The best times to visit Grantham for ideal weather are
June 11th 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.
Grantham Travel Guide
Other Grantham Travel Info
Weather in Grantham
Average temperatures in Grantham vary greatly. 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 29th 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 Grantham, the hottest months are July, August, and then June. See average monthly temperatures below. The warmest time of year is generally early August where highs are regularly around 72.6°F (22.6°C) with temperatures rarely dropping below 53.5°F (11.9°C) at night.
Grantham Temperatures (Fahrenheit)
Grantham 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.
Grantham Perceived Temperature (F)
Grantham Perceived Temperature (C)
Average Grantham 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 Grantham are March, April, and then September. Note that we define “significant precipitation” as .1 inches or more in this section. The lowest chance of rain or snow occurs around mid March. For example, on the week of March 19th there are no days of precipitation on average. By contrast, it’s most likely to rain or snow in late May to early June with an average of 2 days of significant precipitation the week of May 28th.
When can you find snow in Grantham? Weather stations report a good amount of seasonal snow likely to be deepest around December, especially close to early to mid December. The best time to ski (if at all) in Grantham is often around around December 10th 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 Grantham.
Snow on the Ground
The graph below shows the average snow on the ground in Grantham (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
Grantham has some extremely humid months, and above average humidity throughout the year. The least humid month is July (66.6% relative humidity), and the most humid month is December (83.5%).
Wind in Grantham is usually moderate. The windiest month is December, followed by January and November. December’s average wind speed of around 12.4 knots (14.3 MPH or 23 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 early to mid January where average top sustained speeds reach 20 knots, which is considered a fresh breeze.
Relative Humidity (%)
The graph below shows the average % humidity by month in Grantham.
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||12.3||Significant breeze||18.7||Strong breeze|
|Feb||11||Significant breeze||16.7||Significant breeze|
|Mar||10.9||Gentle breeze||16.9||Strong breeze|
|Apr||9.7||Gentle breeze||15.4||Significant breeze|
|May||10.2||Gentle breeze||16.1||Strong breeze|
|Jun||8.8||Gentle breeze||14.3||Significant breeze|
|Jul||9.2||Gentle breeze||14.9||Strong breeze|
|Aug||9.8||Gentle breeze||15.6||Significant breeze|
|Sep||9.6||Gentle breeze||15.2||Strong breeze|
|Oct||10.2||Gentle breeze||15.9||Significant breeze|
|Nov||11.3||Significant breeze||17.6||Strong breeze|
|Dec||12.4||Significant breeze||18.8||Strong breeze|
Show Relative Humidity by Month
|Month||Avg. Relative Humidity|
Is it Safe to Travel to Grantham?
Our best data indicates this area is somewhat safe. As of Oct 07, 2019 there are travel warnings for the United Kingdom; exercise a high degree of caution. Check this page for any recent changes or regions to avoid: Travel Advice and Advisories. This advisory was last updated on Sep 06, 2019.
The Busiest and Least Crowded Months
The busiest month for tourism in Grantham, the United Kingdom is November, followed by September and June. 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 Grantham 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
Overall Grantham Travel Experience by Season
Spring (March through May)
Humidity and temperatures combine to make this season feel moderately cold. Highs range from 64.1°F (17.8°C) and 48.5°F (9.2°C) with warmer temperatures in the later months. Rain is somewhat common with 3 to 6 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 most precipitation with 6 to 7 days of precipitation per month. June – August is the second busiest season for tourism in Grantham, so lodging and other accommodations may cost slightly more.
Fall (September through November)
Fall daily highs range from 67.7°F (19.8°C) and 45.9°F (7.7°C), which will feel chilly given the humidity and wind. It rains or snows a significant amount: 4 to 7 days per month. Tourism is the busiest during these months due to the weather, so hotels may be higher priced.
Winter (December through February)
Weather is too cold this time of year in Grantham to be enjoyable for warm weather travelers. The average high during this season is between 48.5°F (9.2°C) and 42.7°F (5.9°C). On average, it rains or snows a fair amount: 5 to 6 times per month. These times of year are the slowest with tourists.