Table S1.

Annual root mean squared error (RMSE) and mean absolute error (MAE) between weather station data and different domain designs for the period 1981–2010 for maximum two-meter temperature. Bold numbers indicate the lowest values for MAE and RMSE for the high-resolution 5 km domain. Table S2. Annual root mean squared error (RMSE), mean absolute error (MAE), and temporal correlation between weather station data and different domain designs for the period 1981–2010 for precipitation. Bold numbers indicate the lowest values for MAE and RMSE for the high-resolution 5 km domain. Fig S1. Comparison of different WRF designs with weather station data. The panels A-C show the monthly maximum temperature in degrees Celsius and panels D-F show the monthly precipitation sum in millimeters for the years 1981–2010. A and D: Gangaw, B and E: Shwebo, and C and F: Mandalay. The orange colors indicate the domain covering the Dry Zone (Fig 1A), the pink colors indicate the domains of the Dry Zone with outskirts (Fig 1B) and the teal colors indicate the domain covering the Bay of Bengal (Fig 1C). The bright colors indicate the coarser domain of 25 km resolution and the dark color represent the high resolution 5 km domain. The grey boxes indicate the weather station data, whereas the grey shading shows the full range of the weather station data for each months for better comparison with the other datasets. The boxes represent the 25th to 75th percentile, while the whiskers extend to the value that is no more than 1.5 times the interquartile range away from the box. Fig S2. Comparison of Bay of Bengal WRF design with weather station, MSWEP and IMERG data. The grey boxes indicate the weather station data, whereas the grey shading shows the full range of the weather station data for each months for better comparison with the other datasets. The green boxes indicates the 5 km domain of the Bay of Bengal domain design, the red boxes indicate MSWEP data and the orange boxes represent IMERG data. The boxes represent the 25th to 75th percentile, while the whiskers extend to the value that is no more than 1.5 times the interquartile range away from the box. Fig S3. Increase in monthly 2-metre average temperature in Myanmar for different scenarios, time periods and months. The panels A and D show the maximum 2-metre temperature in May and April, respectively, for the period 1981–2010. Panels B-C and E-F show the difference between the future climate and the present climate. B: the difference with respect to SSP2-4.5 mid century for May, C: the difference with respect to SSP2-4.5 end of century for May, E: the difference with respect to SSP5-8.5 mid century for May, and F: the difference with respect to SSP5-8.5 end of century for April. The open-source Myanmar State and Regional Boundaries MIMU v9.4 dataset provided all the state and region boundaries and Natural Earth data provides the countries’ outline. Fig S4. Increase in monthly 2-metre maximum temperature in Myanmar for different scenarios and periods for June. The panels A and D show the maximum 2-metre temperature in June for the period 1981–2010.Panels B-C and E-F show the difference between the future climate and the present climate. B: the difference with respect to SSP2-4.5 mid century, C: the difference with respect to SSP2-4.5 end of century, E: the difference with respect to SSP5-8.5 mid century, and F: the difference with respect to SSP5-8.5 end of century. The open-source Myanmar State and Regional Boundaries MIMU v9.4 dataset provided all the state and region boundaries and the Natural Earth data provides the countries’ outline. Fig S5. Projected change in monthly precipitation at different stations. The boxplots show the distribution of the 30 values at each month (x-axis) at different stations (compare Fig 1) for the present climate simulation (grey box), the mid- and end of century simulation for the SSP2-4.5 (light and dark blue boxes, respectively) and the mid- and end of century simulation for the SSP5-8.5 (orange and red boxes, respectively). The boxes represent the 25th to 75th percentile,while the whiskers extend to the value that is no more than 1.5 times the interquartile range away from the box. (ZIP)