Letterkenny · days 1-14 from weather models · days 15-30 typical range (1991-2020)
🗺️ 14-day forecast map
Letterkenny & nearby cities — press play
Real forecast data for every city shown, from the same weather models as the city pages, updated several times a day. Icons show each day’s overall weather; the figure is the daytime maximum.
Next 14 days at a glance
From the model forecast
Warmest day
19°
Sat 26 Sep
Coldest night
6°
Wed 23 Sep
Days with rain
5 / 14
of 14 forecast days
Best day out
Sat 26 Sep
mild, dry & light wind
The next 4 weekends
For planning ahead
Sat 19 – Sun 20 Sep
16° 10°
57% rain risk
Sat 26 – Sun 27 Sep
22° 7°
typical range
Sat 3 – Sun 4 Oct
16° 8°
typical range
Sat 10 – Sun 11 Oct
17° 7°
typical range
30 days — Letterkenny
14 real + 16 synthesised
Sun · Today Cloudy
19°9°26%⌄
Wind8 mph S
Gusts16 mph
UV index3 – Low
Chance of rain26%
Sunrise06:59
Sunset19:53
Mon · Tomorrow Fog
17°12°5.0 mm⌄
Wind13 mph S
Gusts29 mph
UV index2 – Low
Chance of rain89%
Sunrise07:01
Sunset19:51
Tuesday 15/9 Showers
16°10°2.9 mm⌄
Wind15 mph W
Gusts25 mph
UV index3 – Low
Chance of rain78%
Sunrise07:03
Sunset19:48
Wednesday 16/9 Cloudy
15°9°0.9 mm⌄
Wind15 mph NW
Gusts28 mph
UV index3 – Moderate
Chance of rain56%
Sunrise07:05
Sunset19:46
Thursday 17/9 Showers
14°10°2.9 mm⌄
Wind17 mph W
Gusts28 mph
UV index3 – Moderate
Chance of rain80%
Sunrise07:07
Sunset19:43
Friday 18/9 Showers
16°12°0.9 mm⌄
Wind16 mph W
Gusts32 mph
UV index4 – Moderate
Chance of rain66%
Sunrise07:09
Sunset19:40
Saturday 19/9 Showers
14°10°1.0 mm⌄
Wind19 mph W
Gusts37 mph
UV index4 – Moderate
Chance of rain57%
Sunrise07:11
Sunset19:38
Sunday 20/9 Cloudy
16°11°21%⌄
Wind15 mph W
Gusts32 mph
UV index3 – Moderate
Chance of rain21%
Sunrise07:12
Sunset19:35
Monday 21/9 Sunny intervals
18°11°0.2 mm⌄
Wind15 mph SW
Gusts34 mph
UV index4 – Moderate
Chance of rain40%
Sunrise07:14
Sunset19:33
Tuesday 22/9 Sunny intervals
14°7°20%⌄
Wind15 mph NW
Gusts26 mph
UV index3 – Moderate
Chance of rain20%
Sunrise07:16
Sunset19:30
Wednesday 23/9 Cloudy
15°6°21%⌄
Wind7 mph NW
Gusts13 mph
UV index4 – Moderate
Chance of rain21%
Sunrise07:18
Sunset19:27
Thursday 24/9 Sunny
18°6°10%⌄
Wind7 mph S
Gusts14 mph
UV index5 – Moderate
Chance of rain10%
Sunrise07:20
Sunset19:25
Friday 25/9 Sunny
19°7°7%⌄
Wind8 mph S
Gusts15 mph
UV index5 – Moderate
Chance of rain7%
Sunrise07:22
Sunset19:22
Saturday 26/9 Sunny
19°7°7%⌄
Wind7 mph SE
Gusts14 mph
UV index5 – Moderate
Chance of rain7%
Sunrise07:24
Sunset19:20
Sunday 27/9 Rain (climate average)
22°13°4.6 mm⌄
Day≈19–25°
Night≈10–16°
Rain≈55 mm / September
(climate average)Typical range for these dates · 1991–2020
Monday 28/9 Sunny intervals (climate average)
24°14°20%⌄
Day≈21–27°
Night≈11–17°
Rain≈55 mm / September
(climate average)Typical range for these dates · 1991–2020
Tuesday 29/9 Sunny intervals (climate average)
25°14°20%⌄
Day≈22–28°
Night≈11–17°
Rain≈55 mm / September
(climate average)Typical range for these dates · 1991–2020
Wednesday 30/9 Rain (climate average)
