YOU SAID:

the weather is rainy, with spells of sunshine

INTO JAPANESE

天気は雨で、太陽の光がつい

BACK INTO ENGLISH

The weather was rainy and the sun was shining.

INTO JAPANESE

雨が降り、太陽が輝いていた。

BACK INTO ENGLISH

It was raining and the sun was shining.

INTO JAPANESE

雨が降っていて、太陽が輝いていました。

BACK INTO ENGLISH

It was raining and the sun was shining.