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St. Thomas ON Weather - Overcast
Overcast
51°F
Updated 3:38 am
Feels Like 46°F
Humidity 67%
Wind NNE 9 mph
Barometer  30.21 in
Visibility 6 mi
St. Thomas ON Weather - Overcast
Overcast
10°C
Updated 3:38 am
Feels Like 8°C
Humidity 67%
Wind NNE 14 km/h
Barometer  102.3 kPa
Visibility 10 km
St. Thomas, ON Weather and Current Conditionsst. thomas on weather forecast

St. Thomas, ON Weather Forecast

St. Thomas Ontario WeatherSt. Thomas, Ontario Weather Weather Forecast
14 day API forecast for St. Thomas, Ontario. Note. The 7-day weather forecast for St. Thomas, Ontario is the most reliable and accurate forecast. This model should only be used as a likely scenario. It is difficult to predict weather more than 7 days in advance.
St. Thomas, ON Weather Forecast Dated: 338 AM Sat Sep 26 2026
Expect a cool pattern with a mix of sun and clouds and occasional showers over the coming period. generally humid conditions and no major pressure swings will dominate.

Saturday, September 26, 2026

Mid-Morning
St. Thomas Weather - 2026-09-26 - Morning - Partly Cloudy
13°C 55°F
Partly Cloudy
Mid-Afternoon
St. Thomas Weather - 2026-09-26 - Afternoon - Sunny
22°C 72°F
Sunny
Early-Evening
St. Thomas Weather - 2026-09-26 - Evening - Partly Cloudy
18°C 64°F
Partly Cloudy
Pleasant near 22°C 72°F, partly cloudy in the morning, becoming sunny through the afternoon and evening, with steady humidity and barometric pressure falling. Winds turning from the NE to the NNE at 12 km/h 7 mph.

Sunday, September 27, 2026

Mid-Morning
St. Thomas Weather - 2026-09-27 - Morning - Sunny
14°C 57°F
Sunny
Mid-Afternoon
St. Thomas Weather - 2026-09-27 - Afternoon - Sunny
23°C 74°F
Sunny
Early-Evening
St. Thomas Weather - 2026-09-27 - Evening - Sunny
19°C 66°F
Sunny
Comfortable with temperatures reaching 23°C 74°F, sunny throughout the day, with steady humidity and steady pressure. Winds blowing from the NE at 19 km/h 12 mph.

Monday, September 28, 2026

Mid-Morning
St. Thomas Weather - 2026-09-28 - Morning - Sunny
13°C 55°F
Sunny
Mid-Afternoon
St. Thomas Weather - 2026-09-28 - Afternoon - Overcast
21°C 70°F
Overcast
Early-Evening
St. Thomas Weather - 2026-09-28 - Evening - Overcast
19°C 65°F
Overcast
Enjoyable around 21°C 70°F, sunny in the morning, becoming overcast through the afternoon and evening, with steady humidity and steady pressure. Winds moving from the NE to the E at 5 km/h 3 mph.

Tuesday, September 29, 2026

Mid-Morning
St. Thomas Weather - 2026-09-29 - Morning - Overcast
15°C 59°F
Overcast
Mid-Afternoon
St. Thomas Weather - 2026-09-29 - Afternoon - Sunny
22°C 71°F
Sunny
Early-Evening
St. Thomas Weather - 2026-09-29 - Evening - Cloudy
18°C 65°F
Cloudy
Mild temperatures up to 22°C 71°F, overcast in the morning, sunny in the afternoon, and cloudy this evening, with steady humidity and steady pressure. Winds swinging from the WSW to the SSW at 13 km/h 8 mph.

Wednesday, September 30, 2026

Mid-Morning
St. Thomas Weather - 2026-09-30 - Morning - Rain
14°C 57°F
Rain
Mid-Afternoon
St. Thomas Weather - 2026-09-30 - Afternoon - Scattered Showers
16°C 61°F
Scattered Showers
Early-Evening
St. Thomas Weather - 2026-09-30 - Evening - Scattered Showers
15°C 59°F
Scattered Showers
Refreshing around 16°C 61°F, scattered downpours possible, with steady humidity and barometric pressure rising. Winds blowing from the WSW at 11 km/h 7 mph.

