The best times to visit Sister Bay for ideal weather are
May 21st to September 23rd
based on average temperature and humidity from NOAA (the National Oceanic and Atmospheric Administration). Read below for more weather and travel details.
Sister Bay Travel Guide
Other Sister Bay Travel Info
Weather in Sister Bay
Temperature
Average temperatures in Sister Bay vary drastically. Considering humidity, temperatures feel cold for about half of the year and otherwise nice with a low chance of precipitation most of the year. The area is somewhat temperate — in the 43rd 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 Sister Bay, the hottest months are July, August, and then June. See average monthly temperatures below. The warmest time of year is generally mid July where highs are regularly around 80.6°F (27°C) with temperatures rarely dropping below 59.7°F (15.4°C) at night.
Sister Bay Temperatures (Fahrenheit)
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Sister Bay Temperatures (Celsius)
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“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.
Sister Bay Perceived Temperature (F)
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Sister Bay Perceived Temperature (C)
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Average Sister Bay 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) |
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Jan | 25.7 | 17.8 | 10.3 |
Feb | 27.6 | 18.8 | 10.7 |
Mar | 40.6 | 30.7 | 21.8 |
Apr | 51.9 | 41.4 | 32.5 |
May | 65.5 | 54.1 | 44.4 |
Jun | 74.4 | 63.9 | 54.5 |
Jul | 79.5 | 68.9 | 58.5 |
Aug | 77.5 | 67.4 | 57.6 |
Sep | 70.2 | 59.6 | 50.1 |
Oct | 57.1 | 48.3 | 40.4 |
Nov | 44 | 36.3 | 29 |
Dec | 30.7 | 24 | 17 |
Show Celsius
Month | Avg. High (°C) | Avg. Mean (°C) | Avg. Low (°C) |
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Jan | -3.5 | -7.9 | -12.1 |
Feb | -2.4 | -7.3 | -11.8 |
Mar | 4.8 | -0.7 | -5.7 |
Apr | 11.1 | 5.2 | 0.3 |
May | 18.6 | 12.3 | 6.9 |
Jun | 23.6 | 17.7 | 12.5 |
Jul | 26.4 | 20.5 | 14.7 |
Aug | 25.3 | 19.7 | 14.2 |
Sep | 21.2 | 15.3 | 10.1 |
Oct | 13.9 | 9.1 | 4.7 |
Nov | 6.7 | 2.4 | -1.7 |
Dec | -0.7 | -4.4 | -8.3 |
Precipitation (Rain or Snow)
If dry weather is what you’re after, the months with the lowest chance of significant precipitation in Sister Bay are February, January, and then December. 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 February. For example, on the week of February 12th there are no days of precipitation on average. By contrast, it’s most likely to rain or snow in late May with an average of 2 days of significant precipitation the week of May 21st.
When can you find snow in Sister Bay? Weather stations report no annual snow. 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 Sister Bay.
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Snow on the Ground
The graph below shows the average snow on the ground in Sister Bay (in).
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Average Rain and Snow by Month
Show Inches
Month | Daily Chance of Rain | Average Snow Depth (in) | Total Precipitation (in) |
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Jan | 4% | 0 | 0.4 |
Feb | 1% | 0 | 0.1 |
Mar | 5% | 0 | 0.6 |
Apr | 16% | 0 | 1.7 |
May | 18% | 0 | 2.3 |
Jun | 20% | 0 | 2.2 |
Jul | 20% | 0 | 2.6 |
Aug | 14% | 0 | 2.1 |
Sep | 14% | 0 | 2.1 |
Oct | 13% | 0 | 2.1 |
Nov | 6% | 0 | 0.6 |
Dec | 4% | 0 | 0.5 |
Show Centimeters
Month | Daily Chance of Rain | Average Snow Depth (cm) | Total Precipitation (cm) |
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Jan | 4 | 0 | 1 |
Feb | 1 | 0 | 0.3 |
Mar | 5 | 0 | 1.5 |
Apr | 16 | 0 | 4.3 |
May | 18 | 0 | 5.8 |
Jun | 20 | 0 | 5.6 |
Jul | 20 | 0 | 6.6 |
Aug | 14 | 0 | 5.3 |
Sep | 14 | 0 | 5.3 |
Oct | 13 | 0 | 5.3 |
Nov | 6 | 0 | 1.5 |
Dec | 4 | 0 | 1.3 |
Humidity and Wind
Sister Bay has some high humidity months, with other comfortably humid months. The least humid month is April (52.4% relative humidity), and the most humid month is September (65.6%).
