S
M
T
W
T
F
S
30
88°
67°
31
88°
68°
1
86°
66°
2
87°
66°
3
86°
67°
4
87°
67°
5
87°
67°
6
87°
68°
7
Hist. Avg.
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8
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9
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10
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11
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12
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13
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14
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15
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16
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17
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18
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19
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20
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21
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22
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23
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24
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25
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26
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27
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28
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29
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30
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1
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2
Hist. Avg.
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3
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Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Middlesex
Middlesex's September 2026 forecast shows daily high temperatures ranging from 86° to 88°, with overnight lows between 66° and 68°. The average high for September is 87° with an average low of 67°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how September weather will actually feel in Middlesex. See also: October | November | December.
