---
title: "10 Day Weather Forecast for St. Thomas, Ontario, CA"
description: "Get the latest 10 day weather forecast for St. Thomas, Ontario, CA. Stay prepared with accurate and up-to-date weather information to plan your week ahead."
location: "St. Thomas, Ontario, CA"
canonical: "https://www.weatherbug.com/weather-forecast/10-day-weather/st-thomas-ontario-ca-1"
coordinates: ["42.77361,-81.18038"]
temperature_units: "°F"
last_updated: "2026-05-28T19:01:00.0000000Z"
source: "WeatherBug"
---

# 10 Day Weather Forecast for St. Thomas, Ontario, CA

Get the latest 10-day weather forecast for St. Thomas, Ontario, CA, including day and night conditions, high and low temperatures, wind speed and direction and precipitation chances.
Forecast issued on 2026-05-28T19:01:00+00:00.

## 10 Day Weather Forecast

| Date       | Day Forecast                                     | Night Forecast                                 | High °F | Low °F |

| ---------- | ------------------------------------------------ |------------------------------------------------| -------: | -------: |

| Thu, May 28 | Sunny. High temperature around 71F. Dew point will be around 48F with an average humidity of 61%. Winds will be 11 mph from the N. | Clear. Low temperature around 47F. Dew point will be around 45F with an average humidity of 84%. Winds will be 5 mph from the N. | 71°F | 47°F |
| Fri, May 29 | Sunny. High temperature around 76F. Dew point will be around 47F with an average humidity of 66%. Winds will be 8 mph from the W. | Partly cloudy. Low temperature around 48F. Dew point will be around 44F with an average humidity of 60%. Winds will be 11 mph from the NE. | 76°F | 48°F |
| Sat, May 30 | Mostly sunny. High temperature around 67F. Dew point will be around 40F with an average humidity of 46%. Winds will be 9 mph from the NE. | Clear. Low temperature around 48F. Dew point will be around 42F with an average humidity of 63%. Winds will be 3 mph from the E. | 67°F | 48°F |
| Sun, May 31 | Sunny. High temperature around 71F. Dew point will be around 43F with an average humidity of 47%. Winds will be 4 mph from the SW. | Clear. Low temperature around 52F. Dew point will be around 43F with an average humidity of 58%. Winds will be 4 mph from the W. | 71°F | 52°F |
| Mon, Jun 1 | Mostly sunny. High temperature around 73F. Dew point will be around 44F with an average humidity of 45%. Winds will be 8 mph from the N. | Partly cloudy. Low temperature around 52F. Dew point will be around 42F with an average humidity of 57%. Winds will be 6 mph from the N. | 73°F | 52°F |
| Tue, Jun 2 | Partly cloudy. High temperature around 73F. Dew point will be around 42F with an average humidity of 43%. Winds will be 9 mph from the N. | Clear. Low temperature around 52F. Dew point will be around 43F with an average humidity of 57%. Winds will be 7 mph from the N. | 73°F | 52°F |
| Wed, Jun 3 | Sunny. High temperature around 74F. Dew point will be around 44F with an average humidity of 45%. Winds will be 5 mph from the SW. | Clear. Low temperature around 53F. Dew point will be around 45F with an average humidity of 59%. Winds will be 3 mph from the SW. | 74°F | 53°F |
| Thu, Jun 4 | Sunny. High temperature around 76F. Dew point will be around 48F with an average humidity of 48%. Winds will be 5 mph from the SW. | Mostly clear. Low temperature around 59F. Dew point will be around 51F with an average humidity of 63%. Winds will be 5 mph from the SW. | 76°F | 59°F |
| Fri, Jun 5 | Mostly sunny with a slight chance of rain. Chance of precipitation 30%. High temperature around 79F. Dew point will be around 55F with an average humidity of 57%. Winds will be 8 mph from the SW. | Partly cloudy with a chance of rain. Chance of precipitation 40%. Low temperature around 60F. Dew point will be around 56F with an average humidity of 71%. Winds will be 3 mph from the SW. | 79°F | 60°F |
| Sat, Jun 6 | Partly cloudy with a chance of rain. Chance of precipitation 40%. High temperature around 74F. Dew point will be around 56F with an average humidity of 64%. Winds will be 3 mph from the W. | Partly cloudy with a slight chance of rain. Chance of precipitation 25%. Low temperature around 57F. Dew point will be around 54F with an average humidity of 72%. Winds will be 4 mph from the N. | 74°F | 57°F |



## Source Information
- Source: "https://www.weatherbug.com/weather-forecast/10-day-weather/st-thomas-ontario-ca-1"
- Last Updated: "2026-05-28T19:01:00+00:00"