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Now · 7:00 AM

Trawsfynydd Weather & Hourly Forecast

United Kingdom · Wales · LL41 4PD

Light rain
14°C
Light rain
Feels like: 15°C
💧 Humidity 100% 🌡 Pressure 1020 hPa 💨 Wind 4 km/h 👁 Visibility 2.5 km Clouds 100% ☀️ UV index 0.0 · Low 🌅 Sunrise 🌇 Sunset

Hourly Forecast for Trawsfynydd

Today
Mist · 8:00 AM Mist
15° 💧 0.2 mm 💨 4 km/h H 99%1020 hPa
Partly cloudy · 11:00 AM Partly cloudy
16° 💧 0.2 mm 💨 9 km/h H 88%1021 hPa
Overcast · 2:00 PM Overcast
17° 💧 0.1 mm 💨 12 km/h H 78%1022 hPa
Overcast · 5:00 PM Overcast
16° 💧 0.0 mm 💨 10 km/h H 83%1021 hPa
Mostly cloudy night · 8:00 PM Mostly cloudy night
13° 💧 0.0 mm 💨 3 km/h H 100%1022 hPa
Fog at night · 11:00 PM Fog at night
12° 💧 0.0 mm 💨 4 km/h H 100%1023 hPa
Tomorrow
Fog at night · 2:00 AM Fog at night
13° 💧 0.1 mm 💨 9 km/h H 99%1022 hPa
Fog at night · 5:00 AM Fog at night
14° 💧 0.4 mm 💨 12 km/h H 100%1021 hPa
Fog · 8:00 AM Fog
15° 💧 0.4 mm 💨 13 km/h H 100%1020 hPa
Light rain · 11:00 AM Light rain
16° 💧 0.5 mm 💨 23 km/h H 100%1020 hPa
Light rain · 2:00 PM Light rain
17° 💧 0.7 mm 💨 25 km/h H 85%1020 hPa
Light rain · 5:00 PM Light rain
17° 💧 3.6 mm 💨 22 km/h H 98%1019 hPa
Light rain · 8:00 PM Light rain
17° 💧 1.7 mm 💨 24 km/h H 100%1018 hPa
Fog at night · 11:00 PM Fog at night
16° 💧 2.7 mm 💨 23 km/h H 100%1016 hPa
Tuesday
Moderate rain · 2:00 AM Moderate rain
16° 💧 7.5 mm 💨 25 km/h H 100%1014 hPa
Light rain · 5:00 AM Light rain
15° 💧 3.1 mm 💨 24 km/h H 99%1013 hPa

In Trawsfynydd and, more broadly, across Gwynedd: This morning will see mostly cloudy skies, with mild temperatures ranging from 15 to 20 degrees Celsius. Light southerly breezes are expected, with speeds reaching up to 7 mph and gusts up to 11 mph. During the afternoon, the cloud cover is likely to persist, and there is a slight chance of light rain, with accumulation around 0.4 mm. The probability of rainfall remains low, at about 20%. Overall, the weather will be relatively mild and breezy, with some cloudy periods and minimal chances of precipitation.

15-Day Weather Outlook for Trawsfynydd

TomorrowTomorrow Mostly cloudy Mostly cloudy 18°/13° 💧 None 💨 25 km/h
Tuesday, Sep 15Tue Sep 15 Light rain Light rain 16°/11° 💧 24 mm 💨 27 km/h
Wednesday, Sep 16Wed Sep 16 Light rain Light rain 13°/10° 💧 3.3 mm 💨 18 km/h
Thursday, Sep 17Thu Sep 17 Light rain Light rain 13°/10° 💧 12 mm 💨 23 km/h
Friday, Sep 18Fri Sep 18 Moderate rain Moderate rain 13°/ 💧 16 mm 💨 28 km/h
Saturday, Sep 19Sat Sep 19 Light rain Light rain 14°/10° 💧 3.2 mm 💨 22 km/h
Sunday, Sep 20Sun Sep 20 Overcast Overcast 14°/ 💧 0.1 mm 💨 17 km/h
Monday, Sep 21Mon Sep 21 Light rain Light rain 15°/13° 💧 3.9 mm 💨 25 km/h
Tuesday, Sep 22Tue Sep 22 Moderate rain Moderate rain 15°/14° 💧 13 mm 💨 28 km/h
Wednesday, Sep 23Wed Sep 23 Light rain Light rain 13°/11° 💧 1.7 mm 💨 17 km/h
Thursday, Sep 24Thu Sep 24 Light rain Light rain 13°/ 💧 7.0 mm 💨 14 km/h
Friday, Sep 25Fri Sep 25 Partly cloudy Partly cloudy 14°/ 💧 0.0 mm 💨 10 km/h
Saturday, Sep 26Sat Sep 26 Mostly cloudy Mostly cloudy 13°/ 💧 4.5 mm 💨 19 km/h
Sunday, Sep 27Sun Sep 27 Mostly cloudy Mostly cloudy 12°/ 💧 0.3 mm 💨 13 km/h

