Compare Irish counties
Pick two or three counties to see their rainfall, sunshine and temperatures side by side, month by month.
Donegal gets 2% more rain a year than Derry (1211 mm against 1186 mm), with 6 fewer rain days and 43 fewer hours of sunshine. July afternoons average 18°C in Donegal and 18°C in Derry; January nights 3°C and 3°C.
Rainfall by month
0 50 100 Donegal, Jan: 87 mm Donegal, Feb: 101 mm Donegal, Mar: 86 mm Donegal, Apr: 91 mm Donegal, May: 85 mm Donegal, Jun: 88 mm Donegal, Jul: 108 mm Donegal, Aug: 109 mm Donegal, Sep: 98 mm Donegal, Oct: 129 mm Donegal, Nov: 104 mm Donegal, Dec: 125 mm Derry, Jan: 92 mm Derry, Feb: 96 mm Derry, Mar: 79 mm Derry, Apr: 89 mm Derry, May: 85 mm Derry, Jun: 86 mm Derry, Jul: 103 mm Derry, Aug: 110 mm Derry, Sep: 104 mm Derry, Oct: 125 mm Derry, Nov: 93 mm Derry, Dec: 124 mm Fermanagh, Jan: 83 mm Fermanagh, Feb: 104 mm Fermanagh, Mar: 91 mm Fermanagh, Apr: 87 mm Fermanagh, May: 91 mm Fermanagh, Jun: 92 mm Fermanagh, Jul: 101 mm Fermanagh, Aug: 104 mm Fermanagh, Sep: 107 mm Fermanagh, Oct: 140 mm Fermanagh, Nov: 96 mm Fermanagh, Dec: 120 mm Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Daytime high by month
0 5 10 15 Donegal, Jan: 7 °C Donegal, Feb: 9 °C Donegal, Mar: 10 °C Donegal, Apr: 12 °C Donegal, May: 15 °C Donegal, Jun: 17 °C Donegal, Jul: 18 °C Donegal, Aug: 18 °C Donegal, Sep: 16 °C Donegal, Oct: 13 °C Donegal, Nov: 10 °C Donegal, Dec: 8 °C Derry, Jan: 7 °C Derry, Feb: 9 °C Derry, Mar: 10 °C Derry, Apr: 12 °C Derry, May: 15 °C Derry, Jun: 17 °C Derry, Jul: 18 °C Derry, Aug: 18 °C Derry, Sep: 16 °C Derry, Oct: 13 °C Derry, Nov: 10 °C Derry, Dec: 8 °C Fermanagh, Jan: 7 °C Fermanagh, Feb: 9 °C Fermanagh, Mar: 10 °C Fermanagh, Apr: 12 °C Fermanagh, May: 16 °C Fermanagh, Jun: 17 °C Fermanagh, Jul: 19 °C Fermanagh, Aug: 19 °C Fermanagh, Sep: 17 °C Fermanagh, Oct: 14 °C Fermanagh, Nov: 10 °C Fermanagh, Dec: 8 °C Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Sunshine by month
0.0 2.5 5.0 7.5 Donegal, Jan: 3.3 hours a day Donegal, Feb: 4.2 hours a day Donegal, Mar: 5.6 hours a day Donegal, Apr: 8.3 hours a day Donegal, May: 9.3 hours a day Donegal, Jun: 8.7 hours a day Donegal, Jul: 7.6 hours a day Donegal, Aug: 8.6 hours a day Donegal, Sep: 6.8 hours a day Donegal, Oct: 4.4 hours a day Donegal, Nov: 3.4 hours a day Donegal, Dec: 2.4 hours a day Derry, Jan: 3.4 hours a day Derry, Feb: 4.2 hours a day Derry, Mar: 5.9 hours a day Derry, Apr: 8.4 hours a day Derry, May: 9.3 hours a day Derry, Jun: 8.8 hours a day Derry, Jul: 7.7 hours a day Derry, Aug: 8.7 hours a day Derry, Sep: 6.9 hours a day Derry, Oct: 4.5 hours a day Derry, Nov: 3.6 hours a day Derry, Dec: 2.6 hours a day Fermanagh, Jan: 3.6 hours a day Fermanagh, Feb: 3.9 hours a day Fermanagh, Mar: 5.7 hours a day Fermanagh, Apr: 8.2 hours a day Fermanagh, May: 9.6 hours a day Fermanagh, Jun: 9.4 hours a day Fermanagh, Jul: 8.1 hours a day Fermanagh, Aug: 8.9 hours a day Fermanagh, Sep: 7.0 hours a day Fermanagh, Oct: 4.5 hours a day Fermanagh, Nov: 3.9 hours a day Fermanagh, Dec: 2.7 hours a day Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Rain days by month
0 5 10 15 Donegal, Jan: 15 days Donegal, Feb: 16 days Donegal, Mar: 15 days Donegal, Apr: 16 days Donegal, May: 16 days Donegal, Jun: 15 days Donegal, Jul: 18 days Donegal, Aug: 18 days Donegal, Sep: 16 days Donegal, Oct: 18 days Donegal, Nov: 17 days Donegal, Dec: 18 days Derry, Jan: 15 days Derry, Feb: 17 days Derry, Mar: 15 days Derry, Apr: 16 days Derry, May: 16 days Derry, Jun: 18 days Derry, Jul: 19 days Derry, Aug: 19 days Derry, Sep: 16 days Derry, Oct: 19 days Derry, Nov: 17 days Derry, Dec: 18 days Fermanagh, Jan: 14 days Fermanagh, Feb: 16 days Fermanagh, Mar: 16 days Fermanagh, Apr: 17 days Fermanagh, May: 17 days Fermanagh, Jun: 16 days Fermanagh, Jul: 18 days Fermanagh, Aug: 17 days Fermanagh, Sep: 16 days Fermanagh, Oct: 19 days Fermanagh, Nov: 15 days Fermanagh, Dec: 18 days Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Figures are averages for 2021–2025 at each county town, from the ERA5 weather reanalysis via Open-Meteo. They describe typical lowland weather in each county; hills and exposed coasts are wetter and windier.