United States · Real-time conditions & 3-day outlook

Flag of United States
Partly cloudy
8°C
Feels like 5°C
46°F / Feels 41°F
Partly cloudy
Ontario, Oregon
🌞 Daytime
Updated: 2026-04-16 15:45
💧
Humidity
43%
💨
Wind
15.8 km/h NW
🌬️
Wind Gust
18.2 km/h
🌡️
Pressure
1020 mb
👁️
Visibility
16 km
☀️
UV Index
3.6 (Moderate)
🌧️
Precipitation
0 mm
☁️
Cloud Cover
50%
💦
Dew Point
-1°C
🌐
Wind Degree
311°

Air Quality Index

US EPA: Good UK DEFRA: Low (1)
CO
214.9 μg/m³
NO₂
5.3 μg/m³
O₃
86 μg/m³
SO₂
1.3 μg/m³
PM 2.5
3.3 μg/m³
PM 10
4.3 μg/m³

Weather Alerts 2

Met · Moderate · Expected
Freeze Warning issued April 16 at 2:20AM MDT until April 17 at 10:00AM MDT by NWS Boise ID

* WHAT...Sub-freezing temperatures as low as 28 expected. * WHERE...Lower Treasure Valley Zones. * WHEN...From midnight MDT /11 PM PDT/ tonight to 10 AM MDT /9 AM PDT/ Friday. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing.

Take steps now to protect tender plants from the cold.

Effective: 2026-04-16T02:20:00-06:00  ·  Expires: 2026-04-16T15:15:00-06:00
Met · Moderate · Expected
Freeze Warning issued April 16 at 9:37AM MDT until April 17 at 10:00AM MDT by NWS Boise ID

* WHAT...Sub-freezing temperatures as low as 24 to 28 expected. * WHERE...Lower Treasure Valley Zones. * WHEN...From midnight MDT /11 PM PDT/ tonight to 10 AM MDT /9 AM PDT/ Friday. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing.

Take steps now to protect tender plants from the cold.

Effective: 2026-04-16T09:37:00-06:00  ·  Expires: 2026-04-16T17:45:00-06:00

Today's Hourly Forecast

24-hour breakdown for Ontario, Oregon

12 AM
Clear
3°
Clear
💧 75% 💨 15.5 km/h
1 AM
Clear
3°
Clear
💧 66% 💨 11.5 km/h
2 AM
Clear
2°
Clear
💧 65% 💨 14 km/h
3 AM
Clear
2°
Clear
💧 68% 💨 17.6 km/h
4 AM
Clear
1°
Clear
💧 66% 💨 17.6 km/h
5 AM
Clear
1°
Clear
💧 67% 💨 17.6 km/h
6 AM
Clear
1°
Clear
💧 77% 💨 16.2 km/h
7 AM
Clear
2°
Clear
💧 77% 💨 16.9 km/h
8 AM
Sunny
3°
Sunny
💧 67% 💨 13 km/h
9 AM
Sunny
4°
Sunny
💧 51% 💨 15.1 km/h
10 AM
Overcast
5°
Overcast
💧 47% 💨 16.6 km/h
11 AM
Sunny
6°
Sunny
💧 52% 💨 15.1 km/h
12 PM
Partly Cloudy
6°
Partly Cloudy
💧 50% 💨 14.4 km/h
1 PM
Partly Cloudy
7°
Partly Cloudy
💧 46% 💨 14.8 km/h
2 PM
Sunny
7°
Sunny
💧 54% 💨 15.8 km/h
3 PM
Partly cloudy
8°
Partly cloudy
💧 43% 💨 15.8 km/h
4 PM
Sunny
7°
Sunny
💧 62% 💨 19.8 km/h
5 PM
Sunny
8°
Sunny
💧 56% 💨 20.5 km/h
6 PM
Sunny
8°
Sunny
💧 59% 💨 24.1 km/h
7 PM
Sunny
6°
Sunny
💧 64% 💨 20.9 km/h
8 PM
Sunny
4°
Sunny
💧 78% 💨 14.8 km/h
9 PM
Clear
3°
Clear
💧 81% 💨 11.9 km/h
10 PM
Clear
2°
Clear
💧 78% 💨 8.6 km/h
11 PM
Clear
1°
Clear
💧 82% 💨 7.6 km/h

3-Day Forecast

Daily overview for Ontario, Oregon

Today
Sunny
Sunny
8° / 0°
🌧️ 0% chance of rain
💧 Avg. humidity: 64%
💨 Max wind: 24.1 km/h
🌧️ Total precip: 0 mm
☀️ UV Index: 1.1
🌅 Sunrise: 07:03 AM
🌇 Sunset: 08:33 PM
🌙 Waning Crescent
🌑 Moon: 3% lit
Fri, Apr 17
Sunny
Sunny
14° / -3°
🌧️ 0% chance of rain
💧 Avg. humidity: 59%
💨 Max wind: 11.2 km/h
🌧️ Total precip: 0 mm
☀️ UV Index: 1.5
🌅 Sunrise: 07:01 AM
🌇 Sunset: 08:35 PM
🌙 New Moon
🌑 Moon: 0% lit
Sat, Apr 18
Sunny
Sunny
17° / -3°
🌧️ 0% chance of rain
💧 Avg. humidity: 57%
💨 Max wind: 16.2 km/h
🌧️ Total precip: 0 mm
☀️ UV Index: 1.5
🌅 Sunrise: 07:00 AM
🌇 Sunset: 08:36 PM
🌙 Waxing Crescent
🌑 Moon: 1% 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.
← Back to Ontario 🗓 View Holidays 2026

Frequently Asked Questions

What is the current weather in Ontario?
Current conditions in Ontario: Partly cloudy, temperature 8°C, humidity 43%.
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 44° 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 Oregon.
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 44.0266, -116.9629.