Ontario weather in July: Ontario, California: normal highs, lows, rain and records for July
Ontario in July has a normal high of 94°F and a normal low of 65°F, a daily mean of 79°F, rising from 91°F on the 1st to 95°F by the 31st. Measurable precipitation falls on 1 days in a normal July, 0.05 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 34°C and low of 18°C, 1 mm of precipitation in July.
- NOAA stationOntario International Airport
- Station IDUSW00003102
- Location34.06°N 117.60°W
- Elevation949 ft (289 m)
- From the center1 miles
- Population185,285
- Jan 68° 45°
- Feb 68° 46°
- Mar 72° 49°
- Apr 76° 51°
- May 80° 56°
- Jun 86° 60°
- Jul 94° 65°
- Aug 95° 65°
- Sep 91° 64°
- Oct 83° 57°
- Nov 75° 49°
- Dec 67° 44°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Ontario in July?
The normal high is 94°F and the normal low 65°F, for a daily mean of 79.2°F. July is 6.0°F warmer than June and 0.9°F cooler than August. July is the 2nd warmest month of the year in Ontario and the 10th wettest. Across the month the normal high rises 4°F, from 91°F on July 1 to 95°F on July 31. From one year to the next July's mean temperature typically moves about 2.3°F either way (NOAA's standard deviation), so roughly two Julys in three average between 77°F and 82°F.
Bars above: each day's normal high to low. Columns below: the chance of 0.01 inch or more of precipitation that day, on a scale of 0 to 100% (highest 2%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| July 1 | 91°F | 63°F | 1% | 0% |
| July 8 | 93°F | 64°F | 1% | 0% |
| July 15 | 94°F | 65°F | 2% | 0% |
| July 22 | 95°F | 65°F | 2% | 0% |
| July 31 | 95°F | 65°F | 2% | 0% |
Every day of July: normal high, low and chance of precipitation (warmest afternoon July 26, coldest night July 1)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| July 1 | 91°F | 63°F | 1% | 0% | 14 h 20 min |
| July 2 | 92°F | 63°F | 1% | 0% | 14 h 20 min |
| July 3 | 92°F | 64°F | 1% | 0% | 14 h 20 min |
| July 4 | 92°F | 64°F | 1% | 0% | 14 h 20 min |
| July 5 | 93°F | 64°F | 1% | 0% | 14 h 20 min |
| July 6 | 93°F | 64°F | 1% | 0% | 14 h 20 min |
| July 7 | 93°F | 64°F | 1% | 0% | 14 h 20 min |
| July 8 | 93°F | 64°F | 1% | 0% | 14 h 20 min |
| July 9 | 93°F | 64°F | 1% | 0% | 14 h 20 min |
| July 10 | 94°F | 65°F | 1% | 0% | 14 h 20 min |
| July 11 | 94°F | 65°F | 1% | 0% | 14 h 20 min |
| July 12 | 94°F | 65°F | 2% | 0% | 14 h 20 min |
| July 13 | 94°F | 65°F | 2% | 0% | 14 h 20 min |
| July 14 | 94°F | 65°F | 2% | 0% | 14 h 10 min |
| July 15 | 94°F | 65°F | 2% | 0% | 14 h 10 min |
| July 16 | 94°F | 65°F | 2% | 0% | 14 h 10 min |
| July 17 | 94°F | 65°F | 2% | 0% | 14 h 10 min |
| July 18 | 94°F | 65°F | 2% | 0% | 14 h 10 min |
| July 19 | 94°F | 65°F | 2% | 0% | 14 h 10 min |
| July 20 | 95°F | 65°F | 2% | 0% | 14 h 10 min |
| July 21 | 95°F | 65°F | 2% | 0% | 14 h 10 min |
| July 22 | 95°F | 65°F | 2% | 0% | 14 h 10 min |
| July 23 | 95°F | 65°F | 2% | 0% | 14 h |
| July 24 | 95°F | 65°F | 2% | 0% | 14 h |
| July 25 | 95°F | 65°F | 2% | 0% | 14 h |
| July 26 | 95°F | 65°F | 2% | 0% | 14 h |
| July 27 | 95°F | 65°F | 2% | 0% | 14 h |
| July 28 | 95°F | 65°F | 2% | 0% | 14 h |
| July 29 | 95°F | 65°F | 2% | 0% | 14 h |
| July 30 | 95°F | 65°F | 2% | 0% | 13 h 50 min |
| July 31 | 95°F | 65°F | 2% | 0% | 13 h 50 min |
- Normal high
- 94°FJuly average
- Normal low
- 65°FJuly average
- Precipitation
- 0.05 inmonth total
- Days with precipitation
- 10.01 inch or more
- Days at 90°F or more
- 23
- Daylight
- 14 h 20 min to 13 h 50 minJuly 1 to July 31
- Days at 70°F or more
- 31
- Days at 80°F or more
- 31
- Sunshine
- 94%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00003102; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Ontario in July?
On a given July day the chance of 0.01 inch or more is 2% on average, highest around July 21 (2%). In all, 0.05 in falls on 1 days of a normal July.
In a normal July in Ontario, 23 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00003102.
What are the records for July in Ontario?
The warmest July temperature on this station's record (since 1998) is 117°F, on July 6, 2018; the coldest is 56°F, on July 22, 2001. The wettest July brought 0.60 in (2015).
The July mean against the 1991-2020 normal of 79.2°F: 2021 82.8°F (+3.6), 2022 78.7°F (−0.5), 2023 81.1°F (+1.9), 2024 81.5°F (+2.3), 2025 75.9°F (−3.3), 2026 81.1°F (+1.9). 4 of 6 ran warmer than normal.
| July | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 82.8°F | +3.6°F | 0.49 in |
| 2022 | 78.7°F | −0.5°F | 0.03 in |
| 2023 | 81.1°F | +1.9°F | 0.00 in |
| 2024 | 81.5°F | +2.3°F | 0.00 in |
| 2025 | 75.9°F | −3.3°F | 0.00 in |
| 2026 | 81.1°F | +1.9°F | 0.00 in |
Source: records: ACIS, station USW00003102; recent months: ACIS, station USW00003102. Records and recent months use complete months only.
How does July in Ontario compare across California?
Across the 219 places PlainClimate covers in California, July normal highs run from 62°F in Bodega to 111°F in Needles; Ontario's is 94°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.