Ontario weather in March: Ontario, California: normal highs, lows, rain and records for March
Ontario in March has a normal high of 72°F and a normal low of 49°F, a daily mean of 60°F, rising from 70°F on the 1st to 74°F by the 31st. Measurable precipitation falls on 5 days in a normal March, 1.64 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 22°C and low of 9°C, 42 mm of precipitation in March.
- 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 March?
The normal high is 72°F and the normal low 49°F, for a daily mean of 60.2°F. March is 3.1°F warmer than February and 3.2°F cooler than April. March is the 9th warmest month of the year in Ontario and the 4th wettest. Across the month the normal high rises 4°F, from 70°F on March 1 to 74°F on March 31. From one year to the next March's mean temperature typically moves about 3.1°F either way (NOAA's standard deviation), so roughly two Marchs in three average between 57°F and 63°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 22%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| March 1 | 70°F | 48°F | 22% | 14% |
| March 8 | 71°F | 48°F | 20% | 12% |
| March 15 | 72°F | 49°F | 18% | 11% |
| March 22 | 73°F | 49°F | 16% | 9% |
| March 31 | 74°F | 49°F | 14% | 7% |
Every day of March: normal high, low and chance of precipitation (warmest afternoon March 31, coldest night March 1)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| March 1 | 70°F | 48°F | 22% | 14% | 11 h 30 min |
| March 2 | 70°F | 48°F | 22% | 14% | 11 h 30 min |
| March 3 | 70°F | 48°F | 22% | 14% | 11 h 30 min |
| March 4 | 70°F | 48°F | 22% | 13% | 11 h 30 min |
| March 5 | 70°F | 48°F | 21% | 13% | 11 h 30 min |
| March 6 | 70°F | 48°F | 21% | 13% | 11 h 40 min |
| March 7 | 71°F | 48°F | 21% | 13% | 11 h 40 min |
| March 8 | 71°F | 48°F | 20% | 12% | 11 h 40 min |
| March 9 | 71°F | 48°F | 20% | 12% | 11 h 40 min |
| March 10 | 71°F | 49°F | 20% | 12% | 11 h 40 min |
| March 11 | 71°F | 49°F | 19% | 12% | 11 h 50 min |
| March 12 | 71°F | 49°F | 19% | 11% | 11 h 50 min |
| March 13 | 71°F | 49°F | 19% | 11% | 11 h 50 min |
| March 14 | 72°F | 49°F | 19% | 11% | 11 h 50 min |
| March 15 | 72°F | 49°F | 18% | 11% | 11 h 50 min |
| March 16 | 72°F | 49°F | 18% | 10% | 12 h |
| March 17 | 72°F | 49°F | 18% | 10% | 12 h |
| March 18 | 72°F | 49°F | 18% | 10% | 12 h |
| March 19 | 72°F | 49°F | 17% | 10% | 12 h |
| March 20 | 72°F | 49°F | 17% | 9% | 12 h 10 min |
| March 21 | 72°F | 49°F | 17% | 9% | 12 h 10 min |
| March 22 | 73°F | 49°F | 16% | 9% | 12 h 10 min |
| March 23 | 73°F | 49°F | 16% | 9% | 12 h 10 min |
| March 24 | 73°F | 49°F | 16% | 8% | 12 h 10 min |
| March 25 | 73°F | 49°F | 15% | 8% | 12 h 20 min |
| March 26 | 73°F | 49°F | 15% | 8% | 12 h 20 min |
| March 27 | 73°F | 49°F | 15% | 8% | 12 h 20 min |
| March 28 | 73°F | 49°F | 15% | 8% | 12 h 20 min |
| March 29 | 73°F | 49°F | 14% | 7% | 12 h 20 min |
| March 30 | 74°F | 49°F | 14% | 7% | 12 h 30 min |
| March 31 | 74°F | 49°F | 14% | 7% | 12 h 30 min |
- Normal high
- 72°FMarch average
- Normal low
- 49°FMarch average
- Precipitation
- 1.64 inmonth total
- Days with precipitation
- 50.01 inch or more
- Days at 90°F or more
- 1
- Daylight
- 11 h 30 min to 12 h 30 minMarch 1 to March 31
- Days at 70°F or more
- 17
- Days at 80°F or more
- 7
- Sunshine
- 89%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 March?
On a given March day the chance of 0.01 inch or more is 18% on average, highest around March 1 (22%). In all, 1.64 in falls on 5 days of a normal March.
In a normal March in Ontario, 1 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00003102.
What are the records for March in Ontario?
The warmest March temperature on this station's record (since 1998) is 100°F, on March 20, 2026; the coldest is 33°F, on March 12, 2006. The wettest March brought 7.81 in (2023).
The March mean against the 1991-2020 normal of 60.2°F: 2021 56.9°F (−3.3), 2022 61.6°F (+1.4), 2023 53.2°F (−7.0), 2024 56.5°F (−3.7), 2025 57.5°F (−2.7), 2026 71.0°F (+10.8). 2 of 6 ran warmer than normal.
| March | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 56.9°F | −3.3°F | 1.20 in |
| 2022 | 61.6°F | +1.4°F | 0.97 in |
| 2023 | 53.2°F | −7.0°F | 7.81 in |
| 2024 | 56.5°F | −3.7°F | 3.49 in |
| 2025 | 57.5°F | −2.7°F | 1.69 in |
| 2026 | 71.0°F | +10.8°F | 0.25 in |
Source: records: ACIS, station USW00003102; recent months: ACIS, station USW00003102. Records and recent months use complete months only.
How does March in Ontario compare across California?
Across the 219 places PlainClimate covers in California, March normal highs run from 43°F in Tahoma to 81°F in Brawley; Ontario's is 72°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.