Wind in Sister Bay is usually calm. The windiest month is April, followed by May and March. April’s average wind speed of around 7.9 knots (9.1 MPH or 14.7 KPH) is considered “a gentle breeze.” Maximum sustained winds (the highest speed for the day lasting more than a few moments) are at their highest in early to mid April where average top sustained speeds reach 16.1 knots, which is considered a moderate breeze.
Relative Humidity (%)
The graph below shows the average % humidity by month in Sister Bay.
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Wind
The graph below shows wind speed (max and average) in knots.
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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 | 6.2 | Light breeze | 12.8 | Significant breeze |
Feb | 6.6 | Light breeze | 13.6 | Significant breeze |
Mar | 6.9 | Light breeze | 14.2 | Significant breeze |
Apr | 7.9 | Gentle breeze | 15.6 | Significant breeze |
May | 7.2 | Gentle breeze | 14.7 | Significant breeze |
Jun | 6.1 | Light breeze | 13.3 | Significant breeze |
Jul | 5.5 | Light breeze | 12.5 | Significant breeze |
Aug | 5.2 | Light breeze | 12 | Significant breeze |
Sep | 5.7 | Light breeze | 12.7 | Significant breeze |
Oct | 6.4 | Light breeze | 13.3 | Significant breeze |
Nov | 6.3 | Light breeze | 13 | Significant breeze |
Dec | 5.9 | Light breeze | 12.2 | Significant breeze |
Show Relative Humidity by Month
Month | Avg. Relative Humidity |
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Jan | 56.5% |
Feb | 54.3% |
Mar | 53.4% |
Apr | 52.4% |
May | 53.2% |
Jun | 60.2% |
Jul | 60.9% |
Aug | 64.6% |
Sep | 65.6% |
Oct | 62% |
Nov | 59.8% |
Dec | 63.1% |
Is it Safe to Travel to Sister Bay?
Our best data indicates this area is generally safe. As of Dec 04, 2023 there are no travel advisories or warnings for the United States; 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 Dec 04, 2023.
The Busiest and Least Crowded Months
The busiest month for tourism in Sister Bay, WI, US is July, followed by June and May. 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 Sister Bay in November. Those willing to visit at these times will likely find it the least expensive month.
Estimated Tourism by Month
Most Popular Months to Visit
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Overall Sister Bay Travel Experience by Season
Spring (March through May)
Humidity and temperatures combine to make this season feel moderately cold. Highs range from 71.7°F (22.1°C) and 28.9°F (-1.7°C) with far warmer temperatures in the later months. Rain is somewhat common with 2 to 6 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 very comfortable weather with high temperatures that are comfortable. These months see the most precipitation with 4 to 6 days of precipitation per month. June – August is the busiest season for tourism in Sister Bay, so lodging and other accommodations may cost more than usual.
Fall (September through November)
Fall daily highs range from 73.8°F (23.2°C) and 35.9°F (2.2°C), which will feel chilly given the humidity and wind. It rains or snows a normal amount: 2 to 4 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 Sister Bay to be enjoyable for warm weather travelers. The average high during this season is between 30.8°F (-0.7°C) and 23.9°F (-4.5°C). On average, it rains or snows a very small amount: 0 to 1 times per month. These times of year are fairly slow with tourists.
Best Times to Travel› the United States › Sister Bay, WI, US