Climate Insights for Llandeilo

The climate in Llandeilo is cool. The average annual temperature is 10°C and approximately 1361mm of precipitation falls per year. Llandeilo receives a notable amount of rainfall throughout the year, including during its driest month. Llandeilo is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: July, August, June. The coldest months are January, February, March, when temperatures can drop to 2°C. Light snow can occur between January and December.

Llandeilo sees moderate temperature variation throughout the year, ranging from 2°C to 19°C. July is the warmest month, though highs remain moderate at 19°C with a mean of 15°C. January is the coolest month, with minimum temperatures around 2°C and an average of 5°C. Daily temperature variation is modest, with an average difference of 6°C between highs and lows. The sharpest temperature change occurs between April and May, with a 3°C shift in average temperatures.

Llandeilo is a fairly wet location, receiving approximately 1361mm of precipitation annually, which averages out to around 113mm per month. The wettest month is December, averaging 162mm of rainfall. October and November also tend to see above-average precipitation. The driest month is April, with just 71mm. That's 91mm less than December, the wettest month. Rainfall is relatively evenly distributed throughout the year, so there is no pronounced dry or wet season to plan around. Light snowfall can occur between January and December, totalling around 14cm annually. March is the snowiest month with approximately 4cm.

Llandeilo is moderately windy, with an average annual wind speed of 21km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is February, averaging 24km/h, noticeable enough to affect lighter outdoor activities. The calmest conditions occur in June, with average winds dropping to 18km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 6km/h between the calmest and windiest months. Wind tends to be stronger during winter months, driven by seasonal pressure systems. The seasonal averages break down to 23km/h in winter, 20km/h in spring, 18km/h in summer, 21km/h in autumn.

It is currently spring in Llandeilo, which began on March 20, 2026. Llandeilo is in the Northern Hemisphere, where spring begins in March, summer in June, autumn in September, and winter in December. The warmest period peaks in July at around 19°C, while the coldest stretch bottoms out in January near 2°C. Summer is next, beginning on June 21, 2026 — 87 days from now.

The table below shows monthly climate averages for Llandeilo based on historical weather data. Min and max temperatures represent typical overnight lows and afternoon highs for each month, shown in degrees Celsius (°C). Precipitation is measured in millimetres (mm) and indicates the average total rainfall per month. Snow is measured in centimetres (cm) and reflects average monthly snowfall accumulation. Wind speed is the average sustained speed in kilometres per hour (km/h). All values are based on averages from over 10 years of historical weather data. The current month is highlighted for quick reference.