Thursday, October 1, 2026

Mid-Morning
St. Thomas Weather - 2026-10-01 - Morning - Overcast
16°C 60°F
Overcast
Mid-Afternoon
St. Thomas Weather - 2026-10-01 - Afternoon - Overcast
19°C 66°F
Overcast
Early-Evening
St. Thomas Weather - 2026-10-01 - Evening - Overcast
22°C 71°F
Overcast
Mildly cool near 19°C 66°F, overcast throughout the day, with lower humidity and steady pressure. Winds turning from the SE to the SSW at 21 km/h 13 mph. Gusts up to 49 km/h 30 mph.

Friday, October 2, 2026

Mid-Morning
St. Thomas Weather - 2026-10-02 - Morning - Overcast
21°C 69°F
Overcast
Mid-Afternoon
St. Thomas Weather - 2026-10-02 - Afternoon - Light Rain
18°C 64°F
Light Rain
Early-Evening
St. Thomas Weather - 2026-10-02 - Evening - Light Rain
16°C 61°F
Light Rain
Comfortable at 18°C 64°F, drier morning followed by showers lasting through evening, with increasing humidity and steady pressure. Winds out of the WSW at 21 km/h 13 mph.

Saturday, October 3, 2026

Mid-Morning
St. Thomas Weather - 2026-10-03 - Morning - Overcast
13°C 56°F
Overcast
Mid-Afternoon
St. Thomas Weather - 2026-10-03 - Afternoon - Overcast
19°C 66°F
Overcast
Early-Evening
St. Thomas Weather - 2026-10-03 - Evening - Overcast
20°C 67°F
Overcast
Cool with a high near 19°C 66°F, overcast throughout the day, with steady humidity and barometric pressure falling. Winds moving from the E to the SE at 17 km/h 11 mph. Gusts up to 33 km/h 20 mph.

Sunday, October 4, 2026

Mid-Morning
St. Thomas Weather - 2026-10-04 - Morning - Light Showers
18°C 64°F
Light Showers
Mid-Afternoon
St. Thomas Weather - 2026-10-04 - Afternoon - Sunny
14°C 58°F
Sunny
Early-Evening
St. Thomas Weather - 2026-10-04 - Evening - Sunny
12°C 54°F
Sunny
Refreshing around 14°C 58°F, morning showers, giving way to clearing skies, with lower humidity and barometric pressure rising. Winds swinging from the SSW to the NNW at 24 km/h 15 mph. Gusts up to 42 km/h 26 mph.

Monday, October 5, 2026

Mid-Morning
St. Thomas Weather - 2026-10-05 - Morning - Scattered Showers
10°C 49°F
Scattered Showers
Mid-Afternoon
St. Thomas Weather - 2026-10-05 - Afternoon - Overcast
11°C 52°F
Overcast
Early-Evening
St. Thomas Weather - 2026-10-05 - Evening - Scattered Showers
9°C 48°F
Scattered Showers
Cool and brisk at 11°C 52°F, periods of heavy rain and gusty conditions, with increasing humidity and steady pressure. Winds out of the WNW at 23 km/h 14 mph.

Tuesday, October 6, 2026

Mid-Morning
St. Thomas Weather - 2026-10-06 - Morning - Light Sleet Showers
3°C 37°F
Light Sleet Showers
Mid-Afternoon
St. Thomas Weather - 2026-10-06 - Afternoon - Scattered Showers
7°C 44°F
Scattered Showers
Early-Evening
St. Thomas Weather - 2026-10-06 - Evening - Scattered Showers
6°C 43°F
Scattered Showers
Biting cold near 7°C 44°F, locally heavy sleet at times, with lower humidity and steady pressure. Winds turning from the WNW to the N at 14 km/h 9 mph.

