The best times to visit Siuntio for ideal weather are

June 4th to September 30th

based on average temperature and humidity from NOAA (the National Oceanic and Atmospheric Administration). Read below for more weather and travel details.



Other Siuntio Travel Info

Weather in Siuntio


Average temperatures in Siuntio vary drastically. Considering humidity, temperatures feel cold for about half of the year and otherwise nice with a fair chance of precipitation about half of the year. The area is less temperate than some — in the 30th percentile for pleasant weather — compared to tourist destinations worldwide. Weeks with ideal weather are listed above. If you’re looking for the very warmest time to visit Siuntio, the hottest months are July, August, and then June. See average monthly temperatures below. The warmest time of year is generally late July where highs are regularly around 72.2°F (22.3°C) with temperatures rarely dropping below 60.9°F (16.1°C) at night.

Siuntio Temperatures (Fahrenheit)


Siuntio Temperatures (Celsius)


“Feels-Like” Temperatures

The way we experience weather isn’t all about temperature. Higher temperatures affect us much more at higher humidity, and colder temperatures feel piercing with high winds. Our perceived temperatures factor in humidity and wind chill to better represent how hot or cold the day feels to a person.

Siuntio Perceived Temperature (F)


Siuntio Perceived Temperature (C)



Average Siuntio Temperatures by Month

Daily highs (averaged for the month) usually give the best indication of the weather. A significantly lower mean and low generally just means it gets colder at night.

Show Fahrenheit

Month Avg. High (°F) Avg. Mean (°F) Avg. Low (°F)
Jan 30.6 26.5 22.1
Feb 29.2 25.2 20.6
Mar 35.8 31 25.9
Apr 44.5 38.6 33.9
May 54.5 48.2 43.2
Jun 63.1 56.7 51.9
Jul 70.2 64 59.1
Aug 68.3 62.6 57.9
Sep 60.1 55.4 51.2
Oct 49.7 45.8 42
Nov 42.3 39.1 35.8
Dec 35.8 32.4 28.6

Show Celsius

Month Avg. High (°C) Avg. Mean (°C) Avg. Low (°C)
Jan -0.8 -3.1 -5.5
Feb -1.6 -3.8 -6.3
Mar 2.1 -0.6 -3.4
Apr 6.9 3.7 1.1
May 12.5 9 6.2
Jun 17.3 13.7 11.1
Jul 21.2 17.8 15.1
Aug 20.2 17 14.4
Sep 15.6 13 10.7
Oct 9.8 7.7 5.6
Nov 5.7 3.9 2.1
Dec 2.1 0.2 -1.9



Precipitation (Rain or Snow)

If dry weather is what you’re after, the months with the lowest chance of significant precipitation in Siuntio are March, May, and then April. Note that we define “significant precipitation” as .1 inches or more in this section. The lowest chance of rain or snow occurs around early to mid March. For example, on the week of March 12th there are no days of precipitation on average. By contrast, it’s most likely to rain or snow in early to mid September with an average of 3 days of significant precipitation the week of September 10th.

When can you find snow in Siuntio? Weather stations report very large amounts of snow likely to be deepest around March, especially close to mid February. The best time to ski (if at all) in Siuntio is often around around December 17th when fresh powder is deepest. Please note that a value of 0 for snow in the graph below may either mean there was no snow, or that snow is unreported.

Chance of Precipitation

The graph below shows the % chance of rainy and snowy days in Siuntio.

Days with precipitation

Snow on the Ground

The graph below shows the average snow on the ground in Siuntio (in).

Snow depth

Average Rain and Snow by Month

Show Inches

Month Daily Chance of Rain Average Snow Depth (in) Total Precipitation (in)
Jan 19% 11.1 1.9
Feb 18% 18.3 1.4
Mar 14% 18.7 1.2
Apr 18% 8.9 1.5
May 16% 0 1.4
Jun 24% 0 2.7
Jul 19% 0 1.9
Aug 25% 0 2.9
Sep 31% 0 3.2
Oct 23% 1.1 2.9
Nov 29% 3.1 2.6
Dec 30% 9.5 3.2

Show Centimeters

Month Daily Chance of Rain Average Snow Depth (cm) Total Precipitation (cm)
Jan 19 28.2 4.8
Feb 18 46.5 3.6
Mar 14 47.5 3
Apr 18 22.6 3.8
May 16 0 3.6
Jun 24 0 6.9
Jul 19 0 4.8
Aug 25 0 7.4
Sep 31 0 8.1
Oct 23 2.8 7.4
Nov 29 7.9 6.6
Dec 30 24.1 8.1


Humidity and Wind

Siuntio has some extremely humid months, and high humidity throughout the year. The least humid month is April (74.5% relative humidity), and the most humid month is January (86.4%).

