The best times to visit St Marys for ideal weather are

April 30th to October 14th

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

 

 


Other St Marys Travel Info

Weather in St Marys

Temperature

Average temperatures in St Marys vary drastically. 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 less temperate than some — in the 28th 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 St Marys, 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 85.9°F (29.9°C) with temperatures rarely dropping below 64.2°F (17.9°C) at night.

St Marys Temperatures (Fahrenheit)

Key
High
Average
Low

St Marys Temperatures (Celsius)

Key
High
Average
Low

“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.

St Marys Perceived Temperature (F)

Key
High
Average
Low

St Marys Perceived Temperature (C)

Key
High
Average
Low

 

Average St Marys 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 33.5 25.8 18.5
Feb 33.8 25.8 18.6
Mar 50.5 39.9 31.3
Apr 63.6 51.5 40.9
May 75.7 63.5 52.4
Jun 82.7 71.5 61.4
Jul 84.8 73.7 63
Aug 83 71.6 61
Sep 77.7 65.3 54.7
Oct 65.5 53.9 44.4
Nov 52 42.3 33.7
Dec 40.6 33.1 26.4

Show Celsius

Month Avg. High (°C) Avg. Mean (°C) Avg. Low (°C)
Jan 0.8 -3.4 -7.5
Feb 1 -3.4 -7.4
Mar 10.3 4.4 -0.4
Apr 17.6 10.8 4.9
May 24.3 17.5 11.3
Jun 28.2 21.9 16.3
Jul 29.3 23.2 17.2
Aug 28.3 22 16.1
Sep 25.4 18.5 12.6
Oct 18.6 12.2 6.9
Nov 11.1 5.7 0.9
Dec 4.8 0.6 -3.1

 


 

Precipitation (Rain or Snow)

If dry weather is what you’re after, the months with the lowest chance of significant precipitation in St Marys are January, February, and then November. Note that we define “significant precipitation” as .1 inches or more in this section. The lowest chance of rain or snow occurs around early November. For example, on the week of November 5th there are no days of precipitation on average. By contrast, it’s most likely to rain or snow in late April with an average of 3 days of significant precipitation the week of April 23rd.

When can you find snow in St Marys? 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 St Marys.

Key
Days with precipitation

Snow on the Ground

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

Key
Snow depth

Average Rain and Snow by Month

Show Inches

Month Daily Chance of Rain Average Snow Depth (in) Total Precipitation (in)
Jan 16% 0 2.2
Feb 17% 0 2.3
Mar 23% 0 3.4
Apr 29% 0 4.5
May 25% 0 3.7
Jun 30% 0 4.7
Jul 20% 0 2.9
Aug 22% 0 4
Sep 22% 0 3
Oct 19% 0 2.6
Nov 19% 0 2.8
Dec 24% 0 3.3

Show Centimeters

Month Daily Chance of Rain Average Snow Depth (cm) Total Precipitation (cm)
Jan 16 0 5.6
Feb 17 0 5.8
Mar 23 0 8.6
Apr 29 0 11.4
May 25 0 9.4
Jun 30 0 11.9
Jul 20 0 7.4
Aug 22 0 10.2
Sep 22 0 7.6
Oct 19 0 6.6
Nov 19 0 7.1
Dec 24 0 8.4

 

Humidity and Wind

St Marys has some high humidity months, with other comfortably humid months. The least humid month is April (52.3% relative humidity), and the most humid month is December (69.4%).

Wind in St Marys is usually moderate. The windiest month is January, followed by April and February. January’s average wind speed of around 9.9 knots (11.4 MPH or 18.4 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 January where average top sustained speeds reach 17.3 knots, which is considered a fresh breeze.

Relative Humidity (%)

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

Key
Avg. Relative Humidity

Wind

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

Key
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 9.9 Gentle breeze 16.5 Significant breeze
Feb 9.4 Gentle breeze 16 Significant breeze
Mar 9 Gentle breeze 15.3 Significant breeze
Apr 9.6 Gentle breeze 16.8 Significant breeze
May 7.7 Gentle breeze 14.5 Significant breeze
Jun 7 Gentle breeze 14.5 Significant breeze
Jul 5.7 Light breeze 12 Significant breeze
Aug 5 Light breeze 10.9 Gentle breeze
Sep 5.8 Light breeze 11.4 Significant breeze
Oct 7.6 Gentle breeze 13.7 Significant breeze
Nov 8.8 Gentle breeze 14.6 Significant breeze
Dec 9.2 Gentle breeze 15.5 Significant breeze

Show Relative Humidity by Month

Month Avg. Relative Humidity
Jan 65.1%
Feb 63.9%
Mar 57.9%
Apr 52.3%
May 54.3%
Jun 57.8%
Jul 58.7%
Aug 63%
Sep 60.2%
Oct 57.7%
Nov 59.5%
Dec 69.4%

 

Is it Safe to Travel to St Marys?

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 St Marys, OH, 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 St Marys 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

Key
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 44.5 in November means 44.5% of the tourists vs. July.

 

 

Overall St Marys Travel Experience by Season

Spring (March through May)

Humidity and temperatures combine to make this season feel moderately cold. Highs range from 80.9°F (27.2°C) and 38.3°F (3.5°C) with far warmer temperatures in the later months. Rain is somewhat common with 7 to 9 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 moderate precipitation with 6 to 9 days of precipitation per month. June – August is the busiest season for tourism in St Marys, so lodging and other accommodations may cost more than usual.

Fall (September through November)

Fall daily highs range from 81.7°F (27.6°C) and 45.5°F (7.5°C), which will feel chilly given the humidity and wind. It rains or snows a significant amount: approximately 6 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 St Marys to be enjoyable for warm weather travelers. The average high during this season is between 41.4°F (5.2°C) and 30.4°F (-0.9°C). On average, it rains or snows a fair amount: 5 to 7 times per month. These times of year are fairly slow with tourists.

 

Best Times to Travel› the United States › St Marys, OH, US