Forecast and Conditions for Ontario, California

Updated: 10:21 AM PDT on May 17, 2008 Observed at Chino, California
Temperature	91.4 °F / 33.0 °C
Humidity	19%
Dew Point	43 °F / 6 °C
Wind	NNE at 0.0 mph / 0.0 km/h
Pressure	29.17 in / 987.7 hPa (Falling)
Conditions	Scattered Clouds
Visibility	10.0 miles / 16.1 kilometers
Clouds	Scattered Clouds (SCT) : 25000 ft / 7620 m
Yesterday's Maximum	100 °F / 37 °C
Yesterday's Minimum	64 °F / 17 °C
Normal high	80 °F / 26 °C
Normal low	53 °F / 11 °C
Record high	102 °F / 38 °C (1970)
Record low	42 °F / 5 °C (1981)
Yesterday's Heating Degree Days	0
Yesterday's Cooling Degree Days	17
Sunrise	05:47 AM (PDT)
Sunset	07:47 PM (PDT)
Moon Rise	06:00 PM (PDT)
Moon Set	04:03 AM (PDT)
Moon Phase

Special Weather Statement Statement as of 4:30 PM PDT on May 16, 2008

... Record breaking heat this weekend...

Strong high pressure aloft will build over Southern California this
weekend with record highs likely in many areas. Highs will soar
above 100 in the valleys and foothills... and exceed 110 in the lower
deserts. The coolest weather will be in the mountains above 6000
feet where highs will be in the 70s and 80s. The immediate coast may
also see some relief from afternoon sea breezes and a very shallow
marine layer.

People with outdoor activities this weekend should prepare for the
unseasonably hot weather. With afternoon temperatures in the inland
areas ranging from 95 to 105 degrees and humidities in the
teens... dehydration is a real threat. Regular water Intake will help
you stay hydrated. Wear loose fitting light weight clothing... and
take advantage of shade and air conditioning.

High temperatures forecast for Saturday and Sunday

Beaches... ... ... ... ... ... ... ... ... .70 to 80
coastal zones... ... ... ... ... ... ... .80 (coast) to 95 (inland)
inland valleys... ... ... ... ... ... ... 95 to 105
mountains below 6000 feet... ... ... .85 to 95
mountains above 6000 feet... ... ... .75 to 85
upper deserts... ... ... ... ... ... ... .93 to 103
lower deserts... ... ... ... ... ... ... .103 to 113

On Monday it will remain hot and dry in the inland
valleys... mountains and deserts. However... increasing onshore flow
will bring slight cooling to the coastal zones.

On Tuesday and Wednesday a trough of low pressure will bring cooler
weather to all areas.

Forecast as of 3:30 am PDT on May 17, 2008

	Today Mostly sunny. Highs 97 to 102. Light winds.
	Tonight Mostly clear. Lows 61 to 69. Winds west 15 mph in the evening becoming light.
	Sunday Mostly sunny. Highs 98 to 105. Light winds.
	Sunday Night Mostly clear. Lows 61 to 66. Winds west 15 mph in the evening becoming light.
	Monday Mostly sunny. Highs 92 to 100. Light winds becoming west 15 mph in the afternoon.
	Monday Night Mostly clear. Lows 57 to 64.
	Tuesday Mostly sunny. Highs 83 to 89.
	Tuesday Night Mostly clear. Lows 56 to 61.
	Wednesday Mostly sunny. Highs 78 to 83.
	Wednesday Night Mostly clear in the evening then areas of low clouds and fog. Lows 54 to 59.
	Thursday Patchy low clouds and fog in the morning then mostly sunny. Highs 74 to 81.
	Thursday Night Mostly clear in the evening...becoming partly cloudy. Lows 52 to 57.
	Friday Partly cloudy in the morning...becoming mostly sunny. Highs 73 to 78.