Climate averages 1991–2020

Baytown weather
in September.

A hot, wet month: the 4th warmest and the wettest of the year.

Long-term climate patterns, not a forecast for a particular trip.

Average high 30.3°C Daytime mean, September

Average low 22.2°C Night-time mean, September

Rainfall 129 mm 13 days with ≥1 mm

Daylight 12 h Sunrise to sunset, per day

September is a hot month in Baytown: daytime highs average 30.3°C and nights cool to about 22.2°C. By daytime temperature it is the 4th warmest of the 12 months.

Expect about 129 mm of rain on roughly 13 days, which makes September a wet month (the wettest month of the year). Daylight, from sunrise to sunset, lasts about 12 h 22 min on an average September day.

The nearest other city in this atlas is Pasadena (Texas), United States (23 km away). In September its highs average 30.6°C, about as warm as Baytown, with 118 mm of rain.

Among the 498 cities listed in the United States, Baytown ranks joint 104th of 498 for the warmest September highs and 460th of 498 for the driest September (rainfall, lowest first). The mean September high of those 498 cities is 26.9°C; Baytown is 3.4°C warmer than that mean.

From September to October, average highs fall by 3.9°C to 26.4°C, and monthly rainfall falls from 129 mm to 109 mm.

The annual picture

September in context

30-year average

Average highAverage low°C

Monthly rainfall

Average total · mm

Averages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated

Every month, side by side

Baytown climate table

1991–2020

Monthly climate averages for Baytown, 1991–2020
Month	Average highHigh / low	Average low	Rainfall mm/month	Rain days ≥1 mm/day	Daylight hours/dayDaylight h/day
January	16.6°C7.8°C	7.8°C	109	10.0	10.510 h
February	18.5°C9.7°C	9.7°C	87	9.0	11.111 h
March	21.6°C12.9°C	12.9°C	99	9.6	12.012 h
April	25.0°C16.3°C	16.3°C	98	8.9	12.913 h
May	28.6°C20.7°C	20.7°C	96	10.4	13.614 h
June	31.2°C23.8°C	23.8°C	120	14.2	14.014 h
July	32.2°C24.6°C	24.6°C	99	13.9	13.914 h
August	32.6°C24.6°C	24.6°C	113	14.5	13.213 h
September, selected	30.3°C22.2°C	22.2°C	129	12.5	12.412 h
October	26.4°C17.6°C	17.6°C	109	8.9	11.511 h
November	21.2°C12.4°C	12.4°C	109	8.7	10.711 h
December	17.6°C9.0°C	9.0°C	110	10.0	10.310 h

Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.

Compare places

September in nearby cities

Distance from Baytown

Read the numbers correctly

Climate, not a promise.

These patterns help compare months. They cannot tell you the weather on a specific day of your trip.

Sources, method and limits

How these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Baytown) is explained once on the Baytown year overview and on the Sources, method and limits page.