Ontario, CA weather in June
June in Ontario: warm and dry. Highs 86°F, lows 60°F, rain is rare.
- Normal high
- 86°F
- Normal low
- 60°F
- Wet days
- 0
- 0.02 in total
- Muggy days
- 0
- dew point 65°F+
How June changes from start to finish
| June 1 | June 30 | |
|---|---|---|
| Normal high | 82°F | 91°F |
| Normal low | 58°F | 63°F |
| Chance of a wet day | 2% | 1% |
| Sunrise / sunset | 5:40 am / 7:56 pm | 5:42 am / 8:06 pm |
| Daylight | 14.3 h | 14.4 h |
Chance of a wet day: average for the first and last 7 days of the month. Times are local clock time (Pacific Time).
A typical June day
- 6 am61°Fdew point 54°F
- 9 am74°Fdew point 52°F
- Noon84°Fdew point 50°F
- 3 pm86°Fdew point 52°F
- 6 pm78°Fdew point 52°F
- 9 pm67°Fdew point 54°F
NOAA hourly normals (local standard time) from March AFB (26 mi away); average wind 6 mph; clear or few clouds in 81% of daytime hours, mostly cloudy or overcast in 14%.
What kind of days to expect
- Comfortable dayshigh 65-80°F and dew point under 60°F7 of 30
- Hot dayshigh 90°F or more11 of 30
- Muggy daysdaily mean dew point 65°F or more0 of 30
- Wet daysat least 0.01 in of rain or melted snow0 of 30
- Notable rainat least 0.10 in0 of 30
- Freezing nightslow 32°F or below0 of 30
Average days per June, counted from daily records for each year 1991-2020.
Rain in June
Normal precipitation is 0.02 in; a dry June brings about 0.0 in and a wet one about 0.01 in (25th and 75th percentiles). Days with half an inch or more are rare.
How June varies from year to year
- Warmest June, 1991-20202008: average high 91°F
- Coolest June1998: average high 79°F
- Wettest June1999: 0.3 in
- Driest June2000: no measurable precipitation
- Highest reading112°F (June 20, 2016)
- Lowest reading46°F (June 5, 1999)
From the station's daily records with NOAA quality flags removed; most recent date shown when a reading repeats.
June compared with May and July
| May | June | July | |
|---|---|---|---|
| Normal high | 80°F | 86°F | 94°F |
| Normal low | 56°F | 60°F | 65°F |
| Wet days | 2 | 0 | 1 |
| Comfortable days | 16 | 7 | 1 |
| Daylight | 13.9 h | 14.4 h | 14.2 h |
Highs change by +6°F from May and +8°F into July.
Nearby alternatives in June
- Warmer: Victorville, CA39 mi · high 91°F · 0 wet days
- Cooler: West Covina, CA16 mi · high 77°F · 2 wet days
How Ontario ranks in June
- Normal high144th warmest of 378 cities; 22nd of 60 in California
- Wet days11th driest of 378
- Comfortable days158th most of 340
What to pack for Ontario in June
- Light, breathable clothing – highs near 86°F
- Layers – afternoons near 86°F but nights near 60°F
- Sunglasses and sunscreen – about 14.4 hours of daylight and highs near 86°F
Heating and cooling
June has 4 heating degree days and 250 cooling degree days (base 65°F), 8% of the year's total heating and cooling demand.
Questions
How hot is Ontario in June?
The normal high is 86°F and the normal low is 60°F. From 1991 to 2020 the hottest June reading was 112°F (June 20, 2016).
Does it rain a lot in Ontario in June?
About 0 days in June have at least 0.01 in of precipitation, and the normal total is 0.02 in. The wettest June in 1991-2020 was in 1999 (0.3 in); the driest was in 2000, with no measurable precipitation.
Is June a good time to visit Ontario?
June ranks 8th of 12 months on our comfort score for Ontario (61 out of 100). It has about 7 comfortable days and about 11 days at 90°F or hotter. The best months are March, April and May.
Where the numbers come from
- Temperature, rain and frost dates: Ontario Intl Airport (USW00003102), 2.9 mi E of the city center, 949 ft (52 ft lower than the city). NOAA normals and daily records, 1991-2020.
- Snowfall and snow depth: San Gabriel Canyon PH (USC00047776), 16 mi WNW of the city center, 744 ft (257 ft lower than the city). NOAA normals and daily records, 1991-2020.
- Humidity and wind by hour and cloud cover: March AFB (USW00023119), 26 mi ESE of the city center, 1,516 ft (515 ft higher than the city). NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: March Air Reserve Base (722860-23119), 26 mi ESE of the city center, 1,536 ft (535 ft higher than the city). Hourly observations, 1991-2020.