Rain observed over the last two hours by official weather radars around Ontario, followed by the radar forecast for the next hour where the weather service provides one.
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Rain radarLast two hours, then forecast where available · drag the timeline
Air you breathe in Ontario: pollution and pollen
1/6
Good
European Air Quality Index (EAQI), from Copernicus CAMS
PM2.52µg/m³
PM102µg/m³
Copernicus CAMS model, updated several times a day.
Ontario forecast in charts · next 7 days
The week ahead: highs and lows
▲ This week runs +4.4° warmer than usual
Highs Lows Usual for the season (1991–2020 average)
Hourly detail
Temperature (°C) Rain (mm) Wind (km/h)
Moon over Ontario
Waning crescent
12 % illuminated · 26.3 days
Rise 03:46 Set 15:15
Sat7/116%
Sun8/112%
Mon9/110%
Tue10/111%New moon
Wed11/113%
Thu12/118%
Fri13/1115%
Sat14/1123%
Sun15/1133%
Mon16/1143%
Tue17/1154%First quarter
Wed18/1164%
Moonrise and moonset in local time (America/Los_Angeles); phase and lit fraction from a synodic calculation.
Heights above chart datum. Coefficient: 20 for the weakest tides, 120 for the strongest.
Look up a past day in Ontario
Curious about the weather in Ontario on a given day? Choose a date: we read it from the ERA5 reanalysis (ECMWF / Copernicus C3S), which runs until about a week ago.
Ontario weather at a glance
This page gathers everything about the weather in Ontario, California: conditions now, the forecast for each part of the day and the trend for the coming week. At the moment the sky is “clear sky”, it is 22 °C (feels like 22 °C) and the wind blows at 3 km/h.
Expected range today: 12 °C to 27 °C and a dry sky. The forecast comes from the AtmoAtlas engine, which combines ECMWF-AIFS, NOAA GFS and DWD ICON, adjusts cloud cover with METAR reports and uses convective energy (CAPE) to flag storms, plus the tide times for Ontario.
Use the Ontario forecast in your own website or app: one JSON call returns weather, air quality, tides and sun and moon times. The free key needs no card.
