The best times to visit Llandeilo for ideal weather are

June 25th to August 26th

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



Other Llandeilo Travel Info

Weather in Llandeilo


Average temperatures in Llandeilo vary somewhat. Considering humidity, temperatures feel cold for most of the year with a chance of rain or snow throughout most of the year. The area is less temperate than some — in the 12th 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 Llandeilo, 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 66.8°F (19.3°C) with temperatures rarely dropping below 49.9°F (9.9°C) at night.

Llandeilo Temperatures (Fahrenheit)


Llandeilo 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.

Llandeilo Perceived Temperature (F)


Llandeilo Perceived Temperature (C)



Average Llandeilo 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 42.3 37.9 32.6
Feb 43.4 38.1 32.7
Mar 48.2 40.5 33.2
Apr 54.5 45.4 36.4
May 57.9 49.7 41.7
Jun 63 54.6 45.8
Jul 64.9 57.1 49.3
Aug 64 56.3 48.7
Sep 61 53.1 45.1
Oct 55.4 49.2 42.7
Nov 48.3 43.2 37.5
Dec 43.4 38.7 33.2

Show Celsius

Month Avg. High (°C) Avg. Mean (°C) Avg. Low (°C)
Jan 5.7 3.3 0.3
Feb 6.3 3.4 0.4
Mar 9 4.7 0.7
Apr 12.5 7.4 2.4
May 14.4 9.8 5.4
Jun 17.2 12.6 7.7
Jul 18.3 13.9 9.6
Aug 17.8 13.5 9.3
Sep 16.1 11.7 7.3
Oct 13 9.6 5.9
Nov 9.1 6.2 3.1
Dec 6.3 3.7 0.7



Precipitation (Rain or Snow)

If dry weather is what you’re after, the months with the lowest chance of significant precipitation in Llandeilo are April, March, and then June. Note that we define “significant precipitation” as .1 inches or more in this section. The lowest chance of rain or snow occurs around late May. For example, on the week of May 21st there is 1 day of precipitation on average. By contrast, it’s most likely to rain or snow in early to mid January with an average of 4 days of significant precipitation the week of January 8th.

When can you find snow in Llandeilo? Weather stations report very large amounts of snow likely to be deepest around October, especially close to late October. The best time to ski (if at all) in Llandeilo 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 Llandeilo.

Days with precipitation

Snow on the Ground

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

Snow depth

Average Rain and Snow by Month

Show Inches

Month Daily Chance of Rain Average Snow Depth (in) Total Precipitation (in)
Jan 48% 5.7 6.8
Feb 38% 2.1 3.8
Mar 28% 1.3 3.5
Apr 25% 0.8 2.8
May 33% 0.8 3.9
Jun 28% 0 3.3
Jul 37% 0 5
Aug 37% 0 4.5
Sep 29% 0 3.7
Oct 41% 23.6 5.2
Nov 52% 5.4 6.9
Dec 50% 2.2 7.9

Show Centimeters

Month Daily Chance of Rain Average Snow Depth (cm) Total Precipitation (cm)
Jan 48 14.5 17.3
Feb 38 5.3 9.7
Mar 28 3.3 8.9
Apr 25 2 7.1
May 33 2 9.9
Jun 28 0 8.4
Jul 37 0 12.7
Aug 37 0 11.4
Sep 29 0 9.4
Oct 41 59.9 13.2
Nov 52 13.7 17.5
Dec 50 5.6 20.1


Humidity and Wind

Llandeilo has some extremely humid months, and high humidity throughout the year. The least humid month is April (76.3% relative humidity), and the most humid month is January (91.1%).

Wind in Llandeilo is usually calm. The windiest month is January, followed by December and February. January’s average wind speed of around 8.5 knots (9.8 MPH or 15.8 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 late December where average top sustained speeds reach 17.5 knots, which is considered a fresh breeze.

Relative Humidity (%)

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

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 8.5 Gentle breeze 15.1 Significant breeze
Feb 7.4 Gentle breeze 13.2 Significant breeze
Mar 6.6 Light breeze 12.4 Significant breeze
Apr 6.6 Light breeze 11.9 Significant breeze
May 6.8 Light breeze 12.1 Significant breeze
Jun 6 Light breeze 10.9 Gentle breeze
Jul 6.1 Light breeze 11 Significant breeze
Aug 6.2 Light breeze 11.1 Significant breeze
Sep 5.5 Light breeze 10.4 Significant breeze
Oct 7.1 Gentle breeze 12.5 Significant breeze
Nov 7.2 Gentle breeze 13 Significant breeze
Dec 8.2 Gentle breeze 14.8 Significant breeze

Show Relative Humidity by Month

Month Avg. Relative Humidity
Jan 91.1%
Feb 88.6%
Mar 82.2%
Apr 76.3%
May 76.7%
Jun 77.4%
Jul 80.7%
Aug 83.5%
Sep 84.1%
Oct 87.6%
Nov 90.6%
Dec 90.9%


Is it Safe to Travel to Llandeilo?

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 Llandeilo, the United Kingdom is June, followed by May and July. 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 Llandeilo 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

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 slightly extrapolated based on nearby areas. Displayed data is calculated relative to the peak, so a score of 56.1 in November means 56.1% of the tourists vs. June.



Overall Llandeilo Travel Experience by Season

Spring (March through May)

Humidity and temperatures combine to make this season feel moderately cold. Highs range from 61.5°F (16.4°C) and 45.5°F (7.5°C) with warmer temperatures in the later months. Rain is somewhat common with 7 to 10 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 brisk. These months see moderate precipitation with 9 to 11 days of precipitation per month. June – August is the busiest season for tourism in Llandeilo, so lodging and other accommodations may cost more than usual.

Fall (September through November)

Fall daily highs range from 63.1°F (17.3°C) and 44°F (6.7°C), which will feel chilly given the humidity and wind. It rains or snows a good amount: 9 to 16 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 Llandeilo to be enjoyable for warm weather travelers. The average high during this season is between 45.5°F (7.5°C) and 40.1°F (4.5°C). On average, it rains or snows a very great amount: 11 to 15 times per month. These times of year are fairly slow with tourists.


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