23°13°3.5 mm⌄
Day≈20–26°
Night≈10–16°
Rain≈55 mm / September
(climate average)Typical range for these dates · 1991–2020
Thursday 1/10 Sunny intervals (climate average)
13°7°20%⌄
Day≈10–16°
Night≈4–10°
Rain≈50 mm / October
(climate average)Typical range for these dates · 1991–2020
Friday 2/10 Sunny intervals (climate average)
13°7°20%⌄
Day≈10–16°
Night≈4–10°
Rain≈50 mm / October
(climate average)Typical range for these dates · 1991–2020
Saturday 3/10 Rain (climate average)
14°8°4.3 mm⌄
Day≈11–17°
Night≈5–11°
Rain≈50 mm / October
(climate average)Typical range for these dates · 1991–2020
Sunday 4/10 Sunny intervals (climate average)
16°9°20%⌄
Day≈13–19°
Night≈6–12°
Rain≈50 mm / October
(climate average)Typical range for these dates · 1991–2020
Monday 5/10 Sunny intervals (climate average)
19°10°20%⌄
Day≈16–22°
Night≈7–13°
Rain≈50 mm / October
(climate average)Typical range for these dates · 1991–2020
Tuesday 6/10 Rain (climate average)
19°10°3.8 mm⌄
Day≈16–22°
Night≈7–13°
Rain≈50 mm / October
(climate average)Typical range for these dates · 1991–2020
Wednesday 7/10 Sunny intervals (climate average)
15°8°20%⌄
Day≈12–18°
Night≈5–11°
Rain≈50 mm / October
(climate average)Typical range for these dates · 1991–2020
Thursday 8/10 Sunny intervals (climate average)
14°7°20%⌄
Day≈11–17°
Night≈4–10°
Rain≈50 mm / October
(climate average)Typical range for these dates · 1991–2020
Friday 9/10 Rain (climate average)
14°7°3.5 mm⌄
Day≈11–17°
Night≈4–10°
Rain≈50 mm / October
(climate average)Typical range for these dates · 1991–2020
Saturday 10/10 Sunny intervals (climate average)
13°7°20%⌄
Day≈10–16°
Night≈4–10°
Rain≈50 mm / October
(climate average)Typical range for these dates · 1991–2020
Sunday 11/10 Sunny intervals (climate average)
17°9°20%⌄
Day≈14–20°
Night≈6–12°
Rain≈50 mm / October
(climate average)Typical range for these dates · 1991–2020
Monday 12/10 Rain (climate average)
18°10°5.7 mm⌄
Day≈15–21°
Night≈7–13°
Rain≈50 mm / October
(climate average)Typical range for these dates · 1991–2020
How does the long-range forecast work?
Days 1-14 are a real forecast from weather models. Days 15-30 are season-typical values based on 1991-2020 climate averages — good for planning, NOT an exact forecast that far ahead.
Days 1-14: Fetched live from weather models (UKV, ECMWF, GFS) with statistical correction. Reliability ~85% for days 1-3, ~60% for days 7-10, ~45% for days 11-14.
Days 15-30: A real forecast does not exist that far ahead (a chaotic system). Instead we show season-typical values: the month’s average max/min from 1991-2020 climate data (London baseline with latitude correction for Letterkenny), with mild weekly variation.
Use: "Roughly how warm is it usually in London in the last week of July?" — a good question for days 15-30. "Will it rain on 27 May?" — no serious forecast can say.
Forecasts from the UK Met Office UKV model, global weather models and official UK environmental data · Met Office UKV model · Environment Agency · Copernicus CAMS · NOAA