Wind in Siuntio is usually stronger than many places. The windiest month is December, followed by November and January. December’s average wind speed of around 15.4 knots (17.7 MPH or 28.5 KPH) is considered “a moderate breeze.” Maximum sustained winds (the highest speed for the day lasting more than a few moments) are at their highest in late November to early December where average top sustained speeds reach 24.1 knots, which is considered a strong breeze.

Relative Humidity (%)

The graph below shows the average % humidity by month in Siuntio.

Avg. Relative Humidity


The graph below shows wind speed (max and average) in knots.

Max Sustained Wind
Average Daily Wind

Average Wind Speeds

Show Wind Speeds

All wind speeds are in knots. 1 knot = 1.15 MPH or 1.85 KPH.

Month Avg. Wind Avg. Wind Feel Sustained High Wind High Wind Feel
Jan 13.8 Significant breeze 19.7 Strong breeze
Feb 11.9 Significant breeze 17.8 Strong breeze
Mar 12.1 Significant breeze 18.6 Strong breeze
Apr 11.2 Significant breeze 17.7 Strong breeze
May 11.2 Significant breeze 18 Strong breeze
Jun 10.9 Gentle breeze 17.6 Strong breeze
Jul 10.5 Gentle breeze 16.7 Strong breeze
Aug 11 Significant breeze 17 Strong breeze
Sep 12.2 Significant breeze 18.2 Strong breeze
Oct 13.2 Significant breeze 19.5 Strong breeze
Nov 14.4 Significant breeze 21.5 Strong breeze
Dec 15.4 Significant breeze 22.3 Very strong breeze

Show Relative Humidity by Month

Month Avg. Relative Humidity
Jan 86.4%
Feb 85.2%
Mar 78.4%
Apr 74.5%
May 74.6%
Jun 74.6%
Jul 77.3%
Aug 78.1%
Sep 80.3%
Oct 80.4%
Nov 86.1%
Dec 86.1%


Is it Safe to Travel to Siuntio?

Our best data indicates this area is generally safe. As of Oct 07, 2019 there are no travel advisories or warnings for Finland; exercise normal security precautions. Check this page for any recent changes or regions to avoid: Travel Advice and Advisories. This advisory was last updated on Aug 22, 2019.


The Busiest and Least Crowded Months

The busiest month for tourism in Siuntio, Finland is July, followed by June and January. Prices for hotels and flights will be most expensive during these months, though you can save if you purchase well in advance. Tourists are unlikely to visit Siuntio in December. Those willing to visit at these times will likely find it the least expensive month.

Estimated Tourism by Month


Most Popular Months to Visit

Tourists Seeking Accommodations

Tourism graph is based on Google searches for services used by tourists relative to the rest of the year. Tourism data for this area is somewhat extrapolated based on nearby areas. Displayed data is calculated relative to the peak, so a score of 50.6 in December means 50.6% of the tourists vs. July.



Overall Siuntio Travel Experience by Season

Spring (March through May)

Humidity and temperatures combine to make this season feel moderately cold. Highs range from 59.9°F (15.5°C) and 32.8°F (0.4°C) with warmer temperatures in the later months. Rain is somewhat common with 4 to 5 days of significant precipitation per month. Spring is the second busiest for tourism, which makes it a good time for those looking for things to do.

Summer (June through August)

The middle-year months have comfortably cool weather with high temperatures that are comfortable. These months see moderate precipitation with 6 to 8 days of precipitation per month. June – August is the busiest season for tourism in Siuntio, so lodging and other accommodations may cost more than usual.

Fall (September through November)

Fall daily highs range from 63.5°F (17.5°C) and 38.1°F (3.4°C), which will feel chilly given the humidity and wind. It rains or snows a significant amount: 7 to 9 days per month. Tourism is the slowest during these months due to the weather, so hotels may be affordably priced.

Winter (December through February)

Weather is far too cold this time of year in Siuntio to be enjoyable for warm weather travelers. The average high during this season is between 38.3°F (3.5°C) and 27.6°F (-2.4°C). On average, it rains or snows a fair amount: 5 to 9 times per month. These times of year are fairly slow with tourists.


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