As of 23:59 BST

Weather in Merthyr Mawr

+18°Weather now

Merthyr Mawr, Saturday, 8 August, 23:59

Overcast. Feels like 17°C. High 26°C, low 10°C.

Pressure1016 mb
Wind2 mph N
Humidity65%
Visibility6.2 mi
Dew point11°C
Sun, 09+13 ° /24 °0Mainly clear
+24 °Mainly clear

Merthyr Mawr, Sunday, 9 August

Mainly clear. High 24°C, low 13°C.

Pressure1014 mb
Wind12 mph W
Humidity54%
Visibility6.2 mi
Dew point11°C
Mon, 10+12 ° /23 °0Overcast
+23 °Overcast

Merthyr Mawr, Monday, 10 August

Overcast. High 23°C, low 12°C.

Pressure1021 mb
Wind9 mph W
Humidity43%
Visibility6.2 mi
Dew point7°C
Tue, 11+13 ° /27 °0Mainly clear
+27 °Mainly clear

Merthyr Mawr, Tuesday, 11 August

Mainly clear. High 27°C, low 13°C.

Pressure1023 mb
Wind10 mph SE
Humidity46%
Visibility6.2 mi
Dew point11°C
Wed, 12+15 ° /30 °0Overcast
+30 °Overcast

Merthyr Mawr, Wednesday, 12 August

Overcast. High 30°C, low 15°C.

Pressure1021 mb
Wind11 mph SE
Humidity34%
Visibility6.2 mi
Dew point9°C
Thu, 13+19 ° /31 °0Partly cloudy
+31 °Partly cloudy

Merthyr Mawr, Thursday, 13 August

Partly cloudy. High 31°C, low 19°C.

Pressure1017 mb
Wind13 mph W
Humidity26%
Visibility—
Dew point8°C
Fri, 14+17 ° /21 °0Partly cloudy
+21 °Partly cloudy

Merthyr Mawr, Friday, 14 August

Partly cloudy. High 21°C, low 17°C.

Pressure1018 mb
Wind15 mph W
Humidity80%
Visibility—
Dew point17°C
Sat, 15+15 ° /23 °0.3Light rain
+23 °Light rain

Merthyr Mawr, Saturday, 15 August

Light rain. High 23°C, low 15°C.

Pressure1016 mb
Wind14 mph NW
Humidity67%
Visibility—
Dew point14°C
Sun, 16+16 ° /20 °1.1Light rain
+20 °Light rain

Merthyr Mawr, Sunday, 16 August

Light rain. High 20°C, low 16°C.

Pressure1019 mb
Wind9 mph W
Humidity89%
Visibility—
Dew point15°C
Mon, 17+15 ° /18 °3.9Light rain
+18 °Light rain

Merthyr Mawr, Monday, 17 August

Light rain. High 18°C, low 15°C.

Pressure1013 mb
Wind23 mph SW
Humidity96%
Visibility—
Dew point16°C
Tue, 18+14 ° /19 °0Clear sky
+19 °Clear sky

Merthyr Mawr, Tuesday, 18 August

Clear sky. High 19°C, low 14°C.

Pressure1015 mb
Wind21 mph W
Humidity57%
Visibility—
Dew point10°C
Wed, 19+12 ° /18 °0Overcast
+18 °Overcast

Merthyr Mawr, Wednesday, 19 August

Overcast. High 18°C, low 12°C.

Pressure1016 mb
Wind19 mph W
Humidity51%
Visibility—
Dew point7°C
Thu, 20+13 ° /19 °0Clear sky
+19 °Clear sky

Merthyr Mawr, Thursday, 20 August

Clear sky. High 19°C, low 13°C.

Pressure1014 mb
Wind15 mph W
Humidity59%
Visibility—
Dew point9°C
Fri, 21+11 ° /19 °0Overcast
+19 °Overcast

Merthyr Mawr, Friday, 21 August

Overcast. High 19°C, low 11°C.

Pressure1014 mb
Wind14 mph N
Humidity53%
Visibility—
Dew point8°C
Sat, 22+13 ° /21 °1.3Light rain
+21 °Light rain

Merthyr Mawr, Saturday, 22 August

Light rain. High 21°C, low 13°C.

Pressure1019 mb
Wind12 mph E
Humidity48%
Visibility—
Dew point9°C
Sun, 23+14 ° /20 °0Overcast
+20 °Overcast

Merthyr Mawr, Sunday, 23 August

Overcast. High 20°C, low 14°C.

Pressure1020 mb
Wind11 mph W
Humidity56%
Visibility—
Dew point10°C

Questions about the month ahead

How accurate is a month-long forecast?

The first 16 days come from weather models — highly reliable for the first 3–5 days, gradually less so after that. Days 17 to 30 for Merthyr Mawr are built from climate averages over the last 60 years, so they show typical weather for those dates rather than a specific forecast.

What does "above average" mean?

We compare the forecast with the climate average for exactly the same calendar days, calculated from 60 years of observations. The difference shows how the coming month compares with a typical one.

Where do the 66-year records come from?

These are real historical extremes recorded in Merthyr Mawr since 1960: the highest and lowest temperature for each calendar date, with the year it happened.

How often is the 30-day forecast updated?

The forecast portion refreshes every hour. The climate portion is based on long-term data and stays stable.