Weather Summary for September 2000
Updated: October 9th, 2000.

Tables | Graphs

Warm and humid, with above average monthly precipitation of 7.31 inches. Showers were recorded on 22 of the 30 days in September but most were short-lived. We still had plenty of sunshine with 13 days with 9 or more hours of sunshine. Hurricane Florence brushed by in the middle of the month but didn't cause any damage.

The month began with high pressure extending over Bermuda, giving plenty of sunshine with just a few light isolated showers for the first few days. The high pressure began to retreat eastward ahead of a front approaching from the northwest coupled with an area of disturbed weather to the southeast. This resulted in increased shower activity especially on the 7th and 8th. The front lingered over the area with showers and thunderstorms on the 10th and 11th that dropped almost 2 inches of precipitation on the 10th and ΒΌ inch on the 11th. A daily record low temperature of 71 was recorded in a heavy shower on the 10th.

Tropical Storm Florence formed 430nm to the west-southwest of Bermuda on the 11th and remained stationary for a few days. Moist tropical air continued to give isolated showers in the marine area and one or two showers over Bermuda. By the 15th Florence was approaching, bringing mostly cloudy and showery conditions. The closest point of approach of Florence was approximately 60 nautical miles to the northwest at 3am on the 16th. Although Florence was a hurricane as it moved past, Bermuda only experienced tropical storm force winds for a number of hours and there were few reports of any wind or wave damage. It became mostly sunny by mid-morning as Florence moved rapidly away from the island.

The next five days were dry with plenty of sunshine as high pressure again dominated the local weather. By the 23rd another front had neared the island and a very slow moving shower persisted for about 3 hours and produced 1.69 inches of precipitation. The September rainfall had now exceeded the 50 year average of 5.10 inches.

The last week of the month had unsettled weather caused by converging troughs and moist tropical air moving up from the south, resulting in isolated showers and occasional thunderstorms on the 25th, 27th and 28th. Isaac approached from the east-southeast during this week, but passed over 430 nautical miles to the east on Friday the 29th and had no impact on local weather other than some swells outside the reef. A frontal system close-by brought a windy overcast end to the month with extended periods of rain on the 30th.

Tropical weather activity increased in September with a further 7 named storms, Ernesto, Florence, Gordon, Helena, Isaac, Joyce and Keith. All but Ernesto and Helene later became hurricanes.

Tables
 

TEMPERATURE
 FAHRENHEITCELSIUSDATE
Mean Maximum84.829.3 
Mean Minimum74.723.7 
Mean Monthly79.826.6 
Absolute Maximum86.630.31st, 18th
Absolute Minimum70.821.616th

RELATIVE HUMIDITY
 PERCENTDATE
Mean Daily Maximum91 
Mean Daily Minimum72 
Mean Monthly82 
Absolute Maximum10010th
Absolute Minimum562nd

RAINFALL
 INCHES
Total Monthly Amount7.31
Number of Rain Days21

PRECIPITATION (Inches)
(TRACE IS NOT INCLUDED IN TOTALS)

DAYAMOUNTDAYAMOUNT
1st0.0216th0.06
3rd0.0617th0.49
4th0.0623rd1.69
5th0.1224th0.02
6th0.1325th0.03
7th0.3926th0.02
8th0.4127th0.45
9th0.0228th0.38
10th1.7829th0.03
11th0.2230th0.42
14th0.04  
15st0.47  
  TOTAL:7.31

    

SEA TEMPERATURE
 FAHRENHEITCELSIUS
Maximum83.728.7
Minimum80.727.1
Mean81.627.6

BAROMETRIC PRESSURE
 INCHEShPaDATE
Maximum30.231023.618th & 19th
Minimum29.621002.916th
Mean30.051017.5 

PEAK WIND
  DATE
Max Gust (Kts)50 
Degrees True17015th

MAXIMUM MEAN WIND
  DATE
Max Mean (Kts)38 
Degrees True18016th

DAYS WITH THUNDER
4th,5th,10th,11th,28th
 
Total: 5

SUNSHINE DURATION (Hours)
Mean7.0
Maximum11.9
Total210.8

Graphs

[Daily Temperatures]

[Daily Rainfall]

[Daily Sunshine Hours]

Data Source: The Bermuda Weather Service