Wednesday, October 7, 2026

Mid-Morning
St. Thomas Weather - 2026-10-07 - Morning - Scattered Showers
2°C 36°F
Scattered Showers
Mid-Afternoon
St. Thomas Weather - 2026-10-07 - Afternoon - Light Showers
6°C 44°F
Light Showers
Early-Evening
St. Thomas Weather - 2026-10-07 - Evening - Light Showers
4°C 39°F
Light Showers
Cold with a high near 6°C 44°F, locally heavy downpours at times, with lower humidity and steady pressure. Winds increasing from the SW at 1 km/h 1 mph to N at 17 km/h 11 mph.

Thursday, October 8, 2026

Mid-Morning
St. Thomas Weather - 2026-10-08 - Morning - Sunny
2°C 35°F
Sunny
Mid-Afternoon
St. Thomas Weather - 2026-10-08 - Afternoon - Sunny
8°C 46°F
Sunny
Early-Evening
St. Thomas Weather - 2026-10-08 - Evening - Sunny
5°C 42°F
Sunny
Brisk around 8°C 46°F, sunny in the morning, cloudy in the afternoon, and partly cloudy this evening, with lower humidity and steady pressure. Winds moving from the NNW to the W at 9 km/h 6 mph.

Friday, October 9, 2026

Mid-Morning
St. Thomas Weather - 2026-10-09 - Morning - Scattered Showers
6°C 42°F
Scattered Showers
Mid-Afternoon
St. Thomas Weather - 2026-10-09 - Afternoon - Scattered Showers
7°C 45°F
Scattered Showers
Early-Evening
St. Thomas Weather - 2026-10-09 - Evening - Scattered Showers
7°C 45°F
Scattered Showers
Cool and brisk at 7°C 45°F, scattered downpours possible, with increasing humidity and steady pressure. Winds swinging from the SW to the WNW at 17 km/h 11 mph.

