Climate Insights for Haverfordwest

The climate in Haverfordwest is temperate. The average annual temperature is 12°C and approximately 1130mm of precipitation falls per year. Haverfordwest receives a notable amount of rainfall throughout the year, including during its driest month. Haverfordwest is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: August, July, September. The coldest months are February, January, March, when temperatures can drop to 6°C.

Haverfordwest sees moderate temperature variation throughout the year, ranging from 6°C to 18°C. August is the warmest month, though highs remain moderate at 18°C with a mean of 16°C. February is the coolest month, with minimum temperatures around 6°C and an average of 8°C. Daily temperature variation is modest, with an average difference of 3°C between highs and lows. The sharpest temperature change occurs between October and November, with a 3°C shift in average temperatures.

Haverfordwest is a moderately rainy area, receiving approximately 1130mm of precipitation annually, which averages out to around 94mm per month. The wettest month is December, averaging 137mm of rainfall. November and October also tend to see above-average precipitation. The driest month is May, with just 55mm. That's 83mm less than December, the wettest month. Precipitation varies noticeably between seasons, with the second half (July to December) of the year generally seeing more rainfall.

Haverfordwest is moderately windy, with an average annual wind speed of 22km/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 27km/h, noticeable enough to affect lighter outdoor activities. The calmest conditions occur in May, with average winds dropping to 17km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 10km/h gap 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 25km/h in winter, 19km/h in spring, 18km/h in summer, 23km/h in autumn.

It is currently autumn in Haverfordwest, which began on September 23, 2026. Haverfordwest 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 August at around 18°C, while the coldest stretch bottoms out in February near 6°C. Winter is next, beginning on December 21, 2026 (87 days from now).

The best time to visit Haverfordwest is during July and August, when the weather is most comfortable for travellers. During these months, average temperatures hover around 16°C with modest rainfall averaging 75mm per month. By contrast, February can be quite cold with temperatures dropping to 6°C. Despite being the best months overall, some rain is still likely. Pack a waterproof layer and plan a mix of indoor and outdoor activities.

The table below shows monthly climate averages for Haverfordwest 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. 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.