Ontario weather in April: Ontario, California: normal highs, lows, rain and records for April
Ontario in April has a normal high of 76°F and a normal low of 51°F, a daily mean of 63°F, rising from 74°F on the 1st to 78°F by the 30th. Measurable precipitation falls on 4 days in a normal April, 0.76 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 24°C and low of 11°C, 19 mm of precipitation in April.
- 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 April?
The normal high is 76°F and the normal low 51°F, for a daily mean of 63.4°F. April is 3.2°F warmer than March and 4.3°F cooler than May. April is the 7th warmest month of the year in Ontario and the 6th wettest. Across the month the normal high rises 4°F, from 74°F on April 1 to 78°F on April 30. From one year to the next April's mean temperature typically moves about 2.5°F either way (NOAA's standard deviation), so roughly two Aprils in three average between 61°F and 66°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 14%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| April 1 | 74°F | 50°F | 14% | 7% |
| April 8 | 75°F | 50°F | 13% | 6% |
| April 15 | 76°F | 51°F | 12% | 5% |
| April 22 | 77°F | 52°F | 10% | 5% |
| April 30 | 78°F | 53°F | 9% | 4% |
Every day of April: normal high, low and chance of precipitation (warmest afternoon April 30, coldest night April 1)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| April 1 | 74°F | 50°F | 14% | 7% | 12 h 30 min |
| April 2 | 74°F | 50°F | 14% | 7% | 12 h 30 min |
| April 3 | 74°F | 50°F | 14% | 7% | 12 h 40 min |
| April 4 | 74°F | 50°F | 13% | 7% | 12 h 40 min |
| April 5 | 74°F | 50°F | 13% | 7% | 12 h 40 min |
| April 6 | 74°F | 50°F | 13% | 7% | 12 h 40 min |
| April 7 | 74°F | 50°F | 13% | 6% | 12 h 40 min |
| April 8 | 75°F | 50°F | 13% | 6% | 12 h 50 min |
| April 9 | 75°F | 50°F | 13% | 6% | 12 h 50 min |
| April 10 | 75°F | 50°F | 13% | 6% | 12 h 50 min |
| April 11 | 75°F | 50°F | 12% | 6% | 12 h 50 min |
| April 12 | 75°F | 50°F | 12% | 6% | 12 h 50 min |
| April 13 | 75°F | 51°F | 12% | 6% | 13 h |
| April 14 | 75°F | 51°F | 12% | 6% | 13 h |
| April 15 | 76°F | 51°F | 12% | 5% | 13 h |
| April 16 | 76°F | 51°F | 11% | 5% | 13 h |
| April 17 | 76°F | 51°F | 11% | 5% | 13 h |
| April 18 | 76°F | 51°F | 11% | 5% | 13 h 10 min |
| April 19 | 76°F | 51°F | 11% | 5% | 13 h 10 min |
| April 20 | 76°F | 52°F | 11% | 5% | 13 h 10 min |
| April 21 | 77°F | 52°F | 11% | 5% | 13 h 10 min |
| April 22 | 77°F | 52°F | 10% | 5% | 13 h 10 min |
| April 23 | 77°F | 52°F | 10% | 5% | 13 h 20 min |
| April 24 | 77°F | 52°F | 10% | 5% | 13 h 20 min |
| April 25 | 77°F | 53°F | 10% | 5% | 13 h 20 min |
| April 26 | 77°F | 53°F | 10% | 5% | 13 h 20 min |
| April 27 | 77°F | 53°F | 10% | 5% | 13 h 20 min |
| April 28 | 78°F | 53°F | 9% | 4% | 13 h 30 min |
| April 29 | 78°F | 53°F | 9% | 4% | 13 h 30 min |
| April 30 | 78°F | 53°F | 9% | 4% | 13 h 30 min |
- Normal high
- 76°FApril average
- Normal low
- 51°FApril average
- Precipitation
- 0.76 inmonth total
- Days with precipitation
- 40.01 inch or more
- Days at 90°F or more
- 3
- Daylight
- 12 h 30 min to 13 h 30 minApril 1 to April 30
- Days at 70°F or more
- 20
- Days at 80°F or more
- 10
- Sunshine
- 90%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 April?
On a given April day the chance of 0.01 inch or more is 12% on average, highest around April 1 (14%). In all, 0.76 in falls on 4 days of a normal April.
In a normal April in Ontario, 3 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00003102.
What are the records for April in Ontario?
The warmest April temperature on this station's record (since 1998) is 101°F, on April 26, 2004; the coldest is 33°F, on April 10, 1999. The wettest April brought 3.46 in (2020).
The April mean against the 1991-2020 normal of 63.4°F: 2021 65.1°F (+1.7), 2022 65.2°F (+1.8), 2023 62.5°F (−0.9), 2024 61.2°F (−2.2), 2025 62.7°F (−0.7), 2026 65.6°F (+2.2). 3 of 6 ran warmer than normal.
| April | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 65.1°F | +1.7°F | 0.02 in |
| 2022 | 65.2°F | +1.8°F | 0.26 in |
| 2023 | 62.5°F | −0.9°F | 0.01 in |
| 2024 | 61.2°F | −2.2°F | 0.56 in |
| 2025 | 62.7°F | −0.7°F | 0.26 in |
| 2026 | 65.6°F | +2.2°F | 0.64 in |
Source: records: ACIS, station USW00003102; recent months: ACIS, station USW00003102. Records and recent months use complete months only.
How does April in Ontario compare across California?
Across the 219 places PlainClimate covers in California, April normal highs run from 49°F in Tahoma to 87°F in Brawley; Ontario's is 76°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.