TEMPERATURE OUTLOOK

Temperature & Weather Trends in Trawsfynydd

Vertical axis: °C · Color based on temperature
Mist at 8:00 AM
15° Today 8:00 AM
Overcast at 9:00 AM
15° 9:00 AM
Light rain at 10:00 AM
15° 10:00 AM
Partly cloudy at 11:00 AM
16° 11:00 AM
Mostly cloudy at 12:00 PM
17° Today 12:00 PM
Overcast at 1:00 PM
17° 1:00 PM
Overcast at 2:00 PM
17° 2:00 PM
Mostly cloudy at 3:00 PM
17° 3:00 PM
Mostly cloudy at 4:00 PM
17° Today 4:00 PM
Overcast at 5:00 PM
16° 5:00 PM
Overcast at 6:00 PM
16° 6:00 PM
Overcast at 7:00 PM
15° 7:00 PM
Mostly cloudy night at 8:00 PM
13° Today 8:00 PM
Mist at night at 9:00 PM
12° 9:00 PM
Fog at night at 10:00 PM
12° 10:00 PM
Fog at night at 11:00 PM
12° 11:00 PM
Fog at night at 12:00 AM
12° Tomorrow 12:00 AM
Fog at night at 1:00 AM
13° 1:00 AM
Fog at night at 2:00 AM
13° 2:00 AM
Fog at night at 3:00 AM
13° 3:00 AM
Mist at night at 4:00 AM
14° Tomorrow 4:00 AM
Fog at night at 5:00 AM
14° 5:00 AM
Fog at night at 6:00 AM
14° 6:00 AM
Light rain at 7:00 AM
15° 7:00 AM
Fog at 8:00 AM
15° Tomorrow 8:00 AM
Light rain at 9:00 AM
16° 9:00 AM
Light rain at 10:00 AM
16° 10:00 AM
Light rain at 11:00 AM
16° 11:00 AM
Mist at 12:00 PM
17° Tomorrow 12:00 PM
Mostly cloudy at 1:00 PM
18° 1:00 PM
Light rain at 2:00 PM
17° 2:00 PM
Light rain at 3:00 PM
17° 3:00 PM
Light rain at 4:00 PM
17° Tomorrow 4:00 PM
Light rain at 5:00 PM
17° 5:00 PM
Light rain at 6:00 PM
17° 6:00 PM
Light rain at 7:00 PM
17° 7:00 PM
Light rain at 8:00 PM
17° Tomorrow 8:00 PM
Light rain at 9:00 PM
16° 9:00 PM
Light rain at 10:00 PM
16° 10:00 PM
Fog at night at 11:00 PM
16° 11:00 PM
Light rain at 12:00 AM
16° Tuesday 12:00 AM
Light rain at 1:00 AM
16° 1:00 AM
Moderate rain at 2:00 AM
16° 2:00 AM
Light rain at 3:00 AM
16° 3:00 AM
Light rain at 4:00 AM
15° Tuesday 4:00 AM
Light rain at 5:00 AM
15° 5:00 AM
Light rain at 6:00 AM
14° 6:00 AM
Light rain at 7:00 AM
13° 7:00 AM
Mist at 8:00 AM
13° Tuesday 8:00 AM
Light rain at 9:00 AM
13° 9:00 AM
Light rain at 10:00 AM
13° 10:00 AM
Light rain at 11:00 AM
13° 11:00 AM
Light rain at 12:00 PM
14° Tuesday 12:00 PM
Mostly sunny at 1:00 PM
14° 1:00 PM
Light rain at 10:00 PM
11° 10:00 PM
Light rain at 1:00 AM
11° 1:00 AM
Light rain at 4:00 AM
10° Wednesday 4:00 AM
Light rain at 7:00 AM
10° 7:00 AM
Overcast at 10:00 AM
12° 10:00 AM
Light rain at 1:00 PM
13° 1:00 PM
Mostly cloudy at 4:00 PM
13° Wednesday 4:00 PM
Overcast at 7:00 PM
12° 7:00 PM
Overcast night at 10:00 PM
12° 10:00 PM
Light rain at 1:00 AM
12° 1:00 AM
Light rain at 4:00 AM
11° Thursday 4:00 AM
Light rain at 7:00 AM
12° 7:00 AM
Light rain at 10:00 AM
12° 10:00 AM
Light rain at 1:00 PM
13° 1:00 PM
Mostly sunny at 4:00 PM
12° Thursday 4:00 PM
Light rain at 7:00 PM
11° 7:00 PM
Partly cloudy night at 10:00 PM
10° 10:00 PM
Light rain at 1:00 AM
1:00 AM
Moderate rain at 4:00 AM
Friday 4:00 AM
Moderate rain at 7:00 AM
10° 7:00 AM
Moderate rain at 10:00 AM
11° 10:00 AM
Light rain at 1:00 PM
12° 1:00 PM
Light rain at 4:00 PM
13° Friday 4:00 PM
Mostly sunny at 7:00 PM
12° 7:00 PM
Light rain at 1:00 AM
14° 1:00 AM
Light rain at 7:00 AM
13° 7:00 AM
Mostly cloudy at 1:00 PM
10° Saturday 1:00 PM
Mostly sunny at 7:00 PM
14° 7:00 PM
Overcast night at 1:00 AM
13° 1:00 AM
Partly cloudy at 7:00 AM
10° 7:00 AM
Partly cloudy at 1:00 PM
Sunday 1:00 PM
Partly cloudy at 7:00 PM
14° 7:00 PM
Overcast night at 1:00 AM
13° 1:00 AM
Light rain at 7:00 AM
14° 7:00 AM
Light rain at 1:00 PM
14° Monday 1:00 PM
Light rain at 7:00 PM
15° 7:00 PM
Light rain at 1:00 AM
14° 1:00 AM
Light rain at 7:00 AM
14° 7:00 AM
Moderate rain at 1:00 PM
14° Tuesday 1:00 PM
Mostly sunny at 7:00 PM
15° 7:00 PM
Mostly cloudy night at 1:00 AM
13° 1:00 AM
Overcast night at 7:00 AM
11° 7:00 AM
Overcast at 1:00 PM
11° Wednesday 1:00 PM
Light rain at 7:00 PM
11° 7:00 PM
Light rain at 1:00 AM
10° 1:00 AM
Mostly clear night at 7:00 AM
7:00 AM
Mostly sunny at 1:00 PM
Thursday 1:00 PM
Partly cloudy at 7:00 PM
13° 7:00 PM
Partly cloudy night at 1:00 AM
10° 1:00 AM
Mostly cloudy night at 7:00 AM
7:00 AM
Overcast at 1:00 PM
Friday 1:00 PM
Overcast at 7:00 PM
14° 7:00 PM
Overcast night at 1:00 AM
11° 1:00 AM
Clear night at 7:00 AM
7:00 AM
Mostly sunny at 1:00 PM
10° Saturday 1:00 PM
Mostly cloudy at 7:00 PM
13° 7:00 PM
Clear night at 1:00 AM
10° 1:00 AM
Partly cloudy night at 7:00 AM
7:00 AM
Mostly cloudy at 1:00 PM
Sunday 1:00 PM
Overcast at 7:00 PM
12° 7:00 PM

