Ontario weather in July
In July, Ontario sees average daytime highs of 85°F and overnight lows near 64°F, with 0.1 in of rain across 0.5 wet days and about 14 hours of daylight. It is the 2nd-warmest and 11th-wettest month of the year here.
Day-to-day highs hold fairly steady near 85°F through the month. The sky is clear or mostly clear about 85% of the time in July, and the air most often feels comfortable.
Daylight stretches from about 14 h 12 min at the start of July to 13 h 42 min by month's end. Set against the rest of the year, July is Ontario's 3rd-clearest and 6th-windiest month. For the whole year in context, see Ontario's year-round climate.
- Daytime high
- 85°
- 2nd warmest
- Overnight low
- 64°
- 11th coldest
- Rainfall
- 0.1 in
- 0.5 wet days
- Daylight
- 14 h 06 min
- 4:54 AM – 6:58 PM
- Cloud cover
- 16%
- 3rd clearest
- Wind
- 3 mph
- 6th windiest
- Solar energy
- 7.9 kWh/m²
- Travel score
- 7.1
- out of 10
Ontario is city in San Bernardino County, California, United States.
- Density
- 1,322/km²
- people per km²
- Founded
- 1891
Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.
Temperature in July
Day-to-day highs hold fairly steady near 85°F through the month.
A typical July day in Ontario reaches about 85°F in the afternoon and slips back to 64°F overnight — a 21°F spread between the day's warmth and the night's chill. On most days the high lands between 79°F and 92°F. Set against its neighbours, July runs about 6°F warmer than June and about 2°F cooler than August.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°F) | 83 | 83 | 84 | 84 | 84 | 84 | 84 | 84 | 85 | 85 | 85 | 85 | 85 | 85 | 85 | 85 | 85 | 85 | 85 | 85 | 85 | 86 | 86 | 86 | 86 | 86 | 86 | 86 | 86 | 86 | 86 |
| Avg low (°F) | 62 | 62 | 62 | 63 | 63 | 63 | 63 | 63 | 63 | 64 | 64 | 64 | 64 | 64 | 64 | 64 | 64 | 64 | 64 | 64 | 64 | 65 | 65 | 65 | 65 | 65 | 65 | 65 | 65 | 65 | 65 |
| Avg high (°F) | Avg low (°F) | |
|---|---|---|
| 1 | 83 | 62 |
| 2 | 83 | 62 |
| 3 | 84 | 62 |
| 4 | 84 | 63 |
| 5 | 84 | 63 |
| 6 | 84 | 63 |
| 7 | 84 | 63 |
| 8 | 84 | 63 |
| 9 | 85 | 63 |
| 10 | 85 | 64 |
| 11 | 85 | 64 |
| 12 | 85 | 64 |
| 13 | 85 | 64 |
| 14 | 85 | 64 |
| 15 | 85 | 64 |
| 16 | 85 | 64 |
| 17 | 85 | 64 |
| 18 | 85 | 64 |
| 19 | 85 | 64 |
| 20 | 85 | 64 |
| 21 | 85 | 64 |
| 22 | 86 | 65 |
| 23 | 86 | 65 |
| 24 | 86 | 65 |
| 25 | 86 | 65 |
| 26 | 86 | 65 |
| 27 | 86 | 65 |
| 28 | 86 | 65 |
| 29 | 86 | 65 |
| 30 | 86 | 65 |
| 31 | 86 | 65 |
Ontario weather by month
How July compares with the rest of the year at a glance. July is the 2nd-warmest and 11th-wettest month here — the current month is highlighted below.
| Month | High / Low (°F) | Rainfall (inches) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 63° / 44° | 3.6 | 5.9 | 10 | 6.2 |
| Feb | 63° / 46° | 4.0 | 6.6 | 10.7 | 6.2 |
| Mar | 66° / 48° | 2.4 | 6.3 | 11.7 | 6.8 |
| Apr | 70° / 51° | 1.0 | 3.7 | 12.8 | 7.8 |
| May | 74° / 55° | 0.4 | 2.2 | 13.7 | 8.6 |
| Jun | 79° / 59° | 0.1 | 0.3 | 14.2 | 8.9 |
| Jul | 85° / 64° | 0.1 | 0.5 | 14 | 7.1 |
| Aug | 87° / 65° | 0.0 | 0.2 | 13.3 | 6.5 |
| Sep | 84° / 63° | 0.2 | 0.9 | 12.2 | 7.4 |
| Oct | 78° / 57° | 0.7 | 2.6 | 11.1 | 8.7 |
| Nov | 69° / 49° | 1.0 | 2.8 | 10.2 | 8.0 |
| Dec | 62° / 44° | 2.5 | 5.3 | 9.8 | 6.3 |
Cloud cover in July
The sky is clear or mostly clear about 85% of the time in July.
