Calumpit's weather is characterized by a relatively consistent temperature throughout the year, with no distinct seasonal extremes. Daytime temperatures can soar up to 40°C in March and April, while nighttime temperatures remain around 20-25°C during the same months. The temperature range decreases slightly from May to October, but remains warm, with highs reaching mid-30s Celsius. June is an anomaly, with cooler temperatures due to increased humidity. Overall, the town experiences a tropical climate with little seasonal variation.