AIR QUALITY FORECAST

Air Quality Forecast for Trawsfynydd

Hourly forecast · Updated every 2 hours
Fair
Nearest forecast value 8:00 AM
PM2.5 Fine particles Good 3,5µg/m³

Microscopic particles that can penetrate deep into the lungs. Elevated concentrations can especially affect children, older adults and people with respiratory conditions.

PM10 Particulate matter Good 4,4µg/m³

Includes dust, pollen and other airborne particles. High concentrations may irritate the respiratory system.

O₃ Ozone Fair 63,6µg/m³

Ground-level ozone can irritate the eyes and respiratory system when concentrations are elevated.

NO₂ Nitrogen dioxide Good 1,5µg/m³

A gas emitted mainly by traffic and some industrial activity. High exposure can affect respiratory health.

Air quality is acceptable for most people.

UV & HEALTH

UV, Sun & Health Outlook in Trawsfynydd

Maximum daily UV Today, tomorrow and the following day show the maximum UV index forecast for each day.
0–2 Low 3–5 Moderate 6–7 High 8–10 Very high 11+ Extreme
Today UV 3,8Moderate 🙂Fair
Tomorrow UV 3,2Moderate 🙂Fair
Tuesday UV 1,8Low 🙂Fair
Wednesday UV 2,3Low 🙂Fair
Thursday UV 3,0Moderate 🙂Fair
Friday UV 3,0Moderate Unavailable
Saturday UV 3,0Moderate Unavailable
Hourly UV index today
8:00 AMUV 0,1 9:00 AMUV 0,4 10:00 AMUV 1,2 11:00 AMUV 2,3 12:00 PMUV 3,3 1:00 PMUV 3,8 2:00 PMUV 3,5 3:00 PMUV 3,0 4:00 PMUV 1,9 5:00 PMUV 1,1 6:00 PMUV 0,4 7:00 PMUV 0,0
Today's weather health advice Open today's recommendations.

Moderate UV risk

Sunglasses and sun protection are recommended for prolonged exposure.

Acceptable air quality

Air quality is acceptable for most people. Very sensitive people may want to reduce prolonged exertion.