Beyond those clear spells, partly cloudy skies cover about 7% of July, with mostly cloudy or overcast conditions the remaining 8%.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 93 | 93 | 93 | 93 | 93 | 93 | 93 | 93 | 93 | 93 | 93 | 93 | 92 | 92 | 93 | 93 | 92 | 92 | 92 | 93 | 92 | 92 | 91 | 91 | 92 | 92 | 92 | 92 | 92 | 92 | 92 |
| Cloudier (%) | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 8 | 8 | 7 | 7 | 8 | 8 | 8 | 7 | 8 | 8 | 9 | 9 | 8 | 8 | 8 | 8 | 8 | 8 | 8 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 93 | 7 |
| 2 | 93 | 7 |
| 3 | 93 | 7 |
| 4 | 93 | 7 |
| 5 | 93 | 7 |
| 6 | 93 | 7 |
| 7 | 93 | 7 |
| 8 | 93 | 7 |
| 9 | 93 | 7 |
| 10 | 93 | 7 |
| 11 | 93 | 7 |
| 12 | 93 | 7 |
| 13 | 92 | 8 |
| 14 | 92 | 8 |
| 15 | 93 | 7 |
| 16 | 93 | 7 |
| 17 | 92 | 8 |
| 18 | 92 | 8 |
| 19 | 92 | 8 |
| 20 | 93 | 7 |
| 21 | 92 | 8 |
| 22 | 92 | 8 |
| 23 | 91 | 9 |
| 24 | 91 | 9 |
| 25 | 92 | 8 |
| 26 | 92 | 8 |
| 27 | 92 | 8 |
| 28 | 92 | 8 |
| 29 | 92 | 8 |
| 30 | 92 | 8 |
| 31 | 92 | 8 |
Chance of precipitation in July
Ontario gets around 0.1 in of rain over 0.5 wet days in July. The line is the day-by-day chance of measurable precipitation.
Day to day, the chance of measurable rain averages around 2% and peaks near 2% on the wettest days.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain chance (%) | 1 | 1 | 1 | 1 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| Rain chance (%) | |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 1 |
| 5 | 2 |
| 6 | 2 |
| 7 | 2 |
| 8 | 2 |
| 9 | 2 |
| 10 | 2 |
| 11 | 2 |
| 12 | 2 |
| 13 | 2 |
| 14 | 2 |
| 15 | 2 |
| 16 | 2 |
| 17 | 2 |
| 18 | 2 |
| 19 | 2 |
| 20 | 2 |
| 21 | 2 |
| 22 | 1 |
| 23 | 1 |
| 24 | 1 |
| 25 | 1 |
| 26 | 1 |
| 27 | 1 |
| 28 | 1 |
| 29 | 1 |
| 30 | 1 |
| 31 | 1 |
Humidity in July
Most of July feels comfortable — the stacked bands show each day's mix of comfort levels, read off the dew point.
