# Ontario, CA weather forecast

Today in Ontario, Thu 29 Oct: high 73.8 °F, low 58.0 °F, the median of 9 free forecasts (7 for the low). Station: Ontario Intl (KONT). As of 2026-10-29T07:36Z.

| Day | High °F | Low °F | Source spread (highs) | Source spread (lows) | Forecasts | Rain chance | Rain in |
|---|---|---|---|---|---|---|---|
| Thu 29 Oct (rest of day) | 73.8 | 58.0 | 71.3–77.2 | 51.6–63.6 | 9 | 2% | 0.00 |
| Fri 30 Oct | 70.8 | 59.9 | 68.5–73.2 | 56.0–62.9 | 10 | 77% | 0.02 |
| Sat 31 Oct | 68.3 | 57.5 | 66.6–70.7 | 52.6–60.8 | 10 | 61% | 0.10 |
| Sun 1 Nov | 68.6 | 58.7 | 62.5–72.9 | 53.4–61.7 | 10 | 68% | 0.42 |
| Mon 2 Nov | 74.0 | 55.0 | 65.6–76.6 | 50.7–59.1 | 9 | 3% | 0.00 |
| Tue 3 Nov | 78.2 | 55.0 | 70.8–81.7 | 49.6–62.8 | 9 | 8% | 0.00 |
| Wed 4 Nov | 77.9 | 55.9 | 71.4–83.7 | 50.2–63.6 | 8 | 6% | 0.00 |

Rain today: rest of day 2% (n 2: ENS, GEFS members' share, raw), 0.00 in. October: ≈ 0.24 in expected rest of month (0.02–0.85).

Alerts: none (NWS).

Weather markets here: Kalshi rain. Station, rule and the number so far for each: https://groundhog.markets/p/ontario#markets (API: https://groundhog.markets/api/v1/markets?place=ontario).

Credits: NOAA/NWS (public domain); MET Norway, DWD, GeoNames (CC BY 4.0); ECCC (Open Licence); based on ECMWF data (CC BY 4.0; ECMWF accepts no liability); modified by groundhog. Full: groundhog.markets/credits
Page: https://groundhog.markets/p/ontario