Hourly Weather Forecast - Merthyr, Carmarthenshire - Sir Gaerfyrddin, GB

4 AM
46°F
10%
7mph
N
Cloudy
Humidity
95%
Feels like
42°F
Dew Point
44°F
5 AM
45°F
10%
7mph
N
Cloudy
Humidity
95%
Feels like
41°F
Dew Point
44°F
6 AM
44°F
0%
7mph
N
Cloudy
Humidity
97%
Feels like
40°F
Dew Point
44°F
7 AM
44°F
0%
7mph
N
Foggy
Humidity
99%
Feels like
40°F
Dew Point
44°F
8 AM
44°F
0%
5mph
N
Cloudy
Humidity
97%
Feels like
40°F
Dew Point
43°F
8:19 AM
9 AM
44°F
0%
4mph
NNW
Cloudy
Humidity
96%
Feels like
42°F
Dew Point
43°F
10 AM
46°F
0%
4mph
NNW
Cloudy
Humidity
93%
Feels like
44°F
Dew Point
44°F
11 AM
47°F
0%
4mph
NNW
Cloudy
Humidity
88%
Feels like
45°F
Dew Point
44°F
12 PM
48°F
0%
5mph
NNW
Cloudy
Humidity
85%
Feels like
46°F
Dew Point
44°F
1 PM
48°F
0%
6mph
NNW
Cloudy
Humidity
83%
Feels like
46°F
Dew Point
43°F
2 PM
47°F
0%
6mph
NNW
Mostly Sunny
Humidity
83%
Feels like
44°F
Dew Point
42°F
3 PM
45°F
0%
4mph
NNW
Mostly Sunny
Humidity
86%
Feels like
44°F
Dew Point
41°F
4 PM
43°F
0%
2mph
NW
Partly Cloudy
Humidity
89%
Feels like
43°F
Dew Point
40°F
4:07 PM
5 PM
41°F
0%
3mph
NW
Hazy
Humidity
92%
Feels like
41°F
Dew Point
39°F
6 PM
39°F
0%
2mph
WNW
Hazy
Humidity
94%
Feels like
39°F
Dew Point
38°F
7 PM
38°F
0%
1mph
WNW
Hazy
Humidity
96%
Feels like
38°F
Dew Point
37°F
8 PM
37°F
0%
1mph
NNE
Hazy
Humidity
96%
Feels like
37°F
Dew Point
36°F
9 PM
37°F
0%
1mph
SE
Hazy
Humidity
96%
Feels like
37°F
Dew Point
36°F
10 PM
37°F
10%
1mph
SE
Partly Cloudy
Humidity
95%
Feels like
37°F
Dew Point
35°F
11 PM
37°F
10%
2mph
ESE
Partly Cloudy
Humidity
91%
Feels like
37°F
Dew Point
35°F

Rainfall Totals Through Wednesday A.M.

Heavy Rain Returns to Deluge Pacific Northwest

Another atmospheric river will hit the Pacific Northwest with heavy rain and high winds.

Monday's Weather Outlook

Today's Weather Outlook

How to Measure Snow via NWS

How To Measure Snow

Weekly Drought Map for December 11, 2025

Hit-or-Miss Precipitation Leads to Mixed Drought Results

A person standing in a snowy forest with their back to the camera. They are bundled up in a white hat and a brown jacket. (Image by StockSnap from Pixabay)

Common Cold Weather Illnesses

A strong cold-air-damming event from March 20, 2018.

Cold Air Damming - Cause And Effects

loading ad...

Today's National Outlook

Hurricane Tracker

Allergy Forecast

Snow & Ski Forecast

Traffic Cameras

Weather Cameras

Traffic Cameras

Weather Cameras

Outdoor Sports Guide