By dew point, July lands in the comfortable band about 53% of days. It rarely turns muggy — the humid and sticky bands barely register.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dry (%) | 29 | 28 | 26 | 25 | 24 | 22 | 21 | 20 | 20 | 19 | 18 | 18 | 17 | 17 | 16 | 16 | 16 | 15 | 15 | 14 | 14 | 14 | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 14 | 14 |
| Comfortable (%) | 55 | 55 | 57 | 56 | 57 | 58 | 58 | 58 | 57 | 57 | 57 | 56 | 55 | 54 | 54 | 53 | 52 | 52 | 51 | 51 | 50 | 50 | 49 | 49 | 49 | 48 | 48 | 48 | 47 | 47 | 47 |
| Humid (%) | 14 | 15 | 15 | 16 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | 32 | 32 | 33 | 33 | 34 | 34 | 34 | 34 | 34 | 35 | 35 | 34 |
| Muggy (%) | 2 | 2 | 2 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 4 | 4 | 4 | 4 | 4 | 4 | 5 | 5 | 5 | 5 | 5 |
| Dry (%) | Comfortable (%) | Humid (%) | Muggy (%) | |
|---|---|---|---|---|
| 1 | 29 | 55 | 14 | 2 |
| 2 | 28 | 55 | 15 | 2 |
| 3 | 26 | 57 | 15 | 2 |
| 4 | 25 | 56 | 16 | 3 |
| 5 | 24 | 57 | 16 | 3 |
| 6 | 22 | 58 | 17 | 3 |
| 7 | 21 | 58 | 18 | 3 |
| 8 | 20 | 58 | 19 | 3 |
| 9 | 20 | 57 | 20 | 3 |
| 10 | 19 | 57 | 21 | 3 |
| 11 | 18 | 57 | 22 | 3 |
| 12 | 18 | 56 | 23 | 3 |
| 13 | 17 | 55 | 25 | 3 |
| 14 | 17 | 54 | 26 | 3 |
| 15 | 16 | 54 | 27 | 3 |
| 16 | 16 | 53 | 28 | 3 |
| 17 | 16 | 52 | 29 | 3 |
| 18 | 15 | 52 | 30 | 3 |
| 19 | 15 | 51 | 31 | 3 |
| 20 | 14 | 51 | 32 | 3 |
| 21 | 14 | 50 | 32 | 4 |
| 22 | 14 | 50 | 33 | 4 |
| 23 | 13 | 49 | 33 | 4 |
| 24 | 13 | 49 | 34 | 4 |
| 25 | 13 | 49 | 34 | 4 |
| 26 | 13 | 48 | 34 | 4 |
| 27 | 13 | 48 | 34 | 5 |
| 28 | 13 | 48 | 34 | 5 |
| 29 | 13 | 47 | 35 | 5 |
| 30 | 14 | 47 | 35 | 5 |
| 31 | 14 | 47 | 34 | 5 |
Wind in July
Winds average 3 mph in July.
Across July, daily wind ranges from about 3 mph on the calmest days to 3 mph at its breeziest. It stays fairly steady from day to day.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wind speed (mph) | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 |
| Feels | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm |
| Wind speed (mph) | Feels | |
|---|---|---|
| 1 | 3 | calm |
| 2 | 3 | calm |
| 3 | 3 | calm |
| 4 | 3 | calm |
| 5 | 3 | calm |
| 6 | 3 | calm |
| 7 | 3 | calm |
| 8 | 3 | calm |
| 9 | 3 | calm |
| 10 | 3 | calm |
| 11 | 3 | calm |
| 12 | 3 | calm |
| 13 | 3 | calm |
| 14 | 3 | calm |
| 15 | 3 | calm |
| 16 | 3 | calm |
| 17 | 3 | calm |
| 18 | 3 | calm |
| 19 | 3 | calm |
| 20 | 3 | calm |
| 21 | 3 | calm |
| 22 | 3 | calm |
| 23 | 3 | calm |
| 24 | 3 | calm |
| 25 | 3 | calm |
| 26 | 3 | calm |
| 27 | 3 | calm |
| 28 | 3 | calm |
| 29 | 3 | calm |
| 30 | 3 | calm |
| 31 | 3 | calm |
Sunrise & sunset in July
Daylight runs from about 14 h 12 min at the start of July to 13 h 42 min by month's end. The lit band spans sunrise to sunset each day.