Comfortable temperature conditions

Temperatures should feel comfortable for most people, with no particular heat or cold precautions needed.

Good conditions for outdoor activities

Outdoor activities can generally be enjoyed normally, with sun protection adjusted to the UV level.

WIND OUTLOOK

Hourly Wind Forecast for Trawsfynydd

Vertical axis: km/h · Horizontal axis: hours
Hourly wind speed Chart of sustained wind and maximum gusts in km/h. Today 8:00 AM 9:00 AM 10:00 AM 11:00 AM Today 12:00 PM 1:00 PM 2:00 PM 3:00 PM Today 4:00 PM 5:00 PM 6:00 PM 7:00 PM Today 8:00 PM 9:00 PM 10:00 PM 11:00 PM Tomorrow 12:00 AM 1:00 AM 2:00 AM 3:00 AM Tomorrow 4:00 AM 5:00 AM 6:00 AM 7:00 AM Tomorrow 8:00 AM 9:00 AM 10:00 AM 11:00 AM Tomorrow 12:00 PM 1:00 PM 2:00 PM 3:00 PM Tomorrow 4:00 PM 5:00 PM 6:00 PM 7:00 PM Tomorrow 8:00 PM 9:00 PM 10:00 PM 11:00 PM Tuesday 12:00 AM 1:00 AM 2:00 AM 3:00 AM Tuesday 4:00 AM 5:00 AM 6:00 AM 7:00 AM Tuesday 8:00 AM 9:00 AM 10:00 AM 11:00 AM Tuesday 12:00 PM 1:00 PM 10:00 PM 1:00 AM Wednesday 4:00 AM 7:00 AM 10:00 AM 1:00 PM Wednesday 4:00 PM 7:00 PM 10:00 PM 1:00 AM Thursday 4:00 AM 7:00 AM 10:00 AM 1:00 PM Thursday 4:00 PM 7:00 PM 10:00 PM 1:00 AM Friday 4:00 AM 7:00 AM 10:00 AM 1:00 PM Friday 4:00 PM 7:00 PM 1:00 AM 7:00 AM Saturday 1:00 PM 7:00 PM 1:00 AM 7:00 AM Sunday 1:00 PM 7:00 PM 1:00 AM 7:00 AM Monday 1:00 PM 7:00 PM 1:00 AM 7:00 AM Tuesday 1:00 PM 7:00 PM 1:00 AM 7:00 AM Wednesday 1:00 PM 7:00 PM 1:00 AM 7:00 AM Thursday 1:00 PM 7:00 PM 1:00 AM 7:00 AM Friday 1:00 PM 7:00 PM 1:00 AM 7:00 AM Saturday 1:00 PM 7:00 PM 1:00 AM 7:00 AM Sunday 1:00 PM 7:00 PM
Sustained wind Max gusts
NIGHT SKY · TRAWSFYNYDD, WALES

Tonight's Stargazing & Shooting Stars

Local night-sky conditions and meteor activity for Jasper.

0/100Best-hour score
No good viewing window tonight Astronomical darkness exists, but current sky conditions are unfavorable.
Cloud cover 100% Real hourly forecast for the best viewing hour.
Moonlight 5% Waxing Crescent · Moon below the horizon at the best viewing hour.
Meteor activity September ε-Perseids Reference ZHR 8 · Radiant 24° high at the best hour.
Estimated visible meteors Poor visibility Meteor activity may occur above the clouds, but local viewing conditions are not suitable.
Chance ≥1 meteor in 30 minNot meaningful
UPCOMING METEOR PERIODSStart, peak and end dates · weather should be checked closer to the peak.
SEP 5–SEP 21
September ε-PerseidsStart SEP 5 · Peak SEP 9 · End SEP 21 · ZHR 8 · 6% Moon at peak
ACTIVE NOW
SEP 20–NOV 20
Southern TauridsStart SEP 20 · Peak NOV 5 · End NOV 20 · ZHR 7 · 20% Moon at peak
UPCOMING
OCT 2–NOV 7
OrionidsStart OCT 2 · Peak OCT 21 · End NOV 7 · ZHR 20 · 77% Moon at peak
UPCOMING
OCT 20–DEC 10
Northern TauridsStart OCT 20 · Peak NOV 12 · End DEC 10 · ZHR 5 · 7% Moon at peak
UPCOMING

Experimental local observing estimate. Weather values come from the hourly forecast already used on this page. Moon position and astronomical darkness are calculated locally from time and coordinates. Meteor-shower ZHR describes ideal conditions and is not the number of meteors a person should expect to see locally.

Forecast data for Trawsfynydd were last refreshed today at 7:00 AM. The current forecast period extends through 15/09/2026 at 5:00 AM. Weather, air-quality and UV-index data are provided through WEATHER-INFO.COM. Forecasts are produced automatically from the latest available data and are subject to periodic technical checks. This service is intended for general weather information.