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Weather by the Numbers

Sat, 26th
St. Thomas ON Weather - Saturday, Sep 26, 2026 - Sunny
Hi: 22°C 72°F
Lo: 10°C 51°F
Sunrise 07:17 AM
Sunset 07:15 PM
Wind NE 13 km/h8 mph
Dew Point 2°C35°F
uv Index 4
Barometric Pressure 102.2 kPa30.18 in
POP 1% *
Humidity 31%
Sun, 27th
St. Thomas ON Weather - Sunday, Sep 27, 2026 - Partly Cloudy
Hi: 23°C 74°F
Lo: 11°C 51°F
Sunrise 07:18 AM
Sunset 07:13 PM
Wind NNE 19 km/h12 mph
Dew Point 4°C39°F
uv Index 4
Barometric Pressure 101.7 kPa30.03 in
POP 4% *
Humidity 32%
Mon, 28th
St. Thomas ON Weather - Monday, Sep 28, 2026 - Sunny
Hi: 21°C 70°F
Lo: 11°C 52°F
Sunrise 07:19 AM
Sunset 07:12 PM
Wind NE 12 km/h8 mph
Dew Point 9°C48°F
uv Index 4
Barometric Pressure 101.6 kPa30 in
POP 3% *
Humidity 51%
Tue, 29th
St. Thomas ON Weather - Tuesday, Sep 29, 2026 - Cloudy
Hi: 23°C 73°F
Lo: 14°C 58°F
Sunrise 07:20 AM
Sunset 07:10 PM
Wind SW 7 km/h4 mph
Dew Point 11°C52°F
uv Index 4
Barometric Pressure 101.6 kPa30 in
POP 10% *
Humidity 63%
Wed, 30th
St. Thomas ON Weather - Wednesday, Sep 30, 2026 - Moderate Rain
Hi: 18°C 64°F
Lo: 14°C 57°F
Sunrise 07:22 AM
Sunset 07:08 PM
Wind S 17 km/h11 mph
Dew Point 14°C57°F
uv Index 3
Barometric Pressure 101.3 kPa29.91 in
POP 91% *
Humidity 97%
Thu, 1st
St. Thomas ON Weather - Thursday, Oct 1, 2026 - Overcast
Hi: 22°C 72°F
Lo: 15°C 59°F
Sunrise 07:23 AM
Sunset 07:06 PM
Wind SSE 19 km/h12 mph
Dew Point 14°C57°F
uv Index 4
Barometric Pressure 101.6 kPa30 in
POP 26% *
Humidity 85%
Fri, 2nd
St. Thomas ON Weather - Friday, Oct 2, 2026 - Patchy Rain Nearby
Hi: 21°C 70°F
Lo: 15°C 59°F
Sunrise 07:24 AM
Sunset 07:04 PM
Wind SW 23 km/h14 mph
Dew Point 14°C57°F
uv Index 5
Barometric Pressure 101.3 kPa29.91 in
POP 17% *
Humidity 68%
Sat, 3rd
St. Thomas ON Weather - Saturday, Oct 3, 2026 - Patchy Rain Nearby
Hi: 21°C 69°F
Lo: 13°C 55°F
Sunrise 07:25 AM
Sunset 07:03 PM
Wind E 21 km/h13 mph
Dew Point 13°C56°F
uv Index 4
Barometric Pressure 101.7 kPa30.03 in
POP 27% *
Humidity 85%
Sun, 4th
St. Thomas ON Weather - Sunday, Oct 4, 2026 - Patchy Rain Nearby
Hi: 19°C 66°F
Lo: 10°C 49°F
Sunrise 07:26 AM
Sunset 07:01 PM
Wind WSW 23 km/h14 mph
Dew Point 16°C61°F
uv Index 4
Barometric Pressure 101.1 kPa29.85 in
POP 48% *
Humidity 95%
Mon, 5th
St. Thomas ON Weather - Monday, Oct 5, 2026 - Cloudy
Hi: 12°C 53°F
Lo: 7°C 45°F
Sunrise 07:27 AM
Sunset 06:59 PM
Wind NW 21 km/h13 mph
Dew Point 0°C33°F
uv Index 3
Barometric Pressure 102.3 kPa30.21 in
POP 7% *
Humidity 47%
Tue, 6th
St. Thomas ON Weather - Tuesday, Oct 6, 2026 - Patchy Rain Nearby
Hi: 7°C 45°F
Lo: 2°C 35°F
Sunrise 07:28 AM
Sunset 06:57 PM
Wind NNW 15 km/h10 mph
Dew Point 1°C34°F
uv Index 1
Barometric Pressure 102.6 kPa30.3 in
POP 58% *
Humidity 86%
Wed, 7th
St. Thomas ON Weather - Wednesday, Oct 7, 2026 - Light Rain Shower
Hi: 6°C 44°F
Lo: 1°C 35°F
Sunrise 07:30 AM
Sunset 06:56 PM
Wind SSE 5 km/h3 mph
Dew Point 1°C34°F
uv Index 1
Barometric Pressure 102.7 kPa30.33 in
POP 39% *
Humidity 82%
Thu, 8th
St. Thomas ON Weather - Thursday, Oct 8, 2026 - Patchy Rain Nearby
Hi: 8°C 46°F
Lo: -0°C 32°F
Sunrise 07:31 AM
Sunset 06:54 PM
Wind WNW 12 km/h7 mph
Dew Point -3°C26°F
uv Index 2
Barometric Pressure 102.8 kPa30.36 in
POP 4% *
Humidity 52%
Fri, 9th
St. Thomas ON Weather - Friday, Oct 9, 2026 - Patchy Rain Nearby
Hi: 8°C 46°F
Lo: 4°C 40°F
Sunrise 07:32 AM
Sunset 06:52 PM
Wind WSW 28 km/h18 mph
Dew Point -1°C30°F
uv Index 2
Barometric Pressure 101.9 kPa30.09 in
POP 13% *
Humidity 53%
* POP = Probability of Precipitation. Data for 12:00 PM.