Days shrink by about 30 minutes over July. Sunrise moves from 4:47 AM to 5:04 AM, and sunset from 7:01 PM to 6:49 PM.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 14.2 | 14.2 | 14.2 | 14.2 | 14.2 | 14.2 | 14.2 | 14.2 | 14.2 | 14.2 | 14.1 | 14.1 | 14.1 | 14.1 | 14.1 | 14.1 | 14.0 | 14.0 | 14.0 | 14.0 | 14.0 | 14.0 | 13.9 | 13.9 | 13.9 | 13.9 | 13.8 | 13.8 | 13.8 | 13.8 | 13.7 |
| Sunrise (AM) | 4:47 | 4:47 | 4:47 | 4:48 | 4:48 | 4:49 | 4:49 | 4:50 | 4:50 | 4:51 | 4:51 | 4:52 | 4:52 | 4:53 | 4:54 | 4:54 | 4:55 | 4:56 | 4:56 | 4:57 | 4:57 | 4:58 | 4:59 | 5:00 | 5:00 | 5:01 | 5:02 | 5:02 | 5:03 | 5:04 | 5:04 |
| Sunset (PM) | 7:01 | 7:01 | 7:01 | 7:01 | 7:01 | 7:01 | 7:01 | 7:01 | 7:00 | 7:00 | 7:00 | 7:00 | 6:59 | 6:59 | 6:59 | 6:58 | 6:58 | 6:57 | 6:57 | 6:56 | 6:56 | 6:55 | 6:55 | 6:54 | 6:53 | 6:53 | 6:52 | 6:51 | 6:51 | 6:50 | 6:49 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 14.2 | 4:47 | 7:01 |
| 2 | 14.2 | 4:47 | 7:01 |
| 3 | 14.2 | 4:47 | 7:01 |
| 4 | 14.2 | 4:48 | 7:01 |
| 5 | 14.2 | 4:48 | 7:01 |
| 6 | 14.2 | 4:49 | 7:01 |
| 7 | 14.2 | 4:49 | 7:01 |
| 8 | 14.2 | 4:50 | 7:01 |
| 9 | 14.2 | 4:50 | 7:00 |
| 10 | 14.2 | 4:51 | 7:00 |
| 11 | 14.1 | 4:51 | 7:00 |
| 12 | 14.1 | 4:52 | 7:00 |
| 13 | 14.1 | 4:52 | 6:59 |
| 14 | 14.1 | 4:53 | 6:59 |
| 15 | 14.1 | 4:54 | 6:59 |
| 16 | 14.1 | 4:54 | 6:58 |
| 17 | 14.0 | 4:55 | 6:58 |
| 18 | 14.0 | 4:56 | 6:57 |
| 19 | 14.0 | 4:56 | 6:57 |
| 20 | 14.0 | 4:57 | 6:56 |
| 21 | 14.0 | 4:57 | 6:56 |
| 22 | 14.0 | 4:58 | 6:55 |
| 23 | 13.9 | 4:59 | 6:55 |
| 24 | 13.9 | 5:00 | 6:54 |
| 25 | 13.9 | 5:00 | 6:53 |
| 26 | 13.9 | 5:01 | 6:53 |
| 27 | 13.8 | 5:02 | 6:52 |
| 28 | 13.8 | 5:02 | 6:51 |
| 29 | 13.8 | 5:03 | 6:51 |
| 30 | 13.8 | 5:04 | 6:50 |
| 31 | 13.7 | 5:04 | 6:49 |
Solar energy in July
Average shortwave solar energy reaching the ground each day in July, about 7.9 kWh/m².
For context, solar energy here swings from a low near 2.95 kWh/m² to a high of 8.05 kWh/m² in June across the year — July's 7.9 kWh/m² sits near the top of that range.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solar energy (kWh/m²) | 8.2 | 8.1 | 8.1 | 8.1 | 8.1 | 8.1 | 8.1 | 8.0 | 8.0 | 8.0 | 8.0 | 8.0 | 7.9 | 7.9 | 7.9 | 7.9 | 7.9 | 7.9 | 7.8 | 7.8 | 7.8 | 7.8 | 7.8 | 7.8 | 7.8 | 7.8 | 7.7 | 7.7 | 7.7 | 7.7 | 7.7 |
| Level | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| 1 | 8.2 | Intense |
| 2 | 8.1 | Intense |
| 3 | 8.1 | Intense |
| 4 | 8.1 | Intense |
| 5 | 8.1 | Intense |
| 6 | 8.1 | Intense |
| 7 | 8.1 | Intense |
| 8 | 8.0 | Intense |
| 9 | 8.0 | Intense |
| 10 | 8.0 | Intense |
| 11 | 8.0 | Intense |
| 12 | 8.0 | Intense |
| 13 | 7.9 | Intense |
| 14 | 7.9 | Intense |
| 15 | 7.9 | Intense |
| 16 | 7.9 | Intense |
| 17 | 7.9 | Intense |
| 18 | 7.9 | Intense |
| 19 | 7.8 | Intense |
| 20 | 7.8 | Intense |
| 21 | 7.8 | Intense |
| 22 | 7.8 | Intense |
| 23 | 7.8 | Intense |
| 24 | 7.8 | Intense |
| 25 | 7.8 | Intense |
| 26 | 7.8 | Intense |
| 27 | 7.7 | Intense |
| 28 | 7.7 | Intense |
| 29 | 7.7 | Intense |
| 30 | 7.7 | Intense |
| 31 | 7.7 | Intense |
Is July a good time to visit Ontario?
Our two travel scores rate July for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).
July is one of the better times to visit Ontario for general sightseeing. The water and warmth also suit a beach or pool day.
