Sis monthly weather averages
Average daytime temperature
The bar chart below shows the average monthly peak daytime temperatures at Sis
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| °C | 1.4 | 4 | 12 | 19.1 | 24.3 | 29 | 33.3 | 32.5 | 28.4 | 20.4 | 12.5 | 5 |
| °F | 34.6 | 39.2 | 53.5 | 66.5 | 75.7 | 84.3 | 92 | 90.5 | 83.2 | 68.8 | 54.5 | 41 |
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.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| mm | 19 | 22 | 29 | 35 | 43 | 25 | 11 | 9 | 11 | 26 | 21 | 20 |
| inches | 0.8 | 0.9 | 1.1 | 1.4 | 1.7 | 1 | 0.4 | 0.3 | 0.4 | 1 | 0.8 | 0.8 |
| Rainy days | 8 | 9 | 9 | 12 | 14 | 9 | 5 | 4 | 4 | 8 | 7 | 8 |
Average annual rainfall in Sis: 355mm (139.8 inches)
Average daily sunshine
The bar chart below shows the average daily sunshine hours in Sis
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Hrs sunshine | 3.7 | 4.5 | 5.9 | 6.7 | 8.4 | 10.7 | 11.8 | 11.5 | 10 | 7.4 | 5.2 | 3.6 |
Day / night temperatures
The graph below shows the daily range of temperatures for each month.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Min °C | -7.3 | -5.3 | 0.6 | 6.8 | 11 | 14.6 | 18.5 | 17.8 | 13 | 6.9 | 1.5 | -3.4 |
| Max °C | 1.7 | 4.3 | 12.3 | 19.5 | 24.6 | 29.4 | 33.7 | 32.9 | 28.8 | 20.8 | 12.8 | 5.2 |
| Min °F | 19 | 22.6 | 33 | 44.2 | 51.8 | 58.3 | 65.3 | 64 | 55.4 | 44.3 | 34.6 | 25.9 |
| Max °F | 27 | 31.1 | 43.5 | 55.6 | 64 | 71.6 | 79 | 77.5 | 69.6 | 56.8 | 44.8 | 33.6 |
Sea temperature
The graph below shows the average sea temperature.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| °C | 10.1 | 9 | 9.1 | 11.3 | 16.1 | 21.5 | 25 | 26.2 | 24.2 | 20.5 | 16.1 | 12.4 |
| °F | 50.2 | 48.2 | 48.5 | 52.4 | 60.9 | 70.7 | 77 | 79.1 | 75.6 | 68.9 | 61 | 54.4 |
Wind speed
The graph below shows the average wind speed.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| km/h | 2 | 4 | 5 | 7 | 7 | 7 | 7 | 7 | 5 | 4 | 2 | 2 |
| mph | 1 | 2 | 3 | 4 | 4 | 4 | 5 | 4 | 3 | 2 | 1 | 1 |
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.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 76% | 71% | 59% | 55% | 55% | 50% | 46% | 47% | 51% | 62% | 70% | 75% |
Other monthly averages
Sis weather stats
| Hottest month: | July | 33.3°C 91.9°F |
|---|---|---|
| Driest month: | August | 9mm 0.4ins |
| Sunniest month: | August | 11.5hrs |
| Coldest month: | January | 1.4°C 34.5°F |
| Wettest month: | May | 43mm 1.7ins |
| Warmest sea: | August | 26.2°C 79.2°F |
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