Compare Irish counties
Pick two or three counties to see their rainfall, sunshine and temperatures side by side, month by month.
Mayo gets 1% more rain a year than Galway (1442 mm against 1424 mm), with 11 more rain days and 171 fewer hours of sunshine. July afternoons average 18°C in Mayo and 19°C in Galway; January nights 3°C and 3°C.
Rainfall by month
0 50 100 150 Mayo, Jan: 114 mm Mayo, Feb: 132 mm Mayo, Mar: 113 mm Mayo, Apr: 87 mm Mayo, May: 93 mm Mayo, Jun: 113 mm Mayo, Jul: 102 mm Mayo, Aug: 131 mm Mayo, Sep: 114 mm Mayo, Oct: 172 mm Mayo, Nov: 130 mm Mayo, Dec: 141 mm Galway, Jan: 110 mm Galway, Feb: 120 mm Galway, Mar: 115 mm Galway, Apr: 88 mm Galway, May: 83 mm Galway, Jun: 103 mm Galway, Jul: 116 mm Galway, Aug: 121 mm Galway, Sep: 110 mm Galway, Oct: 176 mm Galway, Nov: 134 mm Galway, Dec: 148 mm Roscommon, Jan: 81 mm Roscommon, Feb: 98 mm Roscommon, Mar: 99 mm Roscommon, Apr: 82 mm Roscommon, May: 79 mm Roscommon, Jun: 90 mm Roscommon, Jul: 97 mm Roscommon, Aug: 103 mm Roscommon, Sep: 100 mm Roscommon, Oct: 144 mm Roscommon, Nov: 96 mm Roscommon, Dec: 107 mm Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Daytime high by month
0 5 10 15 Mayo, Jan: 8 °C Mayo, Feb: 9 °C Mayo, Mar: 11 °C Mayo, Apr: 13 °C Mayo, May: 15 °C Mayo, Jun: 17 °C Mayo, Jul: 18 °C Mayo, Aug: 18 °C Mayo, Sep: 17 °C Mayo, Oct: 14 °C Mayo, Nov: 11 °C Mayo, Dec: 9 °C Galway, Jan: 8 °C Galway, Feb: 10 °C Galway, Mar: 11 °C Galway, Apr: 13 °C Galway, May: 16 °C Galway, Jun: 18 °C Galway, Jul: 19 °C Galway, Aug: 19 °C Galway, Sep: 17 °C Galway, Oct: 14 °C Galway, Nov: 11 °C Galway, Dec: 9 °C Roscommon, Jan: 7 °C Roscommon, Feb: 9 °C Roscommon, Mar: 11 °C Roscommon, Apr: 13 °C Roscommon, May: 16 °C Roscommon, Jun: 18 °C Roscommon, Jul: 19 °C Roscommon, Aug: 19 °C Roscommon, Sep: 17 °C Roscommon, Oct: 14 °C Roscommon, Nov: 10 °C Roscommon, Dec: 8 °C Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Sunshine by month
0.0 5.0 10.0 Mayo, Jan: 3.3 hours a day Mayo, Feb: 4.2 hours a day Mayo, Mar: 5.6 hours a day Mayo, Apr: 8.1 hours a day Mayo, May: 9.7 hours a day Mayo, Jun: 8.8 hours a day Mayo, Jul: 8.4 hours a day Mayo, Aug: 8.7 hours a day Mayo, Sep: 6.9 hours a day Mayo, Oct: 4.7 hours a day Mayo, Nov: 3.6 hours a day Mayo, Dec: 2.8 hours a day Galway, Jan: 3.9 hours a day Galway, Feb: 4.4 hours a day Galway, Mar: 5.8 hours a day Galway, Apr: 8.5 hours a day Galway, May: 10.5 hours a day Galway, Jun: 9.5 hours a day Galway, Jul: 9.2 hours a day Galway, Aug: 9.2 hours a day Galway, Sep: 7.2 hours a day Galway, Oct: 5.2 hours a day Galway, Nov: 4.0 hours a day Galway, Dec: 3.0 hours a day Roscommon, Jan: 3.7 hours a day Roscommon, Feb: 4.1 hours a day Roscommon, Mar: 5.5 hours a day Roscommon, Apr: 8.2 hours a day Roscommon, May: 9.7 hours a day Roscommon, Jun: 9.1 hours a day Roscommon, Jul: 8.4 hours a day Roscommon, Aug: 8.7 hours a day Roscommon, Sep: 6.9 hours a day Roscommon, Oct: 5.0 hours a day Roscommon, Nov: 4.1 hours a day Roscommon, Dec: 2.9 hours a day Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Rain days by month
0 10 20 Mayo, Jan: 15 days Mayo, Feb: 18 days Mayo, Mar: 16 days Mayo, Apr: 15 days Mayo, May: 15 days Mayo, Jun: 19 days Mayo, Jul: 18 days Mayo, Aug: 20 days Mayo, Sep: 16 days Mayo, Oct: 20 days Mayo, Nov: 17 days Mayo, Dec: 18 days Galway, Jan: 14 days Galway, Feb: 18 days Galway, Mar: 16 days Galway, Apr: 14 days Galway, May: 16 days Galway, Jun: 17 days Galway, Jul: 17 days Galway, Aug: 17 days Galway, Sep: 15 days Galway, Oct: 20 days Galway, Nov: 17 days Galway, Dec: 17 days Roscommon, Jan: 13 days Roscommon, Feb: 15 days Roscommon, Mar: 16 days Roscommon, Apr: 14 days Roscommon, May: 15 days Roscommon, Jun: 16 days Roscommon, Jul: 15 days Roscommon, Aug: 16 days Roscommon, Sep: 15 days Roscommon, Oct: 18 days Roscommon, Nov: 16 days Roscommon, Dec: 15 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.