Climate Insights for Bay City

The climate in Bay City is warm and mild. The average annual temperature is 22°C and approximately 1230mm of precipitation falls per year. Bay City receives a notable amount of rainfall throughout the year, including during its driest month. Bay City is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: August, July, June. The coldest months are January, February, December, when temperatures can drop to 9°C.

Temperatures in Bay City vary considerably across the year, with a 25°C difference between the coldest and warmest months. The warmest month is August, when average highs reach 34°C and the mean temperature sits around 29°C. January is the coolest month, with minimum temperatures around 9°C and an average of 13°C. On average, daily temperatures fluctuate by about 9°C between overnight lows and afternoon highs. The sharpest temperature change occurs between October and November, with a 5°C shift in average temperatures.

Bay City is a fairly wet location, receiving approximately 1230mm of precipitation annually, which averages out to around 103mm per month. The wettest month is May, averaging 139mm of rainfall. September and June also tend to see above-average precipitation. The driest month is February, with just 47mm. That's 92mm less than May, the wettest month. Precipitation varies noticeably between seasons, with the second half (July to December) of the year generally seeing more rainfall.

Bay City is mildly breezy, with an average annual wind speed of 17km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is April, averaging 20km/h, noticeable enough to affect lighter outdoor activities. The calmest conditions occur in September, with average winds dropping to 14km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 6km/h gap between the calmest and windiest months. Wind tends to be stronger during winter months, driven by seasonal pressure systems. The seasonal averages break down to 19km/h in winter, 20km/h in spring, 16km/h in summer, 16km/h in autumn.

It is currently spring in Bay City, which began on March 20, 2026. Bay City is in the Northern Hemisphere, where spring begins in March, summer in June, autumn in September, and winter in December. The warmest period peaks in August at around 34°C, while the coldest stretch bottoms out in January near 9°C. Summer is next, beginning on June 21, 2026 — 87 days from now.

The best time to visit Bay City is during February, March, April, October, November and December, when the weather is most comfortable for travellers. During these months, average temperatures hover around 19°C with modest rainfall averaging 78mm per month. By contrast, August can be uncomfortably hot with highs reaching 34°C, while January is the coldest period with lows dropping to 9°C. Despite being the best months overall, some rain is still likely — pack a waterproof layer and plan a mix of indoor and outdoor activities.

The table below shows monthly climate averages for Bay City based on historical weather data. Min and max temperatures represent typical overnight lows and afternoon highs for each month, shown in degrees Celsius (°C). Precipitation is measured in millimetres (mm) and indicates the average total rainfall per month. Wind speed is the average sustained speed in kilometres per hour (km/h). All values are based on averages from over 10 years of historical weather data. The current month is highlighted for quick reference.