St. Thomas monthly weather averages

Contents

Average daytime temperature

The bar chart below shows the average monthly peak daytime temperatures at St. Thomas

St. Thomas average temperature chart (Celsius) St. Thomas average temperature chart (Fahrenheit)
Average monthly temperatures in St. Thomas (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C -2.3 -1.4 4 11.2 17.9 22.7 25.6 24.7 20.8 14.3 7.4 0.6
°F 27.9 29.6 39.2 52.1 64.2 72.9 78.1 76.4 69.4 57.7 45.4 33.1

Please note: these are the average peak daytime temperatures (usually around mid-afternoon) so do not show daytime / night highs and lows. To see the daily range of temperatures have a look at the temperature max / min chart below.

Average rainfall & rainy days

The graph below shows the average rainfall and number of rainy days per month.

St. Thomas monthly rainfall chart (mm) St. Thomas monthly rainfall chart (inches)
Average monthly rainfall in St. Thomas (mm and inches)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
mm 71 55 80 83 72 88 74 94 81 66 90 94
inches 2.8 2.2 3.2 3.3 2.8 3.5 2.9 3.7 3.2 2.6 3.5 3.7
Rainy days 13 11 13 13 12 11 10 10 11 11 14 15

Average annual rainfall in St. Thomas: 907.4mm (357.2 inches)

Average daily sunshine

The bar chart below shows the average daily sunshine hours in St. Thomas

St. Thomas average daily sunshine chart
Average daily sunshine St. Thomas
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Hrs sunshine 2.8 3.9 4.5 6.4 8.3 9.3 9.6 8.3 6.2 4.9 2.9 2

Day / night temperatures

The graph below shows the daily range of temperatures for each month.

St. Thomas average minimum / maximum temperatures (Celsius) St. Thomas average minimum / maximum temperatures (Fahrenheit)
Maximum and minimum daily temperatures in St. Thomas (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Min °C -9.9 -9.7 -4 1.4 7.1 12 14.8 14.1 10.6 4.7 0.2 -6
Max °C -2.1 -1.2 4.2 11.4 18.2 23 25.9 25 21 14.5 7.6 0.8
Min °F 14.2 14.6 24.8 34.5 44.7 53.6 58.6 57.3 51.1 40.5 32.4 21.2
Max °F 21.2 22.3 32.2 43.5 54.7 63.5 68.5 67.1 60.4 49.3 39 27.3

Sea temperature

The graph below shows the average sea temperature.

St. Thomas average sea temperature chart (Celsius) St. Thomas average sea temperature chart (Fahrenheit)
Average sea temperature around St. Thomas in degrees centigrade and fahrenheit
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 2.5 1.6 1.7 3.8 8.8 15.7 21.4 22.6 20.2 14.9 9.4 4.9
°F 36.6 34.9 35 38.8 47.8 60.3 70.6 72.7 68.3 58.7 49 40.9

Wind speed

The graph below shows the average wind speed.

St. Thomas average winspeed by month (km/h) St. Thomas average winspeed by month (mph)
Average wind speed in St. Thomas (mph and kmh)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
km/h 18 17 17 17 14 13 12 11 12 14 17 17
mph 11 11 11 11 9 8 7 7 8 9 10 11

A monthly average windspeed of over 16km/h or 10mph suggests a location is fairly windy.

Relative humidity

The graph below shows the average relative humidity.

St. Thomas relative humidity averages
Average relative humidity in St. Thomas
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
79% 79% 76% 70% 69% 72% 72% 76% 78% 77% 80% 81%

Other monthly averages

UV index Best time to go?

Beta

Current (hourly) weather 15 day forecast

St. Thomas weather stats

St. Thomas weather statistics
Hottest month: July 25.6°C 78.1°F
Driest month: February 55mm 2.2ins
Sunniest month: July 9.6hrs
Coldest month: January -2.3°C 27.9°F
Wettest month: December 94mm 3.7ins
Warmest sea: August 22.6°C 72.7°F
Map showing location of St. Thomas (42.77361, -81.18038) St. Thomas map pin © Google

Top Canada locations