Charak Samhita
तस्मात् साधारणः सर्वो विधिर्वर्षासु शस्यते। उदमन्थं दिवास्वप्नमवश्यायं नदीजलम् ॥३५॥
॥ Indications and contra-indications in rainy season॥ Hence, in rainy season all basic rules regarding diet and lifestyle are advised to balance all three dosha. One should avoid diluted mantha(excess liquid diet) , sleeping during the day, exposure to dew, river water, physical exercise, sun rays and sexual intercourse in this season.
english translation
tasmAt sAdhAraNaH sarvo vidhirvarSAsu zasyate। udamanthaM divAsvapnamavazyAyaM nadIjalam ॥35॥
hk transliteration by Sanscript