The best times to visit Siero for ideal weather are
May 7th to November 4th
based on average temperature and humidity from NOAA (the National Oceanic and Atmospheric Administration). Read below for more weather and travel details.
Siero Travel Guide
Weather in Siero
Average temperatures in Siero vary somewhat. Considering humidity, temperatures feel cold for about half of the year and otherwise nice with a chance of rain or snow throughout most of the year. The area is somewhat temperate — in the 40th 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 Siero, the hottest months are August, July, and then September. See average monthly temperatures below. The warmest time of year is generally late July where highs are regularly around 75.2°F (24°C) with temperatures rarely dropping below 59°F (15°C) at night.
Siero Temperatures (Fahrenheit)
Siero Temperatures (Celsius)
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.
Siero Perceived Temperature (F)
Siero Perceived Temperature (C)
Average Siero 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.
|Month||Avg. High (°F)||Avg. Mean (°F)||Avg. Low (°F)|
|Month||Avg. High (°C)||Avg. Mean (°C)||Avg. Low (°C)|
Precipitation (Rain or Snow)
If dry weather is what you’re after, the months with the lowest chance of significant precipitation in Siero are July, September, and then August. Note that we define “significant precipitation” as .1 inches or more in this section. The lowest chance of rain or snow occurs around mid July. For example, on the week of July 16th there is 1 day of precipitation on average. By contrast, it’s most likely to rain or snow in late March with an average of 3 days of significant precipitation the week of March 26th.
When can you find snow in Siero? Weather stations report moderate or seasonal snow likely to be deepest around January, especially close to early to mid January. The best time to ski (if at all) in Siero is often around around January 8th 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.
The graph below shows the % chance of rainy and snowy days in Siero.
Snow on the Ground
The graph below shows the average snow on the ground in Siero (in).
Average Rain and Snow by Month
|Month||Daily Chance of Rain||Average Snow Depth (in)||Total Precipitation (in)|
|Month||Daily Chance of Rain||Average Snow Depth (cm)||Total Precipitation (cm)|
Humidity and Wind
Siero has some very humid months, and high humidity throughout the year. The least humid month is December (70.5% relative humidity), and the most humid month is June (76.6%).
Wind in Siero is usually extremely calm. The windiest month is February, followed by March and January. February’s average wind speed of around 4.8 knots (5.5 MPH or 8.9 KPH) is considered “a light breeze.” Maximum sustained winds (the highest speed for the day lasting more than a few moments) are at their highest in early February where average top sustained speeds reach 9.8 knots, which is considered a gentle breeze.
Relative Humidity (%)
The graph below shows the average % humidity by month in Siero.
The graph below shows wind speed (max and average) in knots.
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||4.1||Light breeze||7.4||Gentle breeze|
|Feb||4.8||Light breeze||8.7||Gentle breeze|
|Mar||4.5||Light breeze||8.6||Gentle breeze|
|Apr||4||Light breeze||7.8||Gentle breeze|
|May||3.7||Barely noticeable||7||Gentle breeze|
|Jun||3.5||Barely noticeable||6.7||Light breeze|
|Jul||3.5||Barely noticeable||6.9||Gentle breeze|
|Aug||3.5||Barely noticeable||6.9||Light breeze|
|Sep||3.5||Barely noticeable||6.7||Gentle breeze|
|Oct||3.4||Barely noticeable||6.5||Light breeze|
|Nov||3.9||Barely noticeable||7||Gentle breeze|
|Dec||4||Light breeze||7||Gentle breeze|
Show Relative Humidity by Month
|Month||Avg. Relative Humidity|
Is it Safe to Travel to Siero?
Our best data indicates this area is generally safe. As of Mar 17, 2019 there are no travel advisories or warnings for Spain; 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 May 03, 2018.
The Busiest and Least Crowded Months
The busiest month for tourism in Siero, Spain is August, followed by January and December. 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 Siero in October. Those willing to visit at these times will likely find it the least expensive month.
Estimated Tourism by Month
Most Popular Months to Visit
Overall Siero Travel Experience by Season
Spring (March through May)
Humidity and temperatures combine to make this season feel moderately cold. Highs range from 67.6°F (19.8°C) and 56.4°F (13.6°C) with warmer temperatures in the later months. Rain is somewhat common with 9 to 10 days of significant precipitation per month. Spring is fairly slow for tourism, which makes it a good time for those looking for deals.
Summer (June through August)
The middle-year months have comfortably cool weather with high temperatures that are comfortable. These months see the least precipitation with 4 to 6 days of precipitation per month. June – August is the busiest season for tourism in Siero, so lodging and other accommodations may cost more than usual.
Fall (September through November)
Fall daily highs range from 74.2°F (23.4°C) and 51.6°F (10.9°C), which will feel comfortable given the humidity and wind. It rains or snows a significant amount: 4 to 10 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 too cold this time of year in Siero to be enjoyable for warm weather travelers. The average high during this season is between 56.6°F (13.7°C) and 51.1°F (10.6°C). On average, it rains or snows a fair amount: 8 to 9 times per month. These times of year are the second busiest with tourists.