I felt a little bit coldbit chilly this morning after I wokewaking up in my bed. I felt a bit chilly this morning after waking up in my bed.

Autumn is really herehas truly arrived. Autumn has truly arrived.

BeforeUntil today, I dihadn’'t feelt cold in the morning aleven though it was technically it was autumn. Until today, I hadn't felt cold in the morning even though it was technically autumn.

Before today I didn’t feel cold in the morning, although technically it was autumn. Before today I didn’t feel cold in the morning, although technically it was autumn.

Adding more flow into the sentence so that it can be read more naturally. Try reading the sentence aloud to yourself and whenever you need to breathe, add a comma.

According to the calendar, the seventh of August imarks the first day of autumn, but people didn’'t feelsense even a slittleght coolness on that day. According to the calendar, the seventh of August marks the first day of autumn, but people didn't sense even a slight coolness on that day.

According to the calendar, the seventh of August is the first day of autumn, but people didn’on't feel even a little cool on that day. According to the calendar, the seventh of August is the first day of autumn, but people don't feel even a little cool on that day.

Plural form.

It didn’t become coolCooler weather typically doesn't set in until the end of August in my area everyach year. Cooler weather typically doesn't set in until the end of August in my area each year.

According toBased on my experience in the weather, it will gradually become, it should gradually start getting colder starting today. Based on my experience, it should gradually start getting colder starting today.

According to my experience inwith the weather, it will gradually become cold starting today. According to my experience with the weather, it will gradually become cold starting today.

In the subsequentcoming days, it will be gettingget colder and colder, especially after each rainfall. In the coming days, it will get colder and colder, especially after each rainfall.

In the subsequent days, it will be getting colder and colder after each rain. In the subsequent days, it will be getting colder and colder after each rain.

In the subsequent days, it will be getting colder and colder after each rain. In the subsequent days, it will be getting colder and colder after each rain.