Ontario, California · now
Clear
- High / Low
- — / 57°
- Wind
- 21 mph W
- Humidity
- 88%
Tomorrow· Wednesday77°/55°· Patchy Fog then Mostly Sunny
2° warmer than yesterday at this time
Current weather and 7-day forecast for Ontario, California, sourced directly from the National Weather Service. Expect patchy fog today.
Temperature · next 24 hours
Next 24 hours
-
5 AM
58°
6%
-
7 AM
58°
6%
-
9 AM
62°
6%
-
11 AM
67°
0%
-
1 PM
73°
0%
-
3 PM
76°
0%
-
5 PM
75°
0%
-
7 PM
72°
0%
-
9 PM
65°
0%
-
11 PM
61°
0%
-
1 AM
58°
0%
-
3 AM
56°
0%
Live radar
View full radar →7 days
- Today 5/13 Patchy Fog 6% — · 57°
- Wed 5/13 Patchy Fog then Mostly Sunny 6% 77° · 55°
- Thu 5/14 Patchy Fog then Sunny 0% 80° · 57°
- Fri 5/15 Sunny 0% 80° · 56°
- Sat 5/16 Patchy Fog then Sunny 0% 79° · 56°
- Sun 5/17 Sunny 1% 78° · 56°
- Mon 5/18 Sunny 0% 84° · 58°
Extended outlook days 8–17
- Tue 5/19
Cloudy 0% 78° · 59° - Wed 5/20 Cloudy 0% 81° · 62°
- Thu 5/21 Cloudy 3% 78° · 62°
- Fri 5/22 Cloudy 1% 74° · 61°
- Sat 5/23 Cloudy 4% 71° · 60°
- Sun 5/24 Cloudy 3% 76° · 59°
- Mon 5/25 Sunny 3% 82° · 61°
- Tue 5/26
Partly Cloudy 3% 90° · 64° - Wed 5/27 Cloudy 3% 97° · 71°
- Thu 5/28 Cloudy 3% 96° · 73°
Days 8+ from the Open-Meteo multi-model ensemble — treat as a guide; accuracy drops past day 7.
Best time to head outside
Picks the upcoming daytime hour with the most favorable conditions for each activity. Factors in temperature, wind, precipitation timing, and pollen.
- Run6 AM
comfortable at 57°F · calm wind · no rain expected · pollen high today — allergy sufferers, take note
Excellent100 / 100 - Bike9 AM
comfortable at 62°F · calm wind · no rain expected · pollen high today — allergy sufferers, take note
Excellent100 / 100 - Golf9 AM
comfortable at 62°F · calm wind · no rain expected · pollen high today — allergy sufferers, take note
Excellent100 / 100 - Picnic12 PM
comfortable at 70°F · calm wind · no rain expected · pollen high today — allergy sufferers, take note
Excellent100 / 100
Climate normals
What weather to expect in Ontario
Ontario in May typically averages 79° highs and 55° lows, with about 4 days of rain. The hottest stretch is August (average high 95°); the coldest is January (average low 46°). April is the wettest month on average.
| Month | Avg high | Avg low | Rainy days |
|---|---|---|---|
| Jan | 66° | 46° | 5 |
| Feb | 68° | 49° | 6 |
| Mar | 75° | 52° | 7 |
| Apr | 75° | 53° | 10 |
| May | 79° | 55° | 4 |
| Jun | 87° | 59° | 1 |
| Jul | 92° | 63° | 0 |
| Aug | 95° | 66° | 0 |
| Sep | 90° | 65° | 2 |
| Oct | 83° | 59° | 4 |
| Nov | 70° | 51° | 6 |
| Dec | 69° | 49° | 3 |
Normals derived from the past two years of observations via Open-Meteo's historical archive.
More for Ontario
Other cities in California