What to pack for Ontario in July
From July's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In July, Ontario sees daytime highs around 85°F and nights near 64°F. Pack light clothes and sun protection.
Sea temperature near Ontario in July
The nearest coast averages about 68°F in July — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea at the nearest coast (about 33 mi away) is warmest in August at about 69°F and coldest in February near 59°F.
It's comfortable for a long swim from Jul 13 to Sep 28 — about 2.6 months when the water holds above 68°F.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°F) | 59 | 59 | 59 | 60 | 63 | 65 | 68 | 69 | 69 | 67 | 64 | 60 |
| Comfort | Cool | Cool | Cool | Cool | Cool | Cool | Refreshing | Refreshing | Refreshing | Cool | Cool | Cool |
| Sea temperature (°F) | Comfort | |
|---|---|---|
| Jan | 59 | Cool |
| Feb | 59 | Cool |
| Mar | 59 | Cool |
| Apr | 60 | Cool |
| May | 63 | Cool |
| Jun | 65 | Cool |
| Jul | 68 | Refreshing |
| Aug | 69 | Refreshing |
| Sep | 69 | Refreshing |
| Oct | 67 | Cool |
| Nov | 64 | Cool |
| Dec | 60 | Cool |
UV index in Ontario in July
Clear-sky midday UV in July peaks around 11 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Ontario peaks around July 12 at about 11 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 16 at about 3 (moderate).
The index reaches 3 or more — the level where the WHO recommends sun protection — in 11 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 4 | 5 | 5 | 8 | 8 | 11 | 11 | 10 | 8 | 6 | 3 | 3 |
| Level | Moderate | Moderate | Moderate | Very high | Very high | Extreme | Extreme | Extreme | Very high | High | Moderate | Moderate |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 4 | Moderate |
| Feb | 5 | Moderate |
| Mar | 5 | Moderate |
| Apr | 8 | Very high |
| May | 8 | Very high |
| Jun | 11 | Extreme |
| Jul | 11 | Extreme |
| Aug | 10 | Extreme |
| Sep | 8 | Very high |
| Oct | 6 | High |
| Nov | 3 | Moderate |
| Dec | 3 | Moderate |
Air quality in Ontario in July
Average fine-particle pollution (PM2.5) through the year — so you can see where July falls, not just the annual average.
Air quality in Ontario is worst in September — around 49 µg/m³ PM2.5 (poor), about 4.0× the cleanest month (May, 12 µg/m³).
Modeled monthly averages (CAMS reanalysis, 2015–2024).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 18 | 19 | 19 | 17 | 12 | 17 | 19 | 32 | 49 | 21 | 21 | 18 |
| Level | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Poor | Moderate | Moderate | Moderate |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 18 | Moderate |
| Feb | 19 | Moderate |
| Mar | 19 | Moderate |
| Apr | 17 | Moderate |
| May | 12 | Moderate |
| Jun | 17 | Moderate |
| Jul | 19 | Moderate |
| Aug | 32 | Moderate |
| Sep | 49 | Poor |
| Oct | 21 | Moderate |
| Nov | 21 | Moderate |
| Dec | 18 | Moderate |
Where is Ontario?
Ontario sits at 34.1°N, 117.7°W, 1,004 ft above sea level, in United States. The nearest listed city is Upland, 2.5 mi away.
Topography around Ontario
How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Ontario.
Within 2 miles, the terrain around Ontario has only modest variations in elevation — a maximum elevation change of 354 ft around an average of 1,001 ft above sea level; within 10 miles, very significant variations in elevation — a maximum elevation change of 6,381 ft; within 50 miles, extreme variations in elevation — a maximum elevation change of 11,430 ft.
The land around Ontario is covered by artificial surfaces (87%) within 2 miles, artificial surfaces (58%) within 10 miles, and artificial surfaces (26%), shrubs (21%) and grassland (20%) within 50 miles.
United States travel facts
- Power plugs
- Type A / B
- 120 V · 60 Hz
- Prices
- ≈ 100% of US
- price level, 2025
- GDP per capita
- $90,027
- 2025
- Happiness
- 6.8 / 10
- World Happiness, 2025
- Safe drinking water
- 98%
- of population, 2024
- Homicide rate
- 5.8
- per 100k, 2023
- Road deaths
- 12.7
- per 100k/yr, 2019
- Income group
- High
- World Bank
- Religion
Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.
Data sources
Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Ontario (34.0633°, -117.6509°, elevation 1,004 ft), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).