Howth Hill TT – Weather Forecast
Category 4Killiney, County Dublin, IE
This page shows a route-based weather forecast for the Howth Hill TT cycling climb in Killiney, County Dublin, IE. Unlike a simple location forecast, conditions are calculated at every point along the climb — from the base to the summit — using the actual route profile and elevation data.
You'll see hour-by-hour temperature, wind speed and direction, precipitation probability, and cloud cover adjusted for altitude. Choose your planned departure time to align the forecast with your ride.
Howth Hill TT
Plan Your Ride
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Calculating weather along route...
Trip Summary
Forecast A
Trip Summary A
Forecast B
Trip Summary B
Weather Display Options
Forecast A - Route Map
Forecast B - Route Map
Compare Reversed Route
Same departure time & speed — opposite direction
→ Original Direction
← Reversed Direction
Creates a new saved route in the reversed direction
Route Map
Elevation Profile
Temperature Along Route
Precipitation & Precipitation Probability Along Route
Wind Along Route
Humidity Along Route
Pollen Along Route
UV Index Along Route
Start place details
Weather Forecast
Hourly around Fri 19 Jun 08:31
Climate Overview
| Month |
Temp Day
|
Temp Night
|
Sunny Days
|
Sun Hours
|
Rain Days
|
Precipitation
|
Humidity
|
UV Index
|
Day Length
|
|---|---|---|---|---|---|---|---|---|---|
| Jan | 8°C | 3°C | 15 | 4.4h | 17 | 102 mm | 75 % | 2 | 8h 10m |
| Feb | 9°C | 5°C | 13 | 4.4h | 20 | 74 mm | 73 % | 3 | 9h 51m |
| Mar | 11°C | 6°C | 24 | 8.2h | 12 | 24 mm | 70 % | 4 | 11h 54m |
| Apr | 13°C | 7°C | 24 | 9.6h | 17 | 140 mm | 68 % | 5 | 14h 2m |
| May | 16°C | 9°C | 27 | 12.5h | 13 | 44 mm | 65 % | 6 | 15h 55m |
| Jun | 19°C | 12°C | 25 | 11.0h | 21 | 113 mm | 67 % | 7 | 16h 55m |
| Jul | 20°C | 14°C | 24 | 10.3h | 24 | 122 mm | 66 % | 8 | 16h 24m |
| Aug | 20°C | 14°C | 28 | 11.2h | 20 | 54 mm | 68 % | 7 | 14h 42m |
| Sep | 16°C | 11°C | 20 | 7.8h | 24 | 151 mm | 70 % | 5 | 12h 39m |
| Oct | 14°C | 10°C | 15 | 5.2h | 17 | 102 mm | 72 % | 4 | 10h 32m |
| Nov | 11°C | 7°C | 12 | 4.4h | 23 | 137 mm | 76 % | 2 | 8h 37m |
| Dec | 10°C | 6°C | 9 | 3.6h | 18 | 111 mm | 77 % | 2 | 7h 35m |