Now

67°

12%

7 mph

01:00

68°

10%

7 mph

02:00

69°

15%

6 mph

03:00

69°

11%

7 mph

04:00

69°

16%

6 mph

05:00

69°

11%

6 mph

06:00

68°

13%

6 mph

07:00

68°

25%

6 mph

08:00

72°

20%

6 mph

09:00

74°

21%

7 mph

10:00

73°

0.02 in

6 mph

11:00

73°

39%

5 mph

12:00

73°

39%

4 mph

13:00

73°

0.03 in

3 mph

14:00

74°

0.02 in

6 mph

15:00

76°

43%

10 mph

16:00

78°

37%

11 mph

17:00

78°

24%

11 mph

18:00

78°

15%

10 mph

19:00

77°

17%

10 mph

20:00

76°

11%

8 mph

21:00

71°

15%

7 mph

22:00

68°

26%

7 mph

23:00

67°

28%

9 mph

10-day forecast

Updated 12:58 AM

Sun · Today · 16 Aug Partly cloudy

78° 67° 0.10 in

Mon · Tomorrow · 17 Aug Sunny

82° 59° 5%

Tuesday · 18 Aug Sunny

83° 55° 3%

Wednesday · 19 Aug Sunny

79° 59° 0.01 in

Thursday · 20 Aug Sunny

84° 55° 2%

Friday · 21 Aug Partly cloudy

78° 60° 0.09 in

Saturday · 22 Aug Showers

69° 61° 0.29 in

Sunday · 23 Aug Sunny

83° 57° 8%

Monday · 24 Aug Sunny

90° 65° 6%

Tuesday · 25 Aug Sunny

82° 59° 7%

Details & indices

Wind

7 mph E

Gusts 13 mph

Humidity

72%

Dew point 59°

Pressure

30.03 inHg

Rising

UV index

7 — High

High today

Air Quality

Good

AQI 35 · US EPA

Allergy

Moderate

Mugwort

Visibility

6 mi

Clear view

Allergy — St. Thomas

🌿 Conditions right now

View all →

Birch

None

Grass

Moderate

Oak

None

Alder

None

Hazel

None

Mugwort

Moderate

Ragweed

None

Sun & moon

Sunrise6:32 AM

Sunset8:25 PM

Length of day13h 53m

Moonrise11:02 AM

Moonset10:05 PM

Moon phase🌒 Waxing Crescent · 14%

Next full moonAug 28 Sturgeon Moon

Latitude42.7736°N

Longitude-81.1804°E

Water temps nearby

View all →

No beaches within 50 miles

🌤️No rain expected in the next 90 minutes

Now+30+60+90 min

Minute-by-minute precip · HRRR nowcast

Daily planner

computed from today's forecast

Laundry day

Fair

Line-drying weather

Grilling

Fair

Fire up the grill

Running

Poor

Lace up outside

Patio

Fair

Dinner outdoors

Nearby places in {{REGION}}

Data sources · Sunday, August 16

Where the St. Thomas forecast comes from

This page blends NOAA/NWS model guidance with global ensembles for the 10-day outlook, air quality and alerts. Data refreshes every hour, current conditions every 15 minutes. Coordinates: 42.7736°N, -81.1804°.

NBM + global weather models

Updated: 12:58 AM

Weather in St. Thomas

St. Thomas's outlook: warmest day near 90° (Monday), coldest night about 55° (Tuesday). Models drop roughly 0.49 in of precipitation across the stretch — watch Saturday (91%). No active NWS alerts at the moment — quiet on the hazards front. Right now St. Thomas is about 4° cooler than nearby Pittsburgh. Longer view: four full seasons with serious winter and real summer heat.

St. Thomas, ON · Elev 761 ft · 42.77°N, 81.18°W · Ontario · Forecast computed for these exact coordinates

St. Thomas, ON Weather

Weather map — St. Thomas

Today · Sun 8/16

Overnight · Sun 8/16

Tomorrow · Mon 8/17

7-day trend

10-day forecast

Details & indices

🌿 Conditions right now

Sun & moon

Water